Article
Chemistry, Physical
Akihiro Nagoya, Ritsuko Yaokawa, Nobuko Ohba
Summary: In this study, the effect of fluorine diffusion on the phase transformation of silicene in calcium disilicide was investigated. The results showed fluorine aggregation at low concentrations and predicted a transformation from MLSi to BLSi. The observations were confirmed by both experimental and computational analyses, indicating a destabilization of MLSi structure and transformation to BLSi due to the aggregated fluorine atoms.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Jin-Kyung Kim
Summary: Three deformation mechanisms of TWIP steels were observed by in-situ TEM mechanical testing: formation of deformation twins from grain boundaries, interference of growth of deformation twins by stacking faults, and motion of extended dislocations contributing to plasticity.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Biomedical
Xiang-Long Peng, Subin Lee, Jana Wilmers, Sang Ho Oh, Swantje Bargmann
Summary: The mechanical properties and failure behavior of nacre are strongly orientation-dependent due to its brick-and-mortar microstructure. Experimental and simulation studies have shown how nacre's performance varies under different loading conditions, providing valuable insights for designing artificial composites with enhanced properties.
ACTA BIOMATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Hao Yu, Abbas Sabahi Namini, Mohammad Sadegh Shakeri, Seyed Ali Delbari, Quyet Van Le, Joo Hwan Cha, Soo Young Kim, Ho Won Jang, Sea-Hoon Lee, Zaneta Swiatkowska-Warkocka, Mohammadreza Shokouhimehr
Summary: This research investigated the in-situ formation of carbon in the ZrB2-25 vol% SiC composite prepared by the spark plasma sintering process. The sintering behavior, microstructure, and mechanical properties of the composite were evaluated. The results showed excellent sintering behavior and a high relative density. The study confirmed the reaction between SiC and its surface oxide as the source of carbon formation, as well as the role of SiO2 and B2O3 compounds in triggering the liquid phase sintering mechanism. The research provides important experimental data for the preparation of carbon materials.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Yifan Zheng, Zhi Zhang, Weifeng Liu, Yonghui Wu, Xiutao Fu, Luying Li, Jun Su, Yihua Gao
Summary: This study investigates the electrochemical and mechanical performance of Sb2O3 nanobelts in sodium-ion batteries. It reveals the ultrahigh sodiation speed and multiple-step sodiation reaction of Sb2O3 nanobelts. The orientation and composition of the nanobelts also have a significant impact on their expansion ratio. Additionally, the sodiated Sb2O3 nanobelts exhibit improved toughness and flexibility compared to the pristine ones.
Article
Chemistry, Multidisciplinary
Guangming Zhao, Yunduo Yao, Wei Lu, Guanyu Liu, Xuyun Guo, Antonio Tricoli, Ye Zhu
Summary: Direct observation of the oxygen evolution reaction (OER) on Mn2O3 nanocatalyst surface using in situ liquid holder in a transmission electron microscope (TEM) enables real-time visualization of the chemical process, shedding light on the dynamic OER catalysis and demonstrating a powerful strategy combining in situ and ex situ TEM for investigating various chemical reaction mechanisms in liquid.
Article
Chemistry, Multidisciplinary
Jie Zhao, Liang Liang, Shiyi Tang, Guangqi Zhang, Yi Su, Yuxin Zhao, Mengjuan Li, Lina Zhang, Shoushan Fan, Qunqing Li, Yang Wei
Summary: Low-dimensional materials like graphene are revolutionizing in situ TEM characterization. A new graphene microheater chip was developed, which can be heated up quickly with low power consumption and minimal expansion. The chip's potential in resolving thermodynamic processes was demonstrated through TEM observation of the melting process of Sn. This work opens up new possibilities for graphene and in situ characterization techniques.
Article
Materials Science, Multidisciplinary
Uttam Kumar Murmu, Abhishek Ghosh, Asiful H. Seikh, Ibrahim A. Alnaser, Hany S. Abdo, Naif S. Alowaysi, Manojit Ghosh
Summary: This study investigates the fabrication and characterization of Cu-Ti-B alloys through ball milling of Cu, Ti, and B powders, focusing on the in situ formation of TiB2 and its impact on the mechanical properties of the composites. The results indicate that the in situ formation of TiB2 particles plays a crucial role in determining the mechanical properties of the alloys, which improve with increasing Ti and B content.
