Article
Multidisciplinary Sciences
Nadezda Varkentina, Yves Auad, Steffi Y. Woo, Alberto Zobelli, Laura Bocher, Jean-Denis Blazit, Xiaoyan Li, Marcel Tence, Kenji Watanabe, Takashi Taniguchi, Odile Stephan, Mathieu Kociak, Luiz H. G. Tizei
Summary: Tracking the lifespan of optical excitations is crucial in understanding the photophysics of materials. In this study, electron spectroscopies were used to explore the creation and decay of excitations in two representative optical materials. The developed cathodoluminescence excitation spectroscopy method allows for imaging energy transfer pathways at the nanometer scale.
Article
Multidisciplinary Sciences
Christopher S. Allen, Fouad Ghamouss, Ouassim Boujibar, Peter J. F. Harris
Summary: Non-graphitizing carbons (NGCs) are a class of solid carbons that cannot be converted into graphite even with high-temperature heat treatment. Despite decades of research, there is still no consensus on their atomic structure and resistance to graphitization. In this study, aberration-corrected transmission electron microscopy was used to investigate an activated carbon, revealing the presence of pentagonal and heptagonal carbon rings. These findings support a model of NGC structure composed of curved fragments with non-hexagonal rings dispersed randomly throughout hexagonal networks.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Taeko Matsukata, F. Javier Garcia de Abajo, Takumi Sannomiya
Summary: Research on exciting nanospheres to generate circularly polarized light emission along arbitrary directions further demonstrates the feasibility of using free-electron-induced light emission in applications such as quantum communication and encryption.
Article
Chemistry, Multidisciplinary
Kunyen Liao, Kiyou Shibata, Teruyasu Mizoguchi
Summary: Grain boundaries significantly affect the coefficient of thermal expansion in polycrystals. This study used EELS to directly measure CTE in different types of grain boundaries, revealing variations in thermodynamic properties and demonstrating the potential of EELS for probing local thermal properties at nanometer-scale resolution.
Article
Chemistry, Multidisciplinary
Taeko Matsukata, Shintaro Ogura, Javier Garcia de Abajo, Takumi Sannomiya
Summary: Free-electron-based spectroscopies can reveal nanoscale optical properties of semiconductor materials and nanophotonic devices. A cathodoluminescence method is demonstrated that can access both excitation and emission spaces at the nanoscale, providing valuable information on previously inaccessible nanoscale optical properties.
Review
Materials Science, Multidisciplinary
Knut W. Urban, Juri Barthel, Lothar Houben, Chun-Lin Jia, Lei Jin, Markus Lentzen, Shao-Bo Mi, Andreas Thust, Karsten Tillmann
Summary: Transmission electron microscopy is a crucial tool for studying the structure and properties of materials at atomic resolution. It allows for high spatial resolution and enables the correlation between microstructure and macroscopic properties. With the development of aberration-corrected electron optics, it became possible to perform picometer-scale measurements and chemical analyses. This paper aims to introduce this new type of electron microscopy, discuss its implications, applications, and limitations in materials science, and provide access to relevant literature.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Engineering, Biomedical
Kathryn Grandfield, Dakota Marie Binkley, Birol Ay, Zhen Mei Liu, Xiaoyue Wang, John E. E. Davies
Summary: The success of titanium dental implants relies on osseointegration and the deposition of bony cement line matrix onto the implant surface. This study explored the integration of cement line with titanium dioxide nanotubes (NTs) on different microstructures of titanium implants. Analysis showed that the cement line matrix covered the NTs regardless of the underlying microstructure, suggesting a mechanism of nanoscale anchorage for improved osseointegration.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
(2023)
Article
Chemistry, Multidisciplinary
Garth C. Egan, Edmond Y. Lau, Eric Schwegler
Summary: We directly imaged the laser-induced cavitation of micron and nanoscale bubbles using Movie-Mode Dynamic Transmission Electron Microscopy (MM-DTEM). The collapse of isolated nanobubbles was observed to occur in less than 50 ns, while larger bubbles (approximately 2-3 μm) grew and collapsed in less than 200 ns. Bubbles in close proximity to each other exhibited more complex behavior, with longer lifetimes and a higher likelihood of rebounding after collapse.
