標題: Phase development and structural characterization of calcium phosphate ceramics-polyacrylic acid nanocomposites at room temperature in water-methanol mixtures
作者: Liou, SZC
Chen, SY
Liu, DM
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 1-十二月-2004
摘要: Calcium phosphate ceramics (CPCs) were prepared via an in-situ formation in the presence of polyacrylic acid (PAA) polymer under water-methanol (WM) mixture at room temperature. The PAA polymer was employed as both structure-directing agent and crystallization retardant to manipulate the development of resulting CPCs nano-crystallites which are observed to show a core-shell configuration with a thin layer of PAA molecules. A resulting phase evolution map with respect to the developing phases of calcium-deficient hydroxyapatite (CDHA), beta-tricalcium phosphate (beta-TCP), and an intermediate amorphous calcium phoshate (ACP) that were structurally and spectroscopically identified, was constructed in terms of fractions of water-to-methanol proportions and concentration of PAA. It is found that for the solutions in both water-rich and methanol-rich regions, pure CDHA and beta-TCP instead of intermediate ACP phase can be developed irrespective of the concentration of PAA, respectively. For conditions in between, i.e., with methanol fractions of 15%-90%, ACP appeared only when the PAA fell in a limited concentration range. (C) 2004 Kluwer Academic Publishers.
URI: http://dx.doi.org/10.1007/s10856-004-5733-5
http://hdl.handle.net/11536/25602
ISSN: 0957-4530
DOI: 10.1007/s10856-004-5733-5
期刊: JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
Volume: 15
Issue: 12
起始頁: 1261
結束頁: 1266
顯示於類別:期刊論文


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