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Aso R, Midoh Y, Tanigaki T, Murakami Y. High-precision charge analysis in a catalytic nanoparticle by electron holography. Microscopy (Oxf) 2024; 73:301-307. [PMID: 38549513 DOI: 10.1093/jmicro/dfae018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 03/07/2024] [Accepted: 03/21/2024] [Indexed: 07/31/2024] Open
Abstract
The charge state of supported metal catalysts is the key to understand the elementary processes involved in catalytic reactions. However, high-precision charge analysis of the metal catalysts at the atomic level is experimentally challenging. To address this critical challenge, high-sensitivity electron holography has recently been successfully applied for precisely measuring the elementary charges on individual platinum nanoparticles supported on a titanium dioxide surface. In this review, we introduce the latest advancements in high-precision charge analysis and discuss the mechanisms of charge transfer at the metal-support interface. The development of charge measurements is entering a new era, and charge analyses under conditions closer to practical working environments, such as real-time, real-space, and reactive gas environments, are expected to be realized in the near future.
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Affiliation(s)
- Ryotaro Aso
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yoshihiro Midoh
- Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Toshiaki Tanigaki
- Research and Development Group, Hitachi, Ltd., Akanuma 2520, Hatoyama, Saitama 350-0395, Japan
| | - Yasukazu Murakami
- Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- The Ultramicroscopy Research Center, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Schreiber M, Cassidy C. Quantification of Gas-Based Charge Compensation by Off-Axis Electron Holography in Open-Cell Environmental TEM. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:1575-1576. [PMID: 37613884 DOI: 10.1093/micmic/ozad067.810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/25/2023]
Affiliation(s)
- Makoto Schreiber
- Department of Physics, University of Alberta, Edmonton, Alberta, Canada
| | - Cathal Cassidy
- Okinawa Institute of Science and Technology Graduate University, Onna-son, Okinawa, Japan
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Kelly DF, DiCecco LA, Jonaid GM, Dearnaley WJ, Spilman MS, Gray JL, Dressel-Dukes MJ. Liquid-EM goes viral - visualizing structure and dynamics. Curr Opin Struct Biol 2022; 75:102426. [PMID: 35868163 DOI: 10.1016/j.sbi.2022.102426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/27/2022] [Accepted: 06/16/2022] [Indexed: 11/27/2022]
Abstract
Liquid-electron microscopy (EM), the room temperature correlate to cryo-EM, is an exciting new technique delivering real-time data of dynamic reactions in solution. Here, we explain how liquid-EM gained popularity in recent years by examining key experiments conducted on viral assemblies and host-pathogen interactions. We describe developing workflows for specimen preparation, data collection, and computing processes that led to the first high-resolution virus structures in a liquid environment. Equally important, we review why liquid-electron tomography may become the next big thing in biomedical research due to its ability to monitor live viruses entering cells within seconds. Taken together, we pose the idea that liquid-EM can serve as a dynamic complement to current cryo-EM methods, inspiring the "real-time revolution" in nanoscale imaging.
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Affiliation(s)
- Deborah F Kelly
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA; Center for Structural Oncology, Pennsylvania State University, University Park, PA 16802, USA; Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA.
| | - Liza-Anastasia DiCecco
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA; Department of Materials Science and Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada. https://twitter.com/LizaDiCecco
| | - G M Jonaid
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA; Center for Structural Oncology, Pennsylvania State University, University Park, PA 16802, USA; Bioinformatics and Genomics Graduate Program, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA 16802, USA
| | - William J Dearnaley
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA; Center for Structural Oncology, Pennsylvania State University, University Park, PA 16802, USA; Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA. https://twitter.com/PennStateMRI
| | - Michael S Spilman
- Direct Electron, LP, San Diego, CA 92128, USA. https://twitter.com/DirectElectron
| | - Jennifer L Gray
- Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA
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