Article
Engineering, Mechanical
Qinghua Li, Bokun Chen, Shilang Xu, Fei Zhou, Xing Yin, Xiao Jiang, Ping Wu
Summary: This study aims to enhance blast resistance of construction structures using ultra-high toughness cementitious composite (UHTCC) with significant strain-hardening behavior. Experimental results show UHTCC slabs outperform RC slabs in blast resistance, and unstructured discretizations in the finite element model demonstrate better agreement with experimental results.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Takuro Tokunaga, Amun Jarzembski, Takuma Shiga, Keunhan Park, Mathieu Francoeur
Summary: This paper investigates the extreme near-field heat transfer between metallic surfaces and finds that the role of phonons and electrons in heat transfer varies under different bias voltages. It suggests that well-controlled measurements between metallic surfaces are needed to quantify the contributions of phonons and electrons to heat transfer.
Article
Engineering, Mechanical
Yulian Jiang, Yangzhen Gao, Zhiguo Feng
Summary: Studies show that stable electrical contact between a graphite cylinder and a copper electrode is crucial for welding heating cables. A novel numerical approach using fractal theory to analyze different materials and geometrical properties was developed and validated through experiments. The proposed model accurately predicts the dynamic characteristics of the contact between the graphite cylinder and the copper electrode in the welding cores of heating cables.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Soo Young Park, Rajinder Singh-Moon, Haiqiu Yang, Deepak Saluja, Christine Hendon
Summary: This study evaluated the use of NIRS-integrated RFA catheters for monitoring lesion progression, both ex vivo and in vivo. The results showed that the predictive model based on spectral features correlated well with measured lesion dimensions, and the in vivo pilot studies demonstrated consistent contact discrimination and accurate lesion depth parameters. NIRS-empowered catheters are well suited for monitoring myocardial response to RF ablation and optimizing treatment efficacy.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Aerospace
Tongge Wen, Xiangyuan Zeng
Summary: This study explores the hopping dynamics of a lander in single-tidal-locked binary asteroid systems. A coupled orbit-attitude dynamical model of the lander in the body-fixed frame of the secondary is established, taking into account non-spherical perturbations from the two bodies. Using an approximate model where the binary system is considered as an oblate spheroid-ellipsoid system, numerical simulations are conducted to examine the motion characteristics of lander deployment to the secondary while varying the primary mass and system period. Two dynamical parameters related to the characteristic properties of the binary system are introduced, providing a measure for estimating hopping evolution in different binary systems.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Physics, Multidisciplinary
T. E. Kidd, P. Lukashev, L. Stuelke, C. Gorgen, S. Roberts, G. Gu, A. J. Stollenwerk
Summary: The stability and diffusion of ultra-thin thermally deposited Au films on Bi2Se3 were studied, revealing that at high temperatures Au diffuses across the surface and forms larger nanostructures.
Article
Chemistry, Physical
Ying Zhang, Jingqin Wang, Yancai Zhu, Defeng Cui, Ningyi Lu
Summary: This study investigates the effect of doping elements on the welding performance of Ag/Ni contact material through first principles of density functional theory and experimental methods, and the results are validated in both theoretical and experimental aspects.
Article
Energy & Fuels
Changhyun Lee, Jiyeon Hyun, Jiyeon Nam, Seok-Hyun Jeong, Hoyoung Song, Soohyun Bae, Hyunju Lee, Jaeseung Seol, Donghwan Kim, Yoonmook Kang, Hae-Seok Lee
Summary: The research proposes using a thin layer of amorphous silicon in TOPCon solar cells to reduce parasitic absorption, and improving solar cell performance by modifying the timing and temperature of the annealing step. In tandem cell applications, a semitransparent perovskite cell can be used as a filter for absorption in the NIR region.
Article
Engineering, Multidisciplinary
Dongdong Chen, Linsheng Huo, Gangbing Song, Shuli Fan
Summary: This paper proposes a novel method to analyze the mechanical behavior of the coin-tap test using the principle of pounding mechanics. It simplifies the mathematical model of the test and derives expressions for impact force and impact time. The paper also introduces an equivalent impact stiffness-based damage index to predict the severity and location of near-surface damages. Validation experiments demonstrate the effectiveness of the proposed method.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Mechanical
Taijiang Chen, Guangcheng Zhang, Xin Xiang
Summary: This study successfully obtains the time-history solution method for rockfall collision parameters by examining the rockfall collision process, which is of great significance for accurately predicting the route of rockfall and selecting protective measures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Mechanical
Daoming Wang, Yan Xiong, Bin Zi, Sen Qian, Zhengyu Wang, Weidong Zhu
Summary: This paper presents the design, analysis and experiment of a passively adaptive five fingered underactuated dexterous hand (UADH). The UADH has the ability to powerfully grasp objects with different shapes and sizes. Experimental results demonstrate its good dexterity, adaptability, and strong fingertip grasping ability.
