Article
Chemistry, Physical
Jin-Hu Dou, Maxx Q. Arguilla, Yi Luo, Jian Li, Weizhe Zhang, Lei Sun, Jenna L. Mancuso, Luming Yang, Tianyang Chen, Lucas R. Parent, Grigorii Skorupskii, Nicole J. Libretto, Chenyue Sun, Min Chieh Yang, Phat Vinh Dip, Edward J. Brignole, Jeffrey T. Miller, Jing Kong, Christopher H. Hendon, Junliang Sun, Mircea Dinca
Summary: Researchers have successfully grown single crystals of 2D metal-organic frameworks up to 200 µm in size by balancing in-plane and out-of-plane interactions, revealing anisotropic transport and a clear correlation between conductivity and the nature of the metal cation in the sheets.
Article
Materials Science, Ceramics
Aaron C. Johnston-Peck, Russell A. Maier
Summary: Adlayers on corundum phase aluminum oxide surfaces were synthesized by annealing oxide powder mixtures and characterized using high-angle annular dark field scanning transmission electron microscopy. The adlayers were found to be pseudomorphic, one atomic layer thick, and with a fractional site occupancy. The relaxation of the adlayer atoms and its sensitivity to the ionic radius of the adsorbate were observed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Zonglin Li, Mingxin Xie, Guozheng Nie, Junhui Wang, Lujun Huang
Summary: In this study, we developed an optical biosensor based on an all-dielectric metasurface with broken symmetry. The biosensor exhibited excellent performance, thanks to the high-Q quasi-bound states in the continuum (qBICs) and the efficient field confinement. It has potential applications in extreme biochemical sensing, such as COVID-19 detection at ultralow concentrations.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Ceramics
Nancy Anna A. Anasthasiya, S. Murugesan, E. Prabhu, N. Sivaraman, K. Gnanasekar
Summary: A paramagnetic material AgCoO2 with a p-type rhombohedral structure is stabilized as a pure phase under low oxygen pressure. Analysis reveals that Ag ions are in +1 oxidation state, while Co ions are mostly in +3 oxidation state, and the material undergoes a super-paramagnetic transition at low temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Mengyu Gao, Yoonjae Park, Jianbo Jin, Peng-Cheng Chen, Hannah Devyldere, Yao Yang, Chengyu Song, Zhenni Lin, Qiuchen Zhao, Martin Siron, Mary C. Scott, David T. Limmer, Peidong Yang
Summary: Halide perovskite is a unique dynamical system with complex structural and chemical processes, but its intrinsic instability makes real-time investigation challenging. However, our research reveals that atomically thin carbon materials can stabilize ultrathin halide perovskite nanostructures and enable atomic-level visualization of their movement. Protected by carbon shells, these structures maintain their integrity under high electron dose rate and exhibit unusual dynamical behaviors. Our work provides a new method to protect beam-sensitive materials and study structure dynamics of nanomaterials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Mechanical
Manon Isard, Imene Lahouij, Jean-Michel Lanot, Pierre Montmitonnet
Summary: This study aims to investigate the physical and chemical mechanisms involved in the formation process of a third body in an electrical contact. Through in-depth cross-section analysis, the structural and chemical changes at the interface between NiCr and AgPd surfaces were identified, discussing methods to inhibit the harmful third body formation and its significant improvement on electrical behavior.
Article
Chemistry, Multidisciplinary
Hao-Chin Huang, Kai-Yuan Hsiao, Yu-Han Tseng, Yan-De Chen, Ming-Yen Lu
Summary: In this study, an in situ transmission electron microscopy (TEM) heating system was used to investigate the morphological changes of cubic Ag nanoparticles (NPs) and Ag-based core-shell structures induced by sublimation, as well as the influence of shell coverage on thermal stability. It was found that large Ag NPs (>50 nm) showed a three-stage sublimation-induced morphological change, while small Ag NPs (<30 nm) showed a uniform sublimation. The sublimation process of core-shell NPs started at stage II, and the thermal stability was enhanced by carbon shell passivation.
Article
Chemistry, Physical
Xin Luo, Ruixin Hao, Hao Wang, Wenbo Zhai, Zeyu Wang, Zhijun Ning, Yi Yu
Summary: By utilizing low dose in situ high-resolution transmission electron microscopy imaging, we directly observed the nucleation and growth process of the phase transition from orthorhombic gamma-CsPbBr3 to cubic alpha-CsPbBr3 in nanoplates during heating. The normalization of (PbBr6)(4-) octahedra was observed, and phase transition pathways (edge-to-center growth and island growth) were summarized. Phase fluctuation/recovery occurs during the phase transition process. Additionally, we investigated the thermal degradation caused by high temperature, which was found to occur from the outer edge to the center region. This work provides a microscopic basis for the understanding of phase transition and its application in devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Food Science & Technology
Amal S. Albedwawi, Reem Al Sakkaf, Tareq M. Osaili, Ahmed Yusuf, Amin Olaimat, Shao-Quan Liu, Giovanni Palmisano, Nagendra P. Shah, Mutamed M. Ayyash
Summary: This paper investigated the ability of lactic acid bacteria (LAB) and Bifidobacterium to remove acrylamide (AA) and examined the mechanism(s) of the AA removal using various microscopic techniques. The results showed that Bifidobacterium breve and Lactiplantibacillus plantarum exhibited higher acrylamide reduction rates. The study also found that both strains could tolerate low pH levels and remove acrylamide under in vitro gastrointestinal conditions.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Oana Cojocaru-Miredin, Arun Devaraj
Summary: In the past decade, the applicability of atom probe tomography (APT) has been extended to a wide range of materials including semiconductors and insulators. However, APT can only provide information about composition, making it challenging to analyze the correlation between composition and other material properties. Therefore, researchers worldwide have been combining APT with other microscopy methods to understand the composition-property interrelationships at the same position of the sample. This article provides an overview of these efforts and presents three examples of opportunities in materials science when using correlative microscopy with APT.
Article
Materials Science, Multidisciplinary
Xiaoyu Liu, Tianzhong Yang, Peilin Lang, Yuan Yao, Xi Shen, Richeng Yu
Summary: Epitaxial CrO2 film was successfully grown on sapphire using CVD method. The interfacial structure and chromium valence distribution were characterized, and the presence of a transition layer was observed.
Review
Chemistry, Multidisciplinary
Haofei Zhao, Yuchen Zhu, Huanyu Ye, Yang He, Hao Li, Yifei Sun, Feng Yang, Rongming Wang
Summary: Nanocrystals play a crucial role in material sciences and industry. Designing nanocrystals with desired structures and properties is a major challenge that requires a deep understanding of atomic-scale dynamics. In situ transmission electron microscopy (TEM), especially environmental TEM, has provided valuable insights into nanocrystals. This comprehensive review highlights the progress in the understanding of nanocrystal dynamics, including nucleation and growth, structure evolution, and dynamics in reaction conditions.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Peter Tieu, Xingxu Yan, Mingjie Xu, Phillip Christopher, Xiaoqing Pan
Summary: The development of single atom catalysts (SACs) with carefully controlled properties has been driven by the need for atom efficient catalysts. Advances in transmission electron microscopy (TEM) techniques, including aberration correction, spectroscopy, and in situ/operando observation, have enabled researchers to study SACs at an atomic scale, providing crucial information about their location, characteristics, and stability.
Article
Geochemistry & Geophysics
Shaofan Che, Adrian J. Brearley
Summary: This study examined a forsterite-bearing Type C CAI from Allende CV3 chondrite, which may have originated from a different precursor and showed characteristics of a two-stage fluid alteration process.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
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.