Center for Material Design Science, School of Integrated Design Engineering, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
ACS Appl Mater Interfaces. 2018 Jan 31;10(4):4198-4205. doi: 10.1021/acsami.7b15689. Epub 2018 Jan 22.
Inspired by natural living things such as lotus leaves and pitcher plants, researchers have developed many excellent antifouling coatings. In particular, hot-water-repellent surfaces have received much attention in recent years because of their wide range of applications. However, coatings with stability against boiling in hot water have not been achieved yet. Long-chain perfluorinated materials, which are often used for liquid-repellent coatings owing to their low surface energy, hinder the potential application of antifouling coatings in food containers. Herein, we design a fluorine-free slippery surface that immobilizes a biocompatible lubricant layer on a phenyl-group-modified smooth solid surface through OH-π interactions. The smooth base layer was fabricated by modification of phenyltriethoxysilane through a sol-gel method. The π-electrons of the phenyl groups interact with the carboxyl group of the oleic acid used as a lubricant, which facilitates immobilization on the base layer. Water droplets slid off the surface in the temperature range from 20 to 80 °C at very low sliding angles (<2°). Furthermore, we increased the π-electron density in the base layer to strengthen the OH-π interactions, which improved long-term boiling stability under hot water. We believe that this surface will be applied in fields in which the practical use of antifouling coatings is desirable, such as food containers, drink cans, and glassware.
受荷叶和猪笼草等天然生物的启发，研究人员已经开发出许多优秀的防污涂层。特别是，近年来具有抗热水功能的疏水面得到了广泛关注，因为它们具有广泛的应用。然而，具有抗热水沸腾稳定性的涂层尚未实现。长链全氟化合物材料由于其低表面能，常用于疏液涂层，这阻碍了防污涂层在食品容器中的潜在应用。在此，我们设计了一种无氟光滑表面，通过 OH-π 相互作用将生物相容性的润滑剂层固定在苯基修饰的光滑固体表面上。通过溶胶-凝胶法修饰苯基三乙氧基硅烷来制备光滑的基底层。苯基基团的π 电子与用作润滑剂的油酸的羧基相互作用，有利于在基底层上固定。在 20 至 80°C 的温度范围内，水在极低的滑动角度（<2°）下从表面滑落。此外，我们增加了基底层中的 π 电子密度，以增强 OH-π 相互作用，从而提高了在热水下的长期沸腾稳定性。我们相信，这种表面将应用于需要防污涂层实际应用的领域，如食品容器、饮料罐和玻璃器皿。
