The Experts below are selected from a list of 177 Experts worldwide ranked by ideXlab platform
Wancheng Zhou - One of the best experts on this subject based on the ideXlab platform.
-
Electromagnetic Property of sio2 coated carbonyl iron polyimide composites as heat resistant microwave absorbing materials
Journal of Magnetism and Magnetic Materials, 2015Co-Authors: H P Wang, Wancheng ZhouAbstract:Abstract Heat resistant microwave absorbing materials were prepared by compression molding method, using polyimide resin as matrix and SiO2 coated carbonyl iron (CI) as filler. The SiO2 coated CI particles were prepared by Stober process. The microwave absorbing properties and the effect of heat treatment on the Electromagnetic properties of SiO2 coated CI/polyimide composites were investigated. When the content of SiO2 coated CI is 60 wt%, the value of minimum reflection loss decreases from −25 dB to −33 dB with the thickness increases from 1.5 mm to 2.1 mm. According to the thermal-gravimetric analyses (TGA) curves, the polyimide matrix can be used at 300 °C for long time. The complex permittivity of the composites slightly increases while the complex permeability almost keeps constant after heat treatment at 300 °C for 10 h, which indicating that the composites can be used at elevated temperature as microwave absorbing materials at the same time have good heat resistance and microwave absorption.
Jie Yuan - One of the best experts on this subject based on the ideXlab platform.
-
2D MXenes: Electromagnetic Property for microwave absorption and Electromagnetic interference shielding
Chemical Engineering Journal, 2019Co-Authors: Mao Sheng Cao, Yong Zhu Cai, Jin Cheng Shu, Wen Qiang Cao, Peng He, Jie YuanAbstract:MXene, a shining star of two-dimensional (2D) materials, perfectly showcases layered structure, outstanding electrical conductivity, tunable active surface, and excellent mechanical strength, all of which make it extremely attractive in various applications, in particular for the ever growing market of microwave absorption (MA) and Electromagnetic interference (EMI) shielding technology. Herein, we introduce the synthetic strategies, structure and properties of MXene-based materials. The current research progresses on the dielectric properties of MXene are comprehensively summarized and analyzed. We objectively overview and evaluate the state-of-the-art in Electromagnetic wave absorbing and shielding of MXene-based matrials and dissect the major problems and bottlenecks. In addition, prospective research opportunities are highlighted toward the development of advanced MXene-based materials for MA and EMI shielding.
-
Electromagnetic Property and tunable microwave absorption of 3d nets from nickel chains at elevated temperature
ACS Applied Materials & Interfaces, 2016Co-Authors: Wenzhong Wang, Jie YuanAbstract:We fabricated the nickel chains by a facile wet chemical method. The morphology of nickel chains were tailored by adjusting the amount of PVP during the synthesis process. Both the complex permittivity and permeability of the three-dimensional (3D) nets constructed by nickel chains present strong dependences on temperature in the frequency range of 8.2–12.4 GHz and temperature range of 323–573 K. The peaks in imaginary component of permittivity and permeability mainly derive from interfacial polarizations and resonances, devoting to dielectric and magnetic loss, respectively. The effect from both dielectric and magnetism contribute to enhancing the microwave absorption. The maximum absorption value of the 3D nickel chain nets is approximately −50 dB at 8.8 GHz and 373 K with a thickness of 1.8 mm, and the bandwidth less than −10 dB almost covers the whole investigated frequency band. These are encouraging findings, which provide the potential advantages of magnetic transition metal-based materials for mic...
H P Wang - One of the best experts on this subject based on the ideXlab platform.
-
Electromagnetic Property of sio2 coated carbonyl iron polyimide composites as heat resistant microwave absorbing materials
Journal of Magnetism and Magnetic Materials, 2015Co-Authors: H P Wang, Wancheng ZhouAbstract:Abstract Heat resistant microwave absorbing materials were prepared by compression molding method, using polyimide resin as matrix and SiO2 coated carbonyl iron (CI) as filler. The SiO2 coated CI particles were prepared by Stober process. The microwave absorbing properties and the effect of heat treatment on the Electromagnetic properties of SiO2 coated CI/polyimide composites were investigated. When the content of SiO2 coated CI is 60 wt%, the value of minimum reflection loss decreases from −25 dB to −33 dB with the thickness increases from 1.5 mm to 2.1 mm. According to the thermal-gravimetric analyses (TGA) curves, the polyimide matrix can be used at 300 °C for long time. The complex permittivity of the composites slightly increases while the complex permeability almost keeps constant after heat treatment at 300 °C for 10 h, which indicating that the composites can be used at elevated temperature as microwave absorbing materials at the same time have good heat resistance and microwave absorption.
