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Date
1971
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Abstract
The self-diffusion coefficient of benzene has been measured using benzene-1 14C and benzene-1,2 14C tracers. These data are compared with existing data of Birkett and Lyons for the limiting diffusion coefficient of benzene-2H6 in benzene. This comparison shows that the limiting diffusion coefficient of a tracer species is dependent upon the isotopic composition of the tracer. The isotope effect study suggested that a general mass dependence for limiting diffusion data might be found. Limiting diffusion data for 24 homologous series in both polar and non-polar solvents were correlated with the empirical relation D = a +bM^(-1/2) V-bar^(-1/3) (Equation 1) For non-associating solutes in unassociated solvents the value of a was generally small compared to the second term. The value of b was found to depend upon M^(1/2) solvent, V-bar^(1/3) solvent, eta solvent. Equation 1 may be rewritten in the form D= a +b' (M_s^(1/2)V-bar_s^(1/3))/(eta_s M(1/2) V-bar^(1/3)) where the subscript s denotes a solvent property; b' assumes a value of 1 for non-cyclic solvents and a value of 1.5 for cyclic solvent. Associated solvent systems are characterized by higher values of b'. Solute association is characterized by lower values of b' while solvent-solute association leads to high values of a and low values of b'. These generalizations have been used to interpret diffusion data in aqueous systems.
Contents
Subject
Subject(s)
Diffusion
Research Projects
Organizational Units
Journal Issue
Genre
Dissertation
Description
Format
x, 87 leaves, bound : illustrations
Department
Chemistry and Biochemistry