The defect diffusion model, scaling, EV*/H* and monomer volume and correlation lengths for glass-formers

Bendler, John T.; Fontanella, J. J.; Shlesinger, Michael F.; Wintersgill, M. C.

doi:10.1016/j.jnoncrysol.2010.07.031

Cited by 3 publications

(1 citation statement)

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“…Mass transport in liquids has been studied for over a century. The temperature dependence of mass transport, and specifically viscosity and diffusion, has largely been described from two different perspectives although other models have been recently introduced. , First, Eyring’s transition state theory describes transport as a thermally activated process . Here the liquid is assumed to have a quasicrystalline structure where a liquid molecule is confined in a “cage” of surrounding molecules.…”

Section: Discussionmentioning

confidence: 99%

Molecular and System Parameters Governing Mass and Charge Transport in Polar Liquids and Electrolytes

et al. 2012

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Onsager's model of the dielectric constant is used to provide a molecular-level picture of how the dielectric constant affects mass and charge transport in organic liquids and organic liquid electrolytes. Specifically, the molecular and system parameters governing transport are the molecular dipole moment μ and the solvent dipole density N. The compensated Arrhenius formalism (CAF) writes the temperature-dependent ionic conductivity or diffusion coefficient as an Arrhenius-like expression that also includes a static dielectric constant (ε(s)) dependence in the exponential prefactor. The temperature dependence of ε(s) and therefore the temperature dependence of the exponential prefactor is due to the quantity N/T, where T is the temperature. Using the procedure described in the CAF, values of the activation energy can be obtained by scaling out the N/T dependence instead of the ε(s) dependence. It has been previously shown that a plot of the prefactors versus ε(s) results in a master curve, and here it is shown that a master curve also results by plotting the prefactors against N/T. Therefore, the CAF can be applied by using temperature-dependent density data instead of temperature-dependent dielectric constant data. This application is demonstrated for diffusion data of n-nitriles, n-thiols, n-acetates, and 2-ketones, as well as conductivity data for dilute tetrabutylammonium triflate-nitrile electrolytes.

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Section: Discussionmentioning

confidence: 99%