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  Responsive drop method : quantitative in-situ determination of surfactant effectiveness using reconfigurable Janus emulsions

Djalali, S., Frank, B. D., & Zeininger, L. (2020). Responsive drop method: quantitative in-situ determination of surfactant effectiveness using reconfigurable Janus emulsions. Soft Matter, 16(46), 10419-10424. doi:10.1039/D0SM01724H.

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 Creators:
Djalali, Saveh1, Author              
Frank, Bradley D.1, Author              
Zeininger, Lukas1, Author              
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1Lukas Zeininger, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3179204              

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 Abstract: Characterization of surfactant effectiveness and thus an evaluation of their performance in a wide range of emulsion technologies requires a precise determination of key parameters including their critical micelle concentrations as well as their ability to lower the surface tension at interfaces. In this study, we describe a new approach to quantify marginal variations in interfacial tension of surfactant stabilized fluid interfaces. The method is based on a unique chemical-morphological coupling inside bi-phasic oil-in-water Janus emulsions that undergo dynamic morphological transitions in response to changes in the surfactant type, concentration, ratio, and configuration. Variations in Janus droplet morphologies are readily monitored in-situ using a simple side-view imaging setup, resulting in a fast, convenient, cost-effective, time-, and sample-saving technique for the characterization of classical surfactant systems. In addition, the reported method facilitates a monitoring of triggered changes in surfactant effectiveness, e.g. invoked by external triggers, and thus proves particularly useful for the in-situ analysis of stimuli-responsive surfactants and emulsions.

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Language(s): eng - English
 Dates: 2020-11-022020
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/D0SM01724H
BibTex Citekey: D0SM01724H
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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 16 (46) Sequence Number: - Start / End Page: 10419 - 10424 Identifier: ISSN: 1744-683X