期刊
LANGMUIR
卷 37, 期 29, 页码 8866-8875出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c01277
关键词
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资金
- Strategic Environmental Research and Development Program (SERDP) [WP18-1215]
- U.S. Department of Education GAANN Fellowship
- Charles C. Chappelle Fellowship from Purdue University
The study found that NaCl concentration in saltwater environments promoted spontaneous emulsification of the SDBS-toluene system, with an increase in spontaneity as NaCl concentration increased. NPE and SDBS surfactants emulsified through different mechanisms, and HLD calculations could model spontaneous emulsification conditions effectively.
Spontaneous emulsification of toluene with nonylphenol polyethoxylate (NPE) and sodium dodecylbenzenesulfonate (SDBS) surfactants in saltwater environments was studied. NaCl promoted the spontaneous emulsification of an otherwise non-spontaneous SDBS-toluene system. Dynamic light scattering and turbidity indicated that spontaneity increased with NaCl concentration. The mechanism of spontaneous emulsification was dependent on surfactant type; NPE emulsified via micelle swelling, and SDBS emulsified via nucleation and growth. Hydrophilic lipophilic difference (HLD) calculations were used to model spontaneous emulsification and spontaneity. As HLD approached zero, conditions became more favorable for spontaneous emulsification. Between HLD values of -2.4 and -2.05, samples transitioned from non-spontaneous to spontaneous. This study aids in predicting spontaneous emulsion formation in saltwater environments for applications in nanoemulsion formation and wastewater remediation.
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