Dr. Yijin Liu 教授访问E01小组 Multiple-length-scale X-ray Microscopy and Its Applications

Time : 
Wed, 11/11/2015 - 10:30
Location : 
M 楼253 会议室

 

SLAC National Accelerator Laboratory

Yijin Liu received a PhD degree in Optics from University of Science & Technology of China in 2009. He joined Stanford Synchrotron Radiation Lightsource of the SLAC National Accelerator Laboratory (Menlo Park, CA) as a postdoctoral scholar in the same year and became a staff scientist in 2012. He is currently leading the Transmission X-ray Microscopy program at SSRL. Liu has 10 years of experience in X-ray microscopy at multiple length scales using both synchrotrons and compact laboratory X-ray sources. In addition to his expertise in methodology of X-ray microscopy, his scientific research focuses on the fields of functional material science and geoscience. He has published more than 50 peer-reviewed scientific manuscripts, many in top tier research journals such as Nature Energy, Nature Geoscience, Nature Scientific Reports, Science Advances, Nano Letter, JACS, PNAS, Advanced Energy Materials, Angewandte Chemie.

Abstract:
The studies of complex heterogeneous systems usually require a suite of analytical tools that are capable of providing complementary information about material properties at different length scales. This is because the heterogeneity in a real-world sample usually exists across a wide range of length scales.
X-ray microscopy offers several different imaging modalities, such as full-field X-ray microscopy, scanning X-ray microscopy, and coherent-based X-ray microscopy. These imaging modalities probe structural and chemical information at different scales ranging from macro-, micro-, meso-, to nano- scales, depending on the X-ray optics used and the configuration of the imaging systems. The pros and cons (in resolving power, sensitivity, data acquisition speed, contrast mechanisms, etc.) of each individual X-ray imaging method naturally make the case that correlative imaging is powerful and beneficial for scientific studies.
In this presentation, I will discuss the strength of correlative multiple-length-scale X-ray microscopy by presenting research works (1) on rechargeable Li-ion battery electrodes [1]; (2) on underground formation for CO2 sequestration [2]; and (3) on complex heterogeneous catalysis material for petro-leum refining [3]. These scientific cases serve as good examples to show the link between the mac-roscopic behavior and the microscopic properties of materials at multiple-length-scales.

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