TY  - JOUR
AU  - Radmanović, Svjetlana
AU  - Marković, Mirjana M.
AU  - Jovanović, Uroš D.
AU  - Gajić-Kvascev, Maja D.
AU  - Čokeša, Djuro M.
AU  - Lilić, Jasmina A.
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5393
AB  - Part of Cu post flotation tailings of Serbia ZiJin Bor Copper, Serbia, was reclaimed by restoration of top soil with arable soils, and revegetation in 1991. Humic acids isolated from these Technosols were investigated to find out if their properties underwent any changes since reclamation. Two groups of control samples were used. Elemental composition (CHNS analysis) falls within the range of average soil humic acids. Humic acids belong to the type B pointing out to its lower humification degree (UV-Vis). Relative abundances of functional groups are ranged as follows: polysaccharide C >= aromatic C > carboxyl C > OH group > aliphatic C. Aromaticity indexes are low, 1.883.25 (ATR-FTIR). Basic units at pH 10 are in the 11.7-26.8 nm range. Pronounced reaggregation (1462--5218 nm) at pH 3 points out to less expressed humic acid sol stability, as well as to increase in aromatic condensation degree (dynamic light scattering). No significant changes have occurred in technosol humic acids since the recultivation, confirming stability of their properties over time (PCA). Nevertheless, humic acids from very strongly acidic Technosols show higher humifycation degree possibly originating from arable soils used in reclamation, but more likely from low soil pH and low litter input, results of unsuccessful reclamation.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Properties of humic acids from copper tailings 20 years after reclamation
EP  - 419
IS  - 3
SP  - 407
VL  - 85
DO  - 10.2298/JSC190717112R
ER  - 

@article{
author = "Radmanović, Svjetlana and Marković, Mirjana M. and Jovanović, Uroš D. and Gajić-Kvascev, Maja D. and Čokeša, Djuro M. and Lilić, Jasmina A.",
year = "2020",
abstract = "Part of Cu post flotation tailings of Serbia ZiJin Bor Copper, Serbia, was reclaimed by restoration of top soil with arable soils, and revegetation in 1991. Humic acids isolated from these Technosols were investigated to find out if their properties underwent any changes since reclamation. Two groups of control samples were used. Elemental composition (CHNS analysis) falls within the range of average soil humic acids. Humic acids belong to the type B pointing out to its lower humification degree (UV-Vis). Relative abundances of functional groups are ranged as follows: polysaccharide C >= aromatic C > carboxyl C > OH group > aliphatic C. Aromaticity indexes are low, 1.883.25 (ATR-FTIR). Basic units at pH 10 are in the 11.7-26.8 nm range. Pronounced reaggregation (1462--5218 nm) at pH 3 points out to less expressed humic acid sol stability, as well as to increase in aromatic condensation degree (dynamic light scattering). No significant changes have occurred in technosol humic acids since the recultivation, confirming stability of their properties over time (PCA). Nevertheless, humic acids from very strongly acidic Technosols show higher humifycation degree possibly originating from arable soils used in reclamation, but more likely from low soil pH and low litter input, results of unsuccessful reclamation.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Properties of humic acids from copper tailings 20 years after reclamation",
pages = "419-407",
number = "3",
volume = "85",
doi = "10.2298/JSC190717112R"
}

Radmanović, S., Marković, M. M., Jovanović, U. D., Gajić-Kvascev, M. D., Čokeša, D. M.,& Lilić, J. A.. (2020). Properties of humic acids from copper tailings 20 years after reclamation. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 85(3), 407-419.
https://doi.org/10.2298/JSC190717112R

Radmanović S, Marković MM, Jovanović UD, Gajić-Kvascev MD, Čokeša DM, Lilić JA. Properties of humic acids from copper tailings 20 years after reclamation. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2020;85(3):407-419.
doi:10.2298/JSC190717112R .

Radmanović, Svjetlana, Marković, Mirjana M., Jovanović, Uroš D., Gajić-Kvascev, Maja D., Čokeša, Djuro M., Lilić, Jasmina A., "Properties of humic acids from copper tailings 20 years after reclamation" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 85, no. 3 (2020):407-419,
https://doi.org/10.2298/JSC190717112R . .

TY  - CONF
AU  - Vukčević, Mira
AU  - Bošković, Ivana
AU  - Nenadović, Snežana S.
AU  - Mirković, Miljana M.
AU  - Gulicovski, Jelena
AU  - Pavlović, Vladimir
AU  - Kljajević, Ljiljana M.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/7004
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5750
AB  - Hybrid geopolymers represent a new class of composite materials formed by incorporating organic polymer into a geopolymer matrix. The properties of hybrid geopolymer depend on the addition of organic phase and the starting raw material composition (concentration of NaOH in alkaline activator, Si/Al mass ratio and solid/liquid mass ratio). In addition to these relevant parameters, this paper examines the synthesis conditions of these materials through the influence of the type, amount and manner of adding organic modifiers (commercial epoxy resins and 3- (methoxyl) propyl methacrylates) on forming the structure with significantly reduced pore distribution and decreased pore size, which exhibits good mechanical properties. The purpose of this research is to define the optimal conditions of the hybrid geopolymers' synthesis through the examination of relevant parameters. Expected improvement of mechanical properties was confirmed through values of compressive stength. Characterization of hybrid geopolymer composities was performed by XRD analysis, DRIFT spectroscopy and SEM analysis.
PB  - Belgrade : Institute for Multidisciplinary Research
C3  - Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
T1  - The potential of hybrid geopolymer composites
EP  - 71
SP  - 71
UR  - https://hdl.handle.net/21.15107/rcub_dais_7004
ER  - 

@conference{
author = "Vukčević, Mira and Bošković, Ivana and Nenadović, Snežana S. and Mirković, Miljana M. and Gulicovski, Jelena and Pavlović, Vladimir and Kljajević, Ljiljana M.",
year = "2019",
abstract = "Hybrid geopolymers represent a new class of composite materials formed by incorporating organic polymer into a geopolymer matrix. The properties of hybrid geopolymer depend on the addition of organic phase and the starting raw material composition (concentration of NaOH in alkaline activator, Si/Al mass ratio and solid/liquid mass ratio). In addition to these relevant parameters, this paper examines the synthesis conditions of these materials through the influence of the type, amount and manner of adding organic modifiers (commercial epoxy resins and 3- (methoxyl) propyl methacrylates) on forming the structure with significantly reduced pore distribution and decreased pore size, which exhibits good mechanical properties. The purpose of this research is to define the optimal conditions of the hybrid geopolymers' synthesis through the examination of relevant parameters. Expected improvement of mechanical properties was confirmed through values of compressive stength. Characterization of hybrid geopolymer composities was performed by XRD analysis, DRIFT spectroscopy and SEM analysis.",
publisher = "Belgrade : Institute for Multidisciplinary Research",
journal = "Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia",
title = "The potential of hybrid geopolymer composites",
pages = "71-71",
url = "https://hdl.handle.net/21.15107/rcub_dais_7004"
}

Vukčević, M., Bošković, I., Nenadović, S. S., Mirković, M. M., Gulicovski, J., Pavlović, V.,& Kljajević, L. M.. (2019). The potential of hybrid geopolymer composites. in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia
Belgrade : Institute for Multidisciplinary Research., 71-71.
https://hdl.handle.net/21.15107/rcub_dais_7004

Vukčević M, Bošković I, Nenadović SS, Mirković MM, Gulicovski J, Pavlović V, Kljajević LM. The potential of hybrid geopolymer composites. in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia. 2019;:71-71.
https://hdl.handle.net/21.15107/rcub_dais_7004 .

