0.4 μm Diameter Nickel-Filament Silicone-Matrix Resilient Composites for Electromagnetic Interference Shielding

1997 ◽  
Vol 119 (4) ◽  
pp. 236-238 ◽  
Author(s):  
Xiaoping Shui ◽  
D. D. L. Chung
Keyword(s):  
Electromagnetic Interference ◽  
Small Diameter ◽  
Matrix Composites ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Volume Percent ◽  
Emi Shielding Effectiveness ◽  
Percent Nickel ◽  
Silicone Matrix

Resilient silicone-matrix composites containing 7–13 volume percent nickel filaments (0.4 μm diameter) exhibited 74–93 dB electromagnetic interference (EMI) shielding effectiveness at 1–2 GHz and 1 × 10−1 – 2 × 10−2 Ω cm DC volume electrical resistivity. The high shielding effectiveness is due to the small diameter of the nickel filaments. The composites are useful for EMI shielding gaskets and cable jackets.

Nickel Fiber Silicone-Matrix Composites as Resilient Electrical Conductors

1991 ◽  
Vol 113 (4) ◽  
pp. 417-420 ◽  
Author(s):  
Mingguang Zhu ◽  
D. D. L. Chung
Keyword(s):  
Electrical Resistivity ◽  
Electromagnetic Interference ◽  
Coefficient Of Thermal Expansion ◽  
Electrical Contacts ◽  
Matrix Composites ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electrically Conducting ◽  
Emi Shielding Effectiveness ◽  
Silicone Matrix

Short nickel fiber silicone-matrix composites containing 3–12 vol. percent fibers were fabricated by the impregnation of silicone into a nickel fiber perform. The composites exhibited volume electrical resistivity ranging from 4.5 × 10−4 to 2.8 × 10−3 ohm.cm, contact electrical resistivity (with copper at a pressure > 0.1 MPa) ranging from 0.0090 to 0.0155 ohm.cm2, permanent set one percent after compression to a stress of 0.4 MPa and a strain up to 13.5 percent for 7 days, and electromagnetic interference (EMI) shielding effectiveness > 50 dB at 1.0–2.0 GHz. The volume and contact resistivities were essentially not affected after heating in air at 130–150°C for 7 days. The coefficient of thermal expansion was 27.5 × 10−6 °C−1 for a composite containing 8.2 vol. percent nickel fibers. These resilient electrically conducting composites are useful for electrical contacts and for gaskets for EMI shielding.

Flexible, conductive, porous, fibrillar polymer–gold nanocomposites with enhanced electromagnetic interference shielding and mechanical properties

2017 ◽  
Vol 5 (5) ◽  
pp. 1095-1105 ◽  
Author(s):  
Jun Li ◽  
Hu Liu ◽  
Jiang Guo ◽  
Zhen Hu ◽  
Zhijiang Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gold Nanoparticles ◽  
Self Assembly ◽  
Electromagnetic Interference ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Conductive Nanocomposites ◽  
Gold Nanocomposites

Flexible lightweight conductive nanocomposites prepared by self-assembly of gold nanoparticles on charged polymer nanofibers show enhanced EMI shielding effectiveness and mechanical properties.

A strategy to achieve enhanced electromagnetic interference shielding at ultra-low concentration of multiwall carbon nanotubes in PαMSAN/PