SEMINAR - Engineering Nanoscale Transport of Energy and Momentum, by Dr. M. Zubaer Hossain, Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA

Education - Colloquium - WPI Only

Monday, February 4, 2013
11:00 AM-12:00 PM

Higgins Laboratories

From a fundamental viewpoint, transport of energy or momentum involves two basic steps: (a) energy exchange
between source (e.g. Sun) and target (e.g. solar cell) and (b) energy transport within the target. Atoms,
electrons and phonons  which are the fundamental carriers of energy or momentum  govern both the exchange
and transport processes in an intricate manner. Likewise, nanoscale deformation arising from material
heterogeneity, interfacial interactions, structural instability, or applied fields is inevitable at the
nano-level length scales and femto-level time scales. Thus, the research constituting this talk explores
the connection between nanoscale deformation and transport, in order to (a) obtain a better understanding
of the fundamental nanomechanical processes affecting macroscale properties, (b) attain an ability of
engineering energy transport by mediating its carriers, (c) improve the controllability of energetic
processes affecting energy conversion or material degradation, and (d) assess the deleterious effects
originating from deformation in emerging nanomaterials with applications in energy, nanotechnology, and

The talk will exemplify a multidisciplinary perspective in understanding the influence of nanoscale
deformation and disorder on a range of fundamental mechanisms in Si1-xGex (quantum dots, alloys), carbon
allotropes (graphene, carbon nanotube), and tungsten. Particular emphasis will be given to discuss two
multiscale efforts: one in the space domain that combines first-principles, k.p and finite element
calculations to examine nanoscale disorder effects on energy absorption in alloy quantum dots; and the
other in the time domain that couples femtosecond energy deposition (and associated nanoscale deformation)
with momentum transport to explain the origin of hour-scale experimental observation of ripple formation
in ion bombarded solids.

Suggested Audiences: College

Phone: 508-831-5236

Last Modified: January 31, 2013 at 8:36 AM

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