Article
Chemistry, Multidisciplinary
Guannan Liu, Sungwoo Sohn, Naijia Liu, Arindam Raj, Udo D. Schwarz, Jan Schroers
Summary: A thermomechanical method for the controlled growth of single-crystal nanowire arrays is reported, enabling simultaneous synthesis, alignment, and patterning of nanowires. This method allows for the integration of all fcc and bcc materials as single crystals into devices by controlling the crystal structure through the substrate.
Article
Chemistry, Multidisciplinary
Arindam Raj, Naijia Liu, Guannan Liu, Sungwoo Sohn, Junxiang Xiang, Ze Liu, Jan Schroers
Summary: This study demonstrates low-temperature nanomolding utilizing enhanced diffusivity on eutectic interfaces, enabling the molding of gold nanorods at room temperature and expanding the range of materials that can be practically nanofabricated.
Article
Materials Science, Multidisciplinary
Andrew J. Birnbaum, Anna K. Rawlings, John C. Steuben, Athanasios Iliopoulos, John G. Michopoulos
Summary: This study aims to investigate the mechanism of plastic strain generation in nickel single crystals during laser processing. The use of ultra-high purity nickel single crystals simplifies the analysis by minimizing dislocation interactions with grain boundaries or solutes.
Article
Materials Science, Multidisciplinary
Benqi Jiao, Qinyang Zhao, Yongqing Zhao, Laiping Li, Zhongwu Hu, Xuanqiao Gao, Wen Zhang, Jianfeng Li
Summary: The slip behavior and mechanism of large-size Mo-3Nb single crystal at room temperature were investigated, revealing a transition from shallow non-uniform slip lines to dense and uniform slip bands with increased deformation. The disparities in mobility between screw segments and edge segments due to double cross-slip multiplication mechanism account for the observed different slip features. During slip deformation, screw dislocations dominate and tend to form wall-substructures, evolving into dislocation cells with higher stability through dislocation accumulation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Tianchang Ma, Kentaro Chahara, Jingya Wu, Tomotaka Miyazawa, Toshiyuki Fujii
Summary: The study finds that DBI and DBII have different types, representing the primarily activated slip plane and the combination of activated primary and coplanar slip systems. The formation planes of CBs are perpendicular to the cross-slip plane and parallel to the primary slip direction. The highly symmetrical characteristics of multiple-slip-oriented single crystals can lead to inconsistent correspondences between DBs and CBs.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Christopher C. Tisdell
Summary: Recently, Mandal and Ghosh (Phys. Fluids 35, 047121, 2023) presented perturbation solutions for viscous flow in porous channels with a slip condition limited to slow wall dilation-contraction rates. In this study, we demonstrate that this slowness assumption can be completely eliminated. By doing so, we develop a more widely applicable and accurate perturbation scheme for all dilation-contraction rates. Our approach involves generating new exact solutions to the linear, inviscid problem with slip condition and utilizing them to construct more accurate perturbation expansions for the nonlinear flow model.
Article
Materials Science, Multidisciplinary
Naoki Takata, Shintaro Uesugi, Tianqi Zhu, Socihiro Takeyasu, Asuka Suzuki, Makoto Kobashi
Summary: To study the influence of dislocation substructures on the size-dependent strength of micron-sized metals, single-crystal cylindrical micropillars with different diameters ranging from 1 to 10 μm were fabricated on fully annealed and cold-rolled high-purity aluminum samples. The annealed micropillars showed a size dependence of the resolved shear stress, while the correlation was weakened in the cold-rolled specimens. The presence of fine dislocation substructures introduced by cold-rolling contributed to the reduction in size-dependent strength, which can be explained using a stochastic model of dislocation source length and the assumption of homogeneously distributed dislocations in the experimental micropillars.
MATERIALS TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Mehrdad T. Kiani, Quynh P. Sam, Yeon Sik Jung, Hyeuk Jin Han, Judy J. Cha
Summary: With shrinking dimensions in integrated circuits, sensors, and functional devices, there is a need to develop nanofabrication techniques with simultaneous control of morphology, microstructure, and material composition over wafer length scales. This study extends the thermomechanical nanomolding (TMNM) technique for wafer-scale fabrication of 2D nanostructures. Nanomolded structures with high aspect ratio and single-crystal Cu were successfully achieved, and the deformation mechanism during molding is discussed based on the retained microstructures.
