Carbon encapsulated nanoscale iron/iron-carbide/graphite particles for EMI shielding and microwave absorption

2017 ◽  
Vol 19 (34) ◽  
pp. 23268-23279 ◽  
Author(s):  
Rajeev Kumar ◽  
Harish Kumar Choudhary ◽  
Shital Patangrao Pawar ◽  
Suryasarathi Bose ◽  
Balaram Sahoo
Keyword(s):  
Microwave Absorption ◽  
Multiple Scattering ◽  
Metallic Iron ◽  
Iron Carbide ◽  
Interfacial Polarization ◽  
Emi Shielding ◽  
Graphite Particles ◽  
Iron Iron

Dispersed metallic-iron and dielectric-Fe3C nanoparticles in carbon globules facilitate multiple scattering and absorption of EM-waves through large interfacial polarization.

Polyaniline-coated SnO/Y 2 O 3 Nanocomposites for Broadband EMI Shielding and Microwave Absorption

2017 ◽  
Vol 4 (11) ◽  
pp. 12039-12044 ◽  
Author(s):  
Muhammad Faisal ◽  
Ritwik Giri ◽  
Shivam Sood
Keyword(s):  
Microwave Absorption ◽  
Emi Shielding

Synthesis and characterization of carbon-encapsulated iron/iron carbide nanoparticles by a detonation method

Carbon ◽  
2010 ◽  
Vol 48 (13) ◽  
pp. 3858-3863 ◽  
Author(s):  
Ning Luo ◽  
Xiaojie Li ◽  
Xiaohong Wang ◽  
Honghao Yan ◽  
Chengjiao Zhang ◽  
...  
Keyword(s):  
Iron Carbide ◽  
Synthesis And Characterization ◽  
Detonation Method ◽  
Iron Iron

Microstructure, Stiffness and Corrosion of Bare and Phosphated Specimens Made by Sintering of Structured Iron-Iron Oxide Spheres

2020 ◽  
Vol 405 ◽  
pp. 411-416
Author(s):  
Miriam Kupková ◽  
Martin Kupka ◽  
Renáta Oriňáková ◽  
Radka Gorejová
Keyword(s):  
Iron Oxide ◽  
Iron Oxides ◽  
Metallic Iron ◽  
Galvanic Corrosion ◽  
Iron Phosphate ◽  
Reduction Reaction ◽  
Diffusion Control ◽  
Iron Oxide Particles ◽  
Flow Through ◽  
Iron Iron

Granulated iron oxide particles were incompletely reduced to structured particles comprised metallic iron and residual iron oxides. Structured particles were pressed into prismatic compacts and sintered. Some of sintered specimens were subsequently phosphatized and calcined. Specimens with an iron phosphate coating were found stiffer than specimens without coating. In Hanks' solution, a galvanic corrosion was induced by more noble iron oxides coupled to a less noble metallic iron. This could explain higher corrosion potentials and higher rates of iron dissolution in comparison with a pure iron. The coating of specimens with iron phosphates shifted corrosion potentials towards more negative values and slowed down the dissolution of iron. This was most likely caused by a reduction in oxygen flow through the coating to iron-oxide cathodes, which has enhanced the influence of diffusion control on the kinetics of reduction reaction.

Dual-Interfacial Polarization Enhancement to Design Tunable Microwave Absorption Nanofibers of SiC@C@PPy

2020 ◽  
Vol 2 (6) ◽  
pp. 1505-1513 ◽  
Author(s):  
Chang Xu ◽  
Fan Wu ◽  
Liqun Duan ◽  
Ziming Xiong ◽  
Yilu Xia ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Interfacial Polarization ◽  
Tunable Microwave

Sustainable wood-based composites for microwave absorption and electromagnetic interference shielding

2020 ◽  
Vol 8 (46) ◽  
pp. 24267-24283 ◽  
Author(s):  
Ming Zhou ◽  
Weihua Gu ◽  
Gehuan Wang ◽  
Jing Zheng ◽  
Chunchuan Pei ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Electromagnetic Interference ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding

In this review, wood-based composites for efficient EMI shielding and MA are comprehensively introduced.

scholarly journals Investigation of Microwave Absorption Performance of CoFe2O4/NiFe2O4/Carbon Fiber Composite Coated with Polypyrrole in X-Band Frequency

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 809
Author(s):  
Rozhin Sadeghi ◽  
Abbas Sharifi ◽  
Marta Orlowska ◽  
Isabelle Huynen
Keyword(s):  
Carbon Fiber ◽  
Microwave Absorption ◽  
In Situ Polymerization ◽  
Fiber Composite ◽  
Sol Gel ◽  
Interfacial Polarization ◽  
Microwave Absorber ◽  
Carbon Fiber Composite ◽  
Band Frequency ◽  
5 Ghz

The current research reports the preparation of a microwave absorber containing CoFe2O4/NiFe2O4/Carbon fiber (H/S/CF) coated with polypyrrole polymer (PPy@H/S/CF) through sol-gel and in-situ polymerization processes. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM), and a vector network analyzer (VNA) are utilized to evaluate the features of the prepared composite. The microstructure analysis results revealed carbon fibers well decorated with submicron-size particles having hard/soft magnetic phases and thoroughly coated with polymer. The paraffin-based microwave absorber sample filled with 45 wt.% of PPy@H/S/CF has simultaneously both magnetic and dielectric losses in the 8.2–12.4  GHz frequency range. The absorber is used in a Salisbury screen configuration aiming at reducing the radar cross-section of objects. A minimum reflection loss of −55  dB at 10.6 GHz frequency with 5 GHz bandwidth is obtained for the sample with a 2  mm thickness. Different mechanisms, such as interfacial polarization, ferromagnetic resonance, and electron hopping, are the main factors for achieving such an appropriate microwave absorption. These results suggest that the PPy@H/S/CF composite is an ideal candidate for microwave absorption applications requiring high performance and low thickness.

Sign in / Sign up

Export Citation Format

Share Document