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- Title
Effect of temperature on interfacial tensions of extended surfactants.
- Authors
XU Jian-guo
- Abstract
To deeply understand the mechanism responsible for lowering interfacial tension (IFT) of extended surfactant, the interfacial tension between extended surfactant and n-alkanes has been investigated by spinning drop method. The effects of temperature on the ability of extended surfactant to reduce interfacial tensions under different salinity was investigated. The experimental results show that the size of hydrophobic group of extended surfactant molecule becomes larger because of containing polypropylene oxide(PO) groups, and its ability to reduce interfacial tension is strong,which results in its IFTs with octane reaches 0.01 mN/m order of magnitude. Under the condition of low salinity, an increase of temperature generally causes an increase in the size of hydrophobic group, which results in a decrease of IFT and IFT values reduce an order of magnitude when temperature increases from 30 °C to 90 °C. The extended surfactant can lower interfacial tension to ultra-low value against oil phase with optimum carbon number under high salinity because a rise in salinity usually results in a decrease in the size of head group. In this case, the increase of temperature will adjust the hydrophilic-lipophilic balance of the extended surfactant, which has little effect on the minimum value of the interfacial tension.
- Subjects
INTERFACIAL tension; TEMPERATURE effect; SURFACE active agents; POLYPROPYLENE oxide; MAGNITUDE (Mathematics); MOLECULAR size; WATER salinization; SURFACE tension
- Publication
Journal of Tiangong University, 2021, Vol 40, Issue 5, p49
- ISSN
1671-024X
- Publication type
Article
- DOI
10.3969/j.issn.1671-024x.2021.05.008