Citation: Yi Jian CHEN, Gui Ying XU, Shi Ling YUAN, Hai Ying SUN. Dynamic Study of Gemini Surfactant and Single-chain Surfactant at Air/Water Interface[J]. Chinese Chemical Letters, ;2005, 16(5): 688-690. shu

Dynamic Study of Gemini Surfactant and Single-chain Surfactant at Air/Water Interface

1.
Key Lab for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100;
2.
Institute of Theoretical Chemistry, Shandong University, Jinan 250100;
3.
Department of Chemical Engineering, Shandong Institute of Light Industry, Jinan 250100

Received Date: 21 May 2004

Fund Project: The authors gratefully acknowledge financial support from Key Technologies R&D Program Foundation of China (02BA312B07), the National Natural Science Foundation of China (No. 20303011) and Natural Science Foundation of Shandong Province (Y2001B08).

Molecular dynamics (MD) simulation are used to study the properties of gemini surfactant of ethyl-α,ω-bis(dodecyldimethylammonium bromide) (C₁₂C₂C₁₂) and dodecyltrimethylammonium bromide (DTAB) at the air/water interface, respectively. In the two systems,the surfactant concentrations are both 28 wt.%, and other conditions are also the same. After reaching the thermodynamic equilibrium, the concentration profiles, the radial distributions functions (RDF) and the mean squared displacement (MSD) are investigated. Theresults reveal that the surface activity of C₁₂C₂C₁₂ suffactant is higher than DTAB surfactant.
- Molecular dynamics simulation,
- gemini surfactant,
- air/water interface
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