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2018 (4)

Egelja, Adela

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  • Egelja, Adela (4)
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Author's Bibliography

The Effect of Alkaline Activator Molarity and Aging Time on the Structure of Inorganic Polymer

Ivanović, Marija; Kljajević, Ljiljana M.; Gulicovski, Jelena; Todorović, Bratislav Ž.; Egelja, Adela; Pavlović, Vladimir B.; Nenadović, Snežana S.

(Belgrade : Serbian Academy of Sciences and Arts, 2018)

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
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
SP  - 204
EP  - 206
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",
url = "http://dais.sanu.ac.rs/123456789/3630",
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 = "204-206"
}
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.
Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, SerbiaBelgrade : Serbian Academy of Sciences and Arts., null, 204-206. 
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. Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructures ELMINA 2018, August 27-29, 2018, Belgrade, Serbia. 2018;:204-206

Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate

Lukić, Miodrag J.; Kuzmanović, Maja; Sezen, Meltem; Bakan, Feray; Egelja, Adela; Veselinović, Ljiljana

(2018)

TY  - JOUR
AU  - Lukić, Miodrag J.
AU  - Kuzmanović, Maja
AU  - Sezen, Meltem
AU  - Bakan, Feray
AU  - Egelja, Adela
AU  - Veselinović, Ljiljana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/3357
AB  - The present study describes sintering behaviour of hydroxyapatite (HAp) upon addition of lithium iron phosphate (LFP) (1-10 wt.%) system in inert (Ar) atmosphere. The interaction between materials and melting of LFP influenced early and intermediate stages of HAp sintering, shifting the densification curves towards low-temperature side. Analysis of densification process indicated significant differences upon LFP addition. The reaction mechanism that assumes the initial interaction between phosphates from LFP and calcium from HAp was proposed, generating calcium vacancies and contributing to HAp densification. Cross-sections of sintered samples showed changes in microstructural properties, with uniform atomic distribution and presence of Li2Fe3O4 spherical inclusions (200 nm) located at grain boundaries of calcium phosphate matrix. The Rietveld refinement analysis indicated changes in structural and microstructural parameters like crystallite size, anisotropy and microstructural strain of HAp upon LFP addition. Mechanical characterisation indicated improvements in fracture behaviour upon LFP addition.
T2  - Journal of the European Ceramic Society
T1  - Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate
SP  - 2120
EP  - 2133
VL  - 38
DO  - 10.1016/j.jeurceramsoc.2017.12.023
ER  - 
@article{
author = "Lukić, Miodrag J. and Kuzmanović, Maja and Sezen, Meltem and Bakan, Feray and Egelja, Adela and Veselinović, Ljiljana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/3357",
abstract = "The present study describes sintering behaviour of hydroxyapatite (HAp) upon addition of lithium iron phosphate (LFP) (1-10 wt.%) system in inert (Ar) atmosphere. The interaction between materials and melting of LFP influenced early and intermediate stages of HAp sintering, shifting the densification curves towards low-temperature side. Analysis of densification process indicated significant differences upon LFP addition. The reaction mechanism that assumes the initial interaction between phosphates from LFP and calcium from HAp was proposed, generating calcium vacancies and contributing to HAp densification. Cross-sections of sintered samples showed changes in microstructural properties, with uniform atomic distribution and presence of Li2Fe3O4 spherical inclusions (200 nm) located at grain boundaries of calcium phosphate matrix. The Rietveld refinement analysis indicated changes in structural and microstructural parameters like crystallite size, anisotropy and microstructural strain of HAp upon LFP addition. Mechanical characterisation indicated improvements in fracture behaviour upon LFP addition.",
journal = "Journal of the European Ceramic Society",
title = "Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate",
pages = "2120-2133",
volume = "38",
doi = "10.1016/j.jeurceramsoc.2017.12.023"
}
Lukić, M. J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A.,& Veselinović, L. (2018). Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate.
Journal of the European Ceramic Society, 38, 2120-2133. 
https://doi.org/10.1016/j.jeurceramsoc.2017.12.023
Lukić MJ, Kuzmanović M, Sezen M, Bakan F, Egelja A, Veselinović L. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society. 2018;38:2120-2133
1
1
1

Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate

Lukić, Miodrag J.; Kuzmanović, Maja; Sezen, Meltem; Bakan, Feray; Egelja, Adela; Veselinović, Ljiljana

(2018)

