Hierarchical roughness makes superhydrophobic states stable
Hierarchical roughness makes superhydrophobic states stable
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DOI：
10.1016/j.mee.2006.10.054
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发表时间：
2007-03-01
影响因子：
2.3
通讯作者：
Bhushan, Bharat
中科院分区：
文献类型：
--
作者：
Nosonovsky, Michael;Bhushan, Bharat
粗糙度增强固体表面的疏水性，导致与水的高接触角。为了实现低接触角滞后沿着高接触角，超疏水表面应形成复合界面（0），其中在凸体之间的谷中具有气穴。CI通常是不稳定的，并且可以不可逆地转化为均匀界面。我们制定了稳定性标准，确定机制，导致不稳定的CI，并表明这些机制是规模依赖的。为了有效地抵抗这些尺度依赖机制，需要多尺度（分层）粗糙度。这种多尺度粗糙度在天然和人造超疏水表面中发现。(c)2006，Elsevier B.V.保留所有权利。
Roughness enhances hydrophobicity of a solid surface leading to high contact angles with water. To achieve low contact angle hysteresis along with a high contact angle, superhydrophobic surfaces should form composite interface (0) with air pockets in the valleys between asperities. The CI is often unstable and can be irreversibly transformed into the homogeneous interface. We formulate stability criterion, identify mechanisms, which lead to destabilization of the CI, and show that these mechanisms are scale-dependent. To effectively resist these scale-dependent mechanisms, a multiscale (hierarchical) roughness is required. Such multiscale roughness is found in natural and artificial superhydrophobic surfaces. (c) 2006, Elsevier B.V. All rights reserved.