Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6017
Title: Diffusion of aromatic compounds in nonaqueous solvents : a study of solute, solvent, and temperature dependences
Authors: Chan, TC
Tang, WK
Keywords: Diffusion
Organic compounds
Viscosity
Issue Date: 14-Jun-2013
Publisher: American Institute of Physics
Source: Journal of chemical physics, 14 June 2013, v. 138, no. 22, 224503, p. 1-15 How to cite?
Journal: Journal of chemical physics 
Abstract: Tracer diffusivities (limiting mutual diffusion coefficients) of nonassociated aromatic compounds in n-hexane and cyclohexane have been measured at 298.2 K by Taylor's dispersion method. These new data, together with other diffusivities of nonassociated pseudoplanar solutes reported in the literature, are used to determine the separate effects of solute and solvent on tracer diffusion. The data show that for a given pseudoplanar solute diffusing in different solvents at 298.2 K, the tracer diffusivity is dependent not only on the fractional viscosity of the solvent but also on a function of the solvent's molar density, molecular mass, and free volume fraction. For different pseudoplanar aromatic solutes diffusing in a particular solvent at a constant temperature, there is a linear relationship between the reciprocal of the tracer diffusivity and the molecular volume of the solutes. The results are discussed in respect to relevant theories and experimental studies in the literature. An idealized relation, developed on the basis of the Einstein equation by incorporating the newly found solute and solvent dependences, is capable of describing a total of 176 diffusivities of nonassociated pseudoplanar solutes in various solvents at different temperatures to within an average error of ±2.8%.
URI: http://hdl.handle.net/10397/6017
ISSN: 0021-9606
EISSN: 1089-7690
DOI: 10.1063/1.4808216
Rights: © 2013 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in T. C. Chan & W. K. Tang, J. Chem. Phys. 138, 224503 (2013) and may be found at http://link.aip.org/link/?jcp/138/224503
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