低温等离子体对NiTi形状记忆合金的表面改性

Surface Modification of NiTi Shape Memory Alloys by Cold-plasma Technique

在微波电子回旋共振低温等离子体条件下,用二乙二醇二甲醚为试剂对镍钛合金进行表面改性。在表面得到一层均匀、致密的固体薄膜。经过X射线光电子能谱和衰减全反射傅立叶变换红外光谱的分析和表征,发现沉积的涂层为类PEG结构,表面主要聚集大量—CH2—CH2—O键;血浆蛋白吸附实验显示,与改性前相比,等离子体沉积在镍钛合金表面的类PEG涂层能够有效抵抗蛋白质吸附。

A coating on NiTi alloys surfaces was prepared under diethylene glycol dimethyl ether (diglyme) microwave cold-plasma in electron cyclotron resonance conditions. It had been demonstrated that the coatings were uniform and closed. The chemistry of coatings was investigated by XPS and ATR-FTIR spectra characterize and analysis, which indicated that the plasma modification resulted in the deposition of thin solid polyethylene glycol (PEG)-like structures, with mainly of-CH2-CH2-O-linkages. Compared to the unmodified surfaces, the plasma-treated NiTi alloys surfaces effectively offered protein resistance.