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Issue 13, 2019
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Microfluidic probing of the complex interfacial rheology of multilayer capsules

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Abstract

Encapsulation of chemicals using polymer membranes enables control of their transport and delivery for applications such as agrochemistry or detergency. To rationalize the design of polymer capsules, it is necessary to understand how the membranes' mechanical properties control the transport and release of the cargo. In this article, we use microfluidics to produce model polymer capsules and study in situ their behavior in controlled divergent flows. Our model capsules are obtained by assembling polymer mono and hydrogen-bonded bilayers at the surface of an oil droplet in water. We also use microfluidics to probe in situ the mechanical properties of the membranes in a controlled divergent flow generated by introducing the capsules through a constriction and then in a larger chamber. The deformation and relaxation of the capsules depend on their composition and especially on the molecular interactions between the polymer chains that form the membranes and the anchoring energy of the first layer. We develop a model and perform numerical simulations to extract the main interfacial properties of the capsules from the measurement of their deformations in the microchannels.

Graphical abstract: Microfluidic probing of the complex interfacial rheology of multilayer capsules

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Publication details

The article was received on 11 Dec 2018, accepted on 02 Mar 2019 and first published on 04 Mar 2019


Article type: Paper
DOI: 10.1039/C8SM02507J
Soft Matter, 2019,15, 2782-2790

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    Microfluidic probing of the complex interfacial rheology of multilayer capsules

    C. Trégouët, T. Salez, C. Monteux and M. Reyssat, Soft Matter, 2019, 15, 2782
    DOI: 10.1039/C8SM02507J

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