Dynamic Surface Tension and Adsorption Mechanism of Surfactant Benzyltrimethylammonium Bromide at the Air/Water Interface |
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| Authors: | Yanhong Gao Jinling Chai Jun Xu Gaoyong Zhang |
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| Affiliation: | 1. Department of Chemistry , Shandong Normal University , Jinan, China;2. Key Laboratory of Colloid and Interface Chemistry, Ministry of Education , Shandong University , Jinan, China;3. China Research Institute of Daily Chemical Industry , Taiyuan, China |
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| Abstract: | ![]()
The air‐solution equilibrium tension, γc and dynamic surface tension, γt, of aqueous solutions of a novel ionic surfactant benzyltrimethylammonium bromide (BTAB) were measured by Wilhelmy method and Maximum bubble pressure method (MBPM), respectively. Adsorption equilibrium and mechanism of BTAB at the air‐solution interface were studied. The CMC was determined to be 0.11 mol/L. The results show that at the start, the adsorption process is controlled by a diffusion step. Toward the end, it changes to a mixed kinetic‐diffusion controlled mechanism with the adsorption activation energy of about 11.0 KJ/mol. Effects of temperature, inorganic salts, and alcohols on adsorption kinetics also are discussed. |
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| Keywords: | Dynamic surface tension adsorption mechanism benzyltrimethylammonium bromide |
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