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Magnetowetting dynamics of sessile ferrofluid drops on soft surface


We investigate the magnetowetting behaviour of sessile ferrofluid droplets on elastomeric surfaces with different stiffness. The non-uniform magnetic field engenders deformation and splitting of the FF droplet, which is greatly influenced by the softness of the substrate. We observe that the decrease in the dynamic contact angle is maximum on the softest substrate, while the contact line remains pinned. Again, for an apparently rigid substrate, the contact radius decreases almost linearly, whereas the decrease in the contact angle appears to be lower than that of soft substrates. The contact line experiences transition from "stick-slip'' on rigid surfaces to "pinned" motion on soft surfaces which is favoured by the formation of a large wetting ridge and smaller receding contact angle on the later. We also find that the splitting time and splitting ratio (the ratio of the volume of the daughter droplet to that of the residual droplet) increases with an increase in the softness of the underlying substrate.

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Publication details

The article was received on 27 Sep 2019, accepted on 04 Dec 2019 and first published on 04 Dec 2019

Article type: Paper
DOI: 10.1039/C9SM01944H
Soft Matter, 2019, Accepted Manuscript

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    Magnetowetting dynamics of sessile ferrofluid drops on soft surface

    B. Sarma, V. Shahapure, A. Dalal and D. N. Basu, Soft Matter, 2019, Accepted Manuscript , DOI: 10.1039/C9SM01944H

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