Review
Materials Science, Multidisciplinary
Keqiang Li, Yeqiang Bu, Hongtao Wang
Summary: In situ transmission electron microscopy (TEM) has become a powerful technique for materials design and characterization, providing valuable insights into deformation and failure mechanisms. This review summarizes recent advances in in situ TEM mechanical characterization techniques, discussing various holders and nanomanipulation techniques. The article also highlights potential opportunities for further studies using in situ TEM, such as nanomanipulation, ultrafast TEM, and data-driven machine learning.
FRONTIERS IN MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Zhilin Liu, Xiaoming Yuan, Shiliang Wang, Sha Liu, Hark Hoe Tan, Chennupati Jagadish
Summary: This study investigates the mechanical properties and fracture mechanisms of GaAs nanowires under tensile stress, revealing that they deform elastically overall until sudden brittle fracture at 3.79% strain. Experimental results show fracture strength and elastic modulus of 4.0 and 109.5 GPa, respectively, which are much smaller than previous compression-based reports.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Benjamin Galy, Michael Musi, Muriel Hantcherli, Guy Molenat, Alain Couret, Petra Spoerk-Erdely, Helmut Clemens, Jean-Philippe Monchoux
Summary: In this study, dislocation velocities in metallic systems were measured at high temperatures, with simultaneous determination of the corresponding mechanism. Coupled experiments of in-situ TEM investigations and stereographic analyses were conducted in an intermetallic alloy, identifying both mixed climb and pure glide mechanisms. The results showed that within a transition temperature domain, mixed climb can reach the velocity of glide, with dislocation velocities in the same order of magnitude (0.5-5 nm/s).
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Analytical
Jiabao Zhang, Xudong Yang, Zhipeng Li, Jixiang Cai, Jianfei Zhang, Xiaodong Han
Summary: This study developed a novel method for image-based quantification of in situ TEM mechanical tests, using a reference beam in the vicinity of the indenter-sample region. This method allows for direct and dynamic acquisition of indentation depth and load, while observing the indentation process at a high magnification, thereby achieving high spatial and temporal resolutions.
Article
Materials Science, Multidisciplinary
Zhe Chen, Chris Torbet, John Allison
Summary: This study introduces an approach for identifying deformation twinning and twin variants from EBSD data collected at multiple load steps during in situ cyclic loading of a Mg-4Al alloy. The method involves spatial transformation, alignment, and comparison of EBSD maps of different load steps to ensure consistent grain definition. It determines the parent orientation at different load steps and identifies twins by comparing the child grain orientation with each possible twin variant orientation of the parent grain. The methodology allows for visualizing the twin evolution history during cyclic loading.
Article
Materials Science, Multidisciplinary
Mingjun Yang, Andrey Orekhov, Zhi-Yi Hu, Man Feng, Shenbao Jin, Gang Sha, Kai Li, Vahid Samaee, Min Song, Yong Du, Gustaaf Van Tendeloo, Dominique Schryvers
Summary: In-situ TEM experiments revealed that coherent beta'' precipitates in Al alloys are sheared into small fragments by dislocations, while semi-coherent beta' precipitates are more difficult to be fragmented and can maintain their shape after tensile deformation.
Article
Chemistry, Multidisciplinary
Rui Serra-Maia, Pawan Kumar, Andrew C. Meng, Alexandre C. Foucher, Yijin Kang, Khim Karki, Deep Jariwala, Eric A. Stach
Summary: Liquid-cell scanning/transmission electron microscopy (S/TEM) has been used to study nanostructure nucleation and growth, electrochemistry, and corrosion. By generating a gas bubble during electrochemical water splitting, the thickness of the liquid can be reduced to allow for atomic-scale analysis. This method enables multi-modal, nanoscale understanding of solid-state samples in liquid media.