TY  - JOUR
AU  - Lukić, Miodrag J.
AU  - Kuzmanović, Maja
AU  - Sezen, Meltem
AU  - Bakan, Feray
AU  - Egelja, Adela
AU  - Veselinović, Ljiljana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/4924
AB  - The present study describes sintering behaviour of hydroxyapatite (HAp) upon addition of lithium iron phosphate (LFP) (1-10 wt.%) system in inert (Ar) atmosphere. The interaction between materials and melting of LFP influenced early and intermediate stages of HAp sintering, shifting the densification curves towards low-temperature side. Analysis of densification process indicated significant differences upon LFP addition. The reaction mechanism that assumes the initial interaction between phosphates from LFP and calcium from HAp was proposed, generating calcium vacancies and contributing to HAp densification. Cross-sections of sintered samples showed changes in microstructural properties, with uniform atomic distribution and presence of Li2Fe3O4 spherical inclusions (200 nm) located at grain boundaries of calcium phosphate matrix. The Rietveld refinement analysis indicated changes in structural and microstructural parameters like crystallite size, anisotropy and microstructural strain of HAp upon LFP addition. Mechanical characterisation indicated improvements in fracture behaviour upon LFP addition.
T2  - Journal of the European Ceramic Society
T1  - Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate
SP  - 2120
EP  - 2133
VL  - 38
DO  - 10.1016/j.jeurceramsoc.2017.12.023
ER  - 
@article{
author = "Lukić, Miodrag J. and Kuzmanović, Maja and Sezen, Meltem and Bakan, Feray and Egelja, Adela and Veselinović, Ljiljana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/4924",
abstract = "The present study describes sintering behaviour of hydroxyapatite (HAp) upon addition of lithium iron phosphate (LFP) (1-10 wt.%) system in inert (Ar) atmosphere. The interaction between materials and melting of LFP influenced early and intermediate stages of HAp sintering, shifting the densification curves towards low-temperature side. Analysis of densification process indicated significant differences upon LFP addition. The reaction mechanism that assumes the initial interaction between phosphates from LFP and calcium from HAp was proposed, generating calcium vacancies and contributing to HAp densification. Cross-sections of sintered samples showed changes in microstructural properties, with uniform atomic distribution and presence of Li2Fe3O4 spherical inclusions (200 nm) located at grain boundaries of calcium phosphate matrix. The Rietveld refinement analysis indicated changes in structural and microstructural parameters like crystallite size, anisotropy and microstructural strain of HAp upon LFP addition. Mechanical characterisation indicated improvements in fracture behaviour upon LFP addition.",
journal = "Journal of the European Ceramic Society",
title = "Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate",
pages = "2120-2133",
volume = "38",
doi = "10.1016/j.jeurceramsoc.2017.12.023"
}
Lukić, M. J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A.,& Veselinović, L. (2018). Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate.
Journal of the European Ceramic Society, 38, 2120-2133. 
https://doi.org/10.1016/j.jeurceramsoc.2017.12.023
Lukić MJ, Kuzmanović M, Sezen M, Bakan F, Egelja A, Veselinović L. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society. 2018;38:2120-2133
1
1
1

Supporting information for the article: Lukić, M.J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A., Veselinović, L., 2018. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society 38, 2120–2133. https://doi.org/10.1016/j.jeurceramsoc.2017.12.023

Lukić, Miodrag J.; Kuzmanović, Maja; Sezen, Meltem; Bakan, Feray; Egelja, Adela; Veselinović, Ljiljana

(2018)

TY  - BOOK
AU  - Lukić, Miodrag J.
AU  - Kuzmanović, Maja
AU  - Sezen, Meltem
AU  - Bakan, Feray
AU  - Egelja, Adela
AU  - Veselinović, Ljiljana
PY  - 2018
UR  - http://dais.sanu.ac.rs/123456789/5977
T2  - Journal of the European Ceramic Society
T1  - Supporting information for the article: Lukić, M.J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A., Veselinović, L., 2018. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society 38, 2120–2133. https://doi.org/10.1016/j.jeurceramsoc.2017.12.023
ER  - 
@misc{
author = "Lukić, Miodrag J. and Kuzmanović, Maja and Sezen, Meltem and Bakan, Feray and Egelja, Adela and Veselinović, Ljiljana",
year = "2018",
url = "http://dais.sanu.ac.rs/123456789/5977",
journal = "Journal of the European Ceramic Society",
title = "Supporting information for the article: Lukić, M.J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A., Veselinović, L., 2018. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society 38, 2120–2133. https://doi.org/10.1016/j.jeurceramsoc.2017.12.023"
}
Lukić, M. J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A.,& Veselinović, L. (2018). Supporting information for the article: Lukić, M.J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A., Veselinović, L., 2018. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society 38, 2120–2133. https://doi.org/10.1016/j.jeurceramsoc.2017.12.023.
Journal of the European Ceramic Society, null. 
Lukić MJ, Kuzmanović M, Sezen M, Bakan F, Egelja A, Veselinović L. Supporting information for the article: Lukić, M.J., Kuzmanović, M., Sezen, M., Bakan, F., Egelja, A., Veselinović, L., 2018. Inert atmosphere processing of hydroxyapatite in the presence of lithium iron phosphate. Journal of the European Ceramic Society 38, 2120–2133. https://doi.org/10.1016/j.jeurceramsoc.2017.12.023. Journal of the European Ceramic Society. 2018;