MECHANISM AND MACHINE THEORY
(2021)
Article
Engineering, Chemical
Jian Chen, Dominik Krengel, Daisuke Nishiura, Mikito Furuichi, Hans-Georg Matuttis
Summary: Studying the collective behavior of adhesive particles using the discrete element method (DEM) requires reliable force-displacement relations (force models). In this study, we develop a novel force-displacement relation based on the Johnson-Kendall-Roberts (JKR) theory, utilizing intermediate functions to calculate the force from displacement. We also analyze contact geometry errors, derive the exact contact centroid, and propose a smoothed JKR model to address discontinuities in force and energy. Our analysis lays the foundation for contact-mechanics-based force models in DEM simulations of adhesive particles, enabling investigation of their collective behavior.
Article
Materials Science, Multidisciplinary
Niklas Hofmann, Leonard Weigl, Johannes Gradl, Neeraj Mishra, Giorgio Orlandini, Stiven Forti, Camilla Coletti, Simone Latini, Lede Xian, Angel Rubio, Dilan Perez Paredes, Raul Perea Causin, Samuel Brem, Ermin Malic, Isabella Gierz
Summary: Ultrafast charge separation after photoexcitation is a common phenomenon in various van-der-Waals heterostructures with great relevance for future applications in light harvesting and detection. Theoretical understanding of this phenomenon converges towards a coherent mechanism through charge transfer states accompanied by energy dissipation into strongly coupled phonons. The detailed microscopic pathways are material specific as they sensitively depend on the band structures of the individual layers, the relative band alignment in the heterostructure, the twist angle between the layers, and interlayer interactions resulting in hybridization.
Article
Engineering, Electrical & Electronic
Carlo Silvestri, Lorenzo Luigi Columbo, Massimo Brambilla
Summary: We conducted a numerical and analytical study on the self-detection scattering type near field optical microscopy (SD s-SNOM), a new technique that combines self-mixing interferometry and scattering near-field microscopy. By using a modified version of the Lang-Kobayashi model, we focused on the weak feedback regime and derived an approximated method for retrieving the scattering coefficient of the SD s-SNOM configuration applied to a CsBr sample. These results were then used to estimate the dielectric permittivity and phonon resonances of the sample, demonstrating good accuracy.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Physical
Syed Hassan Abbas Jaffery, Muhammad Riaz, Zeesham Abbas, Ghulam Dastgeer, Sikandar Aftab, Sajjad Hussain, Muhammad Ali, Jongwan Jung
Summary: This study demonstrates the strong interlayer transition and excellent broadband photodetection of the GeSe/MoTe2 van der Waals (vdW) heterojunction. The spatial segregation of photogenerated electron-hole pairs is enabled by the formation of staggered band alignment. The heterojunction exhibits outstanding optoelectronic characteristics and can be used as a logic inverter. The findings of this study will be crucial for the development of multifunctional vdW heterostructure devices.
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
You Li, Zhongcheng Lei, Yong He, Ze Liu
Summary: This work presents a comprehensive virtual experiment method for detecting material deformation and failure. By integrating commonly used equipment into a web-based system, users can experience an immersive and interactive learning environment. The system provides clear guidance for the experiment, highlighting the equipment/specimen to be used and marking the pathway. It also offers interactive and visualized experiments for users at different levels.
JOVE-JOURNAL OF VISUALIZED EXPERIMENTS
(2023)
Article
Multidisciplinary Sciences
Fangfang Deng, Juntao Chen, Junxiang Xiang, Yong Li, Yan Qiao, Ze Liu, Tao Ding
Summary: Researchers have successfully achieved light-programmed control of bistate colloidal actuation using photothermal active plasmonic substrate, which helps to mimic and understand natural complex systems.
