Automatic Recording of Liquid Penetration through Filter Paper and Wetting Behavior of Liquids
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概要
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The penetration of liquid through a vertically suspended filter paper was studied by measuring the weight increase with a strain gauge tensiometer for several organic liquids and aqueous solutions. The plot of penetration rate <I>K</I>=<I>h</I>⁄<I>t</I><SUP>1⁄2</SUP> (<I>h</I>, height of liquid rise and <I>t</I>, time) against (σ⁄η)<SUP>1⁄2</SUP> (σ, surface tension and η, viscosity coefficient of wetting liquids) showed two straight lines, one for organic liquids and the other for aqueous solutions of sodium dodecyl sulfate. Both these lines passed the origin, suggesting Lucas-Washburn formula to hold. The plots for ethyl alcohol-water mixtures showed behaviors intermediate between those two linear relations. The aqueous solutions caused swelling of fibers and reduced the mean capillary radius of the filter paper, resulting in a decrease of the penetration constant <I>P</I>=<I>K</I>⁄(σ⁄η)<SUP>1⁄2</SUP> but with a rather large <I>K</I> value. The plots for penetration of water through an untreated paper fell far below the straight line obtained for aqueous solutions of sodium dodecyl sulfate. The penetration was recovered by removing fatty contaminants from the filter paper using Soxhlet extractor with ether. The results of a simple test of unfolding a folded paper by touching it with liquids are also in line with those mentioned above.
- 公益社団法人 日本化学会の論文
著者
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Nakamura Akio
Department Of Information And Computer Sciences Saitama University
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Sasaki Tsunetaka
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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Seimiya Tsutomu
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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