Hydrophobicity of Surfaces with Cavities: Making Hydrophobic Substrates from Hydrophilic Materials?
Hydrophobicity of Surfaces with Cavities: Making Hydrophobic Substrates from Hydrophilic Materials?
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DOI：
10.1163/156856108x370073
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发表时间：
2009-01-01
影响因子：
2.3
通讯作者：
Patankar, Neelesh A.
中科院分区：
文献类型：
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作者：
Patankar, Neelesh A.
已知由疏水材料制成的粗糙表面表现出增强的疏水性。类似地，由亲水材料制成的粗糙表面显示出增加的亲水行为。这些观测结果的能量学可以用温泽尔公式或卡西-巴克斯特公式很好地解释。最近的实验结果表明，由亲水材料制成的粗糙表面可以表现出疏水行为。这个想法是使一个粗糙的表面与空腔。据报道，即使当基底材料是亲水性的时，液滴在这种表面上的表观接触角也与Cassie-Baxter公式一致。其他人认为这意味着在液滴沉积在其上之后，空气仍然被困在空腔中，从而使其有效地疏水。在这项工作中，我们考虑的有效能量的表面理论。(c)Koninklijke Brill NV，莱顿，2009年
Rough surfaces made of hydrophobic materials are known to exhibit enhanced hydrophobicity. Similarly, rough surfaces made of hydrophilic materials show increased hydrophilic behavior. The energetics of these observations is well explained by either Wenzel's or Cassie-Baxter's formulas. Recent experimental results have shown that rough surfaces made of hydrophilic materials can exhibit hydrophobic behavior. The idea is to make a rough surface with cavities. The apparent contact angle of a drop on such surfaces is reported to agree with Cassie-Baxter's formula even when the substrate material is hydrophilic. Others have interpreted this to imply that air remains trapped in the cavities after a liquid drop is deposited on it, thus making it effectively hydrophobic. In this work, we consider the effective energy of such surfaces theoretically. (c) Koninklijke Brill NV, Leiden, 2009