Article
Materials Science, Multidisciplinary
Xianzheng Lu, Chiping Lai, Luenchow Chan
Summary: This study employed high-resolution micro-focus X-ray Computed Tomography (CT) system and loading-unloading tensile test to quantify the 3D interactions of micro-voids evolution in biocompatible alloy stainless steel 316L (SS316L). The dynamic evolution mechanism of ductile damage involving the nucleation, growth, and coalescence of micro-voids was revealed, and an improved micromechanics-based damage model considering large deformation condition was implemented for damage prediction.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Ceramics
Altair T. Contreras Jaimes, Araceli de Pablos-Martin, Katrin Hurle, Juliana Martins de Souza e Silva, Lutz Berthold, Thomas Kittel, Aldo R. Boccaccini, Delia S. Brauer
Summary: The crystallization process of Bioglass 45S5 in tissue engineering still remains not fully understood, but advanced imaging techniques such as transmission electron microscopy and X-ray nano-computed tomography have enabled researchers to visualize the microstructural changes from near nucleation to almost full crystallization.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Tiancong Zhao, Runfeng Lin, Borui Xu, Minchao Liu, Liang Chen, Fan Zhang, Yongfeng Mei, Xiaomin Li, Dongyuan Zhao
Summary: While previous studies on the interaction between nanoparticles and biological barriers mainly focus on the static state, this research investigates the fluid dynamics of nanoparticles and their impact on encountering biological hosts. The researchers successfully synthesized badminton-like Fe3O4&mPDA Janus nanoparticles and studied their stable fluid posture and motion characteristics. The results show that these nanoparticles have reduced blood vessel wall encountering frequency and longer blood half-life compared to conventional spherical nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Tiancong Zhao, Runfeng Lin, Borui Xu, Minchao Liu, Liang Chen, Fan Zhang, Yongfeng Mei, Xiaomin Li, Dongyuan Zhao
Summary: This study investigates the fluid dynamics effects of nanoparticles' interaction with biological barriers. Janus nanoparticles with a badminton-like structure were successfully synthesized, and they showed more stable movement in fluid and reduced organ uptakes compared to conventional spherical nanoparticles.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Netrapal Singh, Hafsa Siddiqui, Manoj Goswami, Satendra Kumar, Mohammad Ashiq, Natarajan Sathish, Mysore Sridhar Santosh, Surender Kumar
Summary: Nanoscale-thick silver thin films (Ag-NTF) are fabricated on indium tin oxide-coated glasses through an electrochemical 3D printing process. The Ag-NTF electrode exhibits uniform and nanometer-thick film structure, with a mean crystallite size of 17 nm. The electrode shows excellent electrochemical activity, with a sensitivity of 25 +/- 1 mu A mM-1 cm-2 and a lower detection limit of 1.0 mu M for hydrogen peroxide sensing. The electrode also demonstrated good selectivity towards H2O2 and applicability in real-life samples.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Hongbo Zhou, Dongxu Zhang, Weixuan Dong, Chunxing Zhou, Tianyao Jiang, Yashu Liu, Chungui Tian, Yanhong Liu, Yu Liu, Baodong Mao
Summary: The construction of interjaculated CoSe/Ni3Se4 heterostructures on stainless steel meshes using a two-step hydrothermal method demonstrates outstanding electrocatalytic performances for overall water splitting. The composite achieves low over-potentials of 97 mV for hydrogen evolution and 230 mV for oxygen evolution to reach a current density of 10 mA cm-2. This work provides a new perspective for the preparation of high-performance and cheap electrocatalysts that are easy to be integrated with industrial applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Tianshu Li, Gerald S. Frankel
Summary: The repassivation temperature (Trp) of one-dimensional artificial pits made from 316L stainless steel in 3.5 wt.% NaCl was investigated using downward temperature scanning. The study found that for a given pit depth, Trp exhibited an unexpected S dependence on applied potential. Further analysis revealed that this relationship is derived from repassivation occurring underneath the salt film, rather than from repassivation when the concentration of metal cations at the pit surface decreases below a critical value. It suggests a reversal in the effect of the salt film on pit growth stability, depending on temperature, applied potential, and pit depth.
