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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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