Article
Chemistry, Physical
Mariia Pashchenko, Pavel Veverka, Tomas Kmjec, Ondrej Kaman, Lenka Kubickova, Jaroslav Kohout, Mariana Klementova, Olha Kravchuk, Arthur Vakula, Sergey Tarapov, Jiri Hejtmanek, Karel Knizek
Summary: In this study, two different nanocrystalline forms of iron sulphide were prepared via hydrothermal synthesis using different surfactants, and their crystallinity and magnetic properties were characterized. The temperature-dependent data analysis revealed spin reorientation and the absence of Verwey-like transition in the samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Rebecca Pittkowski, Spyridon Divanis, Mariana Klementova, Roman Nebel, Shahin Nikman, Harry Hoster, Sanjeev Mukerjee, Jan Rossmeisl, Petr Krtil
Summary: Rational optimization of OER activity of catalysts based on LaNiO3 oxide is achieved by maximizing the presence of trivalent Ni in the surface structure. Theoretical predictions of high intrinsic OER activity structures related to LaNiO3 catalysts have been confirmed through the preparation of nanocrystalline LaNiO3-related materials. These materials show a dramatic improvement in OER activity and exhibit stable exfoliated surfaces in OER catalysis.
Article
Materials Science, Multidisciplinary
Frantisek Lukac, Monika Vilemova, Mariana Klementova, Peter Minarik, Tomas Chraska
Summary: The study shows that milling in different atmospheres can adjust the phase composition of high entropy alloys, forming a new phase with significant hardening effect, achieving exceptional hardness.
Article
Chemistry, Multidisciplinary
Tao Zhang, Panpan Zhang, Zhongquan Liao, Faxing Wang, Jinhui Wang, Mingchao Wang, Ehrenfried Zschech, Xiaodong Zhuang, Oliver G. Schmidt, Xinliang Feng
Summary: In this study, high-performance flexible micro-supercapacitors (MSCs) based on highly ordered quasi-two-dimensional polyaniline (q2D-PANI) thin film were prepared using surfactant monolayer assisted interfacial synthesis (SMAIS). The q2D-PANI MSCs exhibited high volumetric specific capacitance and energy density due to their high electrical conductivity, rich redox chemistry, and thin-film morphology, surpassing the state-of-the-art PANI thin-film based MSCs and showing great promise for future flexible electronics applications.
CHINESE CHEMICAL LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Snejana Bakardjieva, Jakub Mares, Eva Koci, Jakub Tolasz, Radek Fajgar, Vasyl Ryukhtin, Mariana Klementova, Stefan Michna, Hana Bibova, Randi Holmestad, Rositsa Titorenkova, Maria Caplovicova
Summary: Ag-decorated TiO2 nanostructured materials were synthesized using non-standard cryo-lyophilization and ArF laser ablation methods. The formation of multiply twinned Ag-(0) structures was observed at elevated temperatures. These materials showed promising photocatalytic activity and improved photoelectrochemical water splitting due to the presence of defect-twinned structures formed by Ag-(0) nanoparticles. This work opens up new possibilities for understanding the defects in Ag-TiO2 nanostructured materials and their correlation with photocatalytic activity.
Article
Chemistry, Multidisciplinary
Jakub Plasil, Gwladys Steciuk, Juraj Majzlan, Radek Skoda, Jan Filip, Martin Petr, Jan Kolarik, Mariana Klementova, Oliver Baehre, Gert Kloess, Ladislav Lapcak
Summary: The weathering of ore minerals produces initial products that are often poorly characterized but can significantly affect the fate of metals in the system. In this study, 3D electron diffraction techniques were used to characterize nanocrystalline phases in the weathering of uraninite-sulfide. The study identified previously unknown phases and revealed that the abundance of iron controls the formation of different weathering products.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Physical
Vasily Lavrentiev, Jan Pokorny, Dagmar Chvostova, Mariana Klementova, Inna Lavrentieva, Jiri Vacik, Alexandr Dejneka
Summary: We report the detection of plasmon-enhanced Raman scattering (PERS) in self-assembled AgxC60 nanocomposite films and investigate the evolution of this effect with increasing Ag concentration, x, in the range of 2 < x < 25. The PERS effect is found to be closely related to the dipolar plasmonic mode generated by uniform 3D-ensemble of Ag nanoparticles in the C-60-based matrix. The analysis of absorption spectra reveals strong coupling between the dipolar plasmon mode and the C-60 low-energy exciton, indicating energy exchange between high- and low-energy polaritonic states. The obtained PERS spectra show sensitivity of the C-60 vibrational modes to the plasmonic field strength, which can be tuned by adjusting the Ag concentration.