Article
Chemistry, Inorganic & Nuclear
Hui Liu, Yuanke Wu, Pan Liu, Han Wang, Maowen Xu, Shu-juan Bao
Summary: A novel material with a nano-Co-armed carbon nanotube functional layer was proposed to enhance the stability of room temperature Na-S batteries by improving the adsorption and conversion efficiency of NaPSs, achieving high electronic conductivity and low decay rate. This unique structure delivered improved stable electrochemical performance with high coulombic efficiency and excellent capacity rate.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
Cheng-Yao Huang, Hung-Wei Yen
Summary: This study investigated nano precipitates in stainless maraging steel (Custom 475) using high-resolution transmission electron microscopy. The aging process in this steel results in the formation of NiAl-B2 phase, R phase, and austenite, with different hardening effects depending on the aging temperature. Efficient hardening was achieved by aging at 520 degrees C for 4 hours, leading to the formation of both B2 and R nano precipitates and achieving maximum hardness of 601 HV.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Rene Laquai, Thomas Schaupp, Axel Griesche, Bernd R. Mueller, Andreas Kupsch, Andreas Hannemann, Thomas Kannengiesser, Giovanni Bruno
Summary: This study presents a method to quantify hydrogen-assisted damage in lean duplex steel using synchrotron X-ray refraction computed tomography (SXRCT). The results show that SXRCT outperforms synchrotron X-ray absorption computed tomography in characterizing the damage. It is also found that cracks in the specimen are caused by the rolling process rather than hydrogen-assisted, and significant crack propagation can only be observed shortly before rupture.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jun Jie Cao, Yu Jiang, Hang Zhan, Yu Zhang, Jian Nong Wang
Summary: In this study, high-density and well-aligned CNT arrays were successfully synthesized by in situ formation of Fe-based catalysts on a stainless steel mesh, accompanied by the supply of CO2. The height of the CNT arrays was boosted from 15 μm to 80.0 μm, providing an efficient strategy for VACNT growth on conductive substrates.
Article
Materials Science, Multidisciplinary
Tayebeh Sharifi, Yousef Ghayeb, Tecush Mohammadi, Mohamad Mohsen Momeni, Robabeh Bagheri, Zhenlun Song
Summary: Chromium-doped TiO2 nanotubes (CT) film was prepared on titanium substrates by an in-situ electrochemical anodizing method, followed by photodeposition of NiO to optimize the NiO-chromium-doped TiO2 nanotubes (NCT) fabrication. Characterization techniques confirmed the anatase form of TiO2 and the presence of NiO. UV-Vis spectra showed enhanced visible light absorption with NiO deposition on CT.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Daisuke Muramatsu, Keisuke Masunaga, Aoi Magori, Satoru Tsukada, Katsuyoshi Hoshino
Summary: In this study, a three-dimensional porous current collector comprising stainless-steel fibers is fabricated to improve the performance of electric double-layer capacitors (EDLCs). The unique current collector shows better charge-discharge properties and capacity at higher electrolyte concentrations, as well as minimal capacity degradation and good rate performance. The capacitance values of the EDLC using the stainless-steel fiber sheet current collector are roughly twice that of an EDLC using a flat stainless-steel plate current collector, without any performance degradation even at a higher loading of electrode active materials. These improvements are attributed to the reduction in several resistances, leading to enhanced performance of the EDLC.
Article
Materials Science, Multidisciplinary
Li Ma, Benjamin Lynch, Frederic Wiame, Vincent Maurice, Philippe Marcus
Summary: Scanning tunneling microscopy was used to investigate the topographical and structural changes of a model 304 austenitic stainless steel surface resulting from ultra-low exposures to gaseous oxygen at room temperature. The study observed 2D nucleation and growth mechanisms until surface saturation by a nanogranular Cr(III)-enriched oxide film, providing a nanoscale understanding for improving the local stability of passivity in the Crenriched oxide film.