Article
Chemistry, Physical
Fuwang Wen, Yuan Yan, Shirong Sun, Xu Li, Xing He, Qingwei Meng, Jefferson Zhe Liu, Xueqing Qiu, Wenli Zhang
Summary: Nitrogen doping enhances the capacitive performance of zinc-ion hybrid supercapacitor by promoting pseudocapacitive reactions through lowering the energy barrier for the change of oxidation states of carbonyl moieties. The as-constructed zinc-ion hybrid supercapacitors, with nitrogen/oxygen dopants and 3D interconnected hierarchical porous carbon matrix, exhibit high gravimetric capacitance and excellent rate capability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Peng Li, Yuanpeng Yao, Wengen Ouyang, Ze Liu, Huayi Yin, Dihua Wang
Summary: In this study, a FeCoNiMnMo high entropy alloy (HEA) electrode was prepared for stabilizing oxygen evolution in chlorine-containing electrolytes without corrosion inhibitors. The electrode exhibited excellent electrocatalytic activity and stability, with the protective layer containing K2MoO4 playing a crucial role in chlorine resistance. Additionally, the high-entropy effect of the HEA reduced alloy dissolution.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Zhicheng Feng, Yuanpeng Yao, Jianxin Liu, Bozhao Wu, Ze Liu, Wengen Ouyang
Summary: An anisotropic interlayer potential is developed to accurately describe the van der Waals interaction between water and graphene. The force field is benchmarked against density functional theory and shows good agreement with reference data sets, indicating improved empirical description of water-graphene interfacial interactions. Molecular dynamics simulations based on this force field predict water contact angles that are close to experimental measurements, demonstrating the hydrophilic nature of graphene. This theoretical approach can be extended to study the wetting properties of heterointerfaces formed with water and other two-dimensional materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yunfei Hong, Junkai Deng, Xiangdong Ding, Jun Sun, Jefferson Zhe Liu
Summary: In this study, the ferroelectric polarization in bismuthene nanoribbons was investigated using first-principles calculations, and a width size limiting effect arising from edge effects was discovered. The decrease in width led to the spontaneous transformation of the zigzag and armchair paired nanoribbons into high-symmetric nonpolarized nanoribbons. The phase transition mechanism involving depolarization field and edge stress provides insights for achieving phase transition and ultrahigh piezoelectricity in Bi nanoribbons through strain engineering, which could enable new applications for 2D ferroelectric devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Diyan Liu, Zhiyuan Xiong, Peiyao Wang, Qinghua Liang, Haijin Zhu, Jefferson Zhe Liu, Maria Forsyth, Dan Li
Summary: This study investigates the relationship between ion concentration and pore size in multilayered graphene membranes (MGMs) using nuclear magnetic resonance and computational simulations. The results show that the concentration of chaotropic ions increases with decreasing nanoslit size, while the concentration of kosmotropic ions and other ions decreases or changes slightly. In addition, anions remain more concentrated than counter ions, leading to electroneutrality breakdown and unipolar anion packing in MGMs.
Article
Multidisciplinary Sciences
Guanghui Cao, Jingjing Liang, Zenglong Guo, Kena Yang, Gang Wang, Huiliu Wang, Xuhao Wan, Zeyuan Li, Yijia Bai, Yile Zhang, Junlin Liu, Yanpeng Feng, Zhenying Zheng, Cai Lu, Guangzhi He, Zeyou Xiong, Ze Liu, Shengli Chen, Yuzheng Guo, Mengqi Zeng, Junhao Lin, Lei Fu
Summary: High-entropy alloy nanoparticles (HEA-NPs) with different metal elements were synthesized using liquid metal with negative mixing enthalpy as a dynamic mixing reservoir, enabling the exploration and optimization of their properties for various applications. The versatile elements used have a wide range of atomic radii and melting points. The real-time conversion process from liquid metal to crystalline HEA-NPs was captured in situ, confirming a dynamic fission-fusion behavior during alloying.
Article
Chemistry, Physical
Hualin Zhan, Richard Sandberg, Fan Feng, Qinghua Liang, Ke Xie, Lianhai Zu, Dan Li, Jefferson Zhe Liu
Summary: Machine learning can be used to establish a physics-based nanocircuit model, allowing for the prediction and evaluation of electrical characteristics in nanoporous ionic systems. This approach provides insights into ion dynamics in nanoporous electrodes, such as nonideal cyclic voltammetry and dynamic, pore-size-dependent surface conductance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Jun-Xiang Xiang, Ze Liu
Summary: Understanding and controlling the flow of materials in confined channels is important in science and engineering. The no-slip boundary condition makes it more challenging to drive flow at the nanoscale, especially for highly viscous liquids. This study reports the observation of a large boundary slip in the nanoscale flow of highly viscous supercooled liquid metals, enabled by hydrophobic treatment of smooth nanochannels. The slip length depends on the pressure, which can be explained by shear-dependent viscosity.
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)