Article
Engineering, Manufacturing
Xiaopei Wang, Weiting Li, Yingjie Yao, Luyao Fan, Jinhua Wang, Weiyi Wang, Pengyu Wen, Zhigang Yang, Hao Chen
Summary: In this study, low-density ultrahigh-strength steels (LD-UHSS) were designed and fabricated using laser powder bed fusion with in-situ alloying. The addition of aluminum reduced the density and significantly strengthened the LD-UHSS through the precipitation of the B2 phase. The laser additive manufacturing process resulted in the formation of fine metastable retained austenite, contributing to improved ductility. By tailoring key phases, the mechanical performance of LD-UHSS can be effectively optimized.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Mechanical
D. J. Magagnosc, J. T. Lloyd, C. S. Meredith, A. L. Pilchak, B. E. Schuster
Summary: The study reported the first in situ X-ray diffraction observations of DRX, revealing that DRX initiation is driven by accumulation of plastic strain rather than temperature rise. The results showed a continuous evolution of microstructure with increasing plastic strain, until reaching maximum stress.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Nanoscience & Nanotechnology
S. J. Wang, D. Y. Xie, J. Wang, A. Misra
Summary: The study revealed that the deformation behavior of nanoscale laser processed Al-Al2Cu eutectics is greatly influenced by the loading orientation, with different mechanisms observed for parallel, inclined, and normal loading. Decreasing inter-lamellar spacing led to increased strength and more uniform plasticity distribution, with the highest compressive plasticity observed in polycrystalline eutectics with an average spacing of 20 nm.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Chengjuan Wang, Yanxiang Wang, Haotian Jiang, Hongxue Tan, Dongming Liu
Summary: The continuous preparation of carbon nanotubes/carbon fiber (CNTs/CF) multiscale reinforcements and microwave absorbers using one-step chemical vapor deposition (CVD) at different temperatures shows excellent mechanical and electromagnetic wave absorption properties. CNTs/CF650 and CNTs/CF700 exhibit high-performance EMW absorption abilities with wide effective absorption bands at ultrathin thickness, attributing to the synergistic effects of multiple heterointerfaces, defects, electronic conductivity, and impedance matching.
Article
Chemistry, Physical
Jhih H. Liang, Zac Milne, Mehdi Rouhani, Yi-Pan Lin, Rodrigo A. Bernal, Takaaki Sato, Robert W. Carpick, Yeau R. Jeng
Summary: This study presents the first in situ transmission electron microscope (TEM) investigation of diamond-like carbon (DLC) sliding on diamond. The tribological properties of amorphous carbon (a-C) are explored under the harsh condition of sliding against diamond in a vacuum. Real-time TEM imaging provides insights into wear mechanisms and damage. The study reveals that high contact stresses lead to increased adhesion and accelerated wear of a-C on diamond.
Article
Construction & Building Technology
Jing Tian, Xinghong Jiang, Xinan Yang, Mingjie Ma, Luheng Li
Summary: This paper investigates the bonding properties of the UHPC-NC grooved interface through experimental tests. The results show that the bonding strength of the interface is influenced by the NC strength and groove density. Based on the experimental results, a calculation formula for the cohesion of the UHPC-NC slot interface is established, providing reference for the design and construction of tunnel reinforcement structures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Physics, Applied
Jiaming Liu, Jiaqi Zhang, Toyoko Arai, Masahiko Tomitori, Yoshifumi Oshima
Summary: By estimating the critical shear stress (CSS) of gold nanocontacts using an in situ transmission electron microscopy holder equipped with a quartz length-extension resonator (LER) as a force sensor, the value of CSS was determined to be 0.94 GPa. Reproducing the dissipation by applying this CSS value to a simple slip model with a hysteretic force-displacement curve suggests the potential for elucidating the plastic deformation mechanism.
APPLIED PHYSICS EXPRESS
(2021)
Article
Engineering, Environmental
Hamed Behzadipour, Abouzar Sadrekarimi
Summary: Microbially induced calcite precipitation (MICP) driven by native microorganisms in soil was explored in this study, comparing the roles of yeast extract, molasses, and biochar in stimulating these microorganisms with bioaugmentation. Results showed that biochar-assisted microbial treatment led to increased strength and reduced permeability in sand specimens, with potential applications in stabilizing slopes against wave-induced erosion.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Soil Science
Shaurav Alam, Tanvir Manzur, Eric Borquist, Joseph Williams, Cody Rogers, David Hall, William B. Patterson, Joseph Higuera, Erik Eklund, Jay Wang, John Matthews
Summary: Research suggests that seawalls can control coastal soil erosion, but they can also cause water clarity deterioration and algae growth. Using controlled cultivation of plants as an environmentally friendly solution may be more effective, as plant root tensile strength directly impacts soil shear strength. The In-situ Smart Testing Apparatus (ISTA) developed in this study has the potential to measure, store, and distribute real-time data to aid professionals in preventing soil erosion and ensuring sustainable coastal ecosystems.
