Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y54: Active Mechanics of Networks and Gels II
11:15 AM–2:15 PM,
Friday, March 9, 2018
LACC Room: 514
Sponsoring Units: GSOFT DBIO
Chair: Itamar Kolvin, Hebrew Univ of Jerusalem
Abstract: Y54.00015 : Why won't these balls stop squeeking and jumping!? (i.e. the transition from elastic to equilibrium Leidenfrost with hydrogel spheres)*
2:03 PM–2:15 PM
(University of Twente)
Martin Van Hecke
(Univ of Leiden)
When hydrogel spheres are dropped onto hot surfaces, they harvest mechanical energy and squeek and bounce for several minutes. This commotion is related to the Leidenfrost effect, whereby a liquid drop above a hot surface floats on a cushion of vapor. Why can't hydrogels also do this "normal" floating Leidenfrost? In this talk, I will show that they can and explain how. Aside from shushing these squeeky hot bouncers, creating hovering hydrogels opens up the possibility to direct their dynamics by molding them into smart shapes.
*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.) and VENI No. NWO-680-47-453 (S.R.W.).
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