Vukčević, Mira, Bošković, Ivana, Nenadović, Snežana S., Mirković, Miljana M., Gulicovski, Jelena, Pavlović, Vladimir, Kljajević, Ljiljana M., "The potential of hybrid geopolymer composites" in Programme and the Book of Abstracts / 5th Conference of The Serbian Society for Ceramic Materials, 5CSCS-2019, June 11-13, 2019, Belgrade, Serbia (2019):71-71,
https://hdl.handle.net/21.15107/rcub_dais_7004 .

TY  - CONF
AU  - Ivanović, Marija D.
AU  - Đukić, Dunja
AU  - Mladenović, Nataša
AU  - Kljajević, Ljiljana M.
AU  - Pavlović, Vladimir
AU  - Nenadović, Snežana S.
AU  - Mirković, Miljana M.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6965
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5746
AB  - In order to optimize process of geopolymerization, the investigation of thermodynamic parameters of alkali activators are important. The aim of this research was to investigate the influence of thermodynamic parameters (density, viscosity, refractive index and sound velocity) of alkaline activators on mechanical properties (compressive strength and hardness) of synthesized geopolymer samples. Geopolymers were synthetized by alkaline activation of metakaolin, having the density 2.524 g/cm3, using the activators at elevated temperature of 60 oC for two days. Based on the obtained results thermodynamic properties has been selected to predict the properties of materials. Four series of alkaline activators have been used. Activators remarked as AA1, AA2, AA3 and AA4 present the mixtures of Na2SiO3 and solutions of NaOH, of different molarities 2M, 4M, 6M and 8M respectively. The volume ratio of Na2SiO3 and aqueous solution of NaOH was the same for all samples. Densities, viscosities and refractive indices of alkaline activators were determined over the temperature range 15-60 oC of process of geopolymerizations. The values of density, viscosity and refractive index decrease with temperature increase over the investigated temperature range. Increasing molarity of alkali activator solutions, the sound velocity of activators is changed. For sample AA2 the values of sound velocity rises from room temperature to 45 °C and then begins to decrease while for the sample AA3 sound velocity grows until 30 °C and then starts to decrease with further increasing of temperature. Four series of geopolymer samples GP1 to GP4 were synthesiyed using the constant ratio of solid and liquid phase. FTIR, XRD, SEM-EDS methods were used for physicochemical further characterization of geopolymer samples.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
T1  - The influence of thermodynamic parameters of the alkaline activator on the mechanical properties of geopolymers
EP  - 87
SP  - 87
UR  - https://hdl.handle.net/21.15107/rcub_dais_6965
ER  - 

@conference{
author = "Ivanović, Marija D. and Đukić, Dunja and Mladenović, Nataša and Kljajević, Ljiljana M. and Pavlović, Vladimir and Nenadović, Snežana S. and Mirković, Miljana M.",
year = "2019",
abstract = "In order to optimize process of geopolymerization, the investigation of thermodynamic parameters of alkali activators are important. The aim of this research was to investigate the influence of thermodynamic parameters (density, viscosity, refractive index and sound velocity) of alkaline activators on mechanical properties (compressive strength and hardness) of synthesized geopolymer samples. Geopolymers were synthetized by alkaline activation of metakaolin, having the density 2.524 g/cm3, using the activators at elevated temperature of 60 oC for two days. Based on the obtained results thermodynamic properties has been selected to predict the properties of materials. Four series of alkaline activators have been used. Activators remarked as AA1, AA2, AA3 and AA4 present the mixtures of Na2SiO3 and solutions of NaOH, of different molarities 2M, 4M, 6M and 8M respectively. The volume ratio of Na2SiO3 and aqueous solution of NaOH was the same for all samples. Densities, viscosities and refractive indices of alkaline activators were determined over the temperature range 15-60 oC of process of geopolymerizations. The values of density, viscosity and refractive index decrease with temperature increase over the investigated temperature range. Increasing molarity of alkali activator solutions, the sound velocity of activators is changed. For sample AA2 the values of sound velocity rises from room temperature to 45 °C and then begins to decrease while for the sample AA3 sound velocity grows until 30 °C and then starts to decrease with further increasing of temperature. Four series of geopolymer samples GP1 to GP4 were synthesiyed using the constant ratio of solid and liquid phase. FTIR, XRD, SEM-EDS methods were used for physicochemical further characterization of geopolymer samples.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia",
title = "The influence of thermodynamic parameters of the alkaline activator on the mechanical properties of geopolymers",
pages = "87-87",
url = "https://hdl.handle.net/21.15107/rcub_dais_6965"
}

Ivanović, M. D., Đukić, D., Mladenović, N., Kljajević, L. M., Pavlović, V., Nenadović, S. S.,& Mirković, M. M.. (2019). The influence of thermodynamic parameters of the alkaline activator on the mechanical properties of geopolymers. in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 87-87.
https://hdl.handle.net/21.15107/rcub_dais_6965

Ivanović MD, Đukić D, Mladenović N, Kljajević LM, Pavlović V, Nenadović SS, Mirković MM. The influence of thermodynamic parameters of the alkaline activator on the mechanical properties of geopolymers. in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia. 2019;:87-87.
https://hdl.handle.net/21.15107/rcub_dais_6965 .

Ivanović, Marija D., Đukić, Dunja, Mladenović, Nataša, Kljajević, Ljiljana M., Pavlović, Vladimir, Nenadović, Snežana S., Mirković, Miljana M., "The influence of thermodynamic parameters of the alkaline activator on the mechanical properties of geopolymers" in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia (2019):87-87,
https://hdl.handle.net/21.15107/rcub_dais_6965 .

TY  - CONF
AU  - Đukić, Dunja
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
AU  - Pavlović, Vladimir
AU  - Ivanović, Marija D.
AU  - Nenadović, Miloš T.
AU  - Mirković, Miljana M.
PY  - 2019
UR  - http://dais.sanu.ac.rs/123456789/6964
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5747
AB  - In a field of green chemistry, environmental protection and ecological conservation of the environment there are ways to come up with new and more advanced materials using on the one hand natural, recyceled or waste materials and on the other hand syntethic materials obtained by using green chemistry synthesis procedures. The aim of this paper was to synthesize and characterize Brushite-metakaolin-based geopolymer materials and to examine the possibility of using these materials in the fields of construction, cement industry, as well as in environmental protection as potential adsorbents. Initial materials which were used for geopolymer synthesis was Brushite (CaHPO4·2H2O) which was obtained by solutionprecipitation reaction form acetate solutions and Kaolinite clay from Rudovci deposit (Serbia). The obtained mixture powders were dissolved in a strong alcaline solution with addiction of water glass. Produced geopolymers was cast into mods and preserved for 28 days. The starting materials and the synthesized Brushite-metakaolin-based geopolymer material were examined using XRPD, FTIR SEM-EDS methods. The contact angle measurements were made to test hydrophilic and wettable properties of synthesized material.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
T1  - Synthesis and characterization of Brushite-metakaolin-based geopolymer materials
EP  - 86
SP  - 86
UR  - https://hdl.handle.net/21.15107/rcub_dais_6964
ER  - 

@conference{
author = "Đukić, Dunja and Nenadović, Snežana S. and Kljajević, Ljiljana M. and Pavlović, Vladimir and Ivanović, Marija D. and Nenadović, Miloš T. and Mirković, Miljana M.",
year = "2019",
abstract = "In a field of green chemistry, environmental protection and ecological conservation of the environment there are ways to come up with new and more advanced materials using on the one hand natural, recyceled or waste materials and on the other hand syntethic materials obtained by using green chemistry synthesis procedures. The aim of this paper was to synthesize and characterize Brushite-metakaolin-based geopolymer materials and to examine the possibility of using these materials in the fields of construction, cement industry, as well as in environmental protection as potential adsorbents. Initial materials which were used for geopolymer synthesis was Brushite (CaHPO4·2H2O) which was obtained by solutionprecipitation reaction form acetate solutions and Kaolinite clay from Rudovci deposit (Serbia). The obtained mixture powders were dissolved in a strong alcaline solution with addiction of water glass. Produced geopolymers was cast into mods and preserved for 28 days. The starting materials and the synthesized Brushite-metakaolin-based geopolymer material were examined using XRPD, FTIR SEM-EDS methods. The contact angle measurements were made to test hydrophilic and wettable properties of synthesized material.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia",
title = "Synthesis and characterization of Brushite-metakaolin-based geopolymer materials",
pages = "86-86",
url = "https://hdl.handle.net/21.15107/rcub_dais_6964"
}

