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[求助] 浸润性中材料表面的粗糙度R如何确定?

浸润性中材料表面的粗糙度R如何确定?
根据Wenzel模型,R is the roughness factor (the ratio between the actualand projected surface areas of the textured solids)
这个具体材料如何测定?比如纤维材料很难通过测试获得,是否有近似值可以套用?
Aizenberg在其2011 年“SLIPS”的Nature(Bioinspired self-repairing slippery surfaces with pressure-stable omniphobicity)中直接就使用的2,没说怎么测的,是不是说粗糙度很高的材料可以直接用2近似?有没有出处
对于超亲液的材料,粗糙表面的表观接触角不是稳定状态,没法通过和本征接触角对比获得粗糙度R
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