Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 509, Issue -, Pages 130-139Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2016.08.089
Keywords
Gemini surfactant; Synthesis; Ester group; Dynamic surface tension; Adsorption
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Funding
- National Natural Science Foundation of China [21076135, 21206103]
- Key Project of Science and Technology of Shanxi [20140321018-05]
- Shanxi Province Natural Science Foundation [2015011023]
- Projects of Science and Technology of Jincheng [201501004-15]
- Key Laboratory of Road Structure& Material of Transport (Beijing) [KF201403]
- Foundation of Shanxi Province Key Laboratory of Surfactant [201503]
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Two series of quaternary ammonium salt Gemini surfactants with ester groups (n-m-n, where n represents hydrocarbon chain lengths of 10, 12, 14 and 16, m represents spacer group lengths of 2 and 6) were synthesized and characterized by H-1 NMR. Surface activity and adsorption of these cationic Gemini surfactants were investigated by methods of measuring equilibrium surface tension and dynamic surface tension. The critical micelle concentration (CMC) decreased with an increase in chain length, while increased with the length of spacer group. Moreover, data obtained were analyzed in accordance with Word-Tordai equation, and the diffusion coefficients for ionic liquid molecular adsorption in the initial stage and final stage under different concentration were figured out respectively. The results indicated that the adsorption process was controlled by a diffusion step at low surfactant concentration while by a mixed kinetic-diffusion adsorption mechanism at high surfactant concentration. (C) 2016 Elsevier B.V. All rights reserved.
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