期刊
ACTA BIOMATERIALIA
卷 7, 期 7, 页码 2960-2968出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2011.03.020
关键词
Hydroxyapatite whiskers; Calcium/phosphate ratio; Initial pH; Constitution; Morphology; Hydrothermal homogeneous precipitation
资金
- Faculty of Dentistry, The University of Hong Kong
Hydrothermal homogeneous precipitation combines the best characteristics of the hydrothermal and homogeneous precipitation methods, and allows long and uniform hydroxyapatite (HA) whiskers, with a high aspect ratio and high crystallinity, to be obtained. Their morphology and structural characteristics depend on the initial Ca/P ratio (iCa/P) and pH (ipH), as well as the initial calcium concentration (i[Ca]). Variation in these values had no effect on constitution, which was crystallographically indistinguishable from HA. Ca/P ratio steadily improved with increases in both ipH and iCa/P, but was independent of i[Ca]. Uniform whiskers were obtained at high iCa/P and low ipH, or at high ipH and low iCa/P. Whiskers with a mean length of 96-140 mu m and an aspect ratio of 96-136 were obtained at ipH = 2-3 and iCa/P = 1.67-2. At a low ipH and low iCa/P, irregular plate-like particles and branch-like whiskers were formed, while a high ipH favoured the formation of lath-like HA at high iCa/P. Preferred growth along the c-axis was more intense at higher iCa/P and ipH as well as at low gal. However, under these conditions, the crystal growth habit was also changed, showing preferred growth along both the c- and a-axes. The increase in whisker width over the general value obtained was abrupt at low i[Ca] and high iCa/P. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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