预钙化加速类骨磷灰石在镍钛合金表面生长的电化学阻抗谱(英文)  

ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF ACCELERATED BONE-LIKE APATITE GROWTH ON NICKEL AND TITANIUM ALLOY BY PRE-CALCIFICATION

作　　者：陈民芳[1,2] 崔忠波[1] 由臣[1] 杨贤金[3] 崔振铎[3] 

机构地区：[1]天津理工大学材料科学与工程学院 [2]天津大学材料科学与工程学院,天津300072 [3]天津大学材料科学与工程学院

出　　处：《硅酸盐学报》2008年第9期1231-1235,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50471048);天津市教委科技计划(20041018)资助项目

摘　　要：通过酸碱处理活化NiTi合金表面,在模拟体液中仿生生长类骨磷灰石层以改善其生物相容性。采用电化学阻抗谱研究了预钙化对加速磷灰石沉积的影响,并基于双层模型建立了电子等效电路。结果表明:随着在模拟体液中浸泡时间的延长,化学处理的NiTi合金表面类骨磷灰石不断生长,并且添加预钙化试样浸泡3 d,即可在合金表面生长出均匀完整的类骨磷灰石层,而未预钙化试样表面沉积物稀少。对应电子等效电路中,预钙化试样电阻值明显大于未预钙化试样的,显示预钙化促进了活化NiTi合金表面类骨磷灰石的生长。In order to improve its biocompatibility, a biomimetic process that treats the NiTi alloy with acid and alkali separately, and then in a simulated body fluid （SBF） was employed to deposit a bone-like apatite coating on a NiTi surface. Effect ofpre-calcification on accelerated apatite growth on the bioactive NiTi in the SBF was investigated using an electrochemical impedance spectroscopy （EIS）. The electrical equivalent circuit based on a two-layer model was proposed. The results show that bone-like apatite is continuously formed on chemically treated NiTi with increasing of immersion time in the SBF. After immersion in the SBF for 3 d, the surface of chemically treated NiTi with pre-calcification is covered with a high density of compact and uniform granules of bone-like apatite, while imperfect coating is observed on the sample surface without pre-calcification. The resistance of the apatite layer on the sample with pre-calcification is obviously higher than the one of the sample without pre-calcification, which indicates the bone-like apatite on chemically treated NiTi is promoted by the pre-calcification process.

关 键 词：类骨磷灰石涂层 镍钛合金 加速生长 预钙化 电化学阻抗谱 

分 类 号：TQ146.4[化学工程]