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SUMMARY:MechE Colloquium: Mechanics of wrinkled structures
DTSTART:20200317T121500
DTEND:20200317T131500
DTSTAMP:20260610T235707Z
UID:b3d799ddb49baeb5e1175779ad714188dcd0e7686f31429591a4789f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Andrej Kosmrlj\, Princeton Institute for the Science and
  Technology of Materials\, Princeton University\nAbstract:\nWrinkling inst
 ability of compressed stiff thin films bound to soft substrates has been s
 tudied for many years and the formation and evolution of wrinkles is well 
 understood. Similar wrinkling instabilities also play important role in bi
 ology during the development of organs\, such as brains and guts\, and dur
 ing the formation of bacterial biofilms grown on soft substrates. In recen
 t years\, the wrinkling instability has been exploited to create structure
 s with tunable drag\, wetting\, adhesion\, and to create a template for wi
 re formation. While these studies successfully demonstrated the proofs of 
 concepts\, the quantitative understanding is still lacking\, because very 
 little is known about how wrinkled surfaces deform in response to interact
 ions with environment. To address this issue\, we investigated the linear 
 response of wrinkled structures to external forces. By mapping the problem
  to the Landau theory of phase transitions\, we demonstrated that the line
 ar response to external forces diverges near the onset of wrinkling instab
 ility with the usual mean field exponent found in critical phenomena. Inte
 ractions with environment also dictate the morphology of wrinkled patterns
  in growing biological systems. I will discuss the formation of wrinkling 
 patterns in bacterial biofilms grown on agar substrates\, which usually ha
 ve radial stripe patterns near the outer edge and zigzag herringbone-like 
 patterns in the core. The observed wrinkling patterns result from uneven s
 tress distribution in the biofilm as a consequence from the depletion of s
 lowly diffusing nutrients underneath the biofilm\, which are required for 
 the bacterial growth.\n\nBio:\nFrom 2011 to 2015 I was postdoc with David 
 R. Nelson at Harvard University. In 2011 I received a Ph.D. in Physics at 
 MIT\, where I was co-advised by Arup K. Chakraborty and Mehran Kardar. Bef
 ore coming to MIT I obtained a B. Sc. (2006) in Mathematical Physics from 
 the University of Ljubljana\, Slovenia\, under the supervision of Primož 
 Ziherl.
LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418
STATUS:CANCELLED
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