A5079870574- Advanced Sensor and Energy Harvesting Materials
- Advanced Materials and Mechanics
- Gyrotron and Vacuum Electronics Research
- Graphene research and applications
- Microwave Engineering and Waveguides
- Particle accelerators and beam dynamics
- Carbon Nanotubes in Composites
- Semiconductor Lasers and Optical Devices
- Advanced Thermodynamic Systems and Engines
- Spacecraft and Cryogenic Technologies
- Thermal properties of materials
- Structural Analysis and Optimization
- Diatoms and Algae Research
- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Metamaterials and Metasurfaces Applications
- Radiation Effects in Electronics
- Advancements in Battery Materials
- Terahertz technology and applications
- Antenna Design and Analysis
- Spectroscopy and Laser Applications
- Nonlocal and gradient elasticity in micro/nano structures
- Advanced Antenna and Metasurface Technologies
- Refrigeration and Air Conditioning Technologies
- Structural Engineering and Vibration Analysis
McGill University
2021-2025
Harbin Medical University
2024
First Affiliated Hospital of Harbin Medical University
2024
Beijing Vaccum Electronic Research Institute
2019-2021
University of Manitoba
2007-2017
North China Electric Power University
2015-2016
Jiangsu University of Science and Technology
2015
Beihang University
2014
University of Hong Kong
1998-2002
Hong Kong University of Science and Technology
1998-2002
The advent of conductive self‐healing (CSH) hydrogels, a class novel materials mimicking human skin, may change the trajectory industrial process because their potential applications in soft robots, biomimetic prostheses, and health‐monitoring systems. Here, development mechanically electrically hydrogel based on physically chemically cross‐linked networks is reported. autonomous intrinsic attained through dynamic ionic interactions between carboxylic groups poly(acrylic acid) ferric ions. A...
Origami engineering stands out as one of the prominent approaches for fine tuning multiphysical properties energy materials. Employing first-principle calculations at nanoscale, we explore mechano-thermoelectric graphene origami metamaterials functionalized by hydrogen (H), nitrogen (N), oxygen (O), and fluorine (F) adatoms. Our computational results reveal that functionalizing carbon (C) atoms induce buckling in pristine graphene, transitioning from sp2 (for sheet) to hybridized sp3 orbital...
The pursuit of efficient energy harvesting technologies at the nanoscale has prompted a thorough exploration piezoelectric nanogenerators. This study investigates properties (e.g., stress and strain constants, dielectric constant, piezopotential coefficient) nano-architected gallium nitride (GaN) metamaterials through molecular dynamics simulation. Constructing twelve different topologies from three architecture families (i.e., cubic, octahedron, triply periodic minimal surface), research...
Pyroelectric materials exhibit spontaneous polarization in response to temperature fluctuations, a phenomenon known as the pyroelectric effect. This study investigates properties of nanoarchitected gallium nitride (GaN) metamaterials with distinctive topologies, i.e., body-centered cube, octet truss, gyroid, and spinodoid, using molecular dynamics simulations. Our findings reveal topology-dependent enhancement coefficient, primarily affected by piezoelectric stress constant thermal expansion...
Tuning and programming the multiphysical properties of advanced materials are critical importance for developing next generation adaptable multifunctional metamaterials. This study demonstrates tunability thermo-mechanical graphene sheets carbon nanotubes by inspiring from hierarchical kirigami mechanical The theoretical investigation, multiscale simulation, experimentation show that nano-architected metamaterials can be tuned altering geometrical parameters introducing cutting patterns....
Elastocaloric materials, capable of achieving reversible thermal changes in response to a uniaxial stress, have attracted considerable attention for applications advanced management technologies, owing their environmental friendliness and economic benefits. However, most elastocaloric materials operating on the basis first/second-order phase transition often exhibit limited caloric response, field hysteresis, restricted working temperature ranges. This study resorts origami engineering...
The significant effect of the strut angle on mechanical properties strut‐based lattice structures is systematically explored through experimental and numerical investigations. highest values elastic modulus yield strength, surpassing those observed in cubic lattices with same relative density, have been experimentally at 71.76°. A correlation among modulus, angles lattices, validated by tests, has identified developing a theoretical modelling conducting detailed finite element analysis....
Diatoms have delicate porous structures which are very beneficial in improving the absorbing ability bio-detection field. In this study, multi-layered hierarchical arrays were fabricated by packing Nitzschia soratensis (N. soratensis) frustules into Cosinodiscus argus (C. argus) to achieve advanced sensitivity chips. Photolithographic patterning was used obtain N. frustule arrays, and floating behavior of C. employed control their postures for array spots. The morphology multi-layer argus–N....
Nanoarchitected Materials In article number 2200039, Abdolhamid Akbarzadeh and co-workers present a perspective on devising the next generation of carbon-based nanoarchitected metamaterials through inspiration from biological design motifs. demonstrate promising instances for filling empty regions in material property charts to realize lightweight multifunctional advanced materials that may also break trade-off between stiffness/strength failure strain/toughness.
Diatom, with delicate three-dimensional porous structures and texture, has a promising application in micro-nanotechnology especially biosensing. In order to achieve diatom-based compound substrate, fabrication technique is developed for hydrofluoric acid (HF) bonding of diatom SiO2-based substrate at temperature as low 80 °C. The conditions are optimized various HF concentrations applied pressure. concentration found be the range 0.8% 1.2% pressure from 0.4.0 MPa 0.6.0 MPa. morphological...
Bioinspired materials often achieve superior mechanical properties owing to their microscale architectures that resemble design motifs in biological materials. The bioinspired can be extended nanoscale, where carbon‐based materials, including graphene and carbon nanotubes, are excellent candidates as building blocks. This study introduces nanoarchitected metamaterials inspired by seven motifs, i.e., cellular, gradient, tubular, fibrous, helicoidal, suture, layered structures. Numerical...
Abstract Finite element method (FEM) is considered as a powerful tool for predicting the mechanical behavior of complex structures. However, commercially available numerical packages based on FEM are mainly limited to evaluation multiphysical properties at continuum scale and unable accurately evaluate response nanomaterials since dominant surface effects in nanoscale analysis overlooked. In this study, our introduced methodology not only incorporates residual stress tensile stiffness...
In the past years, we have fabricated a number of diamond windows for TWTs ranging from W-band to 340 GHz. This paper describes recent progress in research and development TWT window at Beijing Vacuum Electronics Research Institute (BVERI).
The mechanical properties of low-stress cantilevered Nd2Fe14B/Ta multilayered microstructures are characterized. fabricated using silicon molding technique and XeF2 gas-phase etching process. magnetic microcantilevers show relatively high quality factors varying from 75 to 135. Young's modulus the film is evaluated by fitting resonance response microcantilevers, which smaller than those bulk Nd2Fe14B magnets due texture effect. good indicate that films can be used as a structural material...
In this paper, new single- and double-gate race-track-shaped field emitter structures are reported for the first time. The edge emission is used to provide good uniformity large current density, control small turn-on voltage. Experimental results show that voltage of single-gate structure approximately 100 V, density 2.4 A/cm/sup 2/ which over 12 times larger than volcano-shaped previously. Furthermore, numerical simulations reduced by 30% compared structure.