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

Wed, 11/11/2015 - 10:30
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.

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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