Extrand C W, Moon Sung In, Hall P, Schmidt D
Entegris Inc., 3500 Lyman Boulevard, Chaska, Minnesota 55318, USA.
Langmuir. 2007 Aug 14;23(17):8882-90. doi: 10.1021/la700816n. Epub 2007 Jul 17.
Superwetting of structured surfaces, sometimes referred to as hemi-wicking, was studied both experimentally and theoretically. Structured substrates with regular arrays of square pillars or frustra were machined from graphite blocks and then treated to render them lyophilic. Liquids spread over these surfaces to produce noncircular wetting areas. If the channels between the features were made shallower or narrower, liquids wicked more and spread over a larger area. The inherent wettability of the graphite was relatively unimportant; large differences in the contact angles had little influence on the spreading. Practically, this means that, to achieve extensive coverage, near-zero contact angles are not required. A combination of the appropriate surface structure and moderate inherent wettability can effectively flatten liquids, spreading them over very large areas.
对结构化表面的超润湿性（有时称为半芯吸作用）进行了实验和理论研究。用石墨块加工出具有规则方形柱阵列或平截头体的结构化基底，然后对其进行处理使其具有亲液性。液体在这些表面上扩散，形成非圆形的润湿区域。如果特征之间的通道变得更浅或更窄，液体的芯吸作用就会更强，并扩散到更大的区域。石墨的固有润湿性相对不太重要；接触角的巨大差异对扩散影响很小。实际上，这意味着，为了实现广泛覆盖，并不需要接近零的接触角。适当的表面结构与适度的固有润湿性相结合，可以有效地使液体变平，使其在非常大的区域上扩散开来。
