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Issue 40, 2017
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Wrinkled labyrinths in critical demixing ferrofluid

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Abstract

A thin film of a critical ferrofluid mixture undergoes a sequence of transitions in a magnetic field. First the application of a field induces a critical demixing of the fluid into cylindrical droplets of the minority phase immersed in an extended majority phase. At a second critical field the cylindrical shape is destabilized and transforms into a labyrinth pattern. A third wrinkling transition occurs at even higher field if the liquid has a liquid/air interface. The wrinkling is absent if the droplet has a cover-slide on top. We explain the wrinkling by the wetting behavior of the liquid/air interface that shifts the surface region away from a critical demixing point.

Graphical abstract: Wrinkled labyrinths in critical demixing ferrofluid

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Publication details

The article was received on 25 Jul 2017, accepted on 19 Sep 2017 and first published on 20 Sep 2017


Article type: Paper
DOI: 10.1039/C7SM01475A
Citation: Soft Matter, 2017,13, 7307-7311
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    Wrinkled labyrinths in critical demixing ferrofluid

    N. Wilke, J. Bugase, L. Treffenstädt and T. M. Fischer, Soft Matter, 2017, 13, 7307
    DOI: 10.1039/C7SM01475A

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