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SUMMARY:Elasto-capillary windlass: from spider webs to synthetic meta-actu
 ators
DTSTART:20150217T111500
DTEND:20150217T130000
DTSTAMP:20260415T204100Z
UID:fcc05fef7a3bedcb591d1aa2474b372aef83d5c53f8c4f5df8910457
CATEGORIES:Conferences - Seminars
DESCRIPTION:Hervé Elettro\nSpiders’ threads display a wide range of mat
 erials properties. The glue-covered araneid capure silk is unique among al
 l silks because it is self tensing and remains taut even if compressed\, a
 llowing both thread and web to be in a constant state of tension. Here we 
 demonstrate how this effect is achieved by unraveling the physics allowing
  the nanolitre glue droplets straddling the silk thread to induce buckling
 \, coiling and spooling of the core filaments. Our model examines this win
 dlass activation as a structural phase transition\, which shows that fibre
  spooling results frmo the interplay between elasticity and capillarity. F
 ibre size is the key as such a capillary windlass requires micrometer-size
 d fibres in order to function. Our synthetic capillary windlasses point to
 wards deign principles for new bioinspired synthetic actuators with mechan
 ical properties never seen before.
LOCATION:Room ME B331  http://plan.epfl.ch/?room=ME%20B3%2031
STATUS:CONFIRMED
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