Surface free energies of two kinds of graphite fluorides, (CF)n and (C2F)n.
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概要
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The surface free energies of two kinds of graphite fluorides, (CF)<I><SUB>n</SUB></I> and (C<SUB>2</SUB>F)<I><SUB>n</SUB></I>, were estimated from the contact angles of several liquids. The contact angles of water on flaky (CF)<I><SUB>n</SUB></I> and (C<SUB>2</SUB>F)<I><SUB>n</SUB></I> were 117° and 116°, respectively, being slightly larger than that for poly(tetrafluoroethylene), while the values for tablets of powdery (CF)<I><SUB>n</SUB></I> and (C<SUB>2</SUB>F)<I><SUB>n</SUB></I> were 143° and 141°, respectively, which indicates that powdery graphite fluoride is hardly wetted by water. From the contact angles obtained, the surface free energies were estimated to be <I>ca.</I> 18 mJ/m<SUP>2</SUP> for both flaky (CF)<I><SUB>n</SUB></I> and (C<SUB>2</SUB>F)<I><SUB>n</SUB></I>, <I>ca.</I> 2 mJ/m<SUP>2</SUP> for powdery (CF)<I><SUB>n</SUB></I> and <I>ca.</I> 3 mJ/m<SUP>2</SUP> for powdery (C<SUB>2</SUB>F)<I><SUB>n</SUB></I>. These differences depend on the surface conditions such as the packing of fluorine atoms, the roughness and porosity. From the contact angles for the tablets of (CF)<I><SUB>n</SUB></I>–polyethylene mixtures, it is suggested that the anode effect in the fluorine or aluminium electrolysis takes place when the surface of carbon anode is partially covered by graphite fluoride.
- 公益社団法人 日本化学会の論文
著者
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Watanabe Nobuatsu
Department of Industrial Chemistry, Faculty of Engineering, Kyoto University
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Nakajima Tsuyoshi
Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
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Ohsawa Noboru
Sumitomo Aluminium Smelting Co. Ltd., Toyo Works
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