Ban Seiji, Iwaya Yukari, Kono Hiroshi, Sato Hideo
Department of Biomaterials Science, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
Dent Mater. 2006 Dec;22(12):1115-20. doi: 10.1016/j.dental.2005.09.007. Epub 2005 Dec 20.
The purpose of this study was to characterize the etching behavior of titanium in concentrated sulfuric acid and discuss its application on surface modification of titanium for biological use.
Commercially pure titanium (cpTi) plate was etched in 48% H2SO4 at RT -90 degrees C for 0.25-8 h. The weight loss was derived from the weight differences before and after etching. The surfaces after etching were characterized by surface roughness, X-ray diffractometry, and scannning electron spectroscopy. The apparent activation energy of the dissolution of cpTi into acid was derived from an Arrhenius plot of the rate of weight loss versus the acid temperature.
The surface roughness of cpTi increased with the acid temperature and etching time. The surface roughness was strongly related to the weight loss. The weight loss increased drastically with the acid temperature after an initial period, which shortened with increasing acid temperature. The apparent activation energy for the dissolution of cpTi in H2SO4 was derived as 67.8 kJ/mol.
This study indicates that etching with concentrated sulfuric acid is an effective way to modify the surface of titanium for biological applications.
本研究旨在表征钛在浓硫酸中的蚀刻行为，并探讨其在钛生物用途表面改性方面的应用。
将商业纯钛（cpTi）板在48%硫酸中于室温至90摄氏度蚀刻0.25至8小时。重量损失由蚀刻前后的重量差异得出。蚀刻后的表面通过表面粗糙度、X射线衍射和扫描电子光谱进行表征。cpTi在酸中溶解的表观活化能由重量损失速率与酸温度的阿仑尼乌斯图得出。
cpTi的表面粗糙度随酸温度和蚀刻时间增加。表面粗糙度与重量损失密切相关。经过初始阶段后，重量损失随酸温度急剧增加，且随着酸温度升高该阶段缩短。cpTi在硫酸中溶解的表观活化能为67.8 kJ/mol。
本研究表明，用浓硫酸蚀刻是对钛表面进行生物应用改性的有效方法。
