Wang Yanbin, Kang Lihui, Li Zhaoxia, Su Qiong, Pang Shaofeng, Liang Lichun, Wang Dian, Cao Shijun
School of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China.
Key Laboratory of Environment-Friendly Composite Materials of the State Ethnic Affairs Commission, Lanzhou 730030, China.
Molecules. 2021 Oct 22;26(21):6401. doi: 10.3390/molecules26216401.
Recently, superhydrophobic surfaces with self-cleaning ability have attracted broad research interest due to their huge potential in daily lives and industrial applications, but the use of fluorinate, toxic organic compounds, and expensive feedstocks make superhydrophobic materials a great challenge in practical application. In this study, we present a facile dip-coating strategy to prepare superhydrophobic coatings with self-cleaning properties based on a non-fluorine and non-toxic system by using eco-friendly corn straw as raw material. During this process, aromatic carbon particles with rough hierarchical structures were prepared firstly via a simple fast pyrolysis process, followed by modification with polydimethylsiloxane (PDMS) in absolute ethanol solvent to decrease the surface free energy. Research shows these natural straw-derived carbons display a microstructure of several protrusions which is similar to the lotus leave's and the resulted coatings exhibit an outstanding superhydrophobic property with a static water contact angle (WCA) of 151.67 ± 1.36 degrees. In addition, the as-prepared coatings possessed excellent self-cleaning performance: no contaminations were observed on the surfaces after examining with sludge, calcimine, water, and common liquids such as tea, milk, soybean milk as well as ink, which have a broad range of potential application in the field of antifouling, waterproofing, and anticorrosive.
近年来，具有自清洁能力的超疏水表面因其在日常生活和工业应用中的巨大潜力而引起了广泛的研究兴趣，但含氟、有毒有机化合物以及昂贵原料的使用使得超疏水材料在实际应用中面临巨大挑战。在本研究中，我们提出了一种简便的浸涂策略，以环保型玉米秸秆为原料，基于无氟无毒体系制备具有自清洁性能的超疏水涂层。在此过程中，首先通过简单的快速热解过程制备出具有粗糙分级结构的芳香碳颗粒，然后在无水乙醇溶剂中用聚二甲基硅氧烷（PDMS）进行改性以降低表面自由能。研究表明，这些天然秸秆衍生的碳呈现出类似于荷叶的多个凸起的微观结构，所得涂层表现出优异的超疏水性能，静态水接触角（WCA）为151.67±1.36度。此外，所制备的涂层具有优异的自清洁性能：在用污泥、石灰、水以及茶、牛奶、豆浆和墨水等常见液体检测后，表面未观察到污染，这在防污、防水和防腐领域具有广泛的潜在应用。
