Critical ageing of hydroxyapatite sol-gel solutions

被引：98
|
作者：
Chai, CS [1 ]
Gross, KA [1 ]
Ben-Nissan, B [1 ]
机构：
[1] Univ Technol Sydney, Dept Chem Mat & Forens Sci, Sydney, NSW 2007, Australia
来源：
BIOMATERIALS | 1998年 / 19卷 / 24期
关键词：
hydroxyapatite; ageing; sol-gel; coating;
D O I：
10.1016/S0142-9612(98)90138-7
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
It has been established that hydroxyapatite coatings can be produced using an alkoxide based sol-gel technique. Previous work showed that in addition to hydroxyapatite other phases including CaO were observed. A critical factor in determining the composition of the final coating is the period between solution preparation and coating deposition. The current study addresses how the ageing time affects the composition of the coating and the time required before a solution can be used to deposit monophasic coatings. Powders and coatings were produced with ageing times up to one week and examined with X-ray diffraction, thermal gravimetric analysis and differential thermal analysis. By depositing coatings after various ageing times, it was found that a solution ageing time of at least 1 day was required before monophasic hydroxyapatite coatings could be deposited. Thermogravimetric analysis showed that heating of the gel in air or in nitrogen both produced hydroxyapatite. Thermogravimetric analysis could be used as a simple and effective tool for identifying the critical ageing time required to produce high-purity hydroxyapatite coatings. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：2291 / 2296
页数：6
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