JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 31
·14313-14327
·
IF 3.5
An Boyuan,Zhang Dongjie,Liu Yuyan,Fan Zhimin,Tan Huifeng,Xie Zhimin
Ti 3 C 2 T x (MXene)-based composites are considered electromagnetic wave absorption (EMA) materials due to their dielectric properties, microstructure, and synergistic interactions with magnetic particles. A better understanding of the effect of the MXene content in composites on the EMA performance is essential for their application, yet it remains unclear. Here, MXene/PU@Fe 3 O 4 (MPF) microspheres with different MXene contents were produced through the incorporation of magnetic particles and multiple electrostatic self-assembly processes. The results show that when the molar ratio of MXene to Fe 3 O 4 is less than 0.5:1, the EMA performance of the MPF microspheres gradually increases with increasing MXene content. MPF microspheres exhibit the best EMA performance when the molar ratio of MXene to Fe 3 O 4 is 0.5:1, with a maximum reflection loss (RL) of 44.0 dB and an effective absorption bandwidth (EAB) of 2.30 GHz. Further increases in this ratio led to an increase in the EAB but a slight reduction in the maximum RL. Additionally, the combination of the same MXene and Fe 3 O 4 nanoparticle ratio had no significant effect on the EMA performance. We expect that this work will enrich the EMA performance research on MXene-based composites.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2019
·
IF 2.87
Xingliang Chen,Kailiang Zhong,Tao Shi,Xinlei Meng,Guanglei Wu,Yun Lu
Uniform urchin-like polyaniline/magnetic carbon sphere (PANI/p-C/NiFe 2 O 4 ) hybrid with superior electromagnetic wave absorption properties was successfully fabricated, and its morphologies and structures were investigated via SEM, XPS, XRD and FT-IR. Due to the fairly good matching of dielectric loss and magnetic loss, the PANI/p-C/NiFe 2 O 4 hybrid sample with thickness of 2.5 mm showed a minimum reflection loss value up to −37 dB in the frequency range of 2–18 GHz, the effective absorption band width of 3.9 GHz, and the excellent electromagnetic wave absorption property both in absorption efficiency and effective absorption band.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiang Luo,Haifeng Li,Dongdong Deng,Lu Zheng,Yubo Wu,Wenjun Luo,Meijie Zhang,Rongzhou Gong
Fe 3 O 4 , as a typical absorber, its electromagnetic wave (EMW) absorption properties are far from meeting the requirements of practical application due to its poor impedance matching. In this study, three kinds of novel heterogeneous structured composites, dendritic Fe 3 O 4 @(HCl doped PANI), Fe 3 O 4 @(p-TSA doped PANI) and Fe 3 O 4 @(dedoped PANI), were prepared via hydrothermal method combined with thermal reduction and in-situ polymerization, and their phase composition, microscopic morphologies, static magnetic properties , EMW absorption performance and absorption mechanisms were investigated. The results showed that the introduction of different medium doped and dedoped PANI greatly enhanced the EMW absorption performance of Fe 3 O 4 . The outstanding advantages of Fe 3 O 4 @(HCl doped PANI) were that the widest effective absorption bandwidth ( EAB ) up to 6.08 GHz in a relatively thin thickness of 2.1 mm. And the Fe 3 O 4 @(dedoped PANI) composite achieved strong absorption ability (− 53.08 dB@3.04 GHz) at low frequency in a relatively thin thickness (4.9 mm). The remarkable improvement of EMW absorption performance of dendritic Fe 3 O 4 @PANI composites could be attributed to the introduction of dissipation mechanisms, the optimization of impedance matching characteristics and the formation of appropriate conductive network microstructure. The dendritic Fe 3 O 4 @PANI composites are promising EMW absorption materials and have great practical application value.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 28
·7661-7670
·
IF 5.976
Yongzhao Hou,Bo Xiao,Guowei Yang,Zhiyuan Sun,Wen Yang,Songsong Wu,Xiaoxiao Huang,Guangwu Wen
Tunable electromagnetic properties and excellent thermo-stability are important criteria while choosing absorbers. Here, carbon-coated Fe3Si nanoparticles in amorphous SiCO ceramics (SiCO/C/Fe3Si) were successfully obtained via polymer-derived ceramics (PDC) from ferric acetylacetonate modified-polysilylacetylene (PSA). By adjusting the magnetic components, the structure of the absorbers could be tuned and their bandwidth varied. The absorbers with a hybrid composition (4.35 wt% Fe) possessed a minimal reflection loss (RL) of −32 dB at 9.2 GHz with a thickness of 3.5 mm and an effective bandwidth (RL < −10 dB) of about 3.6 GHz. The absorbers (12.33 wt% Fe) were enhanced and the minimal RL value was close to −41 dB at 7.9 GHz with a thickness of 3.5 mm. Simultaneously, a broad bandwidth (RL < −5 dB) appeared and covered nearly the whole S-band (2–3.95 GHz) where the RL value reached −10 dB at 2 GHz. After the second thermal treatment under 1000 °C, the minimal RL value of the absorbers (12.33 wt% Fe) remained at −33 dB at 6.6 GHz with a thickness of 4 mm, while the effective bandwidth was 3.4 GHz with a thickness of 3 mm. In addition, the formation mechanism of carbon-coated Fe3Si, which possibly resulted from the mesophase SiCFe alloy was also discussed. The as-prepared SiCO/C/Fe3Si hybrid exhibits outstanding wave absorption ability and present a huge potential for the application at high temperatures.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xue Guo,Junbin Lu,Jie Liu,Chunmiao Liu,Yanchun Tong,Jiao Li,Haibin Sun,Hui Peng,Shigang Wu,Yurun Feng,Hongyu Gong
