Article
Chemistry, Physical
Mehran Dadsetan, Ali Naseri, Murray J. Thomson
Summary: Carbon black oxidation is a post-treatment method that controls its properties for different applications. The study investigates the effect of particle size on oxidation pathway and rate by oxidizing three different sizes of carbon blacks. The diffusion-controlled burning model is validated for all samples oxidized at 800 degrees C in the presence of oxygen molecules. Under electron-beam irradiation, larger particles show a reduction in oxidation rate due to the breaking of atomic bonds and transformation to the graphitic structure. However, surface burning remains the dominant mode under electron-beam irradiation.
Article
Nanoscience & Nanotechnology
Lu Zhang, Huanfang Tian, Sining Dong, Dong Yang, Xiaoguang Li, Jun Li, Jianqi Li, Huaixin Yang
Summary: The structural modulations in multiferroic Bi4.2K0.8Fe2O9+delta (BKFO) nanobelts have been uncovered by scanning transmission electron microscopy (STEM). The displacive modulations can be decomposed into a transverse wave and a longitudinal wave, whose amplitudes and phases are layer-dependent. This study may help to understand and optimize the magnetoelectric coupling effect in BKFO.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Kristina Bartha, Josef Strasky, Anna Veverkova, Jozef Vesely, Milos Janecek
Summary: High resolution scanning electron microscopy was used to image the microstructure of Ti15Mo alloy, revealing the presence of omega phase particles and different families of omega phase. Additionally, thin lamellae of alpha phase were observed using transmission electron microscopy.
Article
Chemistry, Physical
Zhongyu Liu, Yingwei Li, Wonyong Shin, Rongchao Jin
Summary: This study compared thin-film and solution-based measurements to reveal the existence of core phonons in Au-25 nanoclusters, as well as the suppression mechanism of staple-shell phonons in the solid state.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Ziqian Wang, Meng Gao, Tonghua Yu, Siyuan Zhou, Mingquan Xu, Motoaki Hirayama, Ryotaro Arita, Yuki Shiomi, Wu Zhou, Naoki Ogawa
Summary: Stacking order plays a significant role in the properties of van der Waals layered magnets, and recent studies suggest possible different stackings in few-layer crystals. This study combines atomic-scale electron microscopy and theoretical calculations to show that while the bulk stacking persists in bilayers of MnPS3, the local rippling effect lifts the monoclinic symmetry of the few layers. This finding reveals the impact of rippling on the microscopic symmetry of two-dimensional materials and suggests the possibility of approaching the two-dimensional Neel antiferromagnetic honeycomb lattice in MnPS3 without reaching monolayer thickness.
Article
Materials Science, Multidisciplinary
Zhuo Chen, Yonghui Zheng, Lukas Loefler, Matthias Bartosik, Huaping Sheng, Christoph Gammer, David Holec, Zaoli Zhang
Summary: In this study, two different twin boundary defect nucleation and coherent twin boundary (CTB) migration modes were observed at different junctions in a binary transition-metal nitrides system. The study also revealed the asynchronous CTB migration mode and its associated atomic-scale dynamic and thermodynamic mechanisms. These findings provide new insights into the atomic-scale deformation mechanism in complex materials.
Article
Nanoscience & Nanotechnology
L. Fu, C. Yang, R. Wei, X. Pei, J. Teng, D. Kong, Y. Lu, Y. Guo, T. Liu, Y. Hu, B. Yin, Z. Zhang, A. Li, L. Wang, X. Han
Summary: This study investigated the atomic-scale deformation process of AuCu nanowires with a size of 16 nm for the first time, revealing superplasticity and high strength at room temperature. The observed superplasticity was found to originate from continuous full dislocation activities and other factors, differing from previous studies on pure metals.
MATERIALS TODAY NANO
(2021)
Article
Materials Science, Multidisciplinary
Akira Hatakeyama, Toshimasa Yoshiie
Summary: The formation of an amorphous gold-silicon alloy by indentation is reported. A polycrystalline gold film on a silicon substrate was indented and resulted in the formation of an amorphous alloy. The effect of the substrate was also investigated using a gold film on a SiO2 substrate, where no amorphization was observed. The amorphization mechanism is discussed based on thermodynamics.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Chemistry, Multidisciplinary
Jiake Wei, Qiuhao Xu, Zhi Xu, Wenlong Wang, Sheng Meng, Xuedong Bai
Summary: Through atomic-scale molecular dynamics simulations and dynamic observations, it is found that Coulomb explosion and field evaporation can modify the structures of few-layer graphene nanoribbons. Coulomb explosion splits the nanoribbons into several sheets, while field evaporation breaks them by emitting carbon ions/segments. The shape of the nanoribbons influences the sequence of splitting and breaking. These findings provide fundamental understanding of Coulomb explosion and field evaporation in graphene nanomaterials and suggest potential engineering methods.