Đukić, D., Nenadović, S. S., Kljajević, L. M., Pavlović, V., Ivanović, M. D., Nenadović, M. T.,& Mirković, M. M.. (2019). Synthesis and characterization of Brushite-metakaolin-based geopolymer materials. in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 86-86.
https://hdl.handle.net/21.15107/rcub_dais_6964

Đukić D, Nenadović SS, Kljajević LM, Pavlović V, Ivanović MD, Nenadović MT, Mirković MM. Synthesis and characterization of Brushite-metakaolin-based geopolymer materials. in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia. 2019;:86-86.
https://hdl.handle.net/21.15107/rcub_dais_6964 .

Đukić, Dunja, Nenadović, Snežana S., Kljajević, Ljiljana M., Pavlović, Vladimir, Ivanović, Marija D., Nenadović, Miloš T., Mirković, Miljana M., "Synthesis and characterization of Brushite-metakaolin-based geopolymer materials" in Program and the Book of abstracts / Eighteenth Young Researchers' Conference Materials Sciences and Engineering, December 4-6, 2019, Belgrade, Serbia (2019):86-86,
https://hdl.handle.net/21.15107/rcub_dais_6964 .

TY  - JOUR
AU  - Tomić, Milos
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Trifković, Kata
AU  - Stanković, Nadezda
AU  - Pavlović, Vladimir
AU  - Bajat, Jelena
AU  - Djonlagić, Jasna
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5068
AB  - In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite (R) Na+) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites
EP  - 321
SP  - 311
VL  - 131
DO  - 10.1016/j.porgcoat.2019.02.037
ER  - 

@article{
author = "Tomić, Milos and Dunjić, Branko and Nikolić, Marija S. and Trifković, Kata and Stanković, Nadezda and Pavlović, Vladimir and Bajat, Jelena and Djonlagić, Jasna",
year = "2019",
abstract = "In the present study the commercial multifunctional fatty acid polyamidoamine (PAA) was for the first time simultaneously applied as a curing agent and clay modifier for epoxy/clay nanocomposites (NC) based on diglycidyl ether of bisphenol A. The montmorillonite (Cloisite (R) Na+) was modified with different quantities of partially and fully protonated polyamidoamine. The NCs with 0.5 wt% novel organoclay were prepared by solution intercalation method. The major aims of this paper are investigations of the effects of the composition of PAA modified clays on structure, mechanical, barrier properties and corrosion stability on steel substrates of NCs were studied. The thermogravimetric, flame photometry and X-ray diffraction analyses confirmed the efficient modification of clay surface with polyamidoamine, predominantly located within layers. The NCs exhibited an intercalated/exfoliated morphology and the presence of free amino groups and increased content of modifier facilitated dispersion of clay particles within the polymer matrix, as shown by electron microscopy techniques (SEM, TEM). Under an optimized loading of PAA (molar quantity of total amino groups per clay cation exchange capacity of 1.75), the layers in stacks were separated by 5.0 nm and high number of individual layers was present in NC. Clay modified by PAA with free amino groups showed increased storage modulus in the rubbery state, glass transition temperature of NCs, while dumping factor was decreased. The tensile test confirmed that introduction of flexible modifier on the epoxy/clay interface lead to increase in the ultimate tensile strenght and elongation at break by 31% and toughness up to 83%. The electrochemical impedance spectroscopy and permeability tests proved the pronounced barrier effect of clay particles against corrosive species and water vapor when high dispersion degree of clay in NC was achieved.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites",
pages = "321-311",
volume = "131",
doi = "10.1016/j.porgcoat.2019.02.037"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Trifković, K., Stanković, N., Pavlović, V., Bajat, J.,& Djonlagić, J.. (2019). Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 131, 311-321.
https://doi.org/10.1016/j.porgcoat.2019.02.037

Tomić M, Dunjić B, Nikolić MS, Trifković K, Stanković N, Pavlović V, Bajat J, Djonlagić J. Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites. in Progress in Organic Coatings. 2019;131:311-321.
doi:10.1016/j.porgcoat.2019.02.037 .

Tomić, Milos, Dunjić, Branko, Nikolić, Marija S., Trifković, Kata, Stanković, Nadezda, Pavlović, Vladimir, Bajat, Jelena, Djonlagić, Jasna, "Polyamidoamine as a clay modifier and curing agent in preparation of epoxy nanocomposites" in Progress in Organic Coatings, 131 (2019):311-321,
https://doi.org/10.1016/j.porgcoat.2019.02.037 . .

TY  - JOUR
AU  - Kljajević, Ljiljana M.
AU  - Melichova, Z.
AU  - Stojmenović, M.D.
AU  - Todorović, B.Z.
AU  - Pavlović, Vladimir
AU  - Čitaković, N.M.
AU  - Nenadović, Snežana S.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5148
AB  - Geopolymers (GP) were successfully synthesized from metabentonite (MB), metadiatomite (MD) and metakaolinite (MK). Characterization of their phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. A SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel, and it is significantly different from the micrographs of the other two geopolymer samples, GPMB and GPMK. A considerable amount of unreacted particles, as well as the presence of pores in the geopolymer matrix of GPMK and GPMD, indicate an incomplete reaction in the system. Aluminosilicate inorganic polymers, geopolymers, are quasi solid electrolytes which possess a high electrical conductivity at room temperature in relation to materials of similar chemical composi-tion. The highest conductivity was found for the sample obtained from GPMK, amounting to 2.14 x 10-2 Ω-1cm-1 at 700 oC. The corresponding activation energies of conductivity for this sample amounted to 0.33 eV in the temperature range of 500-700 oC. The geopolymer synthesized from metakaolin has good ionic conductivity values, which recommends it for use as an alternative material for an SOFC (Solid Ox-ide Fuel Cell).
PB  - Macedonian Journal of Chemistry and Chemical Engineering
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)
EP  - 292
IS  - 2
SP  - 283
VL  - 38
DO  - 10.20450/mjcce.2019.1678
ER  - 

@article{
author = "Kljajević, Ljiljana M. and Melichova, Z. and Stojmenović, M.D. and Todorović, B.Z. and Pavlović, Vladimir and Čitaković, N.M. and Nenadović, Snežana S.",
year = "2019",
abstract = "Geopolymers (GP) were successfully synthesized from metabentonite (MB), metadiatomite (MD) and metakaolinite (MK). Characterization of their phase structure and microstructure was performed by XRD, FTIR, SEM/EDX methods. A SEM micrograph of GPMD shows a homogeneous surface with some longitudinal cavities in the gel, and it is significantly different from the micrographs of the other two geopolymer samples, GPMB and GPMK. A considerable amount of unreacted particles, as well as the presence of pores in the geopolymer matrix of GPMK and GPMD, indicate an incomplete reaction in the system. Aluminosilicate inorganic polymers, geopolymers, are quasi solid electrolytes which possess a high electrical conductivity at room temperature in relation to materials of similar chemical composi-tion. The highest conductivity was found for the sample obtained from GPMK, amounting to 2.14 x 10-2 Ω-1cm-1 at 700 oC. The corresponding activation energies of conductivity for this sample amounted to 0.33 eV in the temperature range of 500-700 oC. The geopolymer synthesized from metakaolin has good ionic conductivity values, which recommends it for use as an alternative material for an SOFC (Solid Ox-ide Fuel Cell).",
publisher = "Macedonian Journal of Chemistry and Chemical Engineering",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)",
pages = "292-283",
number = "2",
volume = "38",
doi = "10.20450/mjcce.2019.1678"
}

