NDLI: Electrical Conductivity , Near-Infrared Absorption , and Thermal Lens Spectroscopic Studies of Percolation of Microemulsions

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Electrical Conductivity , Near-Infrared Absorption , and Thermal Lens Spectroscopic Studies of Percolation of Microemulsions

Content Provider	Semantic Scholar
Author	Baptista, Maurício S. Tran, Chieu D.
Copyright Year	1997
Abstract	Microemulsions of negatively charged (sodium bis(2-ethylhexyl)sulfosuccinate, AOT) and positively charged (dodecylmethylbutylammonium bromide and benzyldimethylhexadecylammonium chloride) surfactants were studied below and above the percolation thresholds by electrical conductivity, near-infrared absorption, and thermal lens spectrometry. It was found that the AOT microemulsions undergo percolation at a relatively high concentration (about 27% of water (v:v)) and show no variation in the thermal lens effect ( θ/AP0) as a function of water concentration. These results seem to indicate that the AOT microemulsions consist of small reversed micelles, and this structure is the same below and above the percolation threshold. Conversely, for microemulsions prepared with positively charged surfactants, the percolation occurs at relatively low concentration (around 10% of water (v:v)), and also it is in this region that the thermal lens effect (i.e., θ/AP0) as a function of water undergoes changes. It seems that the structure of these positive microemulsions changes concomitantly with the percolation. Specifically, these positive microemulsions form larger interconnected aggregates or bicontinuous structures in solution above percolation threshold concentration.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.marquette.edu/chem/tran/documents/p77.pdf
Language	English
Access Restriction	Open
Subject Keyword	Ahead-of-time compilation Authorized Osteopathic Thesaurus Benzalkonium Chloride 1.3 MG/ML Medicated Liquid Soap Bromides Charge (electrical) Docusate Sodium Electric Conductivity Emoticon Large Percolation threshold Spectrometry methscopolamine bromide
Content Type	Text
Resource Type	Article

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