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
Chemistry, Multidisciplinary
Junliang Liu, Yusuke Sato, Viveka K. Kulkarni, Angus I. Sullivan, Wenyu Zhang, Cathleen M. Crudden, Jason E. Hein
Summary: Atomically precise gold nanoclusters (AuNCs) are interesting nanomaterials with potential applications in catalysis, bioimaging, and optoelectronics. However, the synthetic methods for AuNCs lack in situ and real-time reaction monitoring, limiting the understanding of their formation mechanisms and hindering optimization. In this study, the utility of HPLC-MS as a monitoring methodology in the synthesis of two NHC-protected gold nanoclusters was demonstrated, providing new insights into the reaction dynamics and rapid optimization.
Article
Materials Science, Multidisciplinary
Mengmeng Zhang, Jianke Qiu, Chao Fang, Mingjie Zhang, Yingjie Ma, Zhiqing Yang, Jiafeng Lei, Rui Yang
Summary: This article investigates the variation of dislocation structures in Ti-6Al-4V ELI alloy subjected to different stress levels. The results show that stress influences the density of dislocations and the activation of slip systems, which in turn contribute to creep and the formation of low angle grain boundaries.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Anatomy & Morphology
Yu-Jing Zhang, Dong-Yu Chen, Xue-Ting Chao, Zi-Shu Dong, Zong-You Huang, Xia-Lin Zheng, Wen Lu
Summary: This study investigated the antennal sensilla of Copidosomopsis nacoleiae through scanning and transmission electron microscopy. Six types of sensilla were identified on the antennae, with different distribution patterns and potential functions discussed. Future research on host location mechanisms will build upon these observations.
MICROSCOPY RESEARCH AND TECHNIQUE
(2021)
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
Chemistry, Multidisciplinary
Ondrej Dyck, Andrew R. Lupini, Stephen Jesse
Summary: In this study, we demonstrate an electron beam direct-write process in an aberration-corrected scanning transmission electron microscope. This process differs from conventional electron-beam-induced deposition techniques as it uses a different mechanism and elemental tin (Sn) as a precursor to enable atom-by-atom direct writing. The atomic-sized electron beam is used to generate chemically reactive point defects in a graphene substrate, allowing the precursor atoms to migrate and bond to the defect sites for deposition.
Article
Instruments & Instrumentation
Tern Okitsu, Eric Leblanc, Dominique Collard, Hiroyuki Fujita
SENSORS AND MATERIALS
(2019)
Article
Chemistry, Analytical
Satoru Kuriu, Tetsuya Kadonosono, Shinae Kizaka-Kondoh, Tadashi Ishida
Article
Health Care Sciences & Services
Karim Hammoudi, Halim Benhabiles, Mahmoud Melkemi, Fadi Dornaika, Ignacio Arganda-Carreras, Dominique Collard, Arnaud Scherpereel
Summary: COVID-19, initially presenting flu-like symptoms and causing pneumonia, has led to a global pandemic. This study explores the use of deep learning to automatically analyze chest X-ray images for screening and diagnosing COVID-19 patients.
JOURNAL OF MEDICAL SYSTEMS
(2021)
Article
Chemistry, Analytical
Satoru Kuriu, Naoyuki Yamamoto, Tadashi Ishida
Summary: The small intestine is the main site for host immune cells and immune responses are induced through a gut bacteria sampling process. A new microfluidic device was proposed in this study to observe the fluid flow field supporting microparticle settlement on villi in the small intestine.
Article
Computer Science, Artificial Intelligence
Ruiwen He, Halim Benhabiles, Feryal Windal, Gael Even, Christophe Audebert, Agathe Decherf, Dominique Collard, Abdelmalik Taleb-Ahmed
Summary: This paper presents a new vision system for cow heat detection based on the analysis of the cow's genital tract using a CNN model. Experimental results show that our CNN model achieves high accuracy, outperforming 19 methods in the state of the art. Furthermore, an optimized version of the model for Android deployment has been proposed, with a response time of a few seconds on a smart-phone.