SOIL & TILLAGE RESEARCH
(2021)
Article
Mechanics
Ke Yuan, Kai Liu, Minquan Zhao, Kai Wei, Zhonggang Wang
Summary: The in situ effect on cross-ply laminates under out-of-plane shear loading is studied using a two-dimensional RVE-based computational micromechanics method. High fidelity simulations of interface debonding and crack propagation in laminates show good consistency with experimental observation. Thinner ply laminates demonstrate higher shear strength and stronger damage resistance due to the delay effect of transverse cracking and delamination. The findings provide insights into the failure mechanism and optimization design of multi-layer composites.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Chemical
Xuejie Zhang, Wei Wang, Xiaojun Liu, Kun Liu
Summary: The sliding state of particle contacts has a significant impact on the macroscopic rheological behaviors of granular systems. This study partitions the whole contact network into sliding and nonsliding subnetworks and investigates their microstructure characteristics, anisotropies, and contributions. The sliding subnetwork reduces the stability of the system. The anisotropic parameters of the subnetworks contribute positively to the shear strength, except for the anisotropy in the normal contact force of the sliding subnetwork. The nonsliding subnetwork consistently makes a greater contribution to the shear strength, but its contribution weight decreases with increasing flow rate. The difference and complementarity in stability between subnetworks maintain a dynamic balance between collapse and reconstruction of the entire network.
Article
Construction & Building Technology
Ryan T. Stevens, Ryan J. Sherman, Matthew H. Hebdon
Summary: The research aims to estimate the shear strength of rivets by testing their surface hardness, proposing a direct correlation between hardness and shear strength, and finding that it is not appropriate to estimate the hardness of all rivets based on a small subset of tested rivets.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yingzong Liu, Yujie Bai, Jintao Chen, Hui Chen, Zongtao Zhu, Yuanxing Li
Summary: Magnesium and aluminum alloys are widely used in various industries due to their light weight and other properties. However, the formation of Mg-Al intermetallic compounds (IMCs) reduces the joint properties, limiting their applications. This study successfully controls the IMC thickness and improves joint strength through ultrasonic-assisted soldering with different cooling rates, providing a feasible method for controlling IMCs in dissimilar metal joining.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Chengqian Wang, Keyu Luo, Peng He, Hongzhi Zhou, Rongqing Li, Zhihao Zhang, Daquan Yu, Shuye Zhang
Summary: In this study, the blocking effect of electroplated Ni was investigated using EBSD to inhibit the growth of IMC layers in high density packaging technology. The diffusion of interfacial elements was found to be the main cause of compound growth after high temperature storage. The grain orientation tended to be consistent and the grain size increased with time. The blocking effect of Ni was calculated from the atomic diffusion level. Moreover, the mechanical properties showed an increasing and then decreasing trend over time. Three fracture modes were observed in nanopush ball experiments, with the fracture type shifting as the IMC thickness increased and Cu6Sn5 was generated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Geological
Yanhao Zheng, Matthew Richard Coop, Huiming Tang, Zhiqiang Fan
Summary: This study conducted a series of laboratory ring shear tests on the Huangtupo landslide in the Three Gorges Reservoir Region (TGRR) to investigate the effect of overconsolidation on the reactivated residual strength of deep-seated sliding zone soil. The results provide a reliable scientific basis for improving stability analysis and reinforcement measures for slow-moving landslides in the TGRR and can be applied to similar slow-moving landslides in other areas.
ENGINEERING GEOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Roman Anufriev, Daisuke Ohori, Yunhui Wu, Ryoto Yanagisawa, Laurent Jalabert, Seiji Samukawa, Masahiro Nomura
Summary: The high thermal conductivity of silicon limits the performance of silicon-based thermoelectric energy generators. Past theoretical works proposed reducing the thermal conductivity with nanopillars on silicon films. However, due to difficulties in nanofabrication and measurements, these predictions were never confirmed. In this work, we fabricated and measured silicon films with nanopillars as small as 12 nm in diameter. Our experiments showed that nanopillars do host resonant phonon modes, but thermal measurements revealed no significant difference compared to silicon membranes without nanopillars. These results contradict previous predictions, suggesting the need for refined simulations under realistic experimental conditions.
