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McMaster University

Departmental Colloquium

SPEAKER Dr. James Harden University of Ottawa
TOPIC XPCS studies of collective dynamics and mechanical evolution in soft nanostructured materials 

This talk will introduce x-ray photon correlation spectroscopy (XPCS) as a method for studying dynamical and mechanical behavior in soft nanostructured materials. In XPCS, the characteristic “speckle” patterns resulting from the scattering of coherent x-rays are auto-correlated to uncover collective dynamics in a sample. XPCS can currently be used to study the dynamical behavior of non-ergodic materials on the nanoscale over a wide range of time scales (from 10-3-103s). Moreover, since x-rays are less strongly scattered by typical soft materials than by visible light, XPCS is able to probe dynamics of turbid samples that are inaccessible to optical methods such as dynamic light scattering and particle tracking. This capability has led to successful XPCS studies of slow dynamics in numerous soft glassy systems, several of which will be discussed in this talk. I will also discuss the recently developed rheo-XPCS technique for in situ studies of dynamics in response to applied deformation, and highlight mechanical rejuvenation and over-aging phenomena observed in soft glassy systems subjected to deformation histories.
DATE Wednesday, March 08, 2017
TIME 3:30 pm
  Coffee will be served at 3:10 pm (ABB 273 lounge)
HOST Kari Dalnoki-Veress  [, Phone: (905)525-9140 ext 22658 ]

For more information phone 905-529-7070 X24559 or Email the Department of Physics and Astronomy

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