Chen Jianyu, Yuan Luhan, Shi Chu, Wu Caiqin, Long Zhiwen, Qiao Hui, Wang Keliang, Fan Qi Hua
Key Laboratory of Eco-textiles, Ministry of Education, Jiangnan University, Wuxi 214122, China.
Fraunhofer USA, Inc., Center Midwest, Division for Coatings and Diamond Technologies, Michigan State University, East Lansing, Michigan 48824, United States.
ACS Appl Mater Interfaces. 2021 Apr 21;13(15):18142-18151. doi: 10.1021/acsami.1c03539. Epub 2021 Apr 12.
The use of toxic components and short longevity greatly restricted the commercial application of superhydrophobic surfaces in oil-water separation, antifouling, and self-cleaning. To address these concerns, a durable, robust, and fluorine-free superhydrophobic fabric is prepared on account of inspiration of nature. In this work, submicrometer-sized silica particles with different particle sizes are deposited onto cotton fabrics, followed by hydrophobic modification of poly(dimethylsiloxane) (PDMS), and consequently bonded the substrate and coating via powerful covalent bonds through a simple dip-coating technique. The rough surface with an imitated lotus-leaf-like hierarchical protrusion structure is constructed by deposited submicrometer-sized particles with different particle sizes, while the fabric with a low surface energy is achieved by the hydrophobic modification of PDMS. Ultimately, the fabricated fabric exhibits extraordinary superhydrophobicity with a high water contact angle (WCA) of 161° and a small sliding hysteresis angle (SHA) of 2.4°. Besides, considerable mechanical stability to withstand 130 sandpaper abrasion cycles and 40 washing cycles, and chemical resistance with sustained superhydrophobic property in various harsh environments (e.g., boiling water, strong acid/base solutions, and various organic solvents), are presented. Moreover, higher than 90% separation efficiency with a contact angle >150 ° is produced even after 50 cycles when the fabricated fabric serves as a filter during the oil-water separation besides its outstanding staining resistance and self-cleaning property.
有毒成分的使用和使用寿命短极大地限制了超疏水表面在油水分离、防污和自清洁等方面的商业应用。为了解决这些问题，受大自然启发，制备了一种耐用、坚固且无氟的超疏水织物。在这项工作中，将不同粒径的亚微米级二氧化硅颗粒沉积在棉织物上，随后用聚二甲基硅氧烷（PDMS）进行疏水改性，并通过简单的浸涂技术经由强大的共价键将基材与涂层结合。通过沉积不同粒径的亚微米级颗粒构建出具有仿荷叶状分级突起结构的粗糙表面，而通过PDMS的疏水改性实现了具有低表面能的织物。最终，所制备的织物表现出非凡的超疏水性，水接触角（WCA）高达161°，滑动滞后角（SHA）小至2.4°。此外，该织物还具有相当的机械稳定性，能够承受130次砂纸磨损循环和40次洗涤循环，并且在各种恶劣环境（如沸水、强酸/碱溶液和各种有机溶剂）中具有持续超疏水性能的耐化学性。此外，当所制备的织物在油水分离过程中用作过滤器时，即使经过50次循环，仍能产生高于90%的分离效率，且接触角>150°，同时还具有出色的抗污性和自清洁性能。