By utilizing polymer-derived ceramics (PDCs) method and electrospinning technology, SiCN(Ni) fibers with 1 wt% nickel content at different calcination temperatures (1000–1300 °C) were synthesized. The properties of PDCs-SiCN(Ni) fibers were tested by XRD , SEM, TEM, Raman spectroscopy , XPS and vector network analyzer. The results showed that the addition of nickel acetylacetonate (NA) promoted the in-situ formation of CNTs and Ni 2 Si at high temperatures, which could adjust the impedance matching performance and improve the electromagnetic wave (EMW) absorption properties. The minimum reflection loss (RL) of SiCN(Ni) fibers was −47.55 dB (4.2 mm), and the effective absorption band (EAB, RL ≤ −10 dB) was 3.6 GHz (14.4–18 GHz) under the ultra-thin thickness of 1.24 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xiang Li,Lunzhou Yu,Zhen Xiang,Erbiao Cui,Juan Xiong,Xiao Wang,Wei Lu
Core-shell structure is an effective approach to modulate the impedance matching behaviour and induce polarization relaxation at the interface for the high-performance electromagnetic wave absorption (EMWA) materials. Herein, core-shell structures of Fe 3 O 4 –Fe@C (FFC) were successfully developed by hydrothermal and thermal decomposition methods. The results showed that the phase composition, microstructure and EMWA performance were tailored by the heat treatment process. The optimized FFC hybrid exhibited a minimum reflection loss ( RL ) value of −56.3 dB with a matching thickness of 1.99 mm, and the effective bandwidth ( RL < −10 dB, 5 GHz) covers almost the whole Ku band. The enhanced EMWA properties of the reinforced olive-like composites were mainly ascribed to the magnetic loss derived from the enhanced magnetic anisotropy, and the dielectric loss originated from the multilevel interface and polarization characteristics between the core and the shell. Therefore, this work provides an approach to design core-shell nanocomposites with enhanced EMWA performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Qiuyu Fang,Jialiang Luo,Chenghong Zhang,Wei Wang,Wei Ding,Ganhong Zheng,Zhigao Sheng
The phase selectivity and morphology of materials is an effective strategy to improve the electromagnetic wave absorption (EMWA). However, the preparation of EMWA materials with both controllable phase component and adjustable morphology remains a great challenge. Herein, a strategy of phase regulation through high magnetic field is proposed to achieve controllable adjustment of the phase and morphology of iron sulfide, thus promoting interface polarization to improve the EMWA performance. When a high magnetic field is introduced into the reaction, the single Fe3S4 phase is gradually evolved into FeS2 due to the action of magnetizing energy, which presents in the form of Fe3S4/FeS2 composite. And with the increase of magnetic field intensity, FeS2 content increases gradually. In addition, the magnetic field also induces the assembly of Fe3S4/FeS2 and tends to be staggered. Due to the regulation of phase and morphology, accompanied by the redistribution of conductive loss and interfacial polarization, so that the EMWA property of iron sulfide is effectively regulated. 9 T sample with a good impedance matching exhibits a minimum reflection loss value of −50.31 dB, and the effective absorption bandwidth (EAB) is extended to 4.5 GHz. This work has important guidance and inspiration for the design of phase and morphology controlled by the high magnetic field, and it has great application potential in regulating EMWA performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junyi Lv,Houbo Xie,Jingzhe Zhang,Guodong Yang,Tao Li,Jinbo Wu,Faliang Li,Haijun Zhang
Ti 3 AlC 2 , notable for its distinctive combination of metallic and ceramic properties, has attracted significant attention. The rapid synthesis of Ti 3 AlC 2 powders is crucial for mass production. In this study, Ti 3 AlC 2 powders with 85 wt% purity were synthesized efficiently using selective laser melting method, utilizing titanium powder, aluminum powder and titanium carbide particles as starting materials. This innovative method reduces synthesis time by a factor of approximately 30–240 compared to traditional heating techniques. Moreover, the apparent oxidation activation energy ( E ) and the pre-exponential factor of the synthesized Ti 3 AlC 2 were calculated as 53.86 kJ/mol and 12.74, respectively. Additionally, a powder composition containing 45 wt% Ti 3 AlC 2 exhibited a maximum reflection loss of −21.5 dB at 8.2 GHz with a thickness of 2.5 mm, achieving effective electromagnetic wave absorption in the frequency range of 7.4 GHz–9.4 GHz.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 34
