Bimetallic MOF-derived porous CoNi/C nanocomposites with ultra-wide band microwave absorption properties

2019 ◽  
Vol 43 (42) ◽  
pp. 16546-16554 ◽  
Author(s):  
Chang Liu ◽  
Jing Qiao ◽  
Xue Zhang ◽  
Dongmei Xu ◽  
Nannan Wu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Fine Particles ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Target Product ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing ◽  
Distributed Elements

The CoNi bimetallic MOF-derived composites were synthesized in this work. The target product is composed of fine particles with uniformly distributed elements of Ni, Co, C. The CoNi/C-650 sample displays good microwave absorbing properties.

Improved dielectric properties and microwave absorbing properties of SiC Nanorods/Ni core-shell structure

2017 ◽  
Vol 10 (06) ◽  
pp. 1750069 ◽  
Author(s):  
Huijing Yang ◽  
Qinglu Wang ◽  
Li Wang ◽  
Zelin Zhang ◽  
Yuanlin Li ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Absorption ◽  
Shell Structure ◽  
Solution Method ◽  
Core Shell ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Core Shell Structure ◽  
Microwave Absorbing

We synthesized SiC nanorods/Ni core-shell structure (SiCR-Ni) by a facile solution method and researched their dielectric and microwave absorption properties. The dielectric and microwave absorbing properties of SiCR-Ni are superior to SiC nanorods (SiC[Formula: see text]. The maximum absorption peak of SiCR-Ni is almost three times that of SiCR. The bandwidth of effective absorption of SiCR-Ni covers 64% of [Formula: see text]-band. The improved properties of SiCR-Ni originate from multi-polarization in the special core-shell structure of SiCR-Ni.

scholarly journals Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

RSC Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 1172-1180 ◽  
Author(s):  
Rambabu Kuchi ◽  
Taha Latif ◽  
Sung Woo Lee ◽  
Viet Dongquoc ◽  
Phuoc Cao Van ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Impedance Matching ◽  
Core Shell ◽  
Electric Permittivity ◽  
Next Generation ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing

Controlling impedance matching and enhancing absorption properties are crucial for developing next-generation microwave absorbing materials.

scholarly journals Bimetallic zeolitic imidazolate frameworks-derived porous carbon-based materials with efficient synergistic microwave absorption properties: the role of calcining temperature

RSC Advances ◽  
2017 ◽  
Vol 7 (73) ◽  
pp. 46436-46444 ◽  
Author(s):  
Suyun Wang ◽  
Xiang Ke ◽  
Suting Zhong ◽  
Yaru Lai ◽  
Danlin Qian ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Porous Carbon ◽  
Zeolitic Imidazolate Frameworks ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Graphitized Carbon ◽  
Microwave Absorbing ◽  
Carbon Based

The porous and graphitized carbon-based materials prepared by sacrificing template and in situ reduction show an excellent microwave absorbing performance.

EMI and microwave absorbing efficiency of polyaniline-functionalized reduced graphene oxide/γ-Fe2O3/epoxy nanocomposite

Soft Matter ◽  
2020 ◽  
Vol 16 (28) ◽  
pp. 6643-6653 ◽  
Author(s):  
Rimpa Jaiswal ◽  
Kavita Agarwal ◽  
Rakesh Kumar ◽  
Ritush Kumar ◽  
Kingsuk Mukhopadhyay ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Epoxy Nanocomposite ◽  
Reduced Graphene ◽  
Mixing Method ◽  
Microwave Absorbing

Polyaniline-decorated RGPF prepared by the solution mixing method in three different ratios (1 : 3, 1 : 1 and 3 : 1) of polyaniline-decorated reduced graphene oxide and ferrite have been studied for microwave absorption properties in defence application.

Microwave Absorbing Properties of FeXCo1-X(x=0.7, 0.8) Alloys with Spherical Nanoparticles

2011 ◽  
Vol 299-300 ◽  
pp. 484-488
Author(s):  
Fei Wang ◽  
Lian Zhu Zhang
Keyword(s):  
High Resistivity ◽  
Alloy Nanoparticles ◽  
Body Centered Cubic ◽  
Spherical Nanoparticles ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Fe Content ◽  
Bcc Structure ◽  
Microwave Absorbing

FexCo1-xalloys were prepared by low temperature hydrothermal method. The influence of Fe content on static magnetic and microwave absorbing properties was studied. XRD results show that FexCo1-xalloys are single-phased body-centered cubic (BCC) structure for both 70% and 80% Fe content. The lattice constant of the alloys increases with increasing Fe content. The coercivity decreases with the increase of Fe content. The composites with high resistivity were prepared by homogeneously mixing FexCo1-xalloy nanoparticles and paraffin wax, and their microwave absorption properties were studied.

