Thermodynamic Properties of an Aqueous Solution of Tetraethylene Glycol Diethyl Ether
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概要
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The excess Gibbs energy of mixing, <I>G<SUP>E</SUP></I>; the excess enthalpy of mixing, <I>H<SUP>E</SUP></I>, and the excess volume of the mixing, <I>V<SUP>E</SUP></I>, of the tetraethylene glycol diethyl ether+water system have been measured as functions of the composition at 25°C. The <I>G<SUP>E</SUP></I>, which has been determined through the isopiestic measurement of the water activity, is positive over the entire range of composition and has its maximum at 40 mol% ether. As has been found for analogous systems, the <I>s</I>-curve of <I>H<SUP>E</SUP></I> is again found; that is, <I>H<SUP>E</SUP></I> is large and negative (exothermic) in the water-rich region and positive (endothermic) in the ether-rich region. The <I>V<SUP>E</SUP></I> is negative over the whole range of composition and has a minimum at 23 mol% ether. These results are discussed in the light of the structural modifications of water in the immediate neighborhood of the ether molecule.
- 公益社団法人 日本化学会の論文
著者
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Nakayama Haruo
Department of Applied Chemistry, Faculty of Engineering, Yokohama National University
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