Contact angle hysteresis of non-flattened-top micro/nanostructures.
Contact angle hysteresis of non-flattened-top micro/nanostructures.
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DOI：
10.1021/la500277n
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Sona Moradi;P. Englezos;S. Hatzikiriakos
中科院分区：
文献类型：
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作者：
Sona Moradi;P. Englezos;S. Hatzikiriakos
提出了一个二维（2D）热力学模型来预测接触角（CA）和接触角滞后（CAH）的不同类型的表面几何形状，特别是那些具有非平坦顶部的凹凸不平。通过激光烧蚀制备的微/纳正弦和抛物线图案对模型进行了评价。这些微观结构进行了分析，通过使用吉布斯自由能，以获得平衡接触角（CA）和接触角滞后（CAH）。两种类型的微结构的几何细节上最大化的纳米图案化的表面的超疏水性的影响也进行了讨论，试图设计具有所需的和/或最佳的润湿特性的表面。对各种表面的分析揭示了可能导致莲花效应的重要几何参数（高CA > 150°和低CAH 150°和高CAH 10°）。
A two-dimensional (2D) thermodynamic model is proposed to predict the contact angle (CA) and contact angle hysteresis (CAH) of different types of surface geometries, particularly those with asperities having nonflattened tops. The model is evaluated by micro/nano sinusoidal and parabolic patterns fabricated by laser ablation. These microstructures are analyzed thermodynamically through the use of the Gibbs free energy to obtain the equilibrium contact angle (CA) and contact angle hysteresis (CAH). The effects of the geometrical details of two types of microstructures on maximizing the superhydrophobicity of the nanopatterned surface are also discussed in an attempt to design surfaces with desired and/or optimum wetting characteristics. The analysis of the various surfaces reveals the important geometrical parameters that may lead to the lotus effect (high CA > 150° and low CAH 150° and high CAH ≫ 10°).