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Citation: LI Jia-Cheng, QIU Xue-Qing, FENG Yu-Hong, LIN Qiang. Effects of Pure and Mixed Surfactants on Bifenthrin Microemulsion[J]. Chinese Journal of Applied Chemistry, ;2008, 25(8): 890-894. shu

Effects of Pure and Mixed Surfactants on Bifenthrin Microemulsion

1.
a School of Chemical and Energy Engineering, South China University of Technology, Guangzhou;
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b Key Laboratory of Tropic Biological Resource of Chinese Education Ministry, Haian University, Haikou 570228

Corresponding author: LIN Qiang,
Received Date: 19 August 2007
Available Online: 29 December 2007
Fund Project: 国家高技术研究发展计划("八六三"计划)(2002AA302212) ("八六三"计划)(2002AA302212)海南省自然科学基金(80608)资助项目 (80608)

The critical micelle concentration(CMC) and surface tension of several different types of surfactants and their mixtures were measured in the system with water as continuous medium and cyclohexanone as solvent. Their effects on phase behavior and physical stability of 2.5% bifenthrin microemulsion were investigated in detail. Among several pure surfactants, the CMC of triphenylphenoxy polyoxyethylenyl polyoxypro-pylene(EPE type) with block nonion surfactant stucture is the lowest, γ_cmc=28.18 mN/m. The CMC of a mixture of EPE and SDBS [m(EPE):m(SDBS)=2:1] is 27.60 mN/m, which is further lower than that of pure EPE. This is very helpful to form O/W type microemulsion. When the dosage of the mixture was about 10%, the heat storage decomposition rate of 2.5% bifenthrin microemulsion was 2.35%.
- surfactant,
- microemulsion,
- phase behavior,
- stability
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