Tuesday, April 23, 2019, 10:00 am — Bldg. 735, Conference Room A, 1st Floor
Scattering techniques are useful tools to study various fields in materials science. In particular, there are many large facilities providing cutting-edge scattering techniques that have unique capabilities supporting users to solve challenging issues together. In this talk, I will introduce two main techniques I have been working with: 1) synchrotron x-ray imaging techniques to study fluid dynamics and soft matter physics and 2) ultrafast electron diffraction to study solid state physics. In the first part of this talk, I will mainly present a transmission x-ray microscopy (TXM; x-ray nano-imaging technique) employed to understand static and dynamic elasto-capillary wetting (i.e. wetting on soft solids). We could capture the real-time deformation of a three-phase (soft solid-liquid-vapor) interface during wetting and spreading on soft viscoelastic surfaces. In the second part, I will introduce a new technique called ultrafast electron diffraction (UED) applied to study ps-timescale structure dynamics of 2D materials and ferroelectric perovskite induced by THz/optical laser. From the intensity modulation of Bragg peaks, we could demonstrate a shear mode of WTe2 and longitudinal/transverse acoustic phonon modes in BiFeO3.
Hosted by: Kevin Yager
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