纳米钛膜表面的化学特征和亲水性研究

Study of chemical characteristics and water affinity on nano-granule titanium film surface

目的构建4级纳米钛膜实验模型并研究其表面化学特征和亲水性。方法采用直流磁控溅射法通过温度控制制备不同粒度的纳米颗粒钛膜,并用X射线光电子能谱分析常温组,100、250和380℃组以及对照组样品的表面化学元素及其质量分数,静态水接触角测试其表面的亲水性能。结果所有样本表面均存在着钛、氧和碳元素,且含量基本相同,仅对照组和380℃组的氧和碳元素百分率差异有统计学意义。水接触角测试显示,对照组接触角最小,与其他各组的差异有统计学意义;常温组的接触角较100℃组大且差异有统计学意义,与其他各组间差异无统计学意义。结论各组间纳米钛膜表面化学元素的种类和含量基本相同。纳米钛膜表面的亲水性差异主要由其形貌差异引起,因为钛基底形貌的特殊性导致镀膜组纳米钛膜表面的亲水性小于未镀膜组。

Objective To construct four nano-granule titanium film models and investigate their surface chemical characteristics and water affinities.Methods Different titanium films were prepared under temperatures control by direct current magnetron sputtering.Surface chemical elements and their mass fractions of samples in ambient group,100 ℃ group,250 ℃ group and 380 ℃ group were investigated by X-ray photoelectron spectroscopy（XPS） and their water affinities were measured by stable contact angle tests respectively.Results The elements of titanium,oxygen and carbon were detected on all samples with approximate contents.The differences of percentage content on oxygen and carbon were significant between control group and 380 ℃ group.There were significant differences of contact angles between control group and all other groups by water contact angles tests with the minimum contact angle in control group.No statistical difference of contact angles existed between ambient group and all other groups but with 100 ℃ group.A larger angle showed in ambient group.Conclusion In this study,nano-granule titanium film models in all groups shared the similar chemical compositions and contents.The differences of water affinity mainly came from superficial topography variation.The specificity of titanium substrate would cause poorer water affinities in filmed groups than that in control group.