Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst MA (USA).
Angew Chem Int Ed Engl. 2016 Jan 4;55(1):244-8. doi: 10.1002/anie.201509385. Epub 2015 Nov 16.
Recent strategies to prepare "omniphobic" surfaces have demonstrated that minimizing contact angle hysteresis (CAH) is the key criterion for effectiveness. CAH is affected by chemistry and topography defects at the molecular and higher levels, thus most surfaces exhibit significant CAH. Preparative methods for stable coatings on smooth substrates with negligible CAH (<2°) for a broad range of liquids have not been reported. In this work, we describe a simple and rapid procedure to prepare omniphobic surfaces that are stable under pressure and durable at elevated temperatures. Consistent with theory, they exhibit sliding angles that decrease with liquid surface tension. Slippery omniphobic covalently attached liquid (SOCAL) surfaces are obtained through acid-catalyzed graft polycondensation of dimethyldimethoxysilane. The smooth, stable, and temperature-resistant coatings show extremely low CAH (≤1°) and low sliding angles for liquids that span surface tensions from 78.2 to 18.4 mN m(-1).
最近制备“全憎型”表面的策略表明，最小化接触角滞后（CAH）是有效性的关键标准。CAH 受到分子和更高水平的化学和形貌缺陷的影响，因此大多数表面表现出显著的 CAH。对于具有低 CAH（<2°）的平滑基底的稳定涂层的制备方法（对于广泛的液体）尚未报道。在这项工作中，我们描述了一种简单快速的方法来制备具有压力稳定性和高温耐久性的全憎型表面。与理论一致，它们表现出随液体表面张力减小的滑动角。通过酸催化的二甲基二甲氧基硅烷接枝缩聚反应获得滑溜的全憎型共价附着液体（SOCAL）表面。这种光滑、稳定且耐温的涂层对跨越 78.2 至 18.4 mN m-1 的表面张力的液体表现出极低的 CAH（≤1°）和低滑动角。
