Analysis of the pH-Sensitive Swelling Rate of a Polyelectrolyte Complex Gel Prepared from Xanthan and Chitosan by the Collective Diffusion Model

Development of a Model for Analyzing the Swelling Rate of Ionic Gels on the Basis of the Diffusion of Mobile Ions: Application to the pH-Sensitive Swelling of a Polyelectrolyte Complex Gel Prepared from Xanthan and Chitosan

“…9 ) As a result, the swelling rate of the gel was quantitatively described for a high pH value by using information on swelling equilibria. In the preceding work, 8) we showed that the time-course of swelling for the xanthan/chitosan complex gel in a solution at pH 10 after previous equilibration at pH 11 was apparently described by the collective diffusion model. However, the value for collective diffusion coefficient Dgel was different from that of cooperative diffusion coefficient Dcoop by dynamic light scattering measurements by about 4 orders of magnitude.…”

“…In the preceding work, 8) we applied the collective diffusion model to the pH-sensitive swelling of an amphoteric, xanthanjchitosan complex gel, the electrolyte behavior of which had already been clarified in swelling equilibria. 9 ) Although the course of swelling was apparently described by the collective diffusion model, the value for collective diffusion coefficient Dge\ was larger than that of cooperative diffusion coefficient Dcoop by about 4 orders of magnitude.…”

Electrically induced swelling and methylene blue release behaviour of poly (N-isopropylacrylamide-co-acrylamido-2-methylpropyl sulphonic acid) hydrogels

“…Tanaka and Fillmore theory based on collective diffusion model, which well reproduces the swelling phenomena in one axis, such as spherical gels. But it cannot reproduce the swelling phenomena in two and three axes and also not able to describe satisfactorily the swelling phenomena based on the diffusion of mobile ions in the hydrogels [43]. The diffusion coefficient (D) of hydrogel samples in deionized water was calculated by using Eq.…”

Chitosan-Polyelectrolyte complexation for the preparation of gel beads and controlled release of anticancer drug. I. Effect of phosphorous polyelectrolyte complex and enzymatic hydrolysis of polymer

“…Chitosan has also been used for the preparation of nontoxic polyelectrolytecomplex products with natural polyanions such as carboxymethylcellulose, alginic acid, dextran sulfate, heparin, xanthan etc., for the immobilization and release of drugs or proteins. [17][18][19][20][21][22][23][24] The polyelectrolyte complex was prepared by the formation of complexes from the interaction of oppositely charged polyelectrolytes. The mechanism of polyelectrolyte complexes can be varied by changing the chemical structure of component polymers, such as molecular weight, flexibility, functional group structure, charge density, stereoregularity, and compatibility, as well as reaction conditions: pH, ionic strength, concentration, mixing ratio, and temperature.…”