期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 653, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.130035
关键词
Anionic surfactants; Isomeric; Dilational elasticity; Dilational viscosity; Interface; Surface
资金
- CAFUC foundation [XSB2022-075, ZJ2022-003, JG2022-27]
- Sichuan Province Engineering Technology Research Center of General Aircraft Maintenance [GAMRC2021YB08]
- Sichuan University Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Open Foundation [2020FMSCU02]
The dilational properties of two anionic surfactants at the air-water and decane-water interfaces were investigated. The effects of aging time, oscillating frequency, bulk concentration, and surface/interfacial pressure were explored. The results show that different processes control the properties of surface/interfacial films at low and high concentrations. The insertion of oil molecules disrupts the interactions between alkyl chains and affects the dilational properties.
The dilational properties of two anionic surfactants 5-6-4 and 5-6-t4 (2, 5-dialkyl benzene sulfonates) at the air-water and decane-water interfaces were investigated using the drop shape analysis method. The effects of aging time, oscillating frequency, bulk concentration, and surface/interfacial pressure on the dilational elasticity and dilational viscosity were explored. The results show that the slow process and diffusion exchange process control the nature of surface/interfacial films at low and high concentrations, respectively. At low concentrations, the strong interaction between the branched long alkyl chains dominates at the surface. At high concentrations, the surface elasticity of 5-6-4 is higher because of the slower diffusion-exchange process. The insertion of oil molecules disrupts the interactions between branched long alkyl chains and simultaneously enhances the diffusion-exchange process, resulting in lower maximum interfacial dilational elasticity and viscosity for both 5-6-4 and 5-6-t4 molecules. The rigid isobutyl group endows the 5-6-t4 molecule with higher dilational elasticity and viscosity at the interface.
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