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Type: Artigo de periódico
Title: Measurement and correlation of excess molar enthalpy H-m(E) for (1,2-propanediol, or 1,3-propanediol, or 1,4-butanediol plus water) at the temperatures (298.15, 323.15, and 343.15) K
Author: Nagamachi, MY
Francesconi, AZ
Abstract: The excess molar enthalpies for (1,2-propanediol, or 1,3-propatiediol, or 1,4-butanediol + water) have been measured at three different temperatures under atmospheric pressure over the whole composition range using a modified 1455 Parr solution calorimeter. For the temperature range studied all the mixtures exhibit negative values for H-m(E) being less negative with increasing temperature. The obtained values have been correlated by a model [M.Y. Nagamachi, Ph.D. Thesis, Universidade Estadual de Campinas, Brazil, 2001.] in which hydrophobic effects are considered. The calculated values are in good agreement with the experimental ones. The influence of methyl group of alkanediol on hydrophobic hydration as well as the influence of the position of OH groups on hydrophilic hydration is discussed. (C) 2005 Elsevier Ltd. All rights reserved.
Subject: excess enthalpy
hydrophobic effect
Country: Inglaterra
Editor: Academic Press Ltd Elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.jct.2005.06.018
Date Issue: 2006
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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