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Strengthening and drying rate of a drying emulsion layer

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Abstract

From direct observations and MRI measurements we demonstrate that during the drying of a direct (oil in water) emulsion the whole system essentially concentrates homogeneously, which leads to shrinkage, without air penetration. The structure and mechanical strength (i.e. the elastic modulus) of this concentrated bulk are not significantly different from those of an emulsion directly prepared at this higher concentration. Despite this phenomenon, the drying rate continuously and rapidly decreases as the water content decreases, in contrast with the drying of a simple granular packing. This results from a concentration gradient which develops towards the free surface of the sample where the oil droplets finally coalesce, ultimately forming an oil layer covering the sample through which the water molecules have to diffuse before evaporating. Moreover, as during the process, the liquid is transported towards the free surface where it evaporates, surfactants accumulate and tend to form a thin solid layer below the oil layer, which tends to further reduce the drying rate.

Graphical abstract: Strengthening and drying rate of a drying emulsion layer

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Publication details

The article was received on 21 Jul 2018, accepted on 01 Oct 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01490F
Citation: Soft Matter, 2018, Advance Article
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    Strengthening and drying rate of a drying emulsion layer

    M. Goavec, S. Rodts, V. Gaudefroy, M. Coquil, E. Keita, J. Goyon, X. Chateau and P. Coussot, Soft Matter, 2018, Advance Article , DOI: 10.1039/C8SM01490F

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