Article
Microscopy
Ehrenfried Zschech, Emre Topal, Kristina Kutukova, Jurgen Gluch, Markus Loeffler, Stephan Werner, Peter Guttmann, Gerd Schneider, Zhongquan Liao, Janis Timoshenko
Summary: This study utilized multi-scale X-ray computed tomography (XCT) and transmission electron microscopy (TEM) to reveal the 3D morphology and crystalline structure of hierarchically structured electrocatalytic systems, providing important insights for the design of electrocatalysts in the future.
Article
Chemistry, Multidisciplinary
Petr Brazda, Mariana Klementova, Yasar Krysiak, Lukas Palatinus
Summary: The determination of lattice parameters in 3D electron diffraction data is complicated by various distortions, with the optical elements of the microscope being the most significant problem. In addition to the known distortions, such as barrel-pincushion, spiral, and elliptical distortions, a new distortion called parabolic distortion is observed in the data. The distortions, except for the elliptical distortion, can be determined from a single 3D ED data set. The accuracy of lattice parameter ratios is about 0.1%, and the accuracy of angles is better than 0.03 degrees.
Article
Microbiology
Jana Pilatova, Daria Tashyreva, Jiri Tyc, Marie Vancova, Syed Nadeem Hussain Bokhari, Radim Skoupy, Mariana Klementova, Hendrik Kupper, Peter Mojzes, Julius Lukes
Summary: This study reveals that diplonemids, a group of marine planktonic protists, are capable of accumulating large amounts of barite and celestite crystals. These organisms have the potential to impact the cycling of barium and strontium in the ocean and contribute to the formation of sedimentary rocks. These findings provide new insights into the enrichment of barium and strontium proxies used in paleoceanographic reconstructions of global climate.
Article
Chemistry, Multidisciplinary
Qiudi Yue, Gwladys Steciuk, Michal Mazur, Jin Zhang, Oleg Petrov, Mariya Shamzhy, Mingxiu Liu, Lukas Palatinus, Jiri Cejka, Maksym Opanasenko
Summary: Zeolites are important materials for research and industry, but current synthesis methods are limited. Harsh hydrothermal conditions are required for classical procedures, and post-synthesis methods are only suitable for certain parent materials. However, by stopping degradation at intermediate structures, a new highly crystalline zeolite, IPC-20, was obtained from the parent zeolite IWV through seed-assisted crystallization and gentle transformation. This approach can be applied to any labile material with a staged structure.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Paul B. Klar, Yasar Krysiak, Hongyi Xu, Gwladys Steciuk, Jung Cho, Xiaodong Zou, Lukas Palatinus
Summary: Continuous-rotation 3D electron diffraction methods are used for structure analysis of small organic molecular crystals and inorganic materials. A method that considers multiple scattering effects is presented, improving accuracy and reliability of structure models and determining absolute structures.
Article
Chemistry, Physical
Tomas Zikmund, Jiri Bulir, Michal Novotny, Ladislav Fekete, Sergii Chertopalov, Stefan Andrei Irimiciuc, Mariana Klementova, Jarmila Balogova, Jan Lancok
Summary: This study reports on the formation of silver nanoparticles by gas aggregation in a reaction chamber at room temperature. The size distribution of the nanoparticles was analyzed using atomic force microscopy, while their physical shape and optical properties were characterized using scanning and transmission electron microscopy and spectral ellipsometry. The nanoparticles were then incorporated into various materials to study their influence on emission spectra and transmittance at different annealing temperatures.
Article
Chemistry, Multidisciplinary
Malak Khouchen, Paul Benjamin Klar, Hrushikesh Chintakindi, Ashwin Suresh, Lukas Palatinus
Summary: In this study, the estimation of error in merged reflection intensities in electron diffraction data was investigated. Three correction methods were examined and compared, and it was demonstrated that applying a specific model for correction improved the overall structure quality and the final R-all factor of the given data set, enhancing the accuracy of data processing.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2023)