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Wettability, surface free energy and permeability of porous ceramic membranes silylated by fluorocarbon groups
Authors: WANG Yukun, WEI Qi, ZHANG Shaokang, Li Qunyan, NIE Zuoren
Units: College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
KeyWords: perfluorodecyl groups; porous γ/α-Al2O3 ceramic membranes; surface free energy; wettability; permeability
ClassificationCode:O614.3+1
year,volume(issue):pagination: 2018,38(2):52-59

Abstract:
 Fluorocarbon groups were silylated on porous γ/α-Al2O3 ceramic membranes via post-grafting process with 1H,1H,2H,2H-Perflouorodecyltriethoxysilane(PFDTES) as silylation agent and ethanol as solvent. The surface morphology, chemical composition and wettability of the silylated porous γ/α-Al2O3 ceramic membranes were characterized. The influence of fluorocarbon groups on the surface free energy and gas/pure water permeation performance of the obtained materials was also investigated in detail. The results show that the incorporation of fluorocarbon greatly reduces the surface free energy of porous γ/α-Al2O3 ceramic membranes, and leads to a transformation from hydrophility to hydrophobicity. A slight decrease of gas permeance is observed due to the pore blocking of porous γ/α-Al2O3 ceramic membranes by fluorocarbon groups. The transport of gas molecules in the pore channels complies with Knudsen diffusion. Liquid water is not able to permeate the silylated porous α-Al2O3 ceramic and the silylated γ/α-Al2O3 ceramic membranes under a pressure difference of 0.35MPa. 

Funds:
国家自然科学基金(21171014),北京市教委科技计划重点项目(KZ201410005006)

AuthorIntro:
第一作者简介:王煜琨(1991-),男,甘肃武威人,硕士生,从事用于气体分离的微孔膜材料的制备与表征. *通讯作者,E-mail:qiwei@bjut.edu.cn

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