Article
Materials Science, Multidisciplinary
Hiroshi Masuda, Koji Morita, Makoto Watanabe, Toru Hara, Hidehiro Yoshida, Takahito Ohmura
Summary: The micro mechanical properties of nontransformable tetragonal zirconia were characterized through compression experiments, revealing different deformation mechanisms in different strain directions. The study also investigated the reasons behind the enhanced toughness of t' zirconia.
Article
Materials Science, Multidisciplinary
Xiaoqing Li, John Turner, Karen Bustillo, Andrew M. Minor
Summary: The study utilized in situ TEM to observe nanostructural changes in single crystal nickel under mechanical and electrical stimuli to elucidate the mechanisms of electroplasticity. Findings indicate that pulsed electrical current delays stress concentration formation and leads to more uniform plasticity deformation.
Article
Nanoscience & Nanotechnology
Bohan Wang, Takumi Kimura, Tomotaka Miyazawa, Shigeo Arai, Toshiyuki Fujii
Summary: Metallic structures are prone to fatigue-related failure due to damage caused by dislocation structures. Investigation of dislocation structures is important for understanding the fatigue process. This study analyzed the formation mechanism of dislocation structures in [111] single crystal copper and their relationship with fatigue behavior under different plastic shear strain amplitudes. The results showed the development of vein-like and wall structures and the formation of deformation and cell bands. The cell band development had a significant impact on the cyclic softening of the single crystal copper, with a positive linear relationship existing between shear stress amplitude and reciprocal of cell width.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Ronan Madec, Luc Portelette, Bruno Michel, Jonathan Amodeo
Summary: The mechanical behavior of UO2 single crystal, especially the unexpected multi-slip observations, has been studied in this research. A multi-scale model based on composite slip is proposed, in which dislocation density can be transferred from primary slip systems to secondary systems under the effect of cross-slip. This approach accurately describes the anisotropic mechanical response of UO2 single crystal, providing new insights into the links between dislocation microstructures and mechanical properties. The composite slip mechanism appears to be a candidate for explaining unexpected plastic behaviors in complex materials with multiple slip modes, suggesting that slip activation may be more complex than in usual constitutive laws.
Article
Nanoscience & Nanotechnology
L. -B He, S. Yang, L. Shangguan, J. -H. Zhu, L. Shi, L. Zhang, L. -P. Tang, J. Sun, H. -T. Zhang, L. -T. Sun
Summary: Metal nanocrystals exhibit antithetical mechanical behaviors, with smaller crystals either showing increased strength or decreased strength. The mechanisms governing these behaviors, including dislocation-starvation induced strengthening and surface diffusion induced softening, are not fully understood. To investigate this, sub-20-nm Au and Co nanocrystals were studied using electrical loading-coupled transmission electron microscopy to create variable temperature conditions. It was found that surface diffusion is more temperature-sensitive than dislocation activities and deformation mechanisms transition when surface diffusion is activated or inhibited. At elevated temperatures, the nanocrystals exhibit liquid-like behaviors with consecutive surface reshaping or collapse-and-reconstruction shape transformations taking place. (c) 2023 Elsevier Ltd. All rights reserved.
MATERIALS TODAY NANO
(2023)
Article
Materials Science, Multidisciplinary
Emile Maras, Emmanuel Clouet
Summary: The plasticity in hexagonal close-packed zirconium is controlled by screw dislocations, which easily glide in prismatic planes and occasionally across-slip in other planes at high temperatures. Molecular dynamics simulations reveal a combination of prismatic and pyramidal slip in the high stress regime, with basal slip favored at low stress levels due to a change in the glide mechanism.
Article
Engineering, Manufacturing
Zhaopeng Hao, Zaizhen Lou, Yihang Fan
Summary: This study investigated the evolution mechanism of subsurface defects in nickel-based single crystal alloy during ultra-precision cutting with a silicon nitride tool using molecular dynamics. It was found that increasing cutting speed can reduce the number and area of subsurface defects, improving the quality of machined parts. Different crystal orientations and cutting depths result in varying types and quantities of defects, with more defects produced in the subsurface region under the (010) 001 crystal orientation.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Weidong Yan, Wengen Ouyang, Ze Liu
Summary: Structural superlubricity based on twisted layered materials has attracted significant research interest. Molecular dynamics simulations reveal a strong correlation between the size scaling of friction and Moire '-level oscillations in circular twisted bilayer graphene (tBLG). By proposing a theoretical formula and deriving an analytic expression, we successfully explain the observed abnormal scaling and provide a rational explanation for the measured scattered power scaling law in various experiments. Additionally, we demonstrate that the origin of the scaling law is related to the Moire ' boundary, highlighting its importance in the thermodynamic models of layered materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Bozhao Wu, Yupeng Wu, Yangyang Pan, Ze Liu
Summary: In this study, experiments and molecular dynamic simulations were conducted to understand the atomic physical process and deformation mechanism in the nanoscale deformation of crystalline metals. The flow of metals into nanocavities was quantified by the aspect ratio of molded micro-/nanorods. It was found that the critical forming pressure is determined by the entering barrier, and the molding efficiency increases with decreasing cavity size.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Multidisciplinary
Seyed Hesam Mousavi, Kaifei Chen, Jie Yao, Ali Zavabeti, Jefferson Zhe Liu, Gang Kevin Li
Summary: A study identified Li+-RRO-3 zeolite as a highly selective and adsorbent material for separating N2 from CH4, offering a promising solution for the removal of N2 contaminants in natural gas.
