Letter | Published:

Switching stiction and adhesion of a liquid on a solid

Nature volume 534, pages 676679 (30 June 2016) | Download Citation

Abstract

When a gecko moves on a ceiling it makes use of adhesion and stiction. Stiction—static friction—is experienced on microscopic and macroscopic scales and is related to adhesion and sliding friction1. Although important for most locomotive processes, the concepts of adhesion, stiction and sliding friction are often only empirically correlated. A more detailed understanding of these concepts will, for example, help to improve the design of increasingly smaller devices such as micro- and nanoelectromechanical switches2. Here we show how stiction and adhesion are related for a liquid drop on a hexagonal boron nitride monolayer on rhodium3, by measuring dynamic contact angles in two distinct states of the solid–liquid interface: a corrugated state in the absence of hydrogen intercalation and an intercalation-induced flat state. Stiction and adhesion can be reversibly switched by applying different electrochemical potentials to the sample, causing atomic hydrogen to be intercalated or not. We ascribe the change in adhesion to a change in lateral electric field of in-plane two-nanometre dipole rings4, because it cannot be explained by the change in surface roughness known from the Wenzel model5. Although the change in adhesion can be calculated for the system we study6, it is not yet possible to determine the stiction at such a solid–liquid interface using ab initio methods. The inorganic hybrid of hexagonal boron nitride and rhodium is very stable and represents a new class of switchable surfaces with the potential for application in the study of adhesion, friction and lubrication.

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Acknowledgements

We acknowledge financial support by the Swiss National Science Foundation within the funding instrument ‘Sinergia’. S.F.L.M. acknowledges the receipt of an FP7 Marie Curie European reintegration grant, ERC grant OxideSurfaces and, together with S.D.F., support by FWO–Vlaanderen. We thank M. Schmid for help with the depiction of the STM images, G. Schütz for discussions and A. P. Seitsonen for the artwork in Fig. 1g.

Author information

Author notes

    • Stijn F. L. Mertens
    •  & Adrian Hemmi

    These authors contributed equally to this work.

Affiliations

  1. Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium

    • Stijn F. L. Mertens
    •  & Steven De Feyter
  2. Institut für Angewandte Physik, Technische Universität Wien, Wiedner Hauptstrasse 8–10/E134, 1040 Wien, Austria

    • Stijn F. L. Mertens
  3. Physik-Institut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland

    • Adrian Hemmi
    • , Stefan Muff
    • , Jürg Osterwalder
    •  & Thomas Greber
  4. Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland

    • Oliver Gröning

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Contributions

T.G. conceived the project together with S.F.L.M., who designed and performed the electrochemical experiments, in situ STM and in situ contact angle measurements. A.H. prepared the nanomesh samples, analysed contact angle data and performed the TDS measurements. S.M. built the contact angle apparatus. O.G. drew our attention to dynamic contact angle measurements. S.D.F. and J.O. managed the Sinergia project. All authors contributed to discussions. S.F.L.M., A.H. and T.G. prepared the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to Stijn F. L. Mertens or Thomas Greber.

Extended data

Supplementary information

Videos

  1. 1.

    Advancing, followed by receding electrolyte drop on h-BN/Rh(111), at an applied substrate potential E = +0.1 V

    Advancing, followed by receding electrolyte drop on h-BN/Rh(111), at an applied substrate potential E = +0.1 V, where the nanomesh occurs in its normal corrugated state. The video shows all images captured between t = 68 s and t = 80 s in Figure 3a.

  2. 2.

    Advancing, followed by receding electrolyte drop on h-BN/Rh(111), at an applied substrate potential E = –0.35 V

    Advancing, followed by receding electrolyte drop on h-BN/Rh(111), at an applied substrate potential E = –0.35 V, where hydrogen intercalation has caused flattening of the nanomesh. The video shows all images captured between between t = 95 s and t = 115 s in Figure 3b.

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DOI

https://doi.org/10.1038/nature18275

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