Determination of the concentration dependence of polyelectrolyte diffusion coefficients by application of the Boltzmann gradient method

Composition dependent transport diffusion in non-ideal mixtures from spatially resolved nuclear magnetic resonance spectroscopy

“…It allows for the determination of the Fick diffusion coefficient of a liquid mixture in the entire composition range with a single experimental run if a varying spatial distribution of composition can be measured over time with a resolution that is sufficient for fitting a diffusion model to these data. A similar strategy has successfully been employed to gain insight about absorption 19 as well as transport in anionic gels 20 and polyelectrolytes 21 . Moreover, the corresponding data can be used to discriminate models, such as in the incremental-model approach proposed by Bardow and coworkers.…”

Direct determination of the concentration dependence of diffusivities using combined model-based Raman and NMR experiments

“…In later reviews on measurements of diffusion coefficients [2,6] the possibility of the direct measurement of concentration-dependent diffusivities was not mentioned any more despite its prospect of substantially reducing the experimental efforts. These prospects, however, have lead to a recent renaissance of the idea with first examples in other fields such as adsorption [7], transport in anionic gels [8], drying processes [9] and polyelectrolyte diffusion [10].…”