Effect of electrolyte concentration on the dynamic surface tension and dilational viscoelasticity of adsorption layers of chitosan and dodecyl chitosan

The Journal of Physical Chemistry. B
Valery G BabakM Rinaudo


The effect of an external salt (AcONa) on the kinetics of adsorption and structure formation inside the adsorption layers (ALs) of chitosan (Ch) and dodecyl chitosan (C12Ch) as well as on the frequency dependence of the complex dilational elasticity modulus of these layers has been studied. The complex dilational elasticity modulus of adsorption layers of polymers has been measured on the drop tensiometer (Tracker, IT Concept, France) upon applying a small sinusoidal variation of the drop area with a given frequency, omega, in the range from 10(-2) to 0.63 rad/s and recording the variation of the surface pressure. It has been found that, in the absence of the salt, the dilational storage modulus, E'(omega), of ALs of both Ch and C12Ch is lower with regard to the loss modulus, E' '(omega), in the whole range of frequencies used, testifying for the liquidlike rheological behavior of these layers. With an increase of the salt concentration up to CAcONa > 0.1 M, the ALs become solidlike, as shown when E'(omega) > E' '(omega). Consequently, the characteristic frequency, omega c, corresponding to the intercept between the E'(omega) and E' '(omega) curves, gradually varies from omega c > 1 rad/s to omega c < 0.01 rad/s when the salt c...Continue Reading


Jul 1, 1996·International Journal of Biological Macromolecules·J DesbrièresM Rinaudo
Apr 18, 2000·Advances in Colloid and Interface Science·J Eastoe, J S Dalton
Mar 19, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·R MillerM Michel
Sep 13, 2005·Biomacromolecules·M RinaudoI Mullagaliev

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