A Dip-Decoating Process for Producing Transparent Bi-Superhydrophobic and Wrinkled Water Surfaces
A Dip-Decoating Process for Producing Transparent Bi-Superhydrophobic and Wrinkled Water Surfaces
复制标题
用于生产透明双超疏水和皱纹水面的浸涂工艺
DOI：
10.1002/admi.201800356
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发表时间：
2018-08-09
影响因子：
5.4
通讯作者：
Geng, Xingguo
中科院分区：
文献类型：
--
作者：
Li, Xiaoguang;Wang, Yiqi;Geng, Xingguo
由于在使用超疏水表面的大多数应用中需要机械强度，因此已经进行了许多努力来增强该性质。然而，机械弱点也可能是有用的，但很少有人关注这个看似不受欢迎的特征。在这里，使用溶胶-凝胶SiO2涂层作为弱表面，浸渍脱涂层现象被证明发生时，从水中浸泡和撤回的涂层。因此，涂层的纳米颗粒（NP）外层的一部分通过三相线的剪切运动而剥离，产生由相邻的原始区域和浸渍区域构造的双超疏水表面，具有不同的颜色、粘附力和组成稳定性。这样的Janus表面，它也具有由于反射而导致的反射透射率，可以用作用于液滴操纵的独特的多功能平台。浸渍-脱膜技术也是一种独特的将颗粒引入水面的方法，其中剥离的纳米颗粒的密度和分布可以通过多次浸渍过程来调节。由于纳米粒子的高密度而产生的皱皱水面可用于LB膜技术，并在基础研究中具有潜力，如被膜液体的蒸发。
As mechanical strength is required in most applications using superhydrophobic surfaces, much effort has been applied toward enhancing this property. However, mechanical weakness can also be useful, but little attention has been focused on this seemingly undesirable feature. Here, using a sol-gel SiO2 coating as a weak surface, a dip-decoating phenomenon is demonstrated to occur when immersing and withdrawing the coating from water. As a result, part of the coating's outer layer of nanoparticles (NPs) is peeled off by shearing motions of the three-phase line, generating a bi-superhydrophobic surface constructed by adjacent pristine and dipped areas, with different colors, adhesive forces, and compositional stabilities. Such a Janus surface, which also features ultrahigh transmittance due to antireflection, can be used as a peculiar multifunctional platform for droplet manipulations. The dip-decoating technique also works as a distinctive way for introducing particles onto water surface, in which the density and distribution of peeled NPs can be adjusted by multi-dipping processes. The wrinkled water surface, caused by high NP density, can be used with the Langmuir-Blodgett coating technique and have potential in fundamental studies, such as the evaporation of coated liquids.