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  Skinny emulsions take on granular matter

Giustiniani, A., Weis, S., Poulard, C., Kamm, P. H., Garcia-Moreno, F., Schröter, M., et al. (2018). Skinny emulsions take on granular matter. Soft Matter, 14(36), 7310-7323. doi:10.1039/c8sm00830b.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-9701-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-9702-1
Genre: Journal Article

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 Creators:
Giustiniani, Anais, Author
Weis, Simon, Author
Poulard, Christophe, Author
Kamm, Paul H., Author
Garcia-Moreno, Francisco, Author
Schröter, Matthias1, Author              
Drenckhan, Wiebke, Author
Affiliations:
1Group Statistical mechanics of granular media, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063310              

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 Abstract: Our understanding of the structural features of foams and emulsions has advanced significantly over the last 20 years. However, with a search for ‘‘super-stable’’ liquid dispersions, foam and emulsion science employs increasingly complex formulations which create solid-like visco-elastic layers at the bubble/ drop surfaces. These lead to elastic, adhesive and frictional forces between bubbles/drops, impacting strongly how they pack and deform against each other, asking for an adaptation of the currently available structural description. The possibility to modify systematically the interfacial properties makes these dispersions ideal systems for the exploration of soft granular materials with complex interactions. We present here a first systematic analysis of the structural features of such a system using a model silicone emulsion containing millimetre-sized polyethylene glycol drops (PEG). Solid-like drop surfaces are obtained by polymeric cross-linking reactions at the PEG–silicone interface. Using a novel dropletmicromanipulator, we highlight the presence of elastic, adhesive and frictional interactions between two drops. We then provide for the first time a full tomographic analysis of the structural features of these emulsions. An in-depth analysis of the angle of repose, local volume fraction distributions, pair correlation functions and the drop deformations for different skin formulations allow us to put in evidence the striking difference with ‘‘ordinary’’ emulsions having fluid-like drop surfaces. While strong analogies with frictional hard-sphere systems can be drawn, these systems display a set of unique features due to the high deformability of the drops which await systematic exploration.

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Language(s): eng - English
 Dates: 2018-07-172018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c8sm00830b
 Degree: -

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Title: Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 14 (36) Sequence Number: - Start / End Page: 7310 - 7323 Identifier: ISSN: 1744-683X
CoNE: https://pure.mpg.de/cone/journals/resource/1744-683X