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SUMMARY:Two and half liquid crystal motors - Warner\, M (University of Cam
 bridge)
DTSTART:20130430T140000Z
DTEND:20130430T150000Z
UID:TALK45006@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:I describe the theory for two LC-based motors for directly con
 verting light and heat to electrical work. Underpinning these new photo-vo
 ltaic strategies is the reduction in LC order by light via photo-isomerisa
 tion of dye-rods.\n\nThe first motor rests on optically reducing the diele
 ctric susceptibility\, the second on reducing the ferro-electric polarisat
 ion. Non-linear absorption determines the dynamics by bleaching front prop
 agation.\n \nMotor 3 is an optical-to-mechanical converter\, relying on a 
 photo-mechanical force cycle or turbine. It is still work in progress and 
 I only sketch the basic ideas.\n \nIn all cases the fundamental efficiency
  limits (Carnot?) still require evaluation\, but it is possible to calcula
 te the efficiencies of the motors as designed. They depend on material par
 ameters\, once geometry is optimised. In motors 1 and 2\, they could range
  from about 2 - 7% for existing materials.\n\n
LOCATION:Seminar Room 1\, Newton Institute
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