Modulated Monoclinic Hydroxyapatite: The Effect of pH in the Microwave Assisted Method
Autor: | Daniela Edith Salado-Leza, Maria Isabel Reyes Valderrama, Susana López-Ortíz, M. E. Fernández-García, Eleazar Salinas-Rodríguez, Daniel Sánchez-Campos, D. Mendoza-Anaya, Ventura Rodríguez-Lugo |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Materials science
lcsh:QE351-399.2 Ammonium phosphate Infrared spectroscopy 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Crystallinity pH effect Fourier transform infrared spectroscopy lcsh:Mineralogy Rietveld refinement hydroxyapatite nanorods hydroxyapatite Geology 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology monoclinic phase 0104 chemical sciences microwave hydrothermal synthesis Ammonium hydroxide chemistry Crystallite 0210 nano-technology Monoclinic crystal system Nuclear chemistry |
Zdroj: | Minerals Volume 11 Issue 3 Minerals, Vol 11, Iss 314, p 314 (2021) |
ISSN: | 2075-163X |
DOI: | 10.3390/min11030314 |
Popis: | Hydroxyapatite (HAp) is a natural hard tissue constituent widely used for bone and tooth replacement engineering. In the present work, synthetic HAp was obtained from calcium nitrate tetrahydrate (Ca(NO3)2·4H2O) and ammonium phosphate dibasic (NH4)2HPO4 following an optimized microwave assisted hydrothermal method. The effect of pH was evaluated by the addition of ammonium hydroxide (NH4OH). Hence, different characterization techniques were used to determine its influence on the resulted HAp powders’ size, shape, and crystallinity. By Transmission Electron Microscopy (TEM), it was observed that the reaction pH environment modifies the morphology of HAp, and a shape evolution, from sub-hedral particles at pH = 7 to rod-like nanosized HAp at pH = 10, was confirmed. Using the X-ray Diffraction (XRD) technique, the characteristic diffraction peaks of the monoclinic phase were identified. Even if the performed Rietveld analysis indicated the presence of both phases (hexagonal and monoclinic), monoclinic HAp prevails in 95% with an average crystallite size of about 23 nm. The infrared spectra (FTIR) showed absorption bands at 3468 cm−1 and 630 cm−1 associated with OH− of hydroxyapatite, and bands at 584 cm−1, 960 cm−1, and 1090 cm−1 that correspond to the PO43− and CO32− characteristic groups. In summary, this work contributes to obtaining nanosized rod-like monoclinic HAp by a simple and soft method that has not been previously reported. |
Databáze: | OpenAIRE |
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