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|a 10.1021/la2025846
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|a eng
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|a Hatzopoulos, Marios Hopkins
|e verfasserin
|4 aut
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|a Are hydrotropes distinct from surfactants?
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|c 2011
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|a Text
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|a ƒaComputermedien
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|a Date Completed 14.02.2012
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|a Date Revised 11.10.2011
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2011 American Chemical Society
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|a The physicochemical properties of a homologous series of sodium p-n-alkylbenzoates have been investigated. The objective was to determine whether there is a clear transition point from hydrotropic to surfactant-like behavior with increasing alkyl chain length n, so as to shed clear light on the aggregation mechanism of so-called "hydrotropes". Electrical conductivity measurements were used for a first estimation of the critical aggregation concentrations (cac). As for classical surfactants, log(cac) depends on alkyl chain length n, but two branches of behavior were observed: one having a gradient typical of long chain fatty acid salts and the other with a more shallow dependence. Surface tension (γ) measurements of high purity aqueous solutions were used to generate limiting headgroup areas A(cac), which were in the range (40-50 Å(2)) being consistent with monolayer formation. Small-angle neutron scattering conclusively shows that the lower chain length homologues (classed as hydrotropes) exhibit sharp transitions in aggregation as a function of bulk concentration, typical of regular surfactants. As such, there is little to suggest from this study that hydrotropes differ in association behavior from regular surfactants
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|a Journal Article
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|a Eastoe, Julian
|e verfasserin
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|a Dowding, Peter J
|e verfasserin
|4 aut
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|a Rogers, Sarah E
|e verfasserin
|4 aut
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|a Heenan, Richard
|e verfasserin
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|a Dyer, Robert
|e verfasserin
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|t Langmuir : the ACS journal of surfaces and colloids
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|g 27(2011), 20 vom: 18. Okt., Seite 12346-53
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|g day:18
|g month:10
|g pages:12346-53
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|u http://dx.doi.org/10.1021/la2025846
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