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Issue 41, 2017
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Capillary induced twisting of Janus cylinders

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At the appropriate length scales, capillary forces exerted by a liquid in contact with a compliant solid can cause the solid's deformation. Capillary forces are also able to align particles with discrete wettabilities – or Janus particles – at liquid interfaces. Their amphiphilic properties enable Janus particles to orient themselves at liquid interfaces such that both of their surfaces are facing their preferred fluid. However, it is unclear how to spontaneously obtain varying degrees of rotational alignment. Here we extend ideas of elasto-capillarity to modulate rotational alignment by connecting amphiphilic Janus cylinders in an antisymmetric configuration. As the Janus cylinders rotate they cause a twisting deformation of rod. We develop both a mathematical model and a physical macroscale setup to relate the angle of twist to the elastic and interfacial properties, which can be used to tune the extent of alignment of Janus particles at air–water interfaces. We additionally extend our analysis to calculate the twist profile on a compliant element with a distributed capillary torque.

Graphical abstract: Capillary induced twisting of Janus cylinders

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Publication details

The article was received on 30 Jun 2017, accepted on 13 Sep 2017 and first published on 03 Oct 2017

Article type: Paper
DOI: 10.1039/C7SM01288H
Citation: Soft Matter, 2017,13, 7556-7561
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    Capillary induced twisting of Janus cylinders

    A. T. Oratis, T. P. Farmer and J. C. Bird, Soft Matter, 2017, 13, 7556
    DOI: 10.1039/C7SM01288H

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