Equilibrium and dynamic aspects of dodecyltrimethylammonium bromide adsorption at the air/water interface in the presence of lambda-carrageenan.
In this work we present equilibrium and dynamic surface tension together with dilational elasticity data for dodecyltrimethylammonium bromide in the presence of lambda-carrageenan, a sulfated polysaccharide extracted from algae. The critical aggregation concentration and (CAC) and critical micellar concentration CMC of the mixed system were determined and shown to have a direct influence on the elasticity modulus. The behavior of the adsorption kinetics was shown to be dependent on the surfactant to polyelectrolyte charge ratio or excess species in the bulk solution.
Nobre
Thatyane Morimoto
TM
Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil 14040-901.
Wong
Kenneth
K
Zaniquelli
Maria Elisabete Darbello
ME