Kljajević, L. M., Melichova, Z., Stojmenović, M.D., Todorović, B.Z., Pavlović, V., Čitaković, N.M.,& Nenadović, S. S.. (2019). Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite). in Macedonian Journal of Chemistry and Chemical Engineering
Macedonian Journal of Chemistry and Chemical Engineering., 38(2), 283-292.
https://doi.org/10.20450/mjcce.2019.1678

Kljajević LM, Melichova Z, Stojmenović M, Todorović B, Pavlović V, Čitaković N, Nenadović SS. Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite). in Macedonian Journal of Chemistry and Chemical Engineering. 2019;38(2):283-292.
doi:10.20450/mjcce.2019.1678 .

Kljajević, Ljiljana M., Melichova, Z., Stojmenović, M.D., Todorović, B.Z., Pavlović, Vladimir, Čitaković, N.M., Nenadović, Snežana S., "Structural and electrical properties of geopolymer materials based on different precursors (kaolin, bentonite and diatomite)" in Macedonian Journal of Chemistry and Chemical Engineering, 38, no. 2 (2019):283-292,
https://doi.org/10.20450/mjcce.2019.1678 . .

TY  - CONF
AU  - Ivanović, Marija
AU  - Kljajević, Ljiljana M.
AU  - Gulicovski, Jelena
AU  - Todorović, Bratislav Ž.
AU  - Egelja, Adela
AU  - Pavlović, Vladimir B.
AU  - Nenadović, Snežana S.
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/3630
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5724
AB  - The goal of this research was to produce an environmental friendly, energy saving inorganic polymer using a metakaolin as a precursor. The clean technology which conserve the natural environment was employed for the production of these materials. The used kaolinite is clay obtained from Rudovci, Lazarevac, Serbia. Physicochemical properties of kaolin were investigated in previous work by Nenadović et al. [1]. Metakaolin (MK) was prepared by calcining kaolinite at 750 °C for 1 h. The influence of alkali activation, i.e. different concentration of NaOH as a component of alkali activator mixture on the process of polymerization of metakaolin is investigated. The alkaline solution was prepared from sodium silicate and 2M, 4M, 6M and 8 M NaOH (analytical grade) (volume ratio Na2SiO3/NaOH = 1.6). The inorganic polymer (IP) samples were formed from metakaolin and the four different alkaline solution (solid/liquid ratio was about 1), which were mixed for 15 min and then left at room temperature for one day. Finally, the mixture was kept in a sample drying oven for 2 days at 60 °C. Process of aging time of inorganic polymer samples at 7th, 14th, 21st and 28th days is followed by some analytical methods (XRD, FTIR). X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) were used for characterization of metakaolin and metakaolin based inorganic polymers. After 28th days when the aging time were finished, on the surface of the samples were used scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). XRD analysis almost of all inorganic polymer samples revealed their amorphouslike structure with the position of an amorphous halo in the range 18°-32°, which indicates short range ordering of the reference sample with crystalline admixture of SiO2 (α-quartz, ICSD 89). The FTIR spectra of all samples shows a strong peak at ∼1000 cm−1 which is associated with Si–O–Si asymmetric stretching vibrations and is the finger print of the geopolymerization [2,3]. The FT-IR results show a shift of the Si-O or Si-O-X bands as the molarity of activator increasing during polymerization process, where X can be Si or Al. Both methods and XRD, as well as FTIR, show greater sensitivity to monitoring the effects of molarity, than the aging time within the same molarity to structural changes in inorganic polymer. SEM micrographs (Fig.1) showed a denser matrix, and a lower content of unreacted metakaolin particles due to increasing of molarity of NaOH. Structural reorganization of inorganic polymer samples occurs during the curing or aging in accordance with a polymerization mechanism.
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
T1  - The Effect of Alkaline Activator Molarity and Aging Time on the Structure of Inorganic Polymer
EP  - 206
SP  - 204
UR  - https://hdl.handle.net/21.15107/rcub_dais_3630
ER  - 

@conference{
author = "Ivanović, Marija and Kljajević, Ljiljana M. and Gulicovski, Jelena and Todorović, Bratislav Ž. and Egelja, Adela and Pavlović, Vladimir B. and Nenadović, Snežana S.",
year = "2018",
abstract = "The goal of this research was to produce an environmental friendly, energy saving inorganic polymer using a metakaolin as a precursor. The clean technology which conserve the natural environment was employed for the production of these materials. The used kaolinite is clay obtained from Rudovci, Lazarevac, Serbia. Physicochemical properties of kaolin were investigated in previous work by Nenadović et al. [1]. Metakaolin (MK) was prepared by calcining kaolinite at 750 °C for 1 h. The influence of alkali activation, i.e. different concentration of NaOH as a component of alkali activator mixture on the process of polymerization of metakaolin is investigated. The alkaline solution was prepared from sodium silicate and 2M, 4M, 6M and 8 M NaOH (analytical grade) (volume ratio Na2SiO3/NaOH = 1.6). The inorganic polymer (IP) samples were formed from metakaolin and the four different alkaline solution (solid/liquid ratio was about 1), which were mixed for 15 min and then left at room temperature for one day. Finally, the mixture was kept in a sample drying oven for 2 days at 60 °C. Process of aging time of inorganic polymer samples at 7th, 14th, 21st and 28th days is followed by some analytical methods (XRD, FTIR). X-ray diffraction (XRD) and Fourier transformation infrared spectroscopy (FTIR) were used for characterization of metakaolin and metakaolin based inorganic polymers. After 28th days when the aging time were finished, on the surface of the samples were used scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS). XRD analysis almost of all inorganic polymer samples revealed their amorphouslike structure with the position of an amorphous halo in the range 18°-32°, which indicates short range ordering of the reference sample with crystalline admixture of SiO2 (α-quartz, ICSD 89). The FTIR spectra of all samples shows a strong peak at ∼1000 cm−1 which is associated with Si–O–Si asymmetric stretching vibrations and is the finger print of the geopolymerization [2,3]. The FT-IR results show a shift of the Si-O or Si-O-X bands as the molarity of activator increasing during polymerization process, where X can be Si or Al. Both methods and XRD, as well as FTIR, show greater sensitivity to monitoring the effects of molarity, than the aging time within the same molarity to structural changes in inorganic polymer. SEM micrographs (Fig.1) showed a denser matrix, and a lower content of unreacted metakaolin particles due to increasing of molarity of NaOH. Structural reorganization of inorganic polymer samples occurs during the curing or aging in accordance with a polymerization mechanism.",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia",
title = "The Effect of Alkaline Activator Molarity and Aging Time on the Structure of Inorganic Polymer",
pages = "206-204",
url = "https://hdl.handle.net/21.15107/rcub_dais_3630"
}

Ivanović, M., Kljajević, L. M., Gulicovski, J., Todorović, B. Ž., Egelja, A., Pavlović, V. B.,& Nenadović, S. S.. (2018). The Effect of Alkaline Activator Molarity and Aging Time on the Structure of Inorganic Polymer. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia
Belgrade : Serbian Academy of Sciences and Arts., 204-206.
https://hdl.handle.net/21.15107/rcub_dais_3630

Ivanović M, Kljajević LM, Gulicovski J, Todorović BŽ, Egelja A, Pavlović VB, Nenadović SS. The Effect of Alkaline Activator Molarity and Aging Time on the Structure of Inorganic Polymer. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia. 2018;:204-206.
https://hdl.handle.net/21.15107/rcub_dais_3630 .