Article
Materials Science, Multidisciplinary
Tianhui Zhu, Yunhui Wu, Shuai Li, Farjana F. Tonni, Masahiro Nomura, Mona Zebarjadi
Summary: Silicon thin films are promising for chip-integrated Peltier micro-coolers and thermoelectric power generators due to their compatibility and cost effectiveness. This study focuses on reducing thermal conductivity by creating patterned nano-holes in single crystalline silicon thin films and surface doping them with organic molecules F4TCNQ. The results show significant improvements in electrical conductivity and power factor.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Applied
Dhanishtha Singh, Roman Anufriev, Masahiro Nomura
Summary: Manipulating heat flux at the nanoscale is crucial in modern microelectronics, but it often requires complex nanofabrication techniques. This study proposes simple designs using parabolic mirrors for collimation and focusing of thermal phonons without the need for nanofabrication. Monte Carlo simulations demonstrate that parabolic surfaces can act as mirrors to collimate or focus phonon fluxes in semiconductors. These devices have the potential to revolutionize the thermal management of low-temperature systems, such as quantum circuits or cryogenic particle detectors.
APPLIED PHYSICS LETTERS
(2023)
Article
Thermodynamics
Jose Ordonez-Miranda, Maelie Coral, Masahiro Nomura, Sebastian Volz
Summary: The axial thermal conductance of a cylindrical cavity supporting the propagation of hybridized guided modes along its interface with SiO2 is quantified and analyzed. It is shown that the axial thermal conductance increases with the cavity radius up to 1 cm and increases with temperature. At 500 K, a maximum thermal conductance of 289.4 nW.K-1 is found, which is more than 3 orders of magnitude higher than the corresponding one found in the far-field regime. This top polariton thermal conductance along the cavity represents a fundamental heat transport channel driven by hybridized guided modes.
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2023)
Article
Physics, Applied
Jose Ordonez-Miranda, Laurent Jalabert, Yunhui Wu, Sebastian Volz, Masahiro Nomura
Summary: This article derives and analytically integrates models for the heater and sensor 3? signals of the temperature field of anisotropic bulk materials and thin films. The integration is done using the Fourier transform and expressing the frequency dependence of temperature in terms of the modified Bessel and Struve functions. The exact integrated models are expected to facilitate the accurate determination of the thermal conductivity and thermal diffusivity of anisotropic materials through a wide spectrum of modulation frequencies and without time-consuming numerical integration.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Xin Huang, Yangyu Guo, Yunhui Wu, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Zhongwei Zhang, Sebastian Volz, Tomoki Machida, Masahiro Nomura
Summary: This study experimentally confirms the existence of phonon Poiseuille flow in graphitic systems, providing important insights into phonon hydrodynamics and advances in heat manipulation applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xin Huang, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida, Masahiro Nomura
Summary: The temperature dependence of thermal conductivity in solids has been widely studied and considered as evidence for hydrodynamic phonon transport. However, the direct demonstration of hydrodynamic thermal conduction and its dependence on structure width remains unexplored. In this work, we experimentally measured thermal conductivity in graphite ribbon structures with different widths and observed enhanced width dependence in the hydrodynamic window. These findings provide important evidence for phonon hydrodynamic transport and can guide future efforts in heat dissipation for electronic devices.
Article
Physics, Applied
Jose Ordonez-Miranda, Yuriy A. Kosevich, Bong Jae Lee, Masahiro Nomura, Sebastian Volz
Summary: The thermal conductance and thermal conductivity of plasmons in metallic nanofilms deposited on a substrate were studied. The symmetric and antisymmetric spatial distribution modes of the magnetic field drive the plasmon energy transport along the film interfaces. The plasmon thermal conductance is higher for hotter and/or longer films, saturating for films thicker than 50 nm. The transition of plasmon modes maximizes the thermal conductivity for thinner films, and a 10 nm thick gold nanofilm at 300 K has a maximum thermal conductivity of 15 W m-1 K-1, about 25% of its electron counterpart. The plasmon thermal conductivity increases significantly with film length and temperature, potentially improving heat dissipation along metallic nanofilms.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Yajuan Cheng, Zheyong Fan, Tao Zhang, Masahiro Nomura, Sebastian Volz, Guimei Zhu, Baowen Li, Shiyun Xiong
Summary: We report a local minimum in thermal conductivity in twisted bilayer graphene (TBG) at the angle of 1.08 degrees, which corresponds to the 'magic angle' in the transition of several other reported properties. The thermal magic angle arises from the competition between the delocalization of atomic vibrational amplitudes and stresses on one hand, and the increased AA stacking density on the other hand. The manifestation of a magic angle, disclosing new thermal mechanisms at nanoscale, further uncovers the unique physics of two-dimensional materials.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Xin Wu, Xin Huang, Lei Yang, Zhongwei Zhang, Yangyu Guo, Sebastian Volz, Qiang Han, Masahiro Nomura
Summary: Inspired by mathematics, this study demonstrates efficient suppression of phonon thermal transport in a 2D heterosystem made of graphene and hexagonal boron nitride by using the Golomb ruler sequences. The Golomb ruler design cancels out coherent phonon transport, resulting in extreme suppression of thermal conductivity with minimal interfaces, without any defects or dopants. This work provides a new and efficient solution for suppressing thermal transport in 2D heterosystems, utilizing the mathematically inspired Golomb ruler design.
