JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zijian Liao,Mingliang Ma,Yuxin Bi,Zhouyu Tong,Kwok L. Chung,Zijian Li,Yong Ma,Binglong Gao,Zhengkai Cao,Ranran Sun,Xiang Zhong
Advanced microwave absorption (MA) materials have attracted widespread attention to meet the challenges of electromagnetic (EM) pollution. Herein, MgFe 2 O 4 /MgO/C fibers were successfully prepared via electrospinning technology and carbonization , and their surfaces were coated by MoS 2 via hydrothermal method . The EM wave absorption performance of composites was enhanced due to the introduction of MoS 2 . The results showed that the EM wave absorption performance of MgFe 2 O 4 /MgO/C could not meet the requirements due to low dielectric loss and poor impedance matching. The performance of the composites was improved after coating of MoS 2 , which showed the strong wave absorption capability and the broad absorption bandwidth. The optimal reflection loss (RL) is −56.94 dB at 9.5 GHz and the effective absorption bandwidth is 3.9 GHz (8.08–11.98 GHz) with a thickness of 2.7 mm. The excellent MA performance can be mainly attributed to excellent synergistic effect between MgFe 2 O 4 /MgO/C and MoS 2 . Furthermore, MoS 2 also contributes to dielectric loss and ideal impedance matching. MgFe 2 O 4 /MgO/C@MoS 2 composites may be utilized for lightweight and high-efficient MA materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2021
·Vol. 19
·期 2
·813-827
·
IF 1.968
Cong Zhou,Shuang Li,Zhaoju Yu
Iron-containing PSO precursors (FePSO) were synthesized by modification of polysiloxane with different amounts of ferric acetylacetonate [Fe(acac) 3 ], then porous SiFeCO ceramics were successfully prepared by subsequent pyrolysis. The chemical modification and ceramization process of PFSO precursors were studied by FT-IR and TGA measurements. XRD patterns imply that the SiC crystalline can be easily observed when PFSO was exposed to 1200℃ in nitrogen atmosphere, while pure PSO exhibited broad diffraction peaks of SiC at 1500℃, meaning that the grain coarsening of SiC was accelerated by adding iron. The crystallization behavior of ferric silicide (Fe x Si y ) is complex due to the variation of iron content in feed and annealing temperature, and Fe x Si y /SiC@SiOC nanocomposites were produced after annealing. Because of the in-situ formation of SiC, Fe x Si y , and carbon strips in nanocomposites, PFSO-derived ceramics demonstrate enhanced microwave absorption performance. The best effective absorption bandwidth (<−10 dB) and the minimum reflection loss are 2.6 GHz and −38 dB, respectively, which are achieved in the sample PFSO-3–1300℃. Fe x Si y /SiC@SiOC nanocomposites synthesized in this work exhibit potential application in the field of electromagnetic interference, the carbon content and the crystallization behavior of Fe x Si y are the critical factors for the performance optimization.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Qingwei Liu,Min Zeng,Jue Liu,Baiyu Guo,Xiaozhu Hao,Qian Cao,Yuchen Shang,Xin Sun,Jinzhang Liu,Xuexu Gao,jiheng Li,Jie Zhu,Xixiang Zhang,Ronghai Yu
Environment-friendly Fe-based material@N-doped carbon nanoparticles imbedded in polylactic acid (PLA) matrix are prepared and applied in microwave absorption field. In the synthesis process, polydopamine (PDA) in the precursor could rationally regulate the phases of the iron-based particles and carbon contents. It turns out that optimizing the chemical composition plays a vital role in modulating microwave absorption performance . For instance, the maximum reflection loss ( R Lmax ) for Fe@N-doped carbon particles (S-120) reaches −61.6 dB (12.56 GHz, 2.1 mm), and the effective bandwidth is 4.48 GHz (from 13.52 GHz to 18 GHz) with a thickness of only 1.7 mm. The excellent microwave absorption performance could be attributed to perfect impedance matching brought by the synergies of multiple components. Moreover, the microwave absorbers display not only high microwave absorption performance but also environment-friendly characteristics that can avoid leaving stubborn waste after failure. The preparation process of the composite is pollution-free and the PLA in the composite can almost be naturally degraded within one month under simulated marine environment. This work may provide a new perspective on preparing high-efficient functional materials which are also harmless to the environment.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Guangzhen Cui,Xin Zheng,Xuliang Lv,Qi Jia,Wei Xie,Guangxin Gu
