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《Chinese Journal of Colloid and Polynier》 2002-03
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Study of Cooperative Effect of Mixed System of Zwitterionic and Anionic Surfactants

Zhang Xueqin,Cai Yi,Yang Yajiang (Department of Chemistry, Hua Zhong University of Science and Technology, Wuhan, 430074)  
The formation ability of micelle, the ability of reducing surface tension and foaming performance has been investigated for the mixed system of zwitterionic and anionic surfactant (Lauramidopropyl Betaine / Sodium Dodecyl Sulphate). The optimal surface activity was found when the mass fraction of Lauramidopropyl Betaine was about 3~7. The influence of salts on surface properties and foaming properties for the mixed system has been also studied. It was found that the surface activity was enhanced and the cmc values were reduced in this system. The foamability of this system will be reduced when salts were applied at higher concentration. For instance, surface tension of mixed system (0.0025%) was reduced 1.73 mN / m in the presence of 0.1 mol/L of NaCl. and foamability were increase 7.2% in the presence of 0.17 mol/L of NaCl. Exceptionally foaming properties become worse when the concentration of NaCl was higher than 0.26 mol/L.
【CateGory Index】: O647
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