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Citation: LIU Jin-Yan, GUO Gui-Bao, WANG Zheng-De, AN Xiao-Ping. Kinetics of Adsorption of Gemini Surfactant C₁₂-2-C₁₂·2Br at Air-Water Interface[J]. Chinese Journal of Applied Chemistry, ;2008, 25(8): 937-942. shu

Kinetics of Adsorption of Gemini Surfactant C₁₂-2-C₁₂·2Br at Air-Water Interface

1.
a School of Biology and Chemical Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia, Baotou 014010;
2.
b College of Animal Science and Animal Medicine, Inner Mongolia Agriculture University, Inner Mongolia, Huhehaote

Corresponding author: LIU Jin-Yan,
Received Date: 20 August 2007
Available Online: 21 November 2007
Fund Project: 内蒙古科技厅攻关计划项目(20010808) (20010808)内蒙古科技大学基金资助项目(00605303) (00605303)

Adsorption kinetics of Gemini surfactant C₁₂-2-C₁₂·2Br at the water-air interface was studied by maxium bubble pressure technique. The diffusion rate was enhanced when the bulk concentration increased, and the diffusion coefficient D increased accordingly. The diffusion coefficient D of C12-s-C12·2Br was almost 100 times larger than that for its monomer, dodecyltrimethyl-ammonium bromide(DTAB), due to its higher hydrophobicity resulting from different structures of the two surfactants. The adsorption at long period of time followed a kinetic-diffusion adsorption mechanism, and the adsorption barrier E_a was obtained. The E_a values of C₁₂-2-C₁₂·2Br and DTAB were 17.29 and 9.13 kJ/mol, respectively. The C₁₂-2-C₁₂·2Br exhibited greater surface pressure, fraction of coverage at the air-water interface, and molecular head group area than DTAB, which led to the larger E_a of C₁₂-2-C₁₂·2Br.
- adsorption kinetics,
- Gemini surfactant,
- diffusion coefficient,
- adsorption barrier
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Kinetics of Adsorption of Gemini Surfactant C12-2-C12·2Br at Air-Water Interface

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Kinetics of Adsorption of Gemini Surfactant C₁₂-2-C₁₂·2Br at Air-Water Interface