MXene materials with efficient electromagnetic (EM) microwave absorber applications are in high demand. Herein, the EM wave absorption properties of two-dimensional MXene Ti 3 C 2 T x , fabricated by etching the Ti 3 AlC 2 phase with an enchant of HCl and LiF, was thoroughly investigated over a frequency range of 2–18 GHz. In addition, the impact of three critical factors (reactant concentration, reaction time, and reaction temperature) on the morphology control and dielectric properties was discussed. With increasing degree of exfoliation, the multilayer structure of Ti 3 C 2 T x changed gradually, thereby further influencing the microwave absorption properties. Among the etched samples, Ti 3 C 2 T x prepared with 9 M HCl at 35 °C for 24 h exhibited an excellent reflection loss of −40.8 dB at 13.9 GHz with a thickness of 1.45 mm, while also possessed the broadest effective bandwidth, reaching 3.66 GHz at 1.68 mm. The demonstrated EM wave response mechanism, indicated that the conduction loss and polarization loss contribute significantly to the EM wave absorption performance. These findings endow the Ti 3 C 2 T x material with an effective foundation for the construction of novel EM wave absorbers.
研究领域:
材料科学
·
电磁学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 2
·1374-1382
·
IF 2.324
Yang Qixin,Yang Wentong,Shi Yiyuan,Yu Lujun,Li Xiang,Yu Laiming,Dong Yubing,Zhu Yaofeng,Fu Yaqin
Hierarchical structure composites of loofah derived biomass carbon (PBC) decorated by aligned polyaniline (PANI) were successfully fabricated by simple carbonization and in situ oxidative polymerization. The morphology and structural of composites was studied. The microwave absorbing performance of aligned PANI/PBC was investigated in the frequency range of 2–18 GHz. The results indicated that aligned PANI/PBC with special structure possessed more distinct dielectric response characteristics and enhanced microwave absorbing performance. The minimum reflection loss ( RL ) value of aligned PANI/PBC was up to − 44.8 dB at 10.02 GHz and the effective absorption frequency width ( RL < − 10 dB) is in the 5.58–18 GHz range with the thickness range of 1–3 mm. The excellent microwave absorbing performance of aligned PANI/PBC was mainly correlate with the multiple relaxation polarization, good impedance matching and the synergistic effect between PANI nanorods and PBC.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ri Xiang,Lichun Cheng,Haiying Qi,Man Wang,Qingrong Yao,Yucheng Chen,Chaohao Hu,Huaiying Zhou
In this study, porous Ce-doped CaFe 0.5 Mn 0.5 O 3–δ (CFMO) with good microwave absorption properties is reported for the first time. Herein, Ce x Ca 1−x Fe 0.5 Mn 0.5 O 3−δ (x = 0, 0.05, 0.1, 0.15) (Ce-CFMO) sample powders were prepared by sol–gel method after calcination at 750 °C. Ce-CFMO was characterized by XRD , SEM, TEM , XPS , and VSM, and the Ce-CFMO was also mixed with paraffin wax for VNA. The addition of Ce led to enhanced porosity, enhanced interfacial polarization, enhanced defect polarization, and higher oxygen vacancy content in the CFMO. This resulted in enhanced charge polarization and dipole polarization as well as significant optimization of the impedance matching of CFMO. The unique pore structure of the CFMO is the main reason for its microwave absorption performance. Moreover, the preparation method of this material is simple and its cost is low, providing it with wide application prospects. CFMO has not yet been applied in the field of microwave absorbing materials, and there is still a lot of room for development in the future.
