超疏水Ti6Al4V表面的制备及其润湿性

为了使Ti6Al4V合金具有超疏水特性,采用激光技术加工规则点阵状纹理,然后采用自组装技术在试样表面制备自组装分子膜,得到了超疏水Ti6Al4V表面.激光加工构造的微米级点阵结构规整,形成了具有一定高度的类似锥台或柱状的凸起.通过激光加工和沉积自组装分子膜,Ti6Al4V试样表面的水接触角显著增大,最大可达到151°.将测得的接触角与分别用Wenzel模型和Cassie模型计算的理论值进行比较,实测结果更接近Cassie模型的结果.通过改变激光加工表面微结构的参数,可以控制表面接触角的大小.随着表面粗糙度值的增大,接触角呈增大趋势.当表面粗糙度大于4μm时,接触角均大于150°,形成超疏水表面.

Fabrication of Superhydrophobic Surfaces on Ti6Al4V Alloy and Its Wettability

In order to fabricate superhydrophobic Ti6Al4V alloy,surface texture with regular dot array was manufactured with laser and self-assembled monolayers（SAMs） were deposited on the textured surface with self-assembled method.The micron-level space-lattice modified by laser was regular in structure and had cone-like or cylinder-like humps with a certain height on the surface.After laser modification and depositing of SAMs,the contact angles of the water droplet on the surface increased significantly,with the maximum angle of 151°.Comparisons of the measured angles with the values from Wenzel model and with those from Cassie model indicate that the measured angle accords more with that from Cassie model.Moreover,the contact angle can be controlled by changing the parameters of the micro-structure manufactured with laser modification.The contact angle tends to increase with the increment of the surface roughness.When the roughness is over 4 μm,all the contact angles are bigger than 150° and a superhydrophobic surface has been formed.