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Citation: Zhang Zhi-Qing, Xu Gui-Ying, Ye Fan, Zheng Li-Qiang, Luan Yu-Xia. Surface Activity of Mixed System of Dodecyl Betaine and Sodium Dodecyl Sulphate[J]. Acta Physico-Chimica Sinica, ;2001, 17(12): 1122-1125. doi: 10.3866/PKU.WHXB20011213 shu

Surface Activity of Mixed System of Dodecyl Betaine and Sodium Dodecyl Sulphate

1.
Key Laboratory for Colloid and Interface Chemistry of Education Ministry,Shandong University, Jinan　250100

Received Date: 7 May 2001
Available Online: 15 December 2001

The ability of forming micell, the efficiency and the ability of reducing surface tension by the interaction of zwitterionic and anionic surfactants (C12H25N＋(CH3)2 CH2COO－/C12H25SO4Na) has been investi- gated. It is found that when the molar fraction of C12BE is about 0.6, the surface activity shows a maximum. The influence of NaCl and alcohols on surface properties of the mixed system has also been studied. The surface activity is enhanced and the cmc value of C12BE/SDS system is reduced with the increase of NaCl concentration, because sodium ions induce a decrease of electrostatic repulsion between hydrophilic groups in surfactant molecules. The effect is more complex with the addition of alcohols, the surface activity improves with increasing the volume fraction of n-butanol. But no remarkble influence on surface activity has been observed for alcohols of short chain, for example ethanol.
- Dodecyl betaine(C₁₂BE);Sodium dodecyl sulphate(SDS);Critical micell concentration (cmc);Surface tension;Synergism
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