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231224s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.6b04160
|2 doi
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|a eng
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| 100 |
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|a Sihler, Susanne
|e verfasserin
|4 aut
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| 245 |
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|a Dye Aggregates as New Stabilizers for (Mini)emulsions
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|c 2017
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 18.04.2018
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|a Date Revised 18.04.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Water-soluble organic dyes such as fluorescein are widely used, mainly for coloration of, e.g., biological samples and groundwater tracing, and they are not obviously amphiphilic by molecular structure like surfactants. Here, we show that the dyes alone stabilize oil-in-water emulsions. Exemplarily, fluorescein is compared with the classical surfactant sodium dodecyl sulfate (SDS) by means of surface/interfacial tension, concentration of stabilizer and electrolyte, as well as pH. The principle can be extended to further classes of water-soluble dyes, which keep up with or exceed SDS by efficiency. Various organic liquids of different polarities can be employed and be polymerized in the case of styrene as disperse phase. Thus, surfactant free latex solely stabilized by water-soluble dyes is accessible. The emulsions can be destabilized by absorption of the dyes to hydrogels, and their complete removal is easily followed visually. The stabilization mechanisms are different for SDS and the dyes: The latter stabilize droplets not as monomers but by their aggregates as molecular scale Pickering stabilizers, which is a new concept of stabilization
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Ziener, Ulrich
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 33(2017), 5 vom: 07. Feb., Seite 1239-1247
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|g month:02
|g pages:1239-1247
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|u http://dx.doi.org/10.1021/acs.langmuir.6b04160
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