A facile fabrication of acid-proof membranes with superhydrophobic high adhesion in air

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2023-05, Vol.664, p.131185, Article 131185
• Main Authors: Tian, Guiying, Cai, Weiyi, Huang, Chuanfeng, Xiang, Jun, Gao, Yifang, Xiao, Yiming, Zhang, Lei, Cheng, Penggao, Zhang, Jianping, Tang, Na
• Format: Article
• Language: English
• Subjects: Acid-proof membrane; Superhydrophobic; Vapor-induced phase separation; Water adhesive force; Water contact angle
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.131185

superhydrophobic surfaces with superhigh adhesion is significant in special engineering applications, but an elaborate superhydrophobic structure is difficult at artificial fabrication. In this study, a poly[2,2′-(4,4′-oxybis(1,4-phenylene)− 5,5′-bibenzimidazoles]-polydimethylsiloxane (OPBI-PDMS) membrane is prepared via a facile vapor-induced phase separation method, which exhibits high contact angle of 154.1°, high water adhesion and high acidic resistance for 200 h. The results indicate that the sponge-like hierarchical structure formed on the sticky surface of OPBI-PDMS membrane, which offers high hydrophobic property and high adhesion in air, based on the capillary action and pinning effect. Coupled with the high acid-proof performance, the OPBI-PDMS blending membrane is successfully applied in the controllable transferring of acid droplets. [Display omitted] •OPBI-PDMS membrane with superhydrophobic high adhesion is prepared via a facile VIPS method.•Superior structural stability against acidic medium is found in the OPBI-PDMS membrane.•Holding time of the WCA above 150° of OPBI-PDMS membrane is long enough for nondestructive transfer of acid droplets.