標題: Structural characterization of nano-sized calcium deficient apatite powders
作者: Liou, SC
Chen, SY
Lee, HY
Bow, JS
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: calcium-deficient apatites (CDHA);needle-like crystals;X-ray absorption near-edge structure (XANES);electron energy loss spectrometry (EELS);electron-energy loss near-edge structure (ELNES);stoichiometry;non-stoichiometry
公開日期: 1-Jan-2004
摘要: Nano-sized calcium-deficient apatitic (CDHA) crystals with Ca/P ratios from 1.5 to 1.67 were synthesized using wet chemical method and of needle-like shape with 5-10 nm in diameter and 40-50 nm in length was observed. The structural environment of the Ca atoms in all the CDHA nano-crystals has been investigated using EXAFS, XANES and EELS. The results reveal that a maximum Fourier transform amplitude occurs at the apatite with a Ca/P ratio of 1.67 and the structural disorder increase following the sequence of 1.67 > 1.5 > 1.6 > 1.55. A similar phenomenon is also observed in both K-edge XANES and L-2,L-3-edge ELNES in the Ca atom. The structural analysis further demonstrates that different chemical and biological properties among these CDHA nano-crystals with Ca/P ratio from 1.5 to 1.67 are primarily due to the effect of stoichiometry and non-stoichiometry as compared to the structural order-disorder. (C) 2003 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/S0142-9612(03)00479-4
http://hdl.handle.net/11536/27214
ISSN: 0142-9612
DOI: 10.1016/S0142-9612(03)00479-4
期刊: BIOMATERIALS
Volume: 25
Issue: 2
起始頁: 189
結束頁: 196
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