Article
Chemistry, Multidisciplinary
Chengcheng Wang, Jingjing Zhu, Shasha Wang, Lingzhou Zhao, Peng Wei, Tao Yi
Summary: A novel nano-sized iodinated contrast agent was developed in this study, utilizing an aggregation-induced emission luminogen (AIEgen) for excellent tumor targeting and aggregation. This improved the retention efficiency and imaging quality of the contrast agent in tumor regions.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Zhonglei Li, Heyu Wang, Boxue Du
Summary: This article examines the impact of poly cyclic aromatic compounds (PACs) on the electrical treeing of cross-linked polyethylene (XLPE) insulation in high voltage (HV) cables. The study finds that the inclusion of PACs in XLPE insulation inhibits the growth of electrical trees and reduces the amplitude of partial discharges (PDs) during treeing. Additionally, under cyclic temperature conditions, the growth of electrical trees in XLPE/PACs composites stagnates as the temperature decreases. The research suggests that PACs enhance the resistance of XLPE/PACs composites against electrical treeing.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Electrical & Electronic
Jin Li, Pengxiang Guo, Xiaoxiao Kong, Yifang Wang, Yong Yang, Fang Liu, Boxue Du
Summary: In this study, the effect of the curing accelerator Tris-(dimethylaminomethyl) phenol (DMP-30) content on the curing behavior and dielectric properties of DGEBA/MHHPA system was investigated. It was found that the accelerator content has a saturation effect on the dielectric properties, and excessive content leads to an increase in dielectric constant and loss, and a decrease in breakdown strength. The cured sample with 0.5% accelerator addition showed the best dielectric properties and the highest breakdown strength, indicating that the optimum accelerator content allows for a more rational curing crosslinking network.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Chemistry, Analytical
Xubin Lu, Xin Yang, Limin Wang, Fan Li, Haojie Zhang, Jia Li, Lingxing Zan, Michael Bron
Summary: Nitrogen-doped carbon nanotubes deposited on nickel foam are investigated as catalysts for hydrogen and oxygen evolution reactions. The study shows that nitrogen-doped carbon nanotubes with high amounts of graphitic nitrogen have the potential to improve hydrogen electrocatalytic performance and provides a direction for designing better carbon nanotube defects to enhance electrochemical performance.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Lingwei Zeng, Limin Wang, Jicheng Qin, Yi Ren, Honglin Li, Xubin Lu, Feiping Lu, Junfeng Tong, Jianfeng Li
Summary: Using inexpensive and environmentally friendly L-cystine as the electron transport layer (ETL) can significantly improve the performance of organic solar cells (OSCs), including open circuit voltage, short circuit current density, fill factor, and power conversion efficiency. L-cystine modifies the work function of aluminum, thereby more effectively extracting and collecting carriers, making it a strong competitor for ETL in high-efficiency OSCs.
Article
Materials Science, Multidisciplinary
Jin Liu, Xingpeng Liu, Can Chen, Qian Wang, Honglin Li, Yi Ren, Haojiang Shen, Xubin Lu, Chunyan Yang, Junfeng Tong, Jianfeng Li
Summary: In this study, three new n-type polymeric interfacial materials with self-doping effects were designed and synthesized, and applied as cathode interface layers (CILs) in high-performance organic solar cells. The position and number of polar groups were found to significantly affect the electrical conductivity, tunable work function, and interfacial interactions of these materials.
Article
Materials Science, Multidisciplinary
Xingpeng Liu, Yichun Peng, Zezhou Liang, Limin Wang, Shenghui Han, Zheng Dou, Xubin Lu, Junfeng Tong, Jiangang Liu, Jianfeng Li
Summary: The PM6:TBFCl50-BDD:IT-4F-based ternary device with non-halogenated solvent o-xylene and a similar structure component TBFCl50-BDD demonstrated enhanced crystallinity, improved charge transport and collection ability, and effective suppression of trap-assisted recombination and bimolecular recombination. The introduction of TBFCl50-BDD also accelerated exciton diffusion and promoted exciton dissociation, leading to a higher power conversion efficiency (PCE) of 12.8% compared to the PM6:IT-4F binary device (11.8%).
