Pre-conditioning and dual constant composition dissolution kinetics of pulsed laser deposited hydroxyapatite thin films on silicon substrates.
Pre-conditioning and dual constant composition dissolution kinetics of pulsed laser deposited hydroxyapatite thin films on silicon substrates.
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DOI：
10.1016/0142-9612(96)88714-x
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发表时间：
1996-03
期刊：
影响因子：
14
通讯作者：
B. E. Tucker;C. M. Cottell;R.C.Y. Auyeungt;M. Spector;G. H. Nancollas
中科院分区：
文献类型：
--
作者：
B. E. Tucker;C. M. Cottell;R.C.Y. Auyeungt;M. Spector;G. H. Nancollas
采用双常数组成法测定了脉冲激光沉积羟基磷灰石晶体和非晶态薄膜在37℃、pH值6.5条件下在硅基体上的溶解动力学。脉冲激光沉积薄膜的溶液（0.15 m NaCl）在达到平衡后，相对于羟基磷灰石仍保持不饱和或略微过饱和，这表明只有很小的涂层释放，表面没有再沉淀。在预处理过程中，非晶态薄膜比晶态薄膜释放出更多的钙和磷酸盐。随着膜结晶度的增加，双恒组分溶解速率降低。用人的牙齿作为激光靶制备了溶解速率最低的薄膜（约为羟基磷灰石粉末靶沉积的晶体薄膜的六分之一）。在预处理过程中，等离子喷涂膜比脉冲激光沉积膜释放出更多的钙和磷酸盐，且双恒成分溶解速率更高。
The kinetics of dissolution of pulsed laser deposited crystalline and amorphous thin films of hydroxyapatite on silicon substrates were measured at 37 °C and a pH value of 6.5 using the dual constant composition method. Solutions in which the pulsed laser deposited films were preconditioned (0.15 m NaCl) remained undersaturated or slightly supersaturated with respect to hydroxyapatite after equilibrium was reached, indicating only a very small coating release and the absence of re-precipitation on the surfaces. The amorphous films released more calcium and phosphate during pre-conditioning than the more crystalline films. Dual constant composition dissolution rates decreased as film crystallinity increased. The film with the lowest dissolution rate (approximately one sixth that of a crystalline film deposited using a hydroxyapatite powder target) was fabricated using a human tooth as the laser target. During pre-conditioning of plasma-sprayed coatings, more calcium and phosphate were released than for pulsed laser deposited films, and dual constant composition dissolution rates were much higher.