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Citation link: https://doi.org/10.26092/elib/2510

Publisher DOI: https://doi.org/10.1002/cjce.23578
L. Luhede, T. Wollborn, U. Fritsching, Stability of multiple emulsions under shear stress_ 2019_ accepted version_Deckblatt_pdfa1.pdf
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Stability of multiple emulsions under shear stress


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L. Luhede, T. Wollborn, U. Fritsching, Stability of multiple emulsions under shear stress_ 2019_ accepted version_Deckblatt_pdfa1.pdf3.08 MBAdobe PDFView/Open
Authors: Luhede, Laura 
Wollborn, Tobias 
Fritsching, Udo  
Abstract: 
Multiple liquid emulsions of the water in oil in water (W1/O/W2) type are used in a variety of consumer or technical applications, for instance in the encapsulation of certain active ingredients. The encapsulation process and release mechanisms of the inner phase of the carrier drops are important in order to properly process and formulate such liquid-liquid systems. In this work the stability and breakage of multiple W1/O/W2 emulsions under mechanical shear stress are investigated for emulsions with different surfactants and surfactant concentrations of the internal emulsion. Stressing the emulsions in a mechanical stirring process is compared to the membrane emulsification process. The membrane emulsification process results in higher encapsulation efficiencies than the stirring process. The emulsion droplets were subjected to shear stress below and above the critical capillary number for drop breakup. The results show that stable inner emulsions with sufficient surfactant concentrations increase the overall encapsulation efficiency for multiple emulsions subjected to shear stress, although the effect is not prominent. The depletion of the carrier oil droplets could be achieved for Ca numbers below the critical limit, reducing the encapsulation efficiency below 10 %. This shows that even a low shear stress can result in content release from the internal droplet phase. The experimental emulsion release study is supported by a numerical simulation of drop deformation and break-up under shear stress.
Keywords: multiple emulsion; encapsulation; droplet breakup; emulsion stability; shear stress; Mimenima
Issue Date: 13-Dec-2019
Publisher: Wiley
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: The Canadian Journal of Chemical Engineering 
Issue: 1
Start page: 186
End page: 193
Volume: 98
Type: Artikel/Aufsatz
ISSN: 0008-4034
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2510
URN: urn:nbn:de:gbv:46-elib71905
Institution: Universität Bremen 
Faculty: Zentrale Wissenschaftliche Einrichtungen und Kooperationen 
Institute: Institut für Werkstofftechnik (IWT) 
Appears in Collections:Forschungsdokumente

  

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