Ivanović, Marija, Kljajević, Ljiljana M., Gulicovski, Jelena, Todorović, Bratislav Ž., Egelja, Adela, Pavlović, Vladimir B., Nenadović, Snežana S., "The Effect of Alkaline Activator Molarity and Aging Time on the Structure of Inorganic Polymer" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia (2018):204-206,
https://hdl.handle.net/21.15107/rcub_dais_3630 .

TY  - CONF
AU  - Ivanović, Marija
AU  - Mladenović, Nataša
AU  - Gulicovski, Jelena
AU  - Pavlović, Vladimir B.
AU  - Pavlović, Vera P.
AU  - Kljajević, Ljiljana M.
AU  - Nenadović, Snežana S.
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4116
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5732
AB  - Considering geopolymers as inorganic polymers, they are actually amorphous network of interlinked silicate and aluminate groups, so they could be prospective ceramic precursors for materials with defined dimensions obtained by casting and firing, but not from powder processing. In this research, the starting material is metakaolin, which was obtained by calcining domes tic kaolinite clay. Initially, four series of alkaline activators of NaOH and sodium silicate have been used. Activators present the mixtures of Na2SiO3 and solutions of NaOH, of different molarities 2M, 4M, 6M and 8M. The prepared geopolymer slurries were cast into the designated near shape at room temperature and after that at 60oC. In fact, the post-synthesis curing process (28 days) has an important role in the obtaining good characteristics of geopolymers. Densities, viscosities and refractive index of alkaline activators were determined over the temperature range 15-60oC of process of geopolymerizations. Based on the obtained results of investigated parameters have been selected to predict the properties of materials. All geopolymer samples were characterized by XRD, FTIR, SEM/EDS analysis and Raman spectroscopy providing complementary and valuable information of the investigated materials. This route of ceramics production has advantages associated with producing an environmental friendly, energy saving, clean new technology of geopolymer materials.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 17-19 September 2018
T1  - Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples
EP  - 74
SP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_dais_4116
ER  - 

@conference{
author = "Ivanović, Marija and Mladenović, Nataša and Gulicovski, Jelena and Pavlović, Vladimir B. and Pavlović, Vera P. and Kljajević, Ljiljana M. and Nenadović, Snežana S.",
year = "2018",
abstract = "Considering geopolymers as inorganic polymers, they are actually amorphous network of interlinked silicate and aluminate groups, so they could be prospective ceramic precursors for materials with defined dimensions obtained by casting and firing, but not from powder processing. In this research, the starting material is metakaolin, which was obtained by calcining domes tic kaolinite clay. Initially, four series of alkaline activators of NaOH and sodium silicate have been used. Activators present the mixtures of Na2SiO3 and solutions of NaOH, of different molarities 2M, 4M, 6M and 8M. The prepared geopolymer slurries were cast into the designated near shape at room temperature and after that at 60oC. In fact, the post-synthesis curing process (28 days) has an important role in the obtaining good characteristics of geopolymers. Densities, viscosities and refractive index of alkaline activators were determined over the temperature range 15-60oC of process of geopolymerizations. Based on the obtained results of investigated parameters have been selected to predict the properties of materials. All geopolymer samples were characterized by XRD, FTIR, SEM/EDS analysis and Raman spectroscopy providing complementary and valuable information of the investigated materials. This route of ceramics production has advantages associated with producing an environmental friendly, energy saving, clean new technology of geopolymer materials.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 17-19 September 2018",
title = "Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples",
pages = "74-73",
url = "https://hdl.handle.net/21.15107/rcub_dais_4116"
}

Ivanović, M., Mladenović, N., Gulicovski, J., Pavlović, V. B., Pavlović, V. P., Kljajević, L. M.,& Nenadović, S. S.. (2018). Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples. in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 17-19 September 2018
Belgrade : Serbian Ceramic Society., 73-74.
https://hdl.handle.net/21.15107/rcub_dais_4116

Ivanović M, Mladenović N, Gulicovski J, Pavlović VB, Pavlović VP, Kljajević LM, Nenadović SS. Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples. in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 17-19 September 2018. 2018;:73-74.
https://hdl.handle.net/21.15107/rcub_dais_4116 .

Ivanović, Marija, Mladenović, Nataša, Gulicovski, Jelena, Pavlović, Vladimir B., Pavlović, Vera P., Kljajević, Ljiljana M., Nenadović, Snežana S., "Effect of Alkaline Activator Properties on Structure of Metakaolin-Based Geopolymer Samples" in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VII : New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, 17-19 September 2018 (2018):73-74,
https://hdl.handle.net/21.15107/rcub_dais_4116 .

TY  - JOUR
AU  - Tomić, Milog
AU  - Dunjić, Branko
AU  - Nikolić, Marija S.
AU  - Maletaskić, Jelena
AU  - Pavlović, Vladimir
AU  - Bajat, Jelena
AU  - Djonlagić, Jasna
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4750
AB  - The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G', G", of Mt/epoxy dispersions and glassy storage modulus, Young's modulus and barrier properties of cured CPN.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods
EP  - 63
SP  - 52
VL  - 154
DO  - 10.1016/j.clay.2017.12.047
ER  - 

@article{
author = "Tomić, Milog and Dunjić, Branko and Nikolić, Marija S. and Maletaskić, Jelena and Pavlović, Vladimir and Bajat, Jelena and Djonlagić, Jasna",
year = "2018",
abstract = "The major aims of this paper are the investigation of the effects of the mixing procedure and the montmorillonite (Mt) surface modification on the structure (optical microscopy, XRD, TEM, SEM), rheological, mechanical properties (DMA, tensile test) and corrosion stability (electrochemical impedance spectroscopy) of clay mineral/epoxy nanocomposite (CPN). Two series of CPN samples were prepared based on diglycidyl ether of bisphenol A (DGEBA) and polyamidoamine curing agent with three organophilic Mt and sodium-montmorillonite (1 wt%). Mt were mixed with DGEBA solution in the powder (direct mixing) and in the form of dispersions, preswollen in a commercial coating thinner (solution intercalation). The commercial Mt (Cloisite 30B) modified by quaternary alkylammonium ions bearing hydroxyl groups and especially Mt functionalized by primary (HDA(+)-Mt) alkylammonium ions, at loadings close to cation exchange capacity (CRC), were significantly swollen by thinner and further uniformly dispersed into CPN. Meanwhile, low gel volumes in thinner were found for more hydrophobic Mt (Cloisite 15A). The compatibility of Mt with solvents was well described by solubility and Flory-Huggins interaction parameters. In contrast to the direct incorporation of Mt powders in CPN, swelling enhanced intercalation of epoxy matrix into Mt, and for HDA(+)-Mt based CPN interlayer spacing reached 4.4 nm. The usage of HDA(+)-Mt organoclay and solution intercalation procedure provided the highest enhancement in rheological parameters (G', G", of Mt/epoxy dispersions and glassy storage modulus, Young's modulus and barrier properties of cured CPN.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods",
pages = "63-52",
volume = "154",
doi = "10.1016/j.clay.2017.12.047"
}

Tomić, M., Dunjić, B., Nikolić, M. S., Maletaskić, J., Pavlović, V., Bajat, J.,& Djonlagić, J.. (2018). Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 154, 52-63.
https://doi.org/10.1016/j.clay.2017.12.047

Tomić M, Dunjić B, Nikolić MS, Maletaskić J, Pavlović V, Bajat J, Djonlagić J. Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods. in Applied Clay Science. 2018;154:52-63.
doi:10.1016/j.clay.2017.12.047 .

