(*current group members)
Materials Process-Structure-Property Relationship: Functional Porous Metal/Alloy
Prepared by dealloying, the bi-continuous porous metals and alloys exhibit unique morphology, high surface area and attractive physical and chemical properties. We utilize x-ray nano-tomography and other methods to study their process-structure-property relationships. Nano-porous gold and titanium have been investigated, with other systems such as porous stainless steel and porous silicon are under investigation. The aims are to understand the underlying morphological evolution mechanisms and to develop applications based on their unique physical and chemical properties.
Figure – 3D X-ray nano-tomography reconstruction of a porous stainless steel, prepared by metallic melt dealloying.
Collaborators: H. Kato (Tohoku University), F. Chen (Wuhan University of Technology)
Publication:
“3D Morphological and Chemical Evolution of Nanoporous Stainless Steel by Liquid Metal Dealloying”
Chonghang Zhao, Takeshi Wada, Vincent De Andrade, Li Li, Jeff Gelb, Garth Williams, Juergen Thieme, Hidemi Kato, Yu-chen Karen Chen-Wiegart
ACS Applied Materials & Interfaces (2017), DOI: 10.1021/acsami.7b04659
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Support: NSF CAREER Award 2018
Sustainable Energy: Battery Studies with In Operando Multi-modal Synchrotron X-ray Techniques
Cheng-Hung Lin*, Chonghang Zhao*
We utilize synchrotron x-ray methods including x-ray microscopy, tomography/nano-tomography, diffraction and spectroscopy to study the morphological, chemical and structural evolution of energy storage systems under operational conditions. Systems of interest include Li-ion batteries, solid oxide fuel cells and more recently on Li-S batteries. The aim is to better understand the complex, multi-length scale, heterogeneous phenomena in energy storage materials to further the functionalities of these systems.
Figure – Cu x-ray studies during cycling to study the structural, chemical and elemental distribution evolution in CuS-S hybrid Li-S battery electrode
Collaborator: H. Gan (Brookhaven National Laboratory)
Publication:
“Operando Multi-modal Synchrotron Investigation for Structural and Chemical Evolution of Cupric Sulfide (CuS) Additive in Li-S battery”,
Ke Sun, Chonghang Zhao, Cheng-Hung Lin, Eli Stavitski, Garth Williams, Jaiming Bai, Eric Dooryhee, Klaus Attenkofer, Juergen Thieme, Yu-chen Karen Chen-Wiegart, Hong Gan
Scientific Reports (2017), DOI:10.1038/s41598-017-12738-0
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Cultural Heritage: Heterogeneity in Art Works with Synchrotron X-ray Analysis
Working with museum scientists, we use synchrotron x-ray methods to investigate issues in the fields of cultural heritages such as degradation mechanism in oil paintings due to soap formation. The aim is to better understand the phenomena and changes in the complex, heterogeneous materials in hope to better preserve these precise & unique cultural heritages.
Figure – Synchrotron x-ray fluorescence microscopy shows elemental segregation in soap formation of Pb-Sn yellow paint from 15-th century artwork
Collaborator: S Centeno (Metropolitan Museum of Art)
Publication:
“Elemental and Molecular Segregation in Oil Paintings due to Lead Soap Degradation”,
Yu-chen Karen Chen-Wiegart, Jaclyn Catalano, Garth Williams, Anna Murphy, Yao Yao, Nicholas Zumbulyadis, Silvia A. Centeno, Cecil Dybowski, Juergen Thieme,
Scientific Reports, 7:11656 (2017)
PDF Journal
Industrial Processes: In Situ Characterization of Material Evolution in Thin Films and Surface Treatment
Working with industrial collaborators, we investigate the morphological, structural and chemical evolution in functional materials and processes, such as oxide thin films and anti-corrosion surface treatment. The aim is to utilize cutting-edge characterization tools such as in situ x-ray spectroscopy and imaging to help solving practical issues in manufacturing.
Figure – steel sample mounted in a liquid in situ cell to be investigated by in situ x-ray spectroscopic imaging
Collaborator: S. Petrash (Henkel Corp.)
Support: Henkel Corp.
Materials Process-Structure-Property Relationship: In Situ Studies of Additive Manufacturing (3D Printing)
Cheng-Hung Lin*, Kevin Kucharczyk*
Advances in 3D printing have allowed control of macroscopic designs with novel shape and functionalities. Our research goal is to enabling the control of meso-structures in 3D-printed structure, namely internal features on the order of tens to hundreds of nano-meters within the printed material. We study the dynamics of structural formation during the 3D printing and curing processes using in situ synchrotron scattering methods..
Figure – Using in situ synchrotron scattering methods, we study the dynamics of structural formation during the 3D printing and curing processes
Collaborator: L. Wiegart (Brookhaven National Laboratory), H. Gan (Brookhaven National Laboratory), D. Gersappe (Stony Brook U.)
Support: Energy Seed Grant, College of Engineering and Applied Sciences, Stony Brook University