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Composites
Renyong Zhao, Yun Chen, Jin Li, Songtao Liu, Yuhuai Wang, Xiaoxiao Kong, Boxue Du
Summary: In this study, the L-shaped needle-wire electrode was used to simulate the coupling direction of mechanical stress and electric field in GFRP composites. The effects of equivalent tension and compression load on the electrical tree degradation of GFRP were obtained. It was found that both tension and compression load aggravated the electrical tree degradation, and the combined action of high temperature and high pressure and external mechanical load accelerated the degradation process.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Electrochemistry
Simon -Johannes Kinkelin, Matthias Steimecke, Emil Dieterich, Michael Bron
Summary: A non-noble metal catalyst (Fe-Nx@MWCNTs) and functionalized multi-walled carbon nanotubes (MWCNTs) were investigated for their performance in the oxygen reduction reaction (ORR) in neutral media and their structural properties during electrochemical forced degradation. Different methods, including electroanalytical methods, in situ-Raman microscopy, and ex situ-X-ray photoelectron spectroscopy (XPS), were used in a two-stage accelerated stress test (AST). It was found that the Fe-Nx complex experienced leaching of the iron central atom during the first stage of the AST, resulting in a decline in ORR activity. The second stage involved stronger electrochemical stress, leading to the formation of surface groups and the destruction of catalytic N-C moieties.
ELECTROCHIMICA ACTA
(2023)
Article
Physics, Applied
Jianan Dong, Boxue Du, Hucheng Liang, Hang Yao
Summary: This paper develops a multi-dimensional functionally graded material (MFGM) to improve the insulation performance of the epoxy insulator. Results show that the MFGM insulator has higher AC and DC flashover voltages compared to the uniform insulator, making it suitable for gas insulated switchgear in high voltage direct current systems.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Emil Dieterich, Lukas Herrmann, Olga Dzhyginas, Lukas Binnenbose, Matthias Steimecke, Simon-Johannes Kinkelin, Michael Bron
Summary: In this study, the electrochemical carbon dioxide reduction reaction (CO2RR) over carbon-supported gold nanoparticles (AuNP) was thoroughly investigated using a combination of different analytical methods. The study confirmed the presence of different CO2RR mechanisms, particularly in the low-overpotential region, and demonstrated the effectiveness of the multiple methods used.
ANALYTICAL CHEMISTRY
(2023)
Article
Mechanics
Jin Li, Renyong Zhao, Yuhuai Wang, Yun Chen, Xiaoxiao Kong, Boxue Du
Summary: Glass fiber-reinforced epoxy composites (GFREC) are commonly used in electrical and electronic devices due to their lightweight, high strength, excellent insulation properties, and corrosion resistance. Researching the electrical degradation dynamics of GFREC is crucial in preventing insulation failure. In this study, composite samples were prepared using vacuum impregnation, and the morphology and statistical characteristics of electrical degradation were discussed. The results showed that electrical trees in GFREC develop towards the fiber side and grow rapidly along the interface, with interfacial orientation affecting tree growth. The electric field distribution and fiber orientations were found to be related to electrical degradation.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Boxue Du, Zhijun Guo, Hucheng Liang
Summary: This study experimentally investigates the breakdown mechanism of tri-post insulators under electromechanical coupling and explores the effects of external force, fixing mode, and defect location on the breakdown morphologies. The results show that initial defects can lead to partial discharges that develop into bursting breakdown, and mechanical stress distribution and defect location influence the breakdown morphology.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Electrical & Electronic
Hang Yao, Boxue Du, Hucheng Liang, Jianan Dong
Summary: This study discusses the application of multidimensional functionally graded materials in offshore HVDC GIS, which can reduce electric field concentration and increase flashover voltage by adjusting the conductivity and permittivity distributions.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Electrical & Electronic
Boxue Du, Wenjin Zhang, Hucheng Liang
Summary: In this study, the treeing characteristics of epoxy resin were examined under different mechanical stresses. Results showed that tensile stress accelerated tree branch growth, while compressive stress had a closing and suppressing effect. However, excessive compressive stress led to shear stress dominance and promoted tree branch growth at certain angles. The direction of mechanical stress influenced the electrical tree length and width. The research findings have significant implications for analyzing breakdown in gas-insulated transmission lines.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Polymer Science
You Wu, Boxue Du, Zhonglei Li, Heyu Wang, Zhong Zheng
Summary: This paper focuses on using α-nucleating agents to modulate the heterogeneous mesoscopic structure of polypropylene insulation, which effectively improves its dielectric strength. Experimental results show that the addition of α-nucleating agents reduces spherocrystal size, increases density, and enhances electric field uniformity. Moreover, the increase in spherocrystal density inhibits electrical tree growth, leading to an increase in breakdown strength. Simulation results demonstrate that the difference in dielectric properties between crystal and amorphous regions triggers electric field distortion and insulating degradation.
