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SUMMARY:Active Solids - Jack Binysh\, University of Bath
DTSTART:20230629T120000Z
DTEND:20230629T130000Z
UID:TALK202522@talks.cam.ac.uk
CONTACT:Marco Vona
DESCRIPTION:Active solids consume energy to allow for actuation and shape 
 change not possible in equilibrium. In this talk\, I will focus on the ela
 sticity of systems as wide-ranging as far-from-equilibrium hydrogels\, nan
 oparticles\, and mechanical structures composed of active robotic componen
 ts. First\, I will introduce our recent work on hydrogel spheres being low
 ered onto a hot plate [1]. As the bottom vaporises\, the resulting flow co
 uples tightly to elastic deformations within the sphere\, giving either sp
 ontaneous bouncing or steady-state floating as manifestations of the so-ca
 lled elastic Leidenfrost effect. I will present theory and simulations of 
 the floating case\, which demonstrate a remarkable phenomenon: the heavier
  the solid\, the higher it floats. I will then discuss the general competi
 tion between active boundary stresses and an elastic bulk\, giving rise to
  so-called active elastocapillarity [2]. Finally\, I will discuss our curr
 ent work on using non-reciprocal interactions in active elastic media to p
 rogram robust mechanical actuation and locomotion. In each case\, our resu
 lts provide theoretical underpinning for recent experimental advances\, an
 d point to the design of novel soft machines.\n\n[1] Binysh et al. Thermod
 ynamic lubrication in the elastic Leidenfrost effect. arXiv:2207.02769\n\n
 [2] Binysh\, Wilks\, Souslov. Active elastocapillarity in soft solids with
  negative surface tension. Science Advances\, abk3079 (2022)
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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