Thermody namic functions of 1,2-alkanediols in dilute aqueous solutions |
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Authors: | M Fujisawa T Matsushita Y Matsui K Akasaka T Kimura |
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Institution: | (1) Department of Biotechnological Science, Kinki University Uchita-cho, Naga-gun, Wakayama 649-6493, Japan;(2) Department of Chemistry, Kinki University Kowakae, Higashi-osaka 577-8502, Japan |
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Abstract: | The heat capacities of binary aqueous solutions of 1,2-ethanediol, 1,2-propanediol and 1,2-butanediol were measured at temperatures
ranging from 283.15 to 338.15 K by differential scanning calorimetry. The partial molar heat capacities at the infinite dilution
were then calculated for the respective alkanediols. For 1,2-ethanediol or 1,2-propanediol, the partial molar heat capacities
at the infinite dilution of increased with increasing temperature. In contrast, the partial molar heat capacities of 1,2-butanediol
at the infinite dilution decreased with increasing temperature.
Heat capacity changes by dissolution of the alkanediols were also determined. Heat capacity changes caused by the dissolution
of 1,2-ethanediol or 1,2-propanediol were increase with increasing temperature. On the other hand, heat capacity changes caused
by the dissolution of 1,2-butanediol are decrease with increasing temperature. Thus our results indicated that the structural
changes of water caused by the dissolution of 1,2-butanediol differed from that of the two other alkanediols.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | 1 heat capacity hydrophobic hydration infinite dilution 2-alkanediol |
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