Static Friction of Liquid Marbles.

Authors

Yui Takai, Kei Mukoyama, Pritam Kumar Roy, Guillaume Lagubeau, David Quéré, Samuel Poincloux, Timothée Mouterde

Published in

Physical review letters. Volume 137. Issue 5. Pages 054001. Jul 31, 2026.

Abstract

Liquid marbles, droplets coated with a granular layer, are highly mobile as particles prevent capillary adhesion to the substrate. Yet their coating creates a static rolling friction, which we measure and model. Motion requires shear within the shell so that it is governed mainly by the grain density. This density controls yielding via a logistic function emerging as the particle network approaches percolation and increasing rapidly at close packing. More broadly, our system offers a simple platform for probing granular raft mechanics and measuring their effective surface tension.

PMID:
42606477
Bibliographic data and abstract were imported from PubMed on 17 Aug 2026.

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