M. Ciszkowska et Md. Guillaume, Transport of ions and molecules in biopolymeric gels: Electroanalytical studies, J PHYS CH A, 103(5), 1999, pp. 607-613
Transport of ions and molecules was studied in hydrogels of uncharged and a
nionic biopolymers, agarose, and i-carrageenan. Diffusion coefficients of n
eutral and ionic electroactive probes, the uncharged radical 2,2,6,6-tetram
ethyl-1-pipperidinyloxy, TEMPO, and T1(+), were determined rapidly and prec
isely from steady-state, transport-limited currents at platinum and mercury
microelectrodes. Transport properties of both probes were studied in gels
as affected by temperature, ionic strength, and concentration of the biopol
ymer, and they were compared with those in solutions. The relation between
macroscopic and local microscopic viscosity of biopolymeric gels was analyz
ed based on viscosity measurements and diffusion coefficient data.