Transport coefficients: a path to explorate convex (colloidal and polyelectrolyte solutions) and concave (clays, porous media) systems
Pierre Turq
Transport coefficients such as electrical mobilities or diffusion coefficients can be measured on a collective or on an individual basis; bulk electrolyte or single ion conductivities, collective or individual diffusion coefficients.
We determine transport coefficients of different colloidal and micellar systems, as well as natural polyelectrolytes such as soil natural organic matter, by several experimental methods: electrical conductance, electrophoretic mobilities (optic and acoustic zetametry), diffusion coefficients: individual by NMR, collective by dynamic light scattering.
The results can be compared to the predictions of different mesoscopic theoretical models , such as MSA dynamic and brownian dynamics. In any case counterion condensation is a major factor which has to be taken in to account for a proper quantitative description of the system.
Analogous results can be inferred for concave media.
References
- G.M. Roger, S. Durand Vidal, O. Bernard, P. Turq, T.M. Perger and M. Bester Rogac J. Phys. Chem. B, 2008, 112, 16529-16538