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DTSTART:20200329T030000
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DTSTART:20191027T020000
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DTSTAMP:20260403T220407Z
UID:5da48afcafdb1231342675@ist.ac.at
DTSTART:20191107T153000
DTEND:20191107T170000
DESCRIPTION:Speaker: Qin Xu\nhosted by Scott Waitukaitis\nAbstract: Surface
  stress\, also known as surface tension\, is a fundamental material proper
 ty of any interface. However\, experimental study of solid surface stress 
 in traditional engineering materials\, such as oxides and metals\, have pr
 oven to be extremely challenging. Current understanding of solid capillari
 ty heavily relies on untested theories\, especially regarding strain depen
 dent surface stress and surface relaxation mechanism. Here\, we take the a
 dvantage of high compliance and large deformability of soft polymer gels t
 o study their surface mechanics. We develop advanced optical techniques\, 
 including in-situ confocal microscopy and surface interferometry\, to prec
 isely measure surface deformation and fast relaxation in wetting problems.
  We experimentally measured strain-dependent surface stress for the first 
 time\, and addressed the importance of surface elasticity of soft solids. 
 Further\, we show how bulk porosity couples with elasticity and surface te
 nsion\, and affects surface relaxation. Our results extend current underst
 anding of mechanics of soft interfaces\, and can bring new insight into va
 rious soft membrane systems.
LOCATION:Mondi Seminar Room 2\, Central Building\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Qin Xu: Solid capillarity and surface dynamics at soft interfaces
URL:https://talks-calendar.ista.ac.at/events/2362
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