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Diffusion control of porous membrane by modifying the nanopore properties

Title
Diffusion control of porous membrane by modifying the nanopore properties
Authors
Kim M.H.Ayral A.Park C.-B.Choy J.-H.Oh J.-M.
Ewha Authors
최진호
SCOPUS Author ID
최진호scopus
Issue Date
2011
Journal Title
Journal of Nanoscience and Nanotechnology
ISSN
1533-4880JCR Link
Citation
vol. 11, no. 2, pp. 1656 - 1659
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We have investigated the diffusion of various solvents on nanoporous membranes with various pore size and surface energy. We have modified the size of pore channel and surface energy of porous membrane through grafting different sized alkyl chain on inorganic membranes. Typically, disc type zirconia membranes with pore size of 3 nm and silica ones with 1 nm pore were purchased from Inocermic Co. Ltd. (Germany), and the surface and pore channel was modified by either octyltriethoxysilane (OTS) with chain length ∼1 nm or pentyltriethoxysilane (PTS) with chain length ∼0.5 nm. The water contact angles of both OTS and PTS grafted membrane were larger than 100° indicating the hydrophobically modified surface. Contact angles of hydrophilic and hydrophobic solvents were also examined to obtain exact surface energy (γ SV) of grafted membrane, and the values were determined to be 56.3, 45.3, and 42.2 mN/m for ungrafted, PTS- and OTS-grafted membrane, respectively. The solvent diffusion patterns were evaluated by measuring the concentration gradient of small dye molecule, azobenzene. The diffusion coefficients of various solvents were measured on the basis of Fick's diffusion law. It was concluded that the diffusivity is dependent on the pore size for solvent with low surface tension and on the γ SV value for solvent with high surface tension. Copyright © 2011 American Scientific Publishers All rights reserved.
DOI
10.1166/jnn.2011.3303
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자연과학대학 > 화학·나노과학전공 > Journal papers
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