Article
Chemistry, Physical
Jiandong Wu, Yang Feng, Ying Xia, Qing Zhu, Liping Luo, Lan Ma, Haiming Li, Hongxia Yan, Shuhua Qi
Summary: By loading highly defective TiO2 onto an MXene sheet with S-doping and high-temperature annealing treatment, the impedance-matching properties were optimized, enhancing the electromagnetic wave absorption effect and improving the performance of MXene EMW absorbers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yue Yuan, Shicheng Wei, Yi Liang, Bo Wang, Yujiang Wang, Wei Xin, Xinlei Wang, Yu Zhang
Summary: The cobalt ferrite/carbon nanotubes nanocomposite absorber materials synthesized by a solvothermal method demonstrate excellent absorption properties and a wide absorption bandwidth, making them suitable for microwave absorbers in various technological applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Jimei Xue, Song Hu, Xiaoping Li, Fei Li, Yuqiang Liu, Hanjun Wei
Summary: This study investigates the enhancement of microwave absorption performance in SiCN ceramics by introducing Y2O3. By forming Y2O3-SiCN heterogeneous amorphous interfaces, defects, and dipole polarization, a multiple polarization loss mechanism is achieved, resulting in excellent microwave absorption performance in SiCN-Y2O3 ceramics over a wide thickness range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Polymer Science
Aibo Zhang, Dong Wang, Yiru Li, Wen Zheng, Qunzheng Zhang, Jie Kong
Summary: Bowl-shaped PS microspheres were synthesized and utilized with MWCNTs to construct absorber hybrids, showing excellent absorbing performance. The presence of bowl cavity structure is crucial for energy attenuation of incident electromagnetic waves, enhancing impedance matching, electromagnetic wave transmission path, and multiple reflections within absorbing materials.
JOURNAL OF POLYMER RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Fahad H. Falqi, Osamah A. Bin-Dahman, Ahmed Khair, Mamdouh A. Al-Harthi
Summary: This study developed nanocomposites with different amounts of graphene in low-cost PVA/PEG materials and investigated their shape-memory performance under various actuation methods. The nanocomposite containing 0.2 wt% graphene exhibited the best shape-memory performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Polymer Science
Hamdy F. M. Mohamed, Esam E. Abdel-Hady, Mostafa M. Y. Abdel-Moneim, Mohamed A. M. Bakr, Mohamed A. M. Soliman, Mahmoud G. H. Shehata, Mahmoud A. T. Ismail
Summary: Polymer electrolyte membrane (PEM) fuel cells have the potential to reduce energy consumption, pollutant emissions, and dependence on fossil fuels. This study synthesized cross-linked poly(vinyl) alcohol (PVA)/poly(ethylene) glycol (PEG) membranes with varying alumina (Al2O3) content and characterized them using various techniques. The results showed that the 0.7 wt.% Al2O3 membranes exhibited the lowest crystallinity and the highest proton conductivity, making them suitable as PEMs with high proton conductivity for fuel cell applications.
Article
Chemistry, Physical
Yiming Zhao, Yimeng Shan, Guoliang Ji, Yungang Sun, Weibin Shi, Minghang Li
Summary: Honeycomb sandwich structures (HSSs) using SiO2 fiber-reinforced epoxy resin composites were designed to improve impedance matching and enhance microwave absorption. The interface effect between the materials was discussed theoretically, experimentally, and numerically, revealing a 1-4% contribution from the interface to microwave absorption.