Article
Physics, Applied
Sota Koike, Ryoto Yanagisawa, Masashi Kurosawa, Rajveer Jha, Naohito Tsujii, Takao Mori, Masahiro Nomura
Summary: We experimentally investigated the effect of nanostructuring on the thermoelectric performance of SiGe thin films. Porous nanostructures were fabricated to reduce thermal conductivity and improve thermoelectric figure of merit. The results showed that the nanostructured SiGe thin films had a 24% lower thermal conductivity and a 19% lower electrical conductivity compared to films without nanostructure, resulting in a 4% increase in thermoelectric figure of merit at room temperature.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Byunggi Kim, Hodaka Kurokawa, Katsuta Sakai, Kazuki Koshino, Hideo Kosaka, Masahiro Nomura
Summary: This article presents an efficient quantum transduction scheme using a one-dimensional diamond optomechanical crystal cavity without optomechanical coupling. By manipulating the energy level of a coherent color-center electron and the strong mechanical-mode-color-center electron-coupling rate, high conversion efficiency quantum transduction is achieved. The results imply that this system offers a highly efficient platform for quantum transduction.
PHYSICAL REVIEW APPLIED
(2023)
Article
Multidisciplinary Sciences
Jean Cacheux, Jose Ordonez-Miranda, Aurelien Bancaud, Laurent Jalabert, Daniel Alcaide, Masahiro Nomura, Yukiko T. Matsunaga
Summary: The Starling principle explains the exchange between blood and tissues based on hydrostatic and osmotic flows. However, the effect of blood pressure on the permeability of collagen, the main component of tissues, remains poorly understood. In this study, an instrument was developed to measure the elasticity and permeability of collagen gels under tension and compression. The results showed a decrease in permeability and increased strain stiffening of native collagen gels under compression compared to tension, and these effects were diminished after chemical cross-linking. Additionally, the permeability of native collagen gels could be controlled using sinusoidal fluid injection, which was attributed to the asymmetric response to tension and compression. The findings suggest that blood-associated pulsations may contribute to tissue exchanges.
Article
Materials Science, Multidisciplinary
Yangyu Guo, Xiao-Ping Luo, Zhongwei Zhang, Samy Merabia, Masahiro Nomura, Sebastian Volz
Summary: The phonon hydrodynamic regime in graphite films has been experimentally studied, but understanding and modeling of heat transport along the basal plane is still unclear. We predict that surface roughness significantly affects basal-plane thermal conductivity due to collective phonon drift. The occurrence of the phonon Knudsen minimum also depends strongly on surface roughness. We summarize basal-plane heat transport into coherent and incoherent regimes and speculate on the observed thickness-dependent thermal conductivity. Our work provides guidance for future experimental explorations of phonon hydrodynamics in graphitic micro- and nanostructures.
Article
Materials Science, Multidisciplinary
Zhongwei Zhang, Yangyu Guo, Marc Bescond, Masahiro Nomura, Sebastian Volz, Jie Chen
Summary: In this paper, a theoretical model for exploring phonon coherence based on spectroscopy is proposed and validated using Brillouin light scattering data and molecular dynamic simulations. The model shows that confined modes exhibit wavelike behavior with a higher ratio of coherence time to lifetime. The spectroscopy data also demonstrates the dependence of phonon coherence on system size. The proposed model allows for reassessing conventional spectroscopy data to obtain coherence times, which are crucial for understanding and estimating phonon characteristics and heat transport in solids.
