Diffusion coefficient

The structural, selective and electrokinetic characteristics and percolation parameters were determined for different ion-exchange polymer membranes from their conductivity data using the two-phase model of membrane conductivity and percolation theory. The two different combinations of micro-phases

A comparison of the electrochemical and elastic parameters determined for three dense regenerated cellulose (RC) membranes with different cellulose content is presented in this work. Different values for structural (fractional void volume), electrical (fixed charge concentration and ion transport nu

Correlations between positron annihilation lifetime spectroscopy (PALS) measurement and diffusivities in polymer solutions were established, with the help of the Simha–Somcynsky (SS) equation-of-state (EOS) and the free-volume theory. Mean hole volume probed by PALS was employed to predict the free

It can be expected that a microwave acts as an accelerator of the mobility of polar functional groups such as hydroxyl groups in polymeric membranes, and then gas permeability improves because of the increasing free volume and/or temperature of the membranes. The permeability coefficients of CO2 for