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
·
2023
·
IF 5.2
Xuan Wang,Zhenkuang Lei,Chunlin Zheng,Xueheng Zhuang,Qikui Man,Guoguo Tan
Semiconductor metal oxides are widely used in the field of wave absorption because of their easily tunable dielectric properties . Doping or modulating the morphology has been demonstrated to be an effective method to improve the microwave (MW) absorbing performance of semiconductor metal oxides. In this study, Ce-doped SnO 2 was prepared by a simple and effective coprecipitation method. Single-crystal SnO 2 nanorods were generated during the doping process and the size of the nanorods could be controlled by modifying the concentration of Ce. The presence of nanorods greatly enhances the MW absorbing performance: when the doping molar ratio is 3%, the minimum reflection loss of the absorber is −77.91 dB at a frequency of 13.79 GHz with a thickness of 1.6 mm and the maximum effective absorbing bandwidth is 4.47 GHz at a thickness of 1.5 mm. Excellent MW absorbing performance of Ce-doped SnO 2 is attributed to its excellent impedance matching and interfacial polarization.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 18
·1-13
·
IF 2.8
Li Chaojie,Feng Yonghang,Cui Yi,Zhang Fan,Lv Dongfeng,Liu Pan,Wei Yingna,Wei Hengyong,Bu Jinglong
The NiCo 2 O 4 nanoflakes/SiC fibers composites were prepared by electrospinning, carbon thermal reduction combined with hydrothermal method. The results of SEM, XRD and XPS suggested that the NiCo 2 O 4 nanoflakes/SiC fibers composites were successfully prepared. The NiCo 2 O 4 nanoflakes were generated on the surface of SiC fibers with uniform distribution and loose structure. The NiCo 2 O 4 nanoflakes/SiC fibers composites possess the porous structure and their BET specific surface area is 233.2 m 2 /g. The BJH average pore size and the pore volume are 7.0 nm and 0.4 cm 3 /g, respectively. The structure of fibers and pores can bring the multiple reflections and scatterings, interface polarizations, dipole polarizations and conductivity losses. In addition, there is the synergistic effect of dielectric loss and the magnetic loss in NiCo 2 O 4 nanoflakes/SiC fibers composites. Therefore, the reflection loss of NiCo 2 O 4 nanoflakes/SiC fibers composites could achieve − 56 dB under the thickness of 6 mm at 17.64 GHz, which showed the better microwave absorption behavior than SiC fibers.
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 Research and Technology-JMR&T
·
2023
·
IF 6.4
Yufeng Bai,Dawei Liu,Tingting Yang,Zhongyang Duan,Tai Peng
Nowadays, electromagnetic pollution caused by electronic devices is gradually becoming a concern. Moreover, as the frequency of electromagnetic pollution from electronic devices is mainly in the range of 2–10 GHz, the design of microwave-absorbing materials for this frequency range has become a hot issue. To tackle the issue, core-shell structured hexagonal boron nitride (h-BN) @polyaniline (PAn) composites have been proposed to construct heterogeneous microwave-absorbing materials. Firstly, the h-BN is exfoliated, and hydroxyl functionalized to produce hydroxy boron nitride (OH-BN), which enhances its polarization ability by structuring defects and adding functional groups to improve its microwave absorption efficiency. Afterward, PAn was grafted on the OH-BN surface by in situ polymerization. The microwave absorption properties of OH-BN@PAn composites can be tuned by modulating the doping of PAn. As expected, the OH-BN@PAn composite exhibits superior microwave absorption properties with the minimum reflection loss (RLmin) value of −38.60 dB at 3.5 mm and an effective absorption bandwidth (EAB) of 3.4 GHz (6.24–8.64 GHz) at pH = 2. Also, the composite achieves effective microwave absorption at 3.76–18 GHz by adjusting the matching thickness. Notably, the RLmin value of OH-BN@PAn was successfully tuned from the high-frequency region (12.4 GHz, pH = 0) to the low-frequency region (7.28 GHz, pH = 2) by adjusting the doping degree. In addition, the RL value and EAB width have been increased due to the increased impedance matching and polarization capability. This work can provide a reference for constructing composite microwave-absorbing materials and regulating microwave absorption performance.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Linying Huang,Hui Wang,Qin Ouyang,Gaoming Mo,Jing Huang,Yueqing Zheng,Qing Huang
