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SUMMARY:Beyond the Parallel Plate Compliant Capacitor Type of Actuator
DTSTART:20190703T110000
DTEND:20190703T120000
DTSTAMP:20260410T174216Z
UID:54985bbb2aa4bd891dcc4303950d3e34aa8d6672a2936859cbf6356f
CATEGORIES:Conferences - Seminars
DESCRIPTION:Professor David R. Clarke is the inaugural holder of the Exten
 ded Tarr Family Professor of Materials in the Harvard School of Engineerin
 g and Applied Sciences. He holds a PhD in Physics from the University of C
 ambridge\, a B.Sc. in Applied Sciences from Sussex University and was awar
 ded a ScD from the University of Cambridge. A member of the National Acade
 my of Engineering since 1999\, he is also a Fellow of both the American Ph
 ysical Society and the American Ceramic Society\, and received an Alexande
 r von Humboldt Foundation Senior Scientist Award in 1993.  He shared the 
 2008 Japanese NIMS Award for Recent Breakthroughs in Materials Science for
  Energy and Environment\, is a Distinguished Life Member of the American C
 eramic Society and was recently listed as author of one of the 11 best pap
 ers in the 110 years of publications on ceramics and glasses. His long-ter
 m interests in materials range from the fundamentals to the applied\, from
  ceramics to metals to semiconductors and polymers. He has published over 
 450 papers in areas of materials ranging from thermal barrier coatings\, t
 o dielectric elastomers to fundamentals of oxidation to microelectronics r
 eliability and the electrical and optical properties of ZnO and GaN. \nAl
 l dielectric actuators and sensors are essentially compliant capacitors\; 
 an applied voltage is converted into a mechanical strain (or\, inversely a
  strain is converted into a voltage). To date\, the majority of applicatio
 ns have utilized the analogy of the parallel plate capacitor configuration
  in which the dielectric is subjected to a spatially uniform electric fiel
 d through its thickness. Consequently\, the strains produced by an applied
  voltage are uniformly biaxial and perpendicular to the applied field. Fur
 thermore\, no shape changes are possible. Despite this restriction\, a wid
 e variety of actuator and sensing devices have nevertheless been devised i
 n the last decade as has been demonstrated at the leading centers of diele
 ctric elastomer actuator research\, such as at EPFL. \n \nMore complex c
 ompliant capacitor geometries than the parallel plate capacitor are possib
 le and these lead to a richer variety of possible actuation motions\, incl
 uding reversible and reconfigurable shape changes.  In turn\, new applica
 tions of dielectric elastomer actuators can be devised. In this seminar\, 
 I will describe some of the research activities underway in our group as w
 ell as our approaches to exploring the opportunities for actuator designs 
 exploiting spatial variations in electric field. \n 
LOCATION:CM 1 105 https://plan.epfl.ch/?room==CM%201%20105
STATUS:CONFIRMED
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