Article
Environmental Sciences
Qingwei Lin, Zhiwen Huai, Luqman Riaz, Xue Peng, Shishi Wang, Biyun Liu, Fei Yu, Jianmin Ma
Summary: This study investigated the accumulation potential of aluminum at the subcellular level and its ultrastructural toxicity in submerged plants. The results showed that severe structural and ultrastructural damage occurred when plants were exposed to aluminum concentrations of 0.6 mg/L or higher. At a concentration of 1.5 mg/L, aluminum could be transferred from the roots to other parts of the plant, with the aged leaves being the most receptive tissues.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2023)
Article
Microscopy
Marek Malac, Jesus Alejandro Marin Calzada, Mark Salomons, Darren Homeniuk, Patrick Price, Martin Cloutier, Misa Hayashida, Doug Vick, Sean Chen, Suliat Yakubu, Zhengxu (Darren) Wen, Marcus Leeson, Mohammad Kamal, Jason Pitters, John Kim, Xuanhao Wang, Olivier Adkin-Kaya, Ray Egerton
Summary: NanoMi is an open source electron microscopy platform that offers a modular and flexible design, suitable for various applications such as education and experimental development. It is capable of SEM, TEM, STEM, and ED imaging modes, with an expected resolution of around 10 nanometers.
Article
Construction & Building Technology
Jun'an Lei, Nanxiang Zheng, Xiaobao Chen, Jiefu Bi, Xirong Wu
Summary: The micro-texture of the aggregate plays a crucial role in the anti-skid performance of asphalt pavement. Sandstone exhibits the best anti-skid performance, followed by magmatic rock and limestone.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Physiology
Andrea M. Lopez-Canizales, Aracely Angulo-Molina, Adriana Garibay-Escobar, Erika Silva-Campa, Miguel A. Mendez-Rojas, Karla Santacruz-Gomez, Monica Acosta-Elias, Beatriz Castaneda-Medina, Diego Soto-Puebla, Osiris Alvarez-Bajo, Alexel Burgara-Estrella, Martin Pedroza-Montero
Summary: This article discusses the changes in the membrane of red blood cells caused by storage and irradiation, characterized using various techniques. The experimental results serve as biomarkers of cell aging and storage damage.
FRONTIERS IN PHYSIOLOGY
(2021)
Article
Materials Science, Multidisciplinary
D. Williams, J. M. Smith, K. Daub, M. Topping, F. Long, S. Y. Persaud
Summary: A failure analysis was conducted on an Alloy C-276 pull rod which experienced unexpected brittle, intergranular fracture after exposure to specific aqueous solutions. Advanced electron microscopy methods were used to characterize the component and determine the nanoscale factors contributing to failure. The cracking mode transition and dependence on stress direction, grain boundary orientation, and crystallographic structures were discussed, with comparisons made to proposed SCC mechanisms in similar environments.
Article
Chemistry, Multidisciplinary
Kenan Elibol, Clemens Mangler, David D. O'Regan, Kimmo Mustonen, Dominik Eder, Jannik C. Meyer, Jani Kotakoski, Richard G. Hobbs, Toma Susi, Bernhard C. Bayer
Summary: This research demonstrates the self-assembly of single indium atoms and few-atom indium clusters in suspended monolayer graphene membranes, anchored to substitutional silicon impurity atoms. Scanning transmission electron microscopy (STEM) revealed that the symmetry of the indium structures is dependent on the coordination of the silicon anchors. Furthermore, electron beam irradiation in STEM enables the observation of formation, restructuring, and translation of the silicon-anchored indium structures.
