4-D X-Ray Imaging and Modeling of Lattice Dynamics at the Nanoscale

When Nov 02, 2017
from 10:30 AM to 11:30 AM
Where Sackett Hall 200
Contact NameThomas Berfield
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DR. MATHEW CHERUKARA
POSTDOCTORAL RESEARCH ASSOCIATE
ARGONNE NATIONAL LABORATORY

The Department of Mechanical Engineering will be hosting Dr. Mathew Cherukara from Argonne National Lab.  All are welcome to attend his seminar; see below for details.

Observing the dynamic behavior of materials following ultra-fast excitation can reveal insights into the response of materials under non-equilibrium conditions of pressure, temperature and deformation.  Material response under such conditions is challenging to characterize especially at the nano to mesoscopic spatiotemporal scales.  Time-resolved coherent diffraction imaging (CDI) is a unique technique that enables three-dimensional imaging of lattice structure and strain on sub-ns timescales.  In such a 'pump-probe' technique, stroboscopic x-ray 'probes' are used to image the transient response of a sample following its excitation by a laser 'pump'.  Data from these characterization studies also serve as inputs to material models, which are in turn are used to make predictions at spatio-temporal scales inaccessible to the experiment.  In this talk I will present some of our recent work on imaging and modeling of phonon transport and lattice dynamics in nanomaterials.  I will also describe our work in the development of a machine learning framework that enables rapid and accurate development of material models applicable to a wide variety of materials properties including thermal transport.