Article
Chemistry, Multidisciplinary
Fangqi Chen, Jiacheng Yao, Xujie Wang, Shuangshuang Wang, Ze Liu, Tao Ding
Summary: Nonvolatile phase change materials have great potential in nanophotonic switches and memory devices. However, their performances deteriorate at thicknesses below 10 nm due to local deformation. In this study, we addressed this issue by photothermally modulating the refractive index of germanium antimony telluride (GST) in plasmonic nanogaps, achieving highly reversible optical switching at a rate of up to hundreds of kHz. We also demonstrated the modulation of waveguiding efficiency using GST-based photothermal modulation, providing a promising approach for integrated nanophotonic chips.
Article
Multidisciplinary Sciences
Zhuyuan Wang, Xue Yan, Qinfu Hou, Yue Liu, Xiangkang Zeng, Yuan Kang, Wang Zhao, Xuefeng Li, Shi Yuan, Ruosang Qiu, Md Hemayet Uddin, Ruoxin Wang, Yun Xia, Meipeng Jian, Yan Kang, Li Gao, Songmiao Liang, Jefferson Zhe Liu, Huanting Wang, Xiwang Zhang
Summary: The authors demonstrate a scalable method for producing monolayer nanosheets by ball-milling exfoliation with the assistance of viscous polyethyleneimine (PEI) liquid. By effectively exfoliating graphite into graphene nanosheets, they achieved a high monolayer percentage of 97.9% at a yield of 78.3%. The universality of this technique was proven by successfully exfoliating other layered materials such as carbon nitride, covalent organic framework, zeolitic imidazolate framework, and hexagonal boron nitride.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Xingya Li, Gengping Jiang, Meipeng Jian, Chen Zhao, Jue Hou, Aaron W. W. Thornton, Xinyi Zhang, Jefferson Zhe Liu, Benny D. D. Freeman, Huanting Wang, Lei Jiang, Huacheng Zhang
Summary: In this study, a strategy for fabricating angstrom-scale ion channels through the growth of metal-organic frameworks (MOFs) into nanochannels is reported. These nanochannels exhibit higher ion conductivity and mobility than MOF channels with hybrid pore configurations and sizes. Furthermore, the three-dimensional (3D) MOF channels demonstrate better ion sieving properties compared to one-dimensional (1D) and two-dimensional (2D) MOF channels. This research provides a platform for studying ion transport properties at angstrom-scale confinement and offers guidelines for improving ionic separations and nanofluidics efficiency.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jing Li, Bintong Huang, Yuanhao Wang, Aijia Li, Yong Wang, Yangyang Pan, Jia Chai, Ze Liu, Yueming Zhai
Summary: The single-molecule technique for investigating unlabeled proteins in solution is challenging, but nanopore sensing offers a label-free tool for collecting structural information. This study developed a reliable method to convert a silicon nitride nanopore into a stable nanonet platform for single-entity sensing. The nanonet provides more structural information and captures the UV-light-induced structural-change process of individual proteins.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jing-Yu Xu, Peng-Cheng Zhang, Rong Guo, Li-Xue Liu, Yong-Ping Kang, Ze Liu, Cheng Zhang, Lin Liu
Summary: This study investigates the effect of structural heterogeneity derived from additive manufacturing process on the mechanical properties of Al alloys. Elaborately designed Al-Fe-Cu-xZr alloys were subjected to laser powder bed fusion. It is found that the alloys exhibit heterogeneous structures with two distinct zones, and the Al-Fe-Cu-0.8Zr alloy shows the best combination of high yield strength, plasticity, and resistance to crack propagation. The enhanced fracture toughness is attributed to the difference in local hardness at the interfaces between the two zones. This work provides a promising strategy for toughening additively manufactured Al alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Chuang Yang, Peiyao Wang, Zhiyuan Xiong, Xin Wu, Hui Chen, Jing Xiao, Guangmin Zhou, Lixin Liang, Guangjin Hou, Dan Li, Jefferson Zhe Liu, Hui-Ming Cheng, Ling Qiu
Summary: Researchers used a micro-stamping method to create a perpendicular micro-hole array in a thick, dense MoS2-based electrode, improving the efficiency of ion transport in 2D nanosheet-based films. The electrode exhibited high capacity, density, and conductivity, making it suitable for high-capacity supercapacitors.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiacheng Yao, Hui Fang, Yong Li, Ze Liu, Hongxing Xu, Tao Ding
Summary: In this study, single-crystalline aluminum nanowires with high stability were fabricated using a superplastic nanomolding technique. These nanowires exhibit multimode waveguiding, efficient beam splitting based on polarization, and durable thermal optical modulation, making them suitable for nanophotonic routers, splitters, and information encryptors. This technique can also be extended to other metals, enhancing the development of functional nanophotonic devices and integrated optical chips.
