Kim Seulbi, Park Ji Hun
Department of Science Education, Ewha Womans University, Seoul 03760, Korea.
ACS Appl Mater Interfaces. 2020 Sep 16;12(37):42109-42118. doi: 10.1021/acsami.0c11746. Epub 2020 Aug 31.
A coating must remain intact to perform its inherent functions on a surface, and often functional organic coatings fail due to deterioration because of their intrinsic vulnerabilities. In this work, we present a biomimetic material based on a glass sponge to provide a robust silica composite nanocoating with an antifog effect. The silica composite nanocoating was constructed with a binary film structure consisting of (1) a Fe(III)-tannic acid (TA) nanofilm for adhesion to coat the substrates and (2) a SiO layer to enhance the durability of the coating. Due to the universal coating property of Fe(III)-TA nanofilms, we demonstrated that the silica composite nanocoating was effective regardless of the substrate. By layer-by-layer assembly of the silica composite, it is possible to precisely control the nanocoating thickness. The superhydrophilic nature of the SiO layer showed an exceptional antifog effect that remained intact against multiple deteriorative conditions, including acid treatment, peroxide degradation, sudden temperature change, severe heat conduction, and oil contamination. In addition, the silica composite nanocoating is scalable for surfaces of different shapes and sizes with the aid of a spray-assisted deposition technique. The bioinspired, multicomposite nanocoating strategy herein contributes to the improvement of organic coatings for uses in applications to tackle current technological problems.
涂层必须保持完整才能在表面发挥其固有功能，而功能性有机涂层常常因其内在的脆弱性而因劣化失效。在这项工作中，我们展示了一种基于玻璃海绵的仿生材料，以提供一种具有防雾效果的坚固二氧化硅复合纳米涂层。该二氧化硅复合纳米涂层由二元膜结构构成，包括（1）用于粘附以涂覆基材的铁（III）-单宁酸（TA）纳米膜和（2）用于增强涂层耐久性的SiO层。由于铁（III）-TA纳米膜具有普遍的涂层性能，我们证明了这种二氧化硅复合纳米涂层无论基材如何都有效。通过二氧化硅复合材料的逐层组装，可以精确控制纳米涂层的厚度。SiO层的超亲水性表现出优异的防雾效果，在多种劣化条件下，包括酸处理、过氧化物降解、温度骤变、强热传导和油污污染，该效果都能保持完好。此外，借助喷雾辅助沉积技术，二氧化硅复合纳米涂层可扩展用于不同形状和尺寸的表面。本文所采用的受生物启发的多复合纳米涂层策略有助于改进有机涂层，以用于解决当前技术问题的应用中。