Tomić, Milog, Dunjić, Branko, Nikolić, Marija S., Maletaskić, Jelena, Pavlović, Vladimir, Bajat, Jelena, Djonlagić, Jasna, "Dispersion efficiency of montmorillonites in epoxy nanocomposites using solution intercalation and direct mixing methods" in Applied Clay Science, 154 (2018):52-63,
https://doi.org/10.1016/j.clay.2017.12.047 . .

TY  - JOUR
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
AU  - Nesić, Maja A.
AU  - Petković, Marijana Z.
AU  - Trivunac, Katarina V.
AU  - Pavlović, Vladimir
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4365
AB  - The paper presents chemical and structural analysis of geopolymer materials which are obtained by alkali-activated calcined clay (metakaolin) originated from Serbia under strictly defined conditions. Characterization of the metakaolin and geopolymers molecular structure has been done using X-ray diffraction, scanning electron microscope, Fourier transform infrared spectroscopy and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. The paper presents the possibility of obtaining geopolymer structure and differences in chemical and structural characterization of these materials taking into account the concentration of NaOH as a variable parameter. The results of MALDI analysis of metakaolin and synthesized geopolymer structures using various matrix system: 2,4,6 trihydroxyacetophenone (THAP), alpha-cyano-4-hydroxycinnamic, 2,6 dihydroxyacetophenone and laser desorption/ionization, have shown that THAP matrix is the most appropriate for analysing these aluminosilicate materials.
PB  - Springer, New York
T2  - Environmental Earth Sciences
T1  - Structure analysis of geopolymers synthesized from clay originated from Serbia
IS  - 2
VL  - 76
DO  - 10.1007/s12665-016-6360-4
ER  - 

@article{
author = "Nenadović, Snežana S. and Kljajević, Ljiljana M. and Nesić, Maja A. and Petković, Marijana Z. and Trivunac, Katarina V. and Pavlović, Vladimir",
year = "2017",
abstract = "The paper presents chemical and structural analysis of geopolymer materials which are obtained by alkali-activated calcined clay (metakaolin) originated from Serbia under strictly defined conditions. Characterization of the metakaolin and geopolymers molecular structure has been done using X-ray diffraction, scanning electron microscope, Fourier transform infrared spectroscopy and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. The paper presents the possibility of obtaining geopolymer structure and differences in chemical and structural characterization of these materials taking into account the concentration of NaOH as a variable parameter. The results of MALDI analysis of metakaolin and synthesized geopolymer structures using various matrix system: 2,4,6 trihydroxyacetophenone (THAP), alpha-cyano-4-hydroxycinnamic, 2,6 dihydroxyacetophenone and laser desorption/ionization, have shown that THAP matrix is the most appropriate for analysing these aluminosilicate materials.",
publisher = "Springer, New York",
journal = "Environmental Earth Sciences",
title = "Structure analysis of geopolymers synthesized from clay originated from Serbia",
number = "2",
volume = "76",
doi = "10.1007/s12665-016-6360-4"
}

Nenadović, S. S., Kljajević, L. M., Nesić, M. A., Petković, M. Z., Trivunac, K. V.,& Pavlović, V.. (2017). Structure analysis of geopolymers synthesized from clay originated from Serbia. in Environmental Earth Sciences
Springer, New York., 76(2).
https://doi.org/10.1007/s12665-016-6360-4

Nenadović SS, Kljajević LM, Nesić MA, Petković MZ, Trivunac KV, Pavlović V. Structure analysis of geopolymers synthesized from clay originated from Serbia. in Environmental Earth Sciences. 2017;76(2).
doi:10.1007/s12665-016-6360-4 .

Nenadović, Snežana S., Kljajević, Ljiljana M., Nesić, Maja A., Petković, Marijana Z., Trivunac, Katarina V., Pavlović, Vladimir, "Structure analysis of geopolymers synthesized from clay originated from Serbia" in Environmental Earth Sciences, 76, no. 2 (2017),
https://doi.org/10.1007/s12665-016-6360-4 . .

TY  - JOUR
AU  - Kljajević, Ljiljana M.
AU  - Nenadović, Snežana S.
AU  - Nenadović, Miloš
AU  - Bundaleski, Nenad K.
AU  - Todorović, Bratislav Z.
AU  - Pavlović, Vladimir
AU  - Rakocević, Zlatko Lj.
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4356
AB  - This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 degrees C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGp:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 degrees C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containing alumino-silicate phases are created. The thermal treatment at 900 degrees C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 degrees C.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Structural and chemical properties of thermally treated geopolymer samples
EP  - 6708
IS  - 9
SP  - 6700
VL  - 43
DO  - 10.1016/j.ceramint.2017.02.066
ER  - 

@article{
author = "Kljajević, Ljiljana M. and Nenadović, Snežana S. and Nenadović, Miloš and Bundaleski, Nenad K. and Todorović, Bratislav Z. and Pavlović, Vladimir and Rakocević, Zlatko Lj.",
year = "2017",
abstract = "This article presents the results of the compositional, structural and morphological study of geopolymers synthesized from metakaolin and an alkali activator. The study involved the investigation of the structural and chemical properties of the geopolymer, in addition to thermally treated geopolymers up to 600 and 900 degrees C. The precursor of the geopolymer, and the geopolymer samples before and after the thermal treatment, were investigated by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and SEM analysis. The corrected average value of the ratio of silicon and aluminum in the geopolymer samples (SiGp:Al) is about 1.46, which suggests that the obtained geopolymer samples represent a mixture of roughly equal amounts of sialate and sialate-siloxo units. Annealing the geopolymer samples at 600 degrees C decreases the amount of Si-ONa bonds and induces the cross-linking of polymer changes. At the same time, other sodium containing alumino-silicate phases are created. The thermal treatment at 900 degrees C leads to a considerable reduction of oxygen and particularly sodium, followed by significant morphological changes i.e. formation of a complex porous structure. Additionally, a new semicrystaline phase appears. Both XRD and XPS results imply that this new phase may be nepheline and it is plausible that this phase begins to nucleate at temperatures below 900 degrees C.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Structural and chemical properties of thermally treated geopolymer samples",
pages = "6708-6700",
number = "9",
volume = "43",
doi = "10.1016/j.ceramint.2017.02.066"
}

Kljajević, L. M., Nenadović, S. S., Nenadović, M., Bundaleski, N. K., Todorović, B. Z., Pavlović, V.,& Rakocević, Z. Lj.. (2017). Structural and chemical properties of thermally treated geopolymer samples. in Ceramics International
Elsevier Sci Ltd, Oxford., 43(9), 6700-6708.
https://doi.org/10.1016/j.ceramint.2017.02.066

Kljajević LM, Nenadović SS, Nenadović M, Bundaleski NK, Todorović BZ, Pavlović V, Rakocević ZL. Structural and chemical properties of thermally treated geopolymer samples. in Ceramics International. 2017;43(9):6700-6708.
doi:10.1016/j.ceramint.2017.02.066 .

Kljajević, Ljiljana M., Nenadović, Snežana S., Nenadović, Miloš, Bundaleski, Nenad K., Todorović, Bratislav Z., Pavlović, Vladimir, Rakocević, Zlatko Lj., "Structural and chemical properties of thermally treated geopolymer samples" in Ceramics International, 43, no. 9 (2017):6700-6708,
https://doi.org/10.1016/j.ceramint.2017.02.066 . .

