Volumetric heat capacity enhancement in ultrathin fluorocarbon polymers for capacitive thermal management
Tian, Hongxiang
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https://hdl.handle.net/2142/24118
Description
Title
Volumetric heat capacity enhancement in ultrathin fluorocarbon polymers for capacitive thermal management
Author(s)
Tian, Hongxiang
Issue Date
2011-05-25T15:03:49Z
Director of Research (if dissertation) or Advisor (if thesis)
Sinha, Sanjiv
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
thin film differential scanning calorimetry
heat capacity
fluorocarbon polymer
Abstract
Capacitive thermal management in electronics requires an enhancement in the volumetric storage density of compatible materials to approximately 1 GJ/m3. We investigate potential enhancement in sensible storage density arising from size e ects in thin polymer lms. We design and fabricate a micro-calorimeter to measure the volumetric heat capacity of nanometer
scale thin uorocarbon polymer lms. The storage density increases approximately three times as the lm thickness decreases from 27 nm to 12
nm. Using the Debye theory of phonons, we relate this behavior to an increase in the Gr uneisen parameter with decreasing lm thickness. This work advances the understanding of size dependence in the heat capacity of amorphous
polymers as well as highlights their potential for capacitive thermal
management.
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