Article
Chemistry, Multidisciplinary
Jianxin Liu, Xiaoqi Yang, Hui Fang, Weidong Yan, Wengen Ouyang, Ze Liu
Summary: This article reviews the latest advances in in situ twistronics, discussing the underlying superlubricity mechanism and showcasing real-time twistronic testing under a scanning electron microscope. The study shows that the real-time testing technique allows for visualizing and monitoring the interface status. By leveraging the tribological properties of van der Waals layered materials, this novel platform not only improves the fabrication of twistronic devices but also enhances the understanding of interface phenomena. Moreover, this platform holds promising opportunities for integrating twistronics into various mechanical frameworks.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yukihiro Endo, Xue Yan, Meng Li, Ryota Akiyama, Christian Brandl, Jefferson Zhe Liu, Rei Hobara, Shuji Hasegawa, Weishi Wan, K. S. Novoselov, Wen-Xin Tang
Summary: Lithium intercalation in a graphene/buffer system on SiC locally changes the stacking order from AB/BA to AA and drives dynamic motions of topological domain walls constructed between the lithium-intercalated domains. Stacking engineering in van der Waals (vdW) materials is a powerful method to control topological electronic phases for quantum device applications. Our work reveals moving topological domain walls protected by the topology of stacking and lays the foundation for controlling the stacking structure via atomic intercalation.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Chenghai Lu, Chengzhi Hu, Zhibin Chen, Peiyao Wang, Fan Feng, Guangzhi He, Fuyi Wang, Yanyan Zhang, Jefferson Zhe Liu, Xiwang Zhang, Jiuhui Qu
Summary: In this study, we investigate the transport of three typical anions under confinement and reveal that dehydration and related ion-pore interactions play a crucial role in anion-selective transport. We show that strongly hydrated ions have hindered transport due to their enhanced ion effective charge, while weakly hydrated ions have greater permeability. Our findings suggest that precisely regulating ion dehydration can enable the development of ideal ion-selective membranes.
Article
Materials Science, Multidisciplinary
Sungwoo Sohn, Naijia Liu, Geun Hee Yoo, Aya Ochiai, Jade Chen, Callie Levitt, Guannan Liu, Samuel Charles Schroers, Ethen Thomas Lund, Eun Soo Park, Jan Schroers
Summary: This study introduces a theoretical framework for plasticity in metallic glasses, aiming to quantify their plastic behavior. By measuring and calculating the stress gradient del(US), the ability of metallic glasses to undergo plastic deformation can be determined in comparison to the applied stress field gradient del(app).
Article
Chemistry, Multidisciplinary
Xianglin Liu, Yuanpeng Yao, Wenting Li, Yu Zhang, Ze Liu, Huayi Yin, Dihua Wang
Summary: In this work, Co2B/MoB2 heterostructured nanoclusters were prepared and used as highly efficient hydrogen evolution reaction (HER) catalysts. The optimized Co2B/MoB2 catalyst exhibited low overpotentials and long-term catalytic stability in both acidic and alkaline environments. The modified electronic structure at the Co2B/MoB2 heterointerface played a crucial role in enhancing the HER activity. Density functional theory calculations supported the experimental results and provided insights into the catalytic mechanism.
