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- W2000573776 abstract "The aim of this work is to investigate the effects of thermal treatment, in the range of temperature between 80oC - 900oC, on crystallinity, morphology and particles size of calcium hydroxylapatite nanopowders (HAp). A complete study was carried out applying 31P Magic Angle Spinning NMR, X-ray diffraction, nitrogen porosimetry and Transmission Electron Microscopy techniques. HAp specimens were prepared by chemical precipitation in an aqueous solution of calcium nitrate and ammonium hydrogen phosphate. The thermal treatment performed, showed the formation of crystals whose appearance has three main morphologies and different particles size. HAp treated up to 500oC showed a set of needle-like shape crystals with a low surface area value. These crystals turned into rod-like crystals with temperature increase, along with an increase in crystallite size. At 900oC was detected a hexagonal hydroxylapatite phase. Furthermore, Dynamic Light Scattering explored a stable HAp dispersion. The isopropyl alcohol dispersion resulted stable for at least two weeks, useful to create layers of determined morphology nanoparticles." @default.
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- W2000573776 date "2012-01-01" @default.
- W2000573776 modified "2023-10-03" @default.
- W2000573776 title "Influence of Temperature on Calcium Hydroxyapatite Nanopowders" @default.
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- W2000573776 doi "https://doi.org/10.4236/anp.2012.13004" @default.
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