Huijing Yang - One of the best experts on this subject based on the ideXlab platform.
-
tailoring mof based materials to tune Electromagnetic Property for great microwave absorbers and devices
Carbon, 2020Co-Authors: Xinyu Yang, Xinran Zhang, Xiaoyuan Huang, Lin Li, Huijing YangAbstract:Abstract Metal-organic framework (MOF) materials have highly sought after in Electromagnetic materials and functional devices, due to the unique three-dimensional structure and electronic state. Herein, the tailoring strategy of MOF materials, including MOF precursors and carbonized derivatives, is combed for high-efficiency microwave absorbers. The design idea from microstructure to Electromagnetic response is constructed. Based on these theories, the current research progress about MOF-based absorbers is presented, and the effect of microstructure tailoring to Electromagnetic Property and microwave absorption is revealed. In addition, the application of MOF materials in functional device is outlined. Finally, the current challenges for MOF materials and devices are overviewed, and the future development is expected.
Yonggang Xu - One of the best experts on this subject based on the ideXlab platform.
-
Electromagnetic Property of a novel gradient honeycomb composite fabricated by 3d forming
Journal of Magnetism and Magnetic Materials, 2020Co-Authors: Yonggang Xu, Donglin SuAbstract:Abstract In order to get the wide band absorbing and shielding composite, a novel gradient honeycomb absorber was designed as the polyethylene terephthalate glycol (PETG) was matrix and carbonyl iron particles (CIPs) and flaky Cu were the absorbents. The composite was fabricated by 3D printing and the morphology was obtained by the scanning electron microscopy. The permittivity and permeability of the absorbing wire were tested with the vector network analyzer. Using the transmission and reflection method, the parameters of the columnar and gradient honeycomb elements were simulated. The equivalent parameters were calculated based on the Maxwell-Garnett mixing rule, then the simulated and calculated results including reflection loss (RL) and shielding effectiveness (SE) were compared, the mixing rule was effective to calculate the equivalent parameters and the shape factor was the key parameter. Using the interpolate method on the shape factor, the permittivity and permeability of honeycomb with random size could be calculated. Finally, RL and SE were optimized using the genetic algorithm in which the structure lengths were the variables. The result indicated that the structural composites had an excellent absorbing Property (minimum RL −28 dB) in 8–12 GHz and SE was larger than 20 dB. As the incident wave was oblique, the absorbing Property was also excellent (minimum RL −35 dB@35°), the angle range was 0–70° with RL less than −10 dB. It could be implied that the novel gradient honeycomb was a potential good absorbing structure.
-
A chiral microwave absorbing absorbent of Fe-CoNiP coated on spirulina
Materials Chemistry and Physics, 2015Co-Authors: Yonggang Xu, Liming Yuan, Deyuan ZhangAbstract:A chiral bio-absorbent of Fe-CoNiP coated on the spirulina was fabricated by the electroless and chemical vapor decomposition. The scanning electron microscopy (SEM) was used to evaluate the spirulina cells particle morphology. X-ray diffraction (XRD) patterns were done to analyze the particle crystal grain structure. The permittivity and permeability was measured by a vector network analyzer in frequency 8-18 GHz, and the reflection loss (RL) was calculated. The results showed the carbonyl iron particles (CIPs) and CoNiP were bonded to the spirulina surface, the permittivity and permeability could be enlarged as Fe films coated on the particles compared with the CoNiP spirulina, it was attributed to the excellent Electromagnetic Property of CIPs. The chiral Fe-CoNiP composites had a better absorbing Property at 8-18 GHz than the CoNiP spirulina composite, the RL was -16.26 dB at 10.48 GHz, the absorbing band was 9.5-11.5 GHz of RL less than -10 dB, which indicated the Fe-CoNiP spirulina could be an effective absorbent used in 8-18 GHz.