Manipulating and quantifying temperature-triggered coalescence with microcentrifugation
| Autor: | Karin Schroën, Huanhuan Feng, Martien A. Cohen Stuart, Jasper van der Gucht, Thomas Krebs, Joris Sprakel, Dmitry Ershov |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Coalescence (physics)
Chemistry droplet formation Laboratorium voor Fysische chemie en Kolloïdkunde Microfluidics Biomedical Engineering Disjoining pressure Bioengineering Nanotechnology General Chemistry emulsions Biochemistry Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter Homogeneous Chemical physics Scientific method Oil phase Emulsion disjoining pressure Physical Chemistry and Soft Matter Food Process Engineering Physical Chemistry and Colloid Science VLAG |
| Zdroj: | Lab on a Chip, 15(1), 188-194 Lab on a Chip 15 (2015) 1 |
| ISSN: | 1473-0197 |
| Popis: | In this paper we describe a new approach to quantify the stability and coalescence kinetics of thermally switchable emulsions using an imaging-based microcentrifugation method. We first show that combining synchronized high-speed imaging with microfluidic centrifugation allows the direct measurement of the thermodynamic stability of emulsions, as expressed by the critical disjoining pressure. We apply this to a thermoresponsive emulsion, allowing us to measure the critical disjoining pressure as a function of temperature. The same method, combined with quantitative image analysis, also gives access to droplet-scale details of the coalescence process. We illustrate this by measuring temperature-dependent coalescence rates and by analysing the temperature-induced switching between two distinct microscopic mechanisms by which dense emulsions can destabilise to form a homogeneous oil phase. |
| Databáze: | OpenAIRE |
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