基于状态转换的超疏水表面滑移特性研究方法

Experimental Method Based on the Wetting State Transition to Study the Slippage of Liquid on Super-hydrophobic Surface

根据流体在大剪切速率下在超疏水表面上产生状态转换的现象,提出了通过转换后得到的参数来刻画转化前滑移特性的方法,这种方法能够去除大接触角对滑移特性测量值的影响。为验证方法的可行性,进行了水在光栅结构超疏水表面上、甘油水溶液在碳纳米管(CNTs)结构表面上以及甘油水溶液在ZnO纳米结构表面上的流变实验。结果表明:所研究的超疏水表面在大的剪切速率下产生了状态转化,而通过这种转化正好可以刻画表面的滑移特性。这种方法适合于衡量液体在超疏水表面的接触状态容易发生转换的情况。

According to the wetting state transition of liquid on super-hydrophobic surfaces under large shear rate, a novel method was proposed to characterize the slippage of super-hydrophobic surfaces ,which can remove the effect of contact angle on the slippage measurement. To verify the feasibility of this method, a series of rheology experiments were carried out on stripe super-hydrophobic surface, CNTs surface and ZnO surface. The results show that the wetting state of liquid on super-hydrophobic surfaces can transit under large shear rate and the slippage of these surfaces can be characterized by this transition. This method is only fit for the case that the wetting state transition is easy to occur in the testing course.