Article
Materials Science, Multidisciplinary
Manisekaran Hemagirri, Sreenivasan Sasidharan
Summary: This study evaluated the antiaging activity of Polyalthia longifolia leaf methanolic extract (PLME) using three microscopic approaches. The results showed that PLME treatment accelerated yeast cell lifespan, delayed the formation of apoptotic-like vacuoles, and improved cellular morphology.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Electrochemistry
Naoto Katada, Tomoyuki Ozaki, Yuuki Amano, Hijiri Oikawa, Yoshinori Arachi, Kazutaka Mitsuishi
Summary: A LiCoO2 phase prepared by liquid-phase sintering on a Li0.29La0.57TiO3 solid electrolyte showed excellent electrochemical activity, with a microscopic texture consisting of a dense layer closely attached to the solid electrolyte and spherical particles. The preferential growth plane of LiCoO2 on Li0.29La0.57TiO3 was analyzed.
Article
Physics, Applied
Masaki Takeguchi, Xiaoguang Li, Kazutaka Mitsuishi
Summary: The dynamics of Pt nanoparticles in water were observed by high-resolution scanning transmission electron microscopy. At low dose rates, Pt nanoparticles with a diameter smaller than 2 nm exhibit slow motion, attachment, and detachment behavior. The increase in dose rate leads to particle aggregation and the formation of chain network structures.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Masataka Imura, Hideki Inaba, Takaaki Mano, Nobuyuki Ishida, Fumihiko Uesugi, Yoko Kuroda, Yoshiko Nakayama, Masaki Takeguchi, Yasuo Koide
Summary: The structural quality of AlN layers grown on a sapphire substrate using metal-organic vapor phase epitaxy (MOVPE) was significantly improved by post-growth annealing, resulting in a smoother surface and better crystal quality. This work has implications for the industrial production of AlxGa1-xN-based ultraviolet light-emitters.
Article
Microscopy
Xiaoguang Li, Kazutaka Mitsuishi, Masaki Takeguchi
Summary: This study investigates the dynamics of platinum nanoparticles in a homemade liquid cell using transmission electron microscopy. It is found that the use of a strong electron beam causes nanoparticle aggregation and hole drilling on the membrane, but coating a suitable thickness of amorphous carbon layer can prevent these issues.
Article
Electrochemistry
Hijiri Oikawa, Yuta Yoshida, Yoshinori Arachi, Kazutaka Mitsuishi
Summary: This paper presents a technique to form an electrochemically active interface between the oxides in an all-solid-state Li secondary battery (ASSB) using liquid sintering. The performance of the ASSB is improved by the porous LLTO supporting Li-ion conduction. The effective formation of electrodes using molten salts facilitates the creation of ASSBs comprising oxides alone.
Article
Nanoscience & Nanotechnology
Miyuki Sakakura, Kazutaka Mitsuishi, Toyoki Okumura, Norikazu Ishigaki, Yasutoshi Iriyama
Summary: Combining Garnet-type LLZ and LISICON-type LGVO as a multilayer solid electrolyte sheet can effectively reduce reactivity issues during the sintering process, improving the performance and cycle life of solid-state batteries.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Aimi A. H. Tajuddin, Mitsuru Wakisaka, Tatsuhiko Ohto, Yue Yu, Haruki Fukushima, Hisanori Tanimoto, Xiaoguang Li, Yoshitatsu Misu, Samuel Jeong, Jun-ichi Fujita, Hirokazu Tada, Takeshi Fujita, Masaki Takeguchi, Kaori Takano, Koji Matsuoka, Yasushi Sato, Yoshikazu Ito
Summary: To achieve a sustainable hydrogen economy, corrosion-resistant non-noble-metal catalysts are necessary. This study investigates the self-selection/reconstruction characteristics of multi-element alloys and their performance in the oxygen evolution reaction, demonstrating high corrosion resistance and catalytic activity.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Kento Ishii, Machiko Ode, Kazutaka Mitsuishi, Shogo Miyoshi, Takahisa Ohno, Kazunori Takada, Tetsuo Uchikoshi
Summary: Adding an appropriate amount of cobalt ions to the electrolyte material can decrease the sintering temperature and increase the conductivity.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Multidisciplinary
Hirotoshi Yamada, Tomoko Ito, Tatsuya Nakamura, Raman Bekarevich, Kazutaka Mitsuishi, Sanoop Palakkathodi Kammampata, Venkataraman Thangadurai
Summary: All-solid-state lithium batteries (ASSLBs) with garnet-type solid electrolytes are prepared using quick liquid phase sintering (Q-LPS) method. Through optimizing materials, processes, and architectures, the battery performance is significantly improved. The initial discharge capacity of the cell with LiCoO2 loading of 8.1 mg reaches 1 mAh cm(-2) and 130 mAh g(-1) at 25 degrees C. The Q-LPS method is suitable for large-scale manufacturing of ASSLBs.
