Nanofilms directly formed on macro-porous substrates for molecular and ionic sieving. Issue 7 (31st January 2018)

• Record Type: Journal Article
• Authors: Yang, Hao-Cheng; Wu, Ming-Bang; Hou, Jingwei; Darling, Seth B.; Xu, Zhi-Kang
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 7(2018)
• Page Start: 2908
• Page End: 2913
• Publication Date: 2018-01-31
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta10438c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An interfacial strategy is developed to fabricate and composite sub-15 nm nanofilms directly on macro-porous substrates for molecular and ionic sieving. Abstract : Large-scale fabrication of nanofilms directly on macro-porous substrates remains a major challenge in preparing advanced separation membranes. In this work, polyphenol/polyamine nanofilms with a minimum thickness around 13 nm were formed at the gas/liquid interface and simultaneously composited onto hydrophobic macro-porous substrates with the pore size of several hundreds of nanometers, a process driven by high oxygen concentration and interfacial energy at the interface. The as-prepared nanofilms show nearly complete rejection to a wide spectrum of dye molecules, and above 90% rejection to divalent cations such as Mg 2+ and Ca 2+ with a relative high permeate flux above 15 L m −2 h −1 bar −1, demonstrating great potential in ionic and molecular sieving processes.