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SUMMARY:Frequency matters: Understanding and measuring heat transfer in mi
 cro- and nanoscale applications
DTSTART:20160525T141500
DTEND:20160525T151500
DTSTAMP:20260408T121019Z
UID:9de0b047af03398e0b719af302ed25fbbd85affa3113d7cb6dd08dd7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Christian Monachon\, Mechanical Engineering Department\, U
 niversity of California\, Berkeley\nHeat transfer at the micro- and nano-s
 cale is critically important in current technologies. Direct applications 
 include microprocessors\, high performance heat sink technologies and ther
 mal barrier coatings as they all exhibit size effects. Among these effects
  I will put a special emphasis on the presence of an ever-growing density 
 of heterogeneous interfaces in these devices\, which limits their efficien
 cy by hampering waste heat extraction from them.\n \nConcomitantly\, in t
 he past 20 years a class of techniques\, using electrothermal and laser-ba
 sed modulated heating\, has been developed. They can access nanoscale prop
 erties through careful control of thermal penetration depth through modula
 tion frequency adjustments. I will introduce these techniques and their ca
 pabilities\, with a special focus on Time Domain Thermoreflectance (TDTR)\
 , which is a fs laser pump-probe thermoreflectance technique\, and is capa
 ble of thermally probing properties of materials with dimensions down to a
  few nm or single interfaces.\n \nI will then show how I used TDTR to mea
 sure thermal boundary conductance (TBC) of solid/solid interfaces. In part
 icular\, I will show that a comprehensive understanding of interfaces in t
 erms of chemistry and interfacial work of adhesion is instrumental to obta
 in high TBCs\, with up to 25-fold increases obtained in some cases. I will
  also present a new way of quantitatively estimating the TBC of strong int
 erfaces at high temperatures\, which makes it useful for engineering purpo
 ses. I will conclude by suggesting how insights into modulated heating can
  be applied in novel manufacturing techniques.\nBio: Christian Monachon ea
 rned his B. Sc. and M. Sc. Materials Science and Engineering in 2008 at th
 e École Polytechnique Fédérale de Lausanne (EPFL)\, along with a minor 
 in energy technologies and a Master thesis in mechanical metallurgy at Nor
 thwestern University in Chicago\, USA. After earning his PhD in mechanical
  metallurgy from EPFL in 2013\, he moved to work as a postdoctoral fellow 
 at the Mechanical Engineering department at the University of California i
 n Berkeley. His current interests are in understanding and measuring therm
 al transport at micro- and nanometer scale\, with applications in thermal 
 management\, energy conversion and manufacturing.
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STATUS:CONFIRMED
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