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Title: Diffusion of spherical solutes : a fractional molecular-hydrodynamic study of solvent dependence
Authors: Chan, TC
Li, KY
Li, HT
Keywords: Diffusivities in liquids
Molecular-hydrodynamic coupling
Mutual diffusion
Solvent dependence
Taylor dispersion measurement
Issue Date: 2016
Publisher: Elsevier
Source: Chemical physics, 2016, v. 468, p. 25-36 How to cite?
Journal: Chemical physics 
Abstract: Diffusivities of tetramethyltin, tetraethyltin, tetraethyllead, and 2,2-dichloropropane in methanol as well as tetraethyltin and tetraethyllead in ethanol were measured and combined with other literature data of spherical solutes in various solvents to study the effects of solvent on diffusivity. A new fractional molecular-hydrodynamic relation is found to well represent the solvent dependence for the diffusivities of carbon tetrachloride, tetramethyltin, tetraethyltin, tetrapropyltin, and tetrabutyltin at diverse temperatures. The relation consists of two components: one is a function of the hydrodynamic viscosity and the other associated with the molecular properties of solvent. Each has a fractional exponent dependent on solute size. The results here indicate that the relative importance of the viscosity component consistently increases with solute size, but that the trend for the molecular component is reversed. Comparison with other diffusion relations reveals that the newly developed model is more applicable and accurate for expressing the effects of solvent on diffusivity.
ISSN: 0301-0104
EISSN: 1873-4421
DOI: 10.1016/j.chemphys.2016.01.008
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