·11936-11949
·
IF 7.059
Mei Wu,Abdou Karim Darboe,Xiaosi Qi,Ren Xie,Shuijie Qin,Chaoyong Deng,Guanglei Wu,Wei Zhong
It is well-known that suitable optimization of electromagnetic parameters is a feature to achieve outstanding electromagnetic wave absorption performances (EMWAPs). Accordingly, an effective way to develop high-performance microwave absorbers is to construct dielectric–magnetic core/shell structure nanocomposites with a controllable microstructure and composition parameters. Herein, we propose a simple route to synthesize core/shell structure nanocomposites consisting of carbon nanotubes (CNTs) as the core and magnetic nanoparticles as the shell via a one-step hydrothermal method. By adjusting the experimental parameters, core/shell structure CNTs/CoxFe3−xO4 nanocomposites with different morphologies, contents of CNTs, Co : Fe molar ratios and types of CNTs were selectively synthesized. Also, the electromagnetic properties and EMWAPs of the obtained samples were highly dependent on their microstructure and composition parameters. Thus, by optimizing these parameters, the designed nanocomposites simultaneously exhibited very small values of minimum reflection loss and broad absorption bandwidth with very thin matching thicknesses. Additionally, the outstanding comprehensive EMWAPs of samples were proven to be attributed to their improved impedance matching, attenuation loss characteristics, dielectric loss abilities and excellent synergetic effect. Generally, considering the simple process, environment-friendly, low cost, controllable production and high stability of the nanocomposites, our findings provide an effective way to optimize electromagnetic properties and design high-performance microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junbin Lu,Yurun Feng,Jie Liu,Chunmiao Liu,Yanchun Tong,Shigang Wu,Haibin Sun,Hongyu Gong,Xue Guo
The PDCs (polymer-derived ceramics)-SiCN(Ni) fibers with multiple loss mechanisms were prepared by electrospinning. Influenced by the in-situ formed CNTs and Ni 2 Si at the high treatment temperature, the impedance matching performance of fibers was enhanced obviously. In addition, the electromagnetic wave (EMW) absorbing performance was further improved by unique one-dimensional structure of fibers, interfacial polarization, dipole polarization and magnetic loss. Because of good impedance matching and multiple losses, fibers possessed admirable EMW characteristic with strong absorbing ability of the minimum reflection loss (RL) reaching −44.88 dB and the widest effective absorption band (EAB) reaching 4.8 GHz (13.2–18 GHz) at 1.42 mm. Hence, SiCN(Ni) ceramics prepared had a wide application in the field of electromagnetic absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Lei Jia,Linwen Jiang,Wenli Zheng,Jingwu Wu,Junli Feng
FeCoNiMnSi x (x = 0.1, 0.2, 0.3, 0.4, and 0.5) HEAs were synthesized by utilizing a novel high-energy ball-milling technique. When the Si content reached 0.3, the phase structure will transform from FCC to BCC. In terms of high-temperature oxidation resistance, Si may dramatically minimize the oxidation level of the alloys at high temperatures, hence improving the high-temperature oxidation resistance . The addition of Si to the alloys had slight influence on the corrosion resistance . Additionally, incorporating an appropriate amount of Si may also reduce magnetic loss, promote impedance matching, and improve electromagnetic-wave loss capabilities. FeCoNiMnSi 0.3 exhibits good electromagnetic-wave absorption capability with a minimum reflection loss value of − 48.6 dB at 4.24 GHz and an effective absorption width of 4.81 GHz at 2.03 mm thickness. This study is necessary for the investigation of electromagnetic-wave materials with practical applications at high temperatures.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 5
·3339-3352
·
IF 3.784
Junjie Qian,Bin Du,Chao He,Mei Cai,Xinrong Zhong,Sizhu Ren,Jiayi Lou,Anze Shui
The development of electromagnetic wave (EMW) absorption materials with lightweight, wide absorption bandwidth, thin thickness, and strong EMW absorption performance has become a hotspot. Herein, the morphology-controlled preparation of α-manganese dioxide (α-MnO 2 ) was successfully obtained via a facile hydrothermal method, and the EMW absorption performance of α-MnO 2 was investigated in detail. The results indicated the as-obtained Mn-1.0-120 possessed the best EMW absorption performance with minimum reflection loss of −53.43 dB at about 5.2 GHz with a thickness of 4.1 mm originated from the synergistic effects of multiply scattering, dielectric loss, and magnetic loss. This contribution demonstrates that the MnO 2 has promising candidates with a tunable EMW absorption performance for applications in the electromagnetic field in the future.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）