Adsorption equilibrium and kinetics of alkyl polyglucoside on the air/water interface

The air-solution equilibrium (gamma(e)) and dynamic surface tensions[gamma(t)] were measured by Wilhelmy method and maximum bubble pressure method (MBPM), respectively, of alkyl polyglucoside (APG) aqueous solution C(9.6)G(1.3). The adsorption equilibrium and kinetics of APG on the air-solution interface were studied. The CMC of APG was determined to be 0. 032 g/L. The above results show that at the start , the adsorption process is controlled by a diffusion step; Then it changes to a barrier control mechanism with a adsorption barrier between 4 and 7 kJ/mol. The effects of temperature, inorganic salts and alcohols on the adsorption equilibrium and kinetics were also discussed.