Coupling the Leidenfrost effect and elastic deformations to power sustained bouncing

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Abstract

The Leidenfrost effect occurs when an object near a hot surface vaporizes rapidly enough to lift itself up and hover1,2. Although well understood for liquids1,2,3,4,5,6,7,8,9,10,11,12,13,14 and stiff sublimable solids15,16,17,18, nothing is known about the effect with materials whose stiffness lies between these extremes. Here we introduce a new phenomenon that occurs with vaporizable soft solids—the elastic Leidenfrost effect. By dropping hydrogel spheres onto hot surfaces we find that, rather than hovering, they energetically bounce several times their diameter for minutes at a time. With high-speed video during a single impact, we uncover high-frequency microscopic gap dynamics at the sphere/substrate interface. We show how these otherwise-hidden agitations constitute work cycles that harvest mechanical energy from the vapour and sustain the bouncing. Our findings suggest a new strategy for injecting mechanical energy into a widely used class of soft materials, with potential relevance to fields such as active matter, soft robotics and microfluidics.

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Figure 1: Sustained bouncing of hydrogel spheres on a hot surface.
Figure 2: Energy injection and mass loss.
Figure 3: High-frequency, microscopic gap oscillations at the interface.
Figure 4: Coupling the Leidenfrost effect to elastic deformations.

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Acknowledgements

We thank I. Panchenko for producing the video that inspired this project. We acknowledge K. Harth for a critical reading of the manuscript. We thank E. Clement, J. Dijksman, D. Durian, H. Jaeger, D. Lohse, L. Lubbers and R. Sijbesma for productive conversations. M. van Deen, D. Ursem, R. Struik and J. Mesman provided critical technical support. A.S. acknowledges funding from the Delta Institute for Theoretical Physics and the hospitality of the IBS Center for Theoretical Physics of Complex Systems, Daejeon, South Korea. We acknowledge funding from the Netherlands Organisation for Scientific Research through grants VICI No. NWO-680-47-609 (M.v.H. and S.R.W.), VENI No. NWO-680-47-445 (C.C.) and VENI No. NWO-680-47-453 (S.R.W.).

Author information

S.R.W. conceived of the project. S.R.W. and A.Z. performed the experiments. S.R.W., M.v.H., C.C. and A.S. developed the model and S.R.W. implemented it numerically. All authors contributed to the writing of the manuscript.

Correspondence to Scott R. Waitukaitis.

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The authors declare no competing financial interests.

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Waitukaitis, S., Zuiderwijk, A., Souslov, A. et al. Coupling the Leidenfrost effect and elastic deformations to power sustained bouncing. Nature Phys 13, 1095–1099 (2017) doi:10.1038/nphys4194

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