Article
Chemistry, Physical
Fumihiko Ichihara, Kodai Niitsu, Yoshinori Tanaka, Yasuhiro Niwa, Kazutaka Mitsuishi, Shogo Miyoshi, Takahisa Ohno, Takuya Masuda
Summary: The structure of a mixed composite of LiCoPO4 (LCP) and Li1.3Al0.3Ti1.7(PO4)3 (LATP) was analyzed using various techniques. The crystal structure and electronic state of LCP and LATP remained unchanged, but amorphous reaction layers were formed at temperatures above 700°C. The reaction layers consisted of Li, O, P, and Co, with P and Co being richer and poorer than LCP, respectively. Li3PO4 and divalent Co compounds, such as CoO, were identified as the major species in the reaction layers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yoshiyuki Inaguma, Akihisa Aimi, Takahiro Ao, Yosuke Hamasaki, Daisuke Mori, Koichiro Ueda, Minoru Ikeda, Takahisa Ohno, Kazutaka Mitsuishi
Summary: We synthesized polycrystalline perovskite-type Li-ion-conducting oxides and evaluated their crystal structure, microstructure, ionic conductivity, and electrochemical stability. The compound with the composition Sr0.458Li0.384Ti0.3Ta0.7O3 exhibited the highest bulk and total ionic conductivity, which were higher than those of the reference material LLTO. First-principles calculations showed that the distortion of BO6 octahedra and the second-order Jahn-Teller effect facilitated the diffusion of Li ions. A solid-state Li-ion battery using Sr0.458Li0.384Ti0.3Ta0.7O3 as the electrolyte showed promising performance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Masaki Takeguchi, Toshiaki Takei, Kazutaka Mitsuishi
Summary: The structural change in Pt networks composed of multiple chain connections among grains was observed in air at 1 atm using atomic-resolution environmental cell scanning transmission electron microscopy. By increasing the electron beam dose rate, the structural change of the Pt networks became significant, mainly caused by the movement and deformation of unstable grains and grain boundaries. The oxidized surface layers may hinder the surface atomic step motion, mitigating the change in the size of the grains and grain boundaries.
Article
Chemistry, Multidisciplinary
Yuta Saito, Shogo Hatayama, Wen Hsin Chang, Naoya Okada, Toshifumi Irisawa, Fumihiko Uesugi, Masaki Takeguchi, Yuji Sutou, Paul Fons
Summary: This article reports on the growth of thin crystalline films of the metastable phase GeTe2. Direct observation by transmission electron microscopy revealed a Te-Ge-Te stacking with van der Waals gaps. Moreover, electrical and optical measurements demonstrated that the films exhibited semiconducting properties suitable for electronic applications. Feasibility studies involving device structures also highlighted the potential of GeTe2 as an electronic material.
MATERIALS HORIZONS
(2023)
Article
Physics, Multidisciplinary
Katsuaki Nakazawa, Yuhki Tsukada, Shin-ichi Amma, Kazutaka Mitsuishi, Kiyou Shibata, Teruyasu Mizoguchi
Summary: The study observed the phase separation process of amorphous glass in initial and intermediate stages, revealing specific changes in the phase-separated structures. The results indicate that the characteristic changes in phase-separated structures are attributed to the multimetastability of the amorphous phase.
PHYSICAL REVIEW RESEARCH
(2022)