TY  - JOUR
AU  - Nenadović, Snežana S.
AU  - Kljajević, Ljiljana M.
AU  - Seslak, Bojan Z.
AU  - Obradović, Nina
AU  - Vukanac, Ivana S.
AU  - Pavlović, Vladimir
PY  - 2014
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3426
AB  - The aim of this study was to investigate the Cs+ ions sorption on natural minerals clinoptilolite. The analysis of clinoptilolite and clinoptilolite with adsorbed Cs+ ion was conducted by X-ray diffraction, scanning electron microscopy, X-ray fluorescence, and gamma spectrometry. The specific activity of naturally occurring radionuclides in clinoptilolite was determined by gamma spectrometry by using the HPGe semiconductor detector. Obtained activity concentrations ranged from 49 Bq/kg to 810 Bq/kg for K-40, 5.7 Bq/kg to 10 Bq/kg for U-238, 5.8 Bq/kg to 70 Bq/kg for Th-232(Ac-228), and the presence of artificial radionuclides was not detected (Cs-137  lt  0.02 Bq/kg). The study of the thermal decomposition of raw clinoptilolite and Cs adsorbed clinoptilolite by differential thermal analysis is presented in this paper. The activation energy of the reaction phase transformation of raw clinoptilolite is 156.7 kJ/mol, while Cs adsorbed clinoptilolite is 121.7 kJ/mol. The lower value of activation energy reaction of the phase transformation Cs adsorbed clinoptilolite indicates that Cs which is adsorbed destabilizes the crystal structure of clinoptilolite and thus facilitates the transition to the amorphous state.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Nuclear Technology & Radiation Protection
T1  - Cesium removal from aqueous solution by natural mineral clinoptilolite
EP  - 141
IS  - 2
SP  - 135
VL  - 29
DO  - 10.2298/NTRP1402135N
ER  - 

@article{
author = "Nenadović, Snežana S. and Kljajević, Ljiljana M. and Seslak, Bojan Z. and Obradović, Nina and Vukanac, Ivana S. and Pavlović, Vladimir",
year = "2014",
abstract = "The aim of this study was to investigate the Cs+ ions sorption on natural minerals clinoptilolite. The analysis of clinoptilolite and clinoptilolite with adsorbed Cs+ ion was conducted by X-ray diffraction, scanning electron microscopy, X-ray fluorescence, and gamma spectrometry. The specific activity of naturally occurring radionuclides in clinoptilolite was determined by gamma spectrometry by using the HPGe semiconductor detector. Obtained activity concentrations ranged from 49 Bq/kg to 810 Bq/kg for K-40, 5.7 Bq/kg to 10 Bq/kg for U-238, 5.8 Bq/kg to 70 Bq/kg for Th-232(Ac-228), and the presence of artificial radionuclides was not detected (Cs-137  lt  0.02 Bq/kg). The study of the thermal decomposition of raw clinoptilolite and Cs adsorbed clinoptilolite by differential thermal analysis is presented in this paper. The activation energy of the reaction phase transformation of raw clinoptilolite is 156.7 kJ/mol, while Cs adsorbed clinoptilolite is 121.7 kJ/mol. The lower value of activation energy reaction of the phase transformation Cs adsorbed clinoptilolite indicates that Cs which is adsorbed destabilizes the crystal structure of clinoptilolite and thus facilitates the transition to the amorphous state.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Nuclear Technology & Radiation Protection",
title = "Cesium removal from aqueous solution by natural mineral clinoptilolite",
pages = "141-135",
number = "2",
volume = "29",
doi = "10.2298/NTRP1402135N"
}

Nenadović, S. S., Kljajević, L. M., Seslak, B. Z., Obradović, N., Vukanac, I. S.,& Pavlović, V.. (2014). Cesium removal from aqueous solution by natural mineral clinoptilolite. in Nuclear Technology & Radiation Protection
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 29(2), 135-141.
https://doi.org/10.2298/NTRP1402135N

Nenadović SS, Kljajević LM, Seslak BZ, Obradović N, Vukanac IS, Pavlović V. Cesium removal from aqueous solution by natural mineral clinoptilolite. in Nuclear Technology & Radiation Protection. 2014;29(2):135-141.
doi:10.2298/NTRP1402135N .

Nenadović, Snežana S., Kljajević, Ljiljana M., Seslak, Bojan Z., Obradović, Nina, Vukanac, Ivana S., Pavlović, Vladimir, "Cesium removal from aqueous solution by natural mineral clinoptilolite" in Nuclear Technology & Radiation Protection, 29, no. 2 (2014):135-141,
https://doi.org/10.2298/NTRP1402135N . .

TY  - JOUR
AU  - Jovanović, Uroš D.
AU  - Marković, Mirjana M.
AU  - Cupać, Svjetlana
AU  - Tomić, Zorica
PY  - 2013
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3093
AB  - Humic acids (HAs), similar to other fractions of humic substances (HSs), have a large number of reactive functional groups enabling them to aggregate in solutions. Regardless of the origin of humic acid (aqueous or soil), this aggregation process is dependent on environmental conditions and strongly influences the mobility of soluble ionic and molecular pollutants. The aim of this work was to monitor the aggregation process of two humic acids isolated from different mineral soils (IHSS Elliot soil HA standard and Rendzic Leptosol HA) in the 2-11 pH range. Changes in aggregate size in HA sols were followed up using dynamic light scattering (DLS), while zeta potential (ZP) measurements in the same pH range were performed applying laser Doppler electrophoresis (LDE) technique. The effect of HA sol concentration and soil source on aggregation was examined as well. Besides, HA samples were characterized using Fourier transform infrared (FT-IR) spectroscopy. By inspecting HA-particle-size dependence on pH, it can be concluded that both HAs in corresponding sols behave as molecular aggregates or supramolecular structures, formed from small individual moieties (sizes  lt  10 nm) at higher pH values. The ZP vs. pH curve for both HAs revealed the ZP minimum in the 5-7 pH range, caused most likely by dissociation of acidic functional groups prevailing at lower pH values and deaggregation predominating over dissociation at higher pH values.
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Journal of Plant Nutrition and Soil Science
T1  - Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis
EP  - 679
IS  - 5
SP  - 674
VL  - 176
DO  - 10.1002/jpln.201200346
ER  - 

@article{
author = "Jovanović, Uroš D. and Marković, Mirjana M. and Cupać, Svjetlana and Tomić, Zorica",
year = "2013",
abstract = "Humic acids (HAs), similar to other fractions of humic substances (HSs), have a large number of reactive functional groups enabling them to aggregate in solutions. Regardless of the origin of humic acid (aqueous or soil), this aggregation process is dependent on environmental conditions and strongly influences the mobility of soluble ionic and molecular pollutants. The aim of this work was to monitor the aggregation process of two humic acids isolated from different mineral soils (IHSS Elliot soil HA standard and Rendzic Leptosol HA) in the 2-11 pH range. Changes in aggregate size in HA sols were followed up using dynamic light scattering (DLS), while zeta potential (ZP) measurements in the same pH range were performed applying laser Doppler electrophoresis (LDE) technique. The effect of HA sol concentration and soil source on aggregation was examined as well. Besides, HA samples were characterized using Fourier transform infrared (FT-IR) spectroscopy. By inspecting HA-particle-size dependence on pH, it can be concluded that both HAs in corresponding sols behave as molecular aggregates or supramolecular structures, formed from small individual moieties (sizes  lt  10 nm) at higher pH values. The ZP vs. pH curve for both HAs revealed the ZP minimum in the 5-7 pH range, caused most likely by dissociation of acidic functional groups prevailing at lower pH values and deaggregation predominating over dissociation at higher pH values.",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Journal of Plant Nutrition and Soil Science",
title = "Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis",
pages = "679-674",
number = "5",
volume = "176",
doi = "10.1002/jpln.201200346"
}

Jovanović, U. D., Marković, M. M., Cupać, S.,& Tomić, Z.. (2013). Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis. in Journal of Plant Nutrition and Soil Science
Wiley-V C H Verlag Gmbh, Weinheim., 176(5), 674-679.
https://doi.org/10.1002/jpln.201200346

Jovanović UD, Marković MM, Cupać S, Tomić Z. Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis. in Journal of Plant Nutrition and Soil Science. 2013;176(5):674-679.
doi:10.1002/jpln.201200346 .

