Microstructured Nematic Liquid Crystalline Elastomer Surfaces with Switchable Wetting Properties
Microstructured Nematic Liquid Crystalline Elastomer Surfaces with Switchable Wetting Properties
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DOI：
10.1002/adfm.201203291
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发表时间：
2013-06
影响因子：
19
通讯作者：
Zi Liang Wu;A. Buguin;Hong Yang;J. Taulemesse;N. Le Moigne;A. Bergeret;Xiaogong Wang;P. Keller-
中科院分区：
文献类型：
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作者：
Zi Liang Wu;A. Buguin;Hong Yang;J. Taulemesse;N. Le Moigne;A. Bergeret;Xiaogong Wang;P. Keller-
受荷叶的启发，科学家们开发了许多超疏水表面，其中一些表面在外界刺激下表现出显著的疏水和亲水状态转换。然而，这种转换通常依赖于化学性质的改变，而不是表面地形结构的改变。本文报道了由向列液晶弹性体（LCEs）制成的微结构响应表面的粗糙度变化相关的可切换润湿特性。首先，在低向列向向各向同性转变温度（TNI）下，合成了各种碳酸盐LC单体和侧对lce。然后，用3″‐乙烯基羰基氧基丙基2,5‐二（4′‐辛基苯甲酰氧基）苯甲酸酯单体制备LCEs， TNI为76°C，收缩率为34%，通过复制成型技术构建微柱阵列覆盖的表面。微柱的收缩引起微结构表面的可逆粗糙度变化。该微结构表面的水接触角随温度变化，表明构建具有可切换润湿特性的表面的成功方法。
Inspired by the lotus leaf, scientists have developed many superhydrophobic surfaces, some of which show remarkable switching between hydrophobic and hydrophilic state under external stimuli. However, the switch usually relies on the change of chemical properties rather than on the modification of the topographic structure of the surface. In this paper, the roughness‐change‐related switchable wetting properties of microstructured responsive surfaces made of nematic liquid crystalline elastomers (LCEs) is reported. First, various carbonate LC monomers and side‐on LCEs are synthesized with low nematic‐to‐isotropic transition temperature, TNI. Then, LCEs prepared from 3″‐vinylcarbonyloxypropyl 2,5‐di(4′‐octyloxybenzoyloxy)benzoate monomer, with TNI of 76 °C and contraction of 34% are used to construct a surface covered with micropillar arrays by using a replica molding technique. The contraction of the micropillars induces a reversible roughness change of the microstructured surface. Water contact angle of this microstructured surface changed with temperature, indicating a successful approach at building a surface with switchable wetting properties.