Article
Chemistry, Physical
Min Zhang, Chao Ma, Hongmei Liu, Qiangchun Liu
Summary: Multiferroic Y-type hexaferrite, spinel ferrite, and carbon nanotube ternary composites were successfully fabricated, with their properties such as magnetic and microwave absorption performances greatly influenced by the mass ratio of BMFO to NZFO phases. Adjusting the ratio can lead to different performance results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Rong Ji, Min Yang, Jingqing Lv, Zihan Wang, Yi Shi, Xiaoli Song, An Xie, Junliang Liu, Ming Zhang
Summary: Surface carboxylation of barium hexaferrite (BaM) provides activated points for the preferential growth of polyaniline (PANI) on BaM particles, leading to tuned morphology and improved complex permittivity. The convex rods and dendrite-like morphology of PANI activate electron transport, enhance interfacial polarization, and result in excellent microwave absorption due to enhanced electromagnetic wave dissipation and combination of losses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Xiaofeng Li, Gang Fang, Kangsen Peng, Guoyue Xu
Summary: SiO2/CNTs nano-composites were synthesized using the modified Stober method to explore their microwave absorbing performance at gradient temperatures. The results showed that the increase in temperature led to enhanced conductivity and a gradual increase in the real and imaginary parts of the complex permittivity, improving the attenuation. Ultimately, the sample tested at 400 degrees C demonstrated optimal microwave absorbing performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Peng Wu, Wenting He, Hongbo Guo
Summary: This study successfully synthesized a series of microwave absorption materials (MAMs) with thin thickness, high oxidation resistance, and tunable effective absorbing bandwidth. Among them, the equilibrium phase in the (La1-xSrx)FeO3/Al2O3 pseudo-binary composite exhibited the best electromagnetic wave absorption property, with RLmin= -38dB and an effective absorption bandwidth (EAB) of up to 2.78 GHz at a thickness of 1.5 mm. The tunable EAB ranged from 1 mm to 3 mm, reaching 13.22 GHz, indicating its superior performance as a MAM. The excellent microwave absorbing properties were attributed to the space charge polarization, dipole polarization, and conductive loss caused by heterogeneous interfaces, doping, and directional movement of charge carriers.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Chemical
S. Kunalan, Kalyan Dey, Projesh Kumar Roy, Vasumathi Velachi, Prabal Kumar Maiti, K. Palanivelu, N. Jayaraman
Summary: The development of polymer-dendrimer composite membranes with different generations of dendrimers showed promising results for efficient separation of CO2 gas. The third generation dendrimer-based composite membrane demonstrated optimal CO2 permeance and CO2/N2 selectivity, approaching the Robeson trade boundary curve. Experimental studies confirmed the superior performance and long-term stability of the membrane.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jinwen Hu, Sichen Liu, Yi Wang, Wenbo Ju, Na He, Jiayi He, Haoyang Jia, Chenbin Xia, Zhengsheng Huang, Jin Long, Xichun Zhong, Zhongwu Liu
Summary: In this study, flaky FeSiAl (FSA) powders were coated with an insulation layer by manganese phosphating treatment to improve the microwave absorption properties. The optimally Mn3(PO4)2 coated FSA showed excellent anti-corrosion performance with a much slower corrosion rate compared to the naked FSA particles. This work provides a low-cost phosphating process for manufacturing corrosion-resistant microwave absorbers in the widely-used X frequency band.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
Ashmeet Kaur Alang, Shankar G. Aggarwal, Khem Singh, Daya Soni, Prashant Hegde
Summary: This study investigates seasonal and diurnal patterns of ambient brown carbon (BrC) and its sources in Delhi, with a focus on the polarity and light absorption properties of BrC in PM2.5 samples. The results show that methanol extracts exhibit stronger light-absorbing ability, followed by water and hexane extracts. Biomass burning activities significantly contribute to BrC absorption and abundance in the ambient atmosphere. The optical properties of HULIS in post-monsoon and winter aerosols are also characterized, revealing different contributions from regional crop-residue burning and local emissions in the formation of HULIS.
ATMOSPHERIC RESEARCH
(2023)
Article
Multidisciplinary Sciences
Ting Zhou, Lei Wang, Xingye Huang, Junjuda Unruangsri, Hualei Zhang, Rong Wang, Qingliang Song, Qingyuan Yang, Weihua Li, Changchun Wang, Kaito Takahashi, Hangxun Xu, Jia Guo
Summary: Two-dimensional covalent organic frameworks have the potential to improve photocatalytic hydrogen evolution, but face stability issues during photocatalysis. This study demonstrates that enhancing layered stacking through a polymer-infiltration strategy can significantly boost photocatalytic performance.
NATURE COMMUNICATIONS
(2021)