Jovanović, Uroš D., Marković, Mirjana M., Cupać, Svjetlana, Tomić, Zorica, "Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis" in Journal of Plant Nutrition and Soil Science, 176, no. 5 (2013):674-679,
https://doi.org/10.1002/jpln.201200346 . .

TY  - JOUR
AU  - Purenović, J.
AU  - Mitić, V.V.
AU  - Kocić, Lj.
AU  - Pavlović, Vladimir
AU  - Randjelović, M.
AU  - Purenović, M.
PY  - 2013
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3285
AB  - Porous aluminium-silicate ceramics, modified by alloying with magnesium and microalloying with alluminium belongs to a group of advanced multifunctional ceramics materials. This multiphase solid-solid system has predominantly amorphous microstructure and micro morphology. Intergranular and interphase areas are very complex, because they represent areas, where numbered processes and interactions take place, making new boundaries and regions with fractal nature. Fractal analysis of intergranular microstructure has included determination of ceramic grain fractal dimension by using Richardson method. Considering the fractal nature of intergranular contacts, it is possible to establish correlation between material electrical properties and fractal analysis, as a tool for future correlation with microstructure characterization.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Intergranular Area Microalloyed Aluminium-silicate Ceramics Fractal Analysis
EP  - 126
IS  - 1
SP  - 117
VL  - 45
DO  - 10.2298/SOS1301117P
ER  - 

@article{
author = "Purenović, J. and Mitić, V.V. and Kocić, Lj. and Pavlović, Vladimir and Randjelović, M. and Purenović, M.",
year = "2013",
abstract = "Porous aluminium-silicate ceramics, modified by alloying with magnesium and microalloying with alluminium belongs to a group of advanced multifunctional ceramics materials. This multiphase solid-solid system has predominantly amorphous microstructure and micro morphology. Intergranular and interphase areas are very complex, because they represent areas, where numbered processes and interactions take place, making new boundaries and regions with fractal nature. Fractal analysis of intergranular microstructure has included determination of ceramic grain fractal dimension by using Richardson method. Considering the fractal nature of intergranular contacts, it is possible to establish correlation between material electrical properties and fractal analysis, as a tool for future correlation with microstructure characterization.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Intergranular Area Microalloyed Aluminium-silicate Ceramics Fractal Analysis",
pages = "126-117",
number = "1",
volume = "45",
doi = "10.2298/SOS1301117P"
}

Purenović, J., Mitić, V.V., Kocić, Lj., Pavlović, V., Randjelović, M.,& Purenović, M.. (2013). Intergranular Area Microalloyed Aluminium-silicate Ceramics Fractal Analysis. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 45(1), 117-126.
https://doi.org/10.2298/SOS1301117P

Purenović J, Mitić V, Kocić L, Pavlović V, Randjelović M, Purenović M. Intergranular Area Microalloyed Aluminium-silicate Ceramics Fractal Analysis. in Science of Sintering. 2013;45(1):117-126.
doi:10.2298/SOS1301117P .

Purenović, J., Mitić, V.V., Kocić, Lj., Pavlović, Vladimir, Randjelović, M., Purenović, M., "Intergranular Area Microalloyed Aluminium-silicate Ceramics Fractal Analysis" in Science of Sintering, 45, no. 1 (2013):117-126,
https://doi.org/10.2298/SOS1301117P . .

TY  - JOUR
AU  - Nenadović, Snežana S.
AU  - Nenadović, Miloš
AU  - Kljajević, Ljiljana M.
AU  - Vukanac, Ivana S.
AU  - Poznanović, Maja
AU  - Mihajlović-Radosavljević, Ana
AU  - Pavlović, Vladimir
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2945
AB  - In the present work, naturally occurring radionuclides U-238, Th-232 and K-40 were measured in soil samples from the cultivated and undisturbed areas in Rudovci, municipality of Lazarevac, Serbia. There were three profiles, each profile divided into four horizons, giving the twelve soil samples. The specific activity of U-238, Th-232 and K-40 in soil and sediment samples was determined by gamma spectrometry using the HPGe semiconductor detector. Obtained activity concentrations ranged from 28.0 to 44.0 Bq/kg for U-238, from 59.4 to 71.4 Bq/kg for Th-232 and from 335.0 to 517.0 Bq/kg for K-40. The evaluation of the radiological hazards originated from U-238, Th-232 and K-40 in the samples, the absorbed dose rate (D) and the annual effective dose rate (E), calculated in accordance with the UNSCEAR 2000 report, are presented in this paper.
PB  - Elsevier, Amsterdam
T2  - Science of the Total Environment
T1  - Vertical distribution of natural radionuclides in soil: Assessment of external exposure of population in cultivated and undisturbed areas
EP  - 316
SP  - 309
VL  - 429
DO  - 10.1016/j.scitotenv.2012.04.054
ER  - 

@article{
author = "Nenadović, Snežana S. and Nenadović, Miloš and Kljajević, Ljiljana M. and Vukanac, Ivana S. and Poznanović, Maja and Mihajlović-Radosavljević, Ana and Pavlović, Vladimir",
year = "2012",
abstract = "In the present work, naturally occurring radionuclides U-238, Th-232 and K-40 were measured in soil samples from the cultivated and undisturbed areas in Rudovci, municipality of Lazarevac, Serbia. There were three profiles, each profile divided into four horizons, giving the twelve soil samples. The specific activity of U-238, Th-232 and K-40 in soil and sediment samples was determined by gamma spectrometry using the HPGe semiconductor detector. Obtained activity concentrations ranged from 28.0 to 44.0 Bq/kg for U-238, from 59.4 to 71.4 Bq/kg for Th-232 and from 335.0 to 517.0 Bq/kg for K-40. The evaluation of the radiological hazards originated from U-238, Th-232 and K-40 in the samples, the absorbed dose rate (D) and the annual effective dose rate (E), calculated in accordance with the UNSCEAR 2000 report, are presented in this paper.",
publisher = "Elsevier, Amsterdam",
journal = "Science of the Total Environment",
title = "Vertical distribution of natural radionuclides in soil: Assessment of external exposure of population in cultivated and undisturbed areas",
pages = "316-309",
volume = "429",
doi = "10.1016/j.scitotenv.2012.04.054"
}

Nenadović, S. S., Nenadović, M., Kljajević, L. M., Vukanac, I. S., Poznanović, M., Mihajlović-Radosavljević, A.,& Pavlović, V.. (2012). Vertical distribution of natural radionuclides in soil: Assessment of external exposure of population in cultivated and undisturbed areas. in Science of the Total Environment
Elsevier, Amsterdam., 429, 309-316.
https://doi.org/10.1016/j.scitotenv.2012.04.054

Nenadović SS, Nenadović M, Kljajević LM, Vukanac IS, Poznanović M, Mihajlović-Radosavljević A, Pavlović V. Vertical distribution of natural radionuclides in soil: Assessment of external exposure of population in cultivated and undisturbed areas. in Science of the Total Environment. 2012;429:309-316.
doi:10.1016/j.scitotenv.2012.04.054 .

Nenadović, Snežana S., Nenadović, Miloš, Kljajević, Ljiljana M., Vukanac, Ivana S., Poznanović, Maja, Mihajlović-Radosavljević, Ana, Pavlović, Vladimir, "Vertical distribution of natural radionuclides in soil: Assessment of external exposure of population in cultivated and undisturbed areas" in Science of the Total Environment, 429 (2012):309-316,
https://doi.org/10.1016/j.scitotenv.2012.04.054 . .