Du Ke, Jiang Youhua, Liu Yuyang, Wathuthanthri Ishan, Choi Chang-Hwan
Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA.
Department of Chemistry, University of California-Berkeley, Berkeley, CA 94720, USA.
Micromachines (Basel). 2018 Jun 18;9(6):304. doi: 10.3390/mi9060304.
The manipulation of droplet mobility on a nanotextured surface by oxygen plasma is demonstrated by modulating the modes of hydrophobic coatings and controlling the hierarchy of nanostructures. The spin-coating of polytetrafluoroethylene (PTFE) allows for heterogeneous hydrophobization of the high-aspect-ratio nanostructures and provides the nanostructured surface with "sticky hydrophobicity", whereas the self-assembled monolayer coating of perfluorodecyltrichlorosilane (FDTS) results in homogeneous hydrophobization and "slippery superhydrophobicity". While the high droplet adhesion (stickiness) on a nanostructured surface with the spin-coating of PTFE is maintained, the droplet contact angle is enhanced by creating hierarchical nanostructures via the combination of oxygen plasma etching with laser interference lithography to achieve "sticky superhydrophobicity". Similarly, the droplet mobility on a slippery nanostructured surface with the self-assembled monolayer coating of FDTS is also enhanced by employing the hierarchical nanostructures to achieve "slippery superhydrophobicity" with modulated slipperiness.
通过调节疏水涂层的模式和控制纳米结构的层级，展示了利用氧等离子体对纳米纹理表面上液滴流动性的操控。聚四氟乙烯（PTFE）的旋涂使得高纵横比纳米结构实现非均匀疏水化，并为纳米结构表面提供“粘性疏水性”，而全氟癸基三氯硅烷（FDTS）的自组装单分子层涂层则导致均匀疏水化和“光滑超疏水性”。在保持通过PTFE旋涂的纳米结构表面上的高液滴附着力（粘性）的同时，通过氧等离子体蚀刻与激光干涉光刻相结合来创建层级纳米结构，从而提高液滴接触角，以实现“粘性超疏水性”。同样，通过采用层级纳米结构来实现具有调制滑度的“光滑超疏水性”，也提高了具有FDTS自组装单分子层涂层的光滑纳米结构表面上的液滴流动性。
