当液体沿固体表面的流速超过临界速度时，出现滑移，这样能实现减阻；

When the flow rate of the liquid slipping along the solid surface exceeds that of a critical speed, slipping will occur and drag reduction will be realized consequently;

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因此，寻求和制备同时含有高表面自由能和低表面自由能组分，且两种组分可以被不同溶剂选择的固体表面，是制备溶剂响应型智能表面的前提条件。

So, it is important to find and prepare a surface containing both high surface energy and low surface energy compositions, which can be selected by different solvents.

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