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Drying kinetics of water droplets stabilized by surfactant molecules or solid particles in a thin non-volatile oil layer

Abstract

We have investigated drying of water droplets stabilized by solid particles or surfactant molecules in a thin oil layer. The surfactant-stabilized droplets isotropically shrink, whereas the droplets stabilized by spherical particles severely deform during drying because of buckling of the particulate shells. However, buckling of the shells hardly affects droplet drying. The drying times for complete evaporation are almost the same for water droplets with the same initial diameter and the drying time is independent of the type of surface stabilizer (particles or surfactant). The drying kinetics of the water droplets is well described by mathematical models, in which diffusion of water molecules in the oil phase to the oil–air interface is proposed as the rate-determining process. Droplets with a diameter comparable with the thickness of the oil layer shrink faster than small droplets because of the short diffusion length from the water droplets to the oil–air interface. We also investigated drying of water droplets stabilized by plate-like mica particles. The droplets also buckled but larger shells of mica particles remained compared with those of spherical particles. In addition, a longer drying time is necessary for some droplets stabilized by mica particles. These results indicate the possible effect of the particle morphology on the buckling and drying kinetics of particle-stabilized water droplets.

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Publication details

The article was received on 05 Oct 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7SM01989K
Citation: Soft Matter, 2017, Accepted Manuscript
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    Drying kinetics of water droplets stabilized by surfactant molecules or solid particles in a thin non-volatile oil layer

    H. Miyazaki and S. Inasawa, Soft Matter, 2017, Accepted Manuscript , DOI: 10.1039/C7SM01989K

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