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Role of uncrosslinked chains in droplets dynamics on silicone elastomers

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Abstract

We report an unexpected behavior in wetting dynamics on soft silicone substrates: the dynamics of aqueous droplets deposited on vertical plates of such elastomers exhibits two successive speed regimes. This macroscopic observation is found to be closely related to microscopic phenomena occurring at the scale of the polymer network: we show that uncrosslinked chains found in most widely used commercial silicone elastomers are responsible for this surprising behavior. A direct visualization of the uncrosslinked oligomers collected by water droplets is performed, evidencing that a capillarity-induced phase separation occurs: uncrosslinked oligomers are extracted from the silicone elastomer network by the water–glycerol mixture droplet. The sharp speed change is shown to coincide with an abrupt transition in surface tension of the droplets, when a critical surface concentration in uncrosslinked oligomer chains is reached. We infer that a droplet shifts to a second regime with a faster speed when it is completely covered with a homogeneous oil film.

Graphical abstract: Role of uncrosslinked chains in droplets dynamics on silicone elastomers

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Publication details

The article was received on 03 Mar 2017, accepted on 05 Apr 2017 and first published on 06 Apr 2017


Article type: Paper
DOI: 10.1039/C7SM00447H
Citation: Soft Matter, 2017, Advance Article
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    Role of uncrosslinked chains in droplets dynamics on silicone elastomers

    A. Hourlier-Fargette, A. Antkowiak, A. Chateauminois and S. Neukirch, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00447H

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