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
Add event to calendarvCal


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.