Existence of a size-dependent diffusivity maximum for uncharged solutes in water and its implications

Article Abstract:

The importance of the existence of a size dependent maximum for an unchanged solute in liquid or amorphous solid water and its relation to the ionic conductivity maximum in water is discussed. It is found that a maximum self-diffusivity exists as a function of the size of solute diffusing within water at low temperatures but not at high temperatures and this is due to the relatively weak interactions between the solute and the water compared to the kinetic energy at RT, supporting the view that the size-dependent maximum seen for ions in water has its origin in the levitation effect.

Analysis, Water, Solution (Chemistry), Solutions (Chemistry), Levitation

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Size-dependent maximum in ion conductivity: The levitation effect provides an alternative explanation

Article Abstract:

An alternative explanation of the size-dependent maximum in ion mobility in water in terms of the levitation effect is proposed, which accounts for the observed size-dependent maximum in the ion mobility of guest diffusion in porous media. As in the levitation effect, the friction coefficient, the potential energy fluctuations, and the activation energy are found to be minima for particles with maximum self diffusivities similar to the guest diffusion in zeolites.

Electric properties, Electrical conductivity, Charge transfer

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Levitation effect: Distinguishing anomalous from linear regime of guests sorbed in zeolites through the decay of intermediate scattering function and wavevector dependence of self-diffusivity

Article Abstract:

The intermediate scattering function for a particle from linear regime (LR) and anomalous regime (AR) in zeoloite faujasite is discussed. A particle from LR exhibits a bioexponential decay while a particle from AR exhibits a single-exponential decay at small wavevector (k) and the variation with k of the full width at half-maximum of the self-part of the dynamic structure factor is nonmonotonic for a particle in the linear regime.

Chemical reactions

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