Polymer-derived silicon carbide (SiC) fibers are excellent structural and functional materials for extreme environments. However, the low efficiency of the curing process and the inferior stability of the amorphous SiC x O y phase have limited their large-scale preparation and widespread application. In this study, phenylboronic acid (PBA)-modified polyaluminocarbosilane (PACS) electrospun fibers were cured efficiently via an electron beam irradiation oxidation technique, and then converted into highly crystalline SiC fibers with low oxygen content by high-temperature sintering. The combination of irradiation oxidation and subsequent annealing treatment facilitated the effective, rapid, and sufficient curing of PACS fibers. Notably, boron played a significant role in inhibiting the growth of SiC grains and promoting the graphitization of free carbon. The SiC fibers obtained from PBA-modified PACS through irradiation oxidation curing exhibited superior electrical conductivity and microwave absorption performance, achieving a minimal reflection loss (RL) of −41.8 dB at 12 GHz with a thickness of 1.5 mm. This work provides an effective method for preparing SiC fibers with tunable carbon structures and enhanced microwave absorption properties, thereby paving a way for expanding their applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2022
·
IF 3.097
Qingkai Yang,Haiqing Qin,Kailin Huang,Rui Zhang,Lu Yang,Zhao Lu,Qingrong Yao,Lichun Cheng,Caimin Huang,Qianxin Long,Jiang Wang,Huaiying Zhou
To investigate the magnetic and microwave absorption properties of PrFeO 3 ceramic, the traditional solid-state reaction and sol–gel methods were used. The results show that only an orthorhombic crystal structure was detected by X-ray diffraction and transmission electron microscopy. Interestingly, heat treatment can greatly improve the coercivity of PrFeO 3 ceramic and thus change the magnetic properties from antiferromagnetic to ferromagnetic. The high correlation between the magnetization parameters and bonding characteristics indicated that signifificant contracting of the Fe 3+ O c 2− bonds and decrease in Fe 3+ O d 2− Fe 3+ linkage angles were the main origins of the strong ferromagnetism in the PrFeO 3 ceramic. The PrFeO 3 sample prepared by sol–gel method has good reflection loss. When the simulated thickness is 2 mm, the reflection loss reaches −36.87 dB at 15.92 GHz. The preparation process of the sol–gel method is simple and can be used to synthesize single phase at low temperature, but it is only suitable for the synthesis and performance testing of single phase. The solid-state reation method can be used to determine the phase relationship and phase properties, but it requires high temperature and long annealing time. The experimental results show that the sol–gel method is more suitable for the study of material properties. These results demonstrate the potential application of PrFeO 3 ceramics in magnetic materials and microwave absorbing field.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Jianglin Diao,Zhihao Cai,Lun Xia,Ziyuan Wang,Zhanzhao Yin,Xiaoyan Liu,Wenle Ma,Yi Huang
Graphene foam (GF) has grabbed considerable attention for microwave absorption (MA) due to its high specific surface area, rich micro-nano structures and versatile processing. However, restricted by the intrinsic electromagnetic properties of graphene, the MA property of GF is usually unsatisfactory. To further improve the absorption strength of GF, groundbreakingly, the thermoelectric material Bi 2 Te 2 .7 Se 0.3 (BTS) and graphene are combined to form Bi 2 Te 2 .7 Se 0.3 /GF (BTSGF) composites through a solvothermal self-assembly method. BTSGF composites have achieved much enhanced MA properties. The minimal reflection loss (RL min ) and the qualified absorption bandwidth of BTS9GF-200 (90 wt% BTS, annealed at 200 °C) reaches improved −73.0 dB and 5.32 GHz, respectively. Meanwhile, BTS3GF-300 (30 wt% BTS, annealed at 300 °C) exhibits an impressive qualified absorption bandwidth of 8.9 GHz and achieves an enhanced RL min of −58 dB. The enhanced MA performance of BTSGF stems from various synergistic effects of BTS and GF, such as conduction loss and polarization. More importantly, BTS's thermal energy-electric energy conversion capability is believed to can quickly convert heat into electricity and strengthen the attenuation of electromagnetic waves. Therefore, a new electromagnetic wave-thermo-electric loss MA mechanism is proposed, which is of great significance to the study of thermoelectric materials as high-efficiency MA materials .
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）