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231225s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.7b02651
|2 doi
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|a pubmed25n0924.xml
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|a eng
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|a Fameau, Anne-Laure
|e verfasserin
|4 aut
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|a Morphological Transition in Fatty Acid Self-Assemblies
|b A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds
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|c 2017
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 31.07.2018
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|a Date Revised 31.07.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a In surfactant systems, the major role of the nature of the counterion in the surfactant behavior is well-known. However, the effect of the molar ratio between the surfactant and its counterion is less explored in the literature. We investigated the effect of the molar ratio (R) between 12-hydroxystearic acid (12-HSA) and various alkanolamines as a function of the temperature in aqueous solution from the molecular scale to the mesoscale. By coupling microscopy techniques and small-angle neutron scattering, we showed that 12-HSA self-assembled into multilamellar tubes and transitioned into micelles at a precise temperature. This temperature transition depended on both the molar ratio and the alkyl chain length of the counterion and could be precisely tuned from 20 to 75 °C. This thermal behavior was investigated by differential scanning calorimetry and wide-angle X-ray scattering. We highlighted that the transition at the supramolecular scale between tubes and micelles came from two different mechanisms at the molecular scale as a function of the molar ratio. At low R, with an excess of counterion, the transition came from the chain-melting phenomenon. At high R, with an excess of 12-HSA, the transition came from both the chain-melting process and the surface-melting process of the hydrogen bonds. At the mesoscale, this transition of supramolecular assemblies from tubes to micelles delimited a regime of high bulk viscosity, with a regime of low viscosity
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|a Journal Article
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|a Cousin, Fabrice
|e verfasserin
|4 aut
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|a Saint-Jalmes, Arnaud
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 33(2017), 45 vom: 14. Nov., Seite 12943-12951
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
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|g volume:33
|g year:2017
|g number:45
|g day:14
|g month:11
|g pages:12943-12951
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|u http://dx.doi.org/10.1021/acs.langmuir.7b02651
|3 Volltext
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