结构内角对微槽表面蒸发液滴润湿状态的影响

he interior structure angle is one of the key parameter to determine the geometrical morphology of microgrooves. One of the area enclosed by the groove of hydrophobic micro-grooved surface and droplet's meniscus is studied by the criterion that the interface has the lowest interfacial Gibbs free energy per unit area is the most stable interface. The calculating equations of interfacial Gibbs free energy per unit area and ISA are deduced by two dimensional analysis. The influences of ISA on the wetting state of evaporated droplet on the hydrophobic micro-grooved surface are analyzed by the equations. From the analysis of calculating results, it is found that enlarging ISA is benefit for maintaining hydrophobic performance of the droplet, but reduce ISA is good to control the schedule and time consuming of wetting transition. Changing ISA can vary the impact trend of surface physical dimension on wetting state of droplet, for example, groove height and groove width. It is also found that changing ISA can alter the varying trend of meniscus critical curvature in the process of wetting transition.