Synthesis and Microwave Absorbing Properties of Ni/SiO2 Core/Shell Particles

2010 ◽  
Vol 160-162 ◽  
pp. 945-950
Author(s):  
Bo Chong Wang ◽  
Tao Wang ◽  
Liang Qiao ◽  
Fa Shen Li
Keyword(s):  
Impedance Match ◽  
Core Shell ◽  
Frequency Range ◽  
Soft Magnetic ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Hydrolysis Method ◽  
Microwave Absorbing ◽  
Shell Particles

In this paper, we report on the microwave absorbing properties of the Ni/SiO2 core/shell soft magnetic material which was synthesized by the tetraethyl orthosilicate (TEOS) hydrolysis method. The SEM patterns were shown that the particles of Ni/SiO2 were more dispersed and homogeneous. Microwave absorbing properties were measured in the range of 0.1–18 GHz. A reflection loss (RL) exceeding −20 dB in the frequency range of 2.6–8.9 GHz was achieved for an absorber thickness of 2.0–5.6 mm, and an optimal RL of −49.5 dB was obtained at 4.4 GHz for the thickness of 3.5 mm. The good microwave absorption properties resulted from a proper impedance match as a consequence of the insulator SiO2 around Ni particles.

The Influence of Sintering Temperature and Mn-Ti Doped BaFe12O19 on the Microwave Absorbing Properties

2015 ◽  
Vol 754-755 ◽  
pp. 733-737
Author(s):  
M.N. Nasruddin ◽  
Tulus Ikhsan Nasution ◽  
M.S. Achmad ◽  
K. Candra ◽  
F.N. Lukman ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Sintering Temperature ◽  
Barium Hexaferrite ◽  
Solid State Reaction Method ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Magnetizing Force ◽  
Microwave Absorbing

The effect of sintering temperature and Mn-Ti (x = 0.1 and 0.5 % mol) doped in Barium hexaferrite (BaFe12O19) on the microwave absorption properties have been investigated. The BaFe(12-2x)MnxTixO19samples were prepared by using a solid state reaction method from technical grade materials of BaCO3, Fe2O3, MnO2, and TiO2. The permagraph and vector network analyzer (VNA) measurement with frequency of 4 – 10 GHz were used to determine the magnetic properties and microwave absorbing properties, respectively. The magnetic induction and magnetizing force (B-H) curve analysis of BaFe(12-2x)MnxTixO19revealed that by increasing the Mn-Ti dopant concentrations, the remanence (Br) and BH(max) increases, meanwhile, the HCBvalue decreases for both 1100 and 1150oC. The frequency dependence of reflection loss (RL) measurement given anoptimum value of-26.15 dB at frequency of 9.18 GHz which obtained by x = 0.1% mol Mn-Ti (1100oC). The maximum absorption peak was achieved for 0.5 % mol Mn-Ti sample with ~98.3 % at 9.18 GHz. By controlling the sintering temperature and Mn-Ti dopant concentration, the RL and absorption behavior can be modified to desirable values and also indicates that higher Mn-Ti dopant concentration (0.5% mol) possess better absorbing characteristics. Furthermore, it was found that complex permitivitty and permeability values of BaFe12O19can be modified by controlling the Mn-Ti dopant concentration.

Microwave absorption properties of hexagonal barium doped @cip composite in wide band

2018 ◽  
Vol 209 ◽  
pp. 298-302 ◽  
Author(s):  
F.Z. Mohammad ◽  
H. Arshad ◽  
M. Mudsar ◽  
S. Jawad ◽  
K.M. Ali
Keyword(s):  
Microwave Absorption ◽  
Wide Band ◽  
Absorption Properties ◽  
Microwave Absorption Properties

Synthesis of high purity chain-like carbon nanospheres in ultrahigh yield, and their microwave absorption properties

RSC Advances ◽  
2015 ◽  
Vol 5 (21) ◽  
pp. 16010-16016 ◽  
Author(s):  
Xiaosi Qi ◽  
Jianle Xu ◽  
Wei Zhong ◽  
Youwei Du
Keyword(s):  
Microwave Absorption ◽  
High Purity ◽  
Mass Production ◽  
Simple Approach ◽  
Carbon Nanospheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing

In the article, we report a simple approach for the mass production of chain-like CNSs over Fe/SnO2 nanoparticles. And ultrahigh yields (309) of CNCs were reported, and the as-synthesized chain-like CNSs exhibit good microwave absorbing ability.

Preparation of graphene/Fe3O4/Ni electromagnetic microwave absorbing nano-composite materials

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940055 ◽  
Author(s):  
Yu-Wei Huang ◽  
Yu-Jiang Wang ◽  
Shi-Cheng Wei ◽  
Yi Liang ◽  
Wei Huang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Photoelectron Spectroscopy ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Nano Composite ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
One Step ◽  
Microwave Absorbing

Graphene/Fe3O4/Ni nano-composite materials were prepared by one-step hydrothermal method from RGO, FeCl3 ⋅ 6H2O and purity Ni. The structure and electromagnetic microwave absorbing properties were investigated systematically by field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and vector network analyzer (VNA). The reflectance was simulated based on the electromagnetic parameters to evaluate the absorption properties of the sample. The results show that Fe3O4 and Ni are on the surface of graphene evenly, the composites exhibit excellent microwave absorption properties, reflection loss and broad effective absorption bandwidth are −16.38 dB and 3.60 GHz, as the paraffin wax is 40% and the matching thickness is 2.00–3.50 mm.

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