Molar excess enthalpies and volumes of cyclohexane – isomeric decalin systems at 25 °C

Abstract

The molar excess enthalpies and volumes of the systems cyclohexane -cis-decalin and cyclohexanetrans-decalin at 25 'C were determined by direct calorimetric and dilatometric measurements. The Flory theory of mixtures provides a useful basis for a qualitative interpretation of the results.

Pressure Dependence of the Intrinsic Viscosity of Poly(dimethylsiloxane)-Cyclohexyl Bromide Solution

“…The density of PDMS and cyclohexyl bromide under high pressure was measured by use of a piston-cylinder type highpressure cell, the details of which are described elsewhere. 20 The concentration of the solution was calculated from these densities.…”

A Parameterization of Cholesterol for Mixed Lipid Bilayer Simulation within the Amber Lipid14 Force Field

“…Molar volume of trans -decalin and hexadecane mixtures at 298 K. Experimental values are calculated from Benson et al and Fuchs et al combined with excess molar volumes from Letcher et al − Simulation molar volumes are from MD simulations of trans -decalin with cholesterol parameters and hexadecane with the default Lipid14 parameters.…”

Excess Thermodynamic Properties of Cyclopentane – Isomeric Decalin Systems at 25 °C

“…The volume changes for the four cycloalkaneisomeric decalin systems are all negative and the contractions for those formed from cyclopentane are considerably larger than for their cyclohexane counterparts (1). Qualitatively, this is in line with the greater disparity in the size of the component molecules in the cyclopentane systems.…”

“…2,4, and 5, and from Table 6 that the Flory theory isfairly successful in correlating the excess properties of the cyclopentane -isomeric decalin systems. In some respects the correlation is better than that achieved previously for the cyclohexaneisomeric decalin systems (1). In order to approximate the sigmoid-shaped HE curves of the latter systems, it was necessary to adjust not only X,,, but also the ratio s,/s,, and to use values of s,/s, which were physically unrealistic.…”

“…Measurements of the excess enthalpies and volumes of cyclohexane -isomeric decalin mixtures at 25 "C were described recently (1). The results of similar calorimetric and dilatometric studies of the systems cyclopentane -cisdecalin and cyclopentane -trans-decalin are reported in the present paper, along with their vapor-liquid equilibria determined by the static method.…”