Excess volumes and viscosities of mixtures of dimethylsulfoxide with normal alcohols at 40°C |
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Authors: | R K Dewan S P Gupta S K Mehta |
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Institution: | (1) Department of Chemistry, Panjab University, 160 014 Chandigarh, India |
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Abstract: | Excess volumes and viscosities have been determined for DMSO + n-hexanol, + n-heptanol, + n-octanol, and + n-decanol at 40°C. The excess partial molar volumes V
1
E
, changes in viscosities ![Delta](/content/m3845766h56k7037/xxlarge916.gif) , the parameter d of the Grunberg and Nissan expression, and excess Gibbs free energies of activation of flow G
*
E
have been calculated from the experimental data. All the excess volumes are positive over the whole composition range, with V
E
increasing with the length of the alkanol chain. V
E
results are discussed in terms of disruption of alkanol multimers, weakening of interactions between DMSO molecules, influence of interactions between components, and structural effects. The V
E
data have also been analyzed using the Prigogine-Flory-Patterson expression which separates V
E
into three contributions. Correlation is also observed between the sign of ![Delta](/content/m3845766h56k7037/xxlarge916.gif) and V
E
for all the mixtures studied. |
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Keywords: | Excess volume viscosities Gibbs free energies of activation of flow DMSO alkanols |
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