APPLIED INTELLIGENCE
(2022)
Article
Chemistry, Medicinal
Tarek Maylaa, Feryal Windal, Halim Benhabiles, Gregory Maubon, Nathalie Maubon, Elodie Vandenhaute, Dominique Collard
Summary: This study compares the performance of three different machine learning architectures for auto-segmentation of cervical cancer cell nuclei and evaluates the impact of using post-processing techniques. The results show that all algorithms achieve good pixel classifications but have limitations in overlapping nuclei regions.
CURRENT COMPUTER-AIDED DRUG DESIGN
(2022)
Article
Biochemical Research Methods
Faruk Azam Shaik, Clara Lewuillon, Aurelie Guillemette, Bahram Ahmadian, Carine Brinster, Bruno Quesnel, Dominique Collard, Yasmine Touil, Loic Lemonnier, Mehmet Cagatay Tarhan
Summary: Analyzing cell-cell interaction is crucial for understanding immune cell functions. This study introduces a method that uses hydrodynamic flow focusing to capture cells of different sizes and analyze their activities through calcium imaging.
Article
Computer Science, Artificial Intelligence
Ziheng Yang, Halim Benhabiles, Karim Hammoudi, Feryal Windal, Ruiwen He, Dominique Collard
Summary: Malaria, caused by Plasmodium parasites, is a life-threatening infectious disease. Children under 5 years old are the most vulnerable group. The World Health Organization encourages research on appropriate methods for malaria treatment. This paper presents a deep learning-based framework for diagnosing human malaria infection from thin blood smear images, showing good generalization potential.
NEURAL COMPUTING & APPLICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Gai Yamauchi, Tadashi Ishida
Summary: A hydraulic microactuator with a coarse/fine drive-switching mechanism was developed to transport cells precisely near sensors in microfluidic devices. The microactuator achieved both coarse approach and fine adjustment of cell position on a thin film toward the microchannel wall by switching drive modes. The displacement ratio achieved using the microactuator was 13.9, with the ability to transport cyanobacteria and adjust their position near the microchannel wall with precision.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Analytical
Momoko Kumemura, Deniz Pekin, Vivek Anand Menon, Isabelle Van Seuningen, Dominique Collard, Mehmet Cagatay Tarhan
Summary: This paper explores the use of microtechnologies in the fields of biology and medicine, highlighting the untapped potential of silicon-based microelectromechanical systems. Innovative fabrication processes and experimental approaches have addressed performance issues of silicon-based microelectromechanical resonators and actuators in liquid environments.
Article
Chemistry, Analytical
Yasunori Tokuoka, Keiichi Kondo, Noboru Nakaigawa, Tadashi Ishida
Summary: Tissue assays have improved our understanding of cancers by examining the three-dimensional structures and cellular diversity, although certain challenges exist. Microfluidic technology has enabled the development of a device capable of forming concentration gradients in tissues for analysis, demonstrating comparability between appearance-based and content-based measurements.
Article
Chemistry, Analytical
Maho Kaminaga, Tadashi Ishida, Toru Omata
Summary: A trapezoid-shaped microvalve was proposed in this study to effectively close deep microchannels for handling large particles. The valve was fabricated using a double-inclined lithography process, and operated by the expansion of a pneumatic balloon.
Article
Chemistry, Analytical
Akihiko Sugihara, Tadashi Ishida
Summary: This study developed a microfluidic liquid cell with a super-thin electron-transparent membrane (ETM) for high-resolution visualization of nanoscaled biological samples in liquid. The use of this super-thin ETM effectively suppressed electron beam scattering and enabled the observation of sub-microscopic structures.
Article
Biochemical Research Methods
Satoru Kuriu, Naoyuki Yamamoto, Tadashi Ishida
Summary: This study presents a microfluidic device to observe the flow around the villi generated by the dynamic deformation of small intestinal tissue. Using this device, the researchers observed the dynamic flow of the villi and the presence of microbeads adhesion to the villi.
Article
Infectious Diseases
Yannick Tauran, Jose Pedro Ceron-Carrasco, Moez Rhimi, Florent Perret, Beomjoon Kim, Dominique Collard, Anthony W. Coleman, Horacio Perez-Sanchez
