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Membranes 2018, 8(2), 29; https://doi.org/10.3390/membranes8020029

“Modified” Liquid–Liquid Displacement Porometry and Its Applications in Pd-Based Composite Membranes

1
Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Received: 14 May 2018 / Revised: 1 June 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
(This article belongs to the Special Issue Pd-based Membranes: Overview and Perspectives)
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Abstract

For H2 separation by Pd-based composite membranes, the pore mouth size distribution of the porous support immediately affects the quality of the deposited layer, including continuity and defect/pinhole formation. However, there is a lack of convenient and effective methods for characterization of pore mouth size of porous supports as well as of defect distribution of dense Pd-based composite membranes. Here we introduce a novel method by modifying conventional liquid–liquid displacement porometry. When the pore tunnels are filled with Liquid B and the outer surface is occupied by Liquid A, the reopening of the pore mouth depends on the pressure of Liquid B and the interfacial tension at the position of the pore mouth, from which the pore mouth size can be determined according to the Young–Laplace equation. Our experimental tests using this method with model samples show promising results, which are well supported by those obtained using FESEM (fild emission scanning electron microscope), AFM (atomic force microscope), and conventional liquid–liquid displacement porometry. This novel method can provide useful information for not only surface coatings on porous substrates but also for modification of dense membrane defects; thus, broad utilizations of this technique can be expected in future study. View Full-Text
Keywords: MLLDP; porous membrane; pore mouth size distribution; dense Pd membrane; defect distribution MLLDP; porous membrane; pore mouth size distribution; dense Pd membrane; defect distribution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zheng, L.; Li, H.; Yu, H.; Kang, G.; Xu, T.; Yu, J.; Li, X.; Xu, H. “Modified” Liquid–Liquid Displacement Porometry and Its Applications in Pd-Based Composite Membranes. Membranes 2018, 8, 29.

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