Hierarchical polymeric textures via solvent-induced phase transformation: A single-step production of large-area superhydrophobic surfaces
Hierarchical polymeric textures via solvent-induced phase transformation: A single-step production of large-area superhydrophobic surfaces
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DOI：
10.1016/j.colsurfa.2011.11.014
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发表时间：
2012-01-20
影响因子：
5.2
通讯作者：
Varanasi, Kripa K.
中科院分区：
文献类型：
--
作者：
Cui, Yuehua;Paxson, Adam T.;Varanasi, Kripa K.
我们报道了一种快速，单步方法，通过丙酮诱导的聚碳酸酯相变产生大面积的超疏水表面。聚合物的结晶导致形成由微孔球晶和纳米纤丝组成的分级结构，并导致超疏水润湿行为。系统地研究了丙酮处理时间对表面形貌的影响，以优化丙酮处理时间，并阐明结构形成机理。所得的表面表现出高接触角，低接触角滞后，并在液滴冲击过程中完全去湿。润湿和反润湿压力的理论分析表明，纳米尺度的形态是实现液滴抗冲击性的关键。这种简单的相变方法可以更广泛地应用于其他溶剂-聚合物体系，用于制造大面积的分层表面纹理。(C)2011爱思唯尔有限公司版权所有。
We report on a rapid, single-step method to produce large-area superhydrophobic surfaces via acetone-induced phase transformation of polycarbonate. Crystallization of the polymer leads to the formation of a hierarchical structure composed of microporous spherulites covered with nano-fibrils, and resulted in superhydrophobic wetting behavior. A systematic study of the dependence of surface morphology on the acetone treatment time was conducted to optimize the treatment time and to elucidate the structure formation mechanism. The resulting surfaces exhibit high contact angles, low contact angle hysteresis, and complete dewetting during droplet impact. Theoretical analysis of the wetting and anti-wetting pressures shows that the nano-scale morphology is critical for achieving droplet impact resistance. This simple phase transformation approach could be more broadly applied to other solvent-polymer systems for fabricating large-area hierarchical surface textures. (C) 2011 Elsevier B.V. All rights reserved.