A5024764078- Electromagnetic wave absorption materials
- Advanced Antenna and Metasurface Technologies
- Dielectric materials and actuators
- Advanced Sensor and Energy Harvesting Materials
- Thermal properties of materials
- Carbon Nanotubes in Composites
- Graphene research and applications
- Polymer Foaming and Composites
- High Temperature Alloys and Creep
- MXene and MAX Phase Materials
- Microstructure and Mechanical Properties of Steels
- Fatigue and fracture mechanics
- Metamaterials and Metasurfaces Applications
- Conducting polymers and applications
- Natural Fiber Reinforced Composites
- Antenna Design and Analysis
- Welding Techniques and Residual Stresses
- 2D Materials and Applications
- Composite Structure Analysis and Optimization
- Mechanical Behavior of Composites
- Structural Analysis and Optimization
- Advanced Welding Techniques Analysis
- Force Microscopy Techniques and Applications
- Electromagnetic Compatibility and Measurements
- Gas Sensing Nanomaterials and Sensors
University of Alberta
2022-2024
University of Cambridge
2022-2024
University of Toronto
2017-2022
University of California, Berkeley
2021-2022
Toronto Metropolitan University
2014-2015
Islamic Azad University, Tehran
2011-2012
In this study, we fabricated conductive poly(vinylidene fluoride) (PVDF)/carbon composites simply by dispersing multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets into a PVDF solution. The electrical conductivity the electromagnetic interference (EMI) shielding of PVDF/carbon were increased increasing filler amounts. Moreover, also found that EMI properties PVDF/CNT/graphene higher than those PVDF/CNT PVDF/graphene composites. mean values PVDF/5 wt %-CNT, PVDF/10 %-graphene,...
In recent decades, problems with electromagnetic interference (EMI) radiation have arisen, that can seriously reduce the performance of precision devices nearby and threaten human health.
The electrical conductivity and the EMI shielding properties could be effectively tuned by foaming degree.
Lightweight high-density polyethylene (HDPE)–graphene nanoplatelet (GnP) composite foams were fabricated via a supercritical-fluid (SCF) treatment and physical foaming in an injection-molding process. We demonstrated that the introduction of microcellular structure can substantially increase electrical conductivity decrease percolation threshold polymer–GnP composites. The nanocomposite had significantly higher conductivity, dielectric constant, electromagnetic interference (EMI) shielding...
Lightweight, high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for addressing the challenge of ever-increasing pollution. Lightweight layered foam/film PVDF nanocomposites with efficient EMI effectiveness ultralow power were fabricated by physical foaming. The unique structure was composed PVDF/SiCnw/MXene (Ti3C2Tx) composite foam as absorption layer highly conductive PVDF/MWCNT/GnPs film a layer. numerous heterogeneous...
2D materials are well-known for their low-friction behavior by modifying the interfacial forces at atomic surfaces. Of wide range of materials, MXenes represent an emerging material class but lubricating has been scarcely investigated. Herein, friction mechanisms Ti3C2Tx demonstrated which attributed to surface terminations. We find that do not exhibit frictional layer dependence other materials. Instead, nanoscale lubricity is governed termination species resulting from synthesis. Annealing...
PVDF nanocomposite foams with ultra-low MWCNT content exhibit high-efficiency microwave absorption properties a light weight, strong and wide-band absorption, small-thickness properties.
A microcellular structure can effectively tune the dielectric properties of PVDF/carbon composite foams.
As electronic devices become increasingly miniaturized, their thermal management becomes critical. Efficient heat dissipation guarantees optimal performance and service life. Graphene nanoplatelets (GnPs) have excellent properties that show promise for use in fabricating commercial polymer nanocomposites with high conductivity. Herein, an industrially viable technique manufacturing a new class of lightweight GnP-polymer conductivity is presented. Using this method, GnP-high-density...
Dielectric polymer nanocomposites with high dielectric constant (ε′) and low loss (tan δ) are extremely desirable in the electronics industry. Percolative polymer–graphene nanoplatelet (GnP) composites have shown great promise as materials for high-performance capacitors. Herein, an industrially-viable technique manufacturing a new class of ultralight composite foams using commercial GnPs excellent performance is presented. Using this method, high-density polyethylene (HDPE)–GnPs...
Nowadays, evolutions in wireless telecommunication industries, such as the emergence of complex 5G technology, occur together with massive development portable electronics and systems. This positive progress has come at expense significant electromagnetic interference (EMI) pollution, which requires highly efficient shielding materials low EM reflection. The manipulation MXene surface functional groups and, subsequently, incorporation into engineered polymer matrices provide mechanisms to...
The development of layered polymer composites and foams offers a promising solution for achieving effective electromagnetic interference (EMI) shielding while minimizing secondary pollution. However, the current fabrication process is largely based on trial error, with limited focus optimizing geometry microstructure. This often results in suboptimal wave reflection use unnecessarily thick samples. In this study, an input impedance model was employed to guide PVDF composite foams. approach...
Abstract Electromagnetic pollution presents growing challenges due to the rapid expansion of portable electronic and communication systems, necessitating lightweight materials with superior shielding capabilities. While prior studies focused on enhancing electromagnetic interference (EMI) effectiveness (SE), less attention is given absorption‐dominant mechanisms, which mitigate secondary pollution. By leveraging material science engineering design, a layered structure developed comprising...
While elastic properties of nanoconfined polymer films have been recognized to show departures from bulk behavior, a careful understanding the origins mechanical size effects remains weak. Here, we report significant stiffening freestanding ultrathin poly(methyl methacrylate) varying thicknesses (6–200 nm) through atomic force microscopy deflection measurements at ambient conditions. After excluding substrate influence, mechanism is linked extended chain conformations based on small-angle...
Geometric factors of nanofillers considerably govern the properties conductive polymer composites (CPCs). This study provides insights into how geometrical alteration through nanotube-to-nanoribbon conversion affects electrical solid and microcellular CPCs. In this regard, polyvinylidene fluoride (PVDF)-based nanocomposites are synthesized using both parent multi-walled carbon nanotube (MWCNT) its chemically unzipped product, i.e., graphene nanoribbons (GNRs). Theoretical experimental...