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Research Article

Magnetocontrollable droplet mobility on liquid crystal-infused porous surfaces

Yang Xu1, Yuxing Yao2, Weichen Deng1, Jen-Chun Fang1, Robert L. Dupont1, Meng Zhang1, Simon Čopar3, Uroš Tkalec4,5,6, Xiaoguang Wang1,7( )
William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA
Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
Institute of Biophysics, Faculty of Medicine, University of Ljubljana, 1000 Ljubljana, Slovenia
Department of Physics, Faculty of Natural Sciences and Mathematics, University of Maribor, 2000 Maribor, Slovenia
Department of Condensed Matter Physics, Jožef Stefan Institute, 1000 Ljubljana, Slovenia
Sustainability Institute, The Ohio State University, Columbus, OH 43210, USA
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Graphical Abstract

The dynamics of a droplet on a nematic liquid crystal film can be manipulated by tuning the applied direction and strength of a magnetic field. In contrast, a magnetic field has no effect on the mobility of droplets on isotropic liquid crystal films.

Abstract

Magnetocontrollable droplet mobility on surfaces of both solids and simple fluids have been widely used in a wide range of applications. However, little is understood about the effect of the magnetic field on the wettability and mobility of droplets on structured fluids. Here, we report the manipulation of the dynamic behaviors of water droplets on a film of thermotropic liquid crystals (LCs). We find that the static wetting behavior and static friction of water droplets on a 4’-octyl-4-biphenylcarbonitrile (8CB) film strongly depend on the LC mesophases, and that a magnetic field caused no measurable change to these properties. However, we find that the droplet dynamics can be affected by a magnetic field as it slides on a nematic 8CB film, but not on isotropic 8CB, and is dependent on both the direction and strength of the magnetic field. By measuring the dynamic friction of a droplet sliding on a nematic 8CB film, we find that a magnetic field alters the internal orientational ordering of the 8CB which in turn affects its viscosity. We support this interpretation with a scaling argument using the LC magnetic coherence length that includes (i) the elastic energy from the long-range orientational ordering of 8CB and (ii) the free energy from the interaction between 8CB and a magnetic field. Overall, these results advance our understanding of droplet mobility on LC films and enable new designs for responsive surfaces that can manipulate the mobility of water droplets.

Keywords

liquid crystalslubricated surfacesmagnetic fieldwettabilitydroplet mobility

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Nano Research
Volume 16 Issue 4,
April 2023
Pages 5098-5107
DOI: 10.1007/s12274-022-5318-y
Cite this article:
Xu Y, Yao Y, Deng W, et al. Magnetocontrollable droplet mobility on liquid crystal-infused porous surfaces. Nano Research, 2023, 16(4): 5098-5107. https://doi.org/10.1007/s12274-022-5318-y
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Superhydrophobicity

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Received: 07 September 2022
Revised: 29 October 2022
Accepted: 13 November 2022
Published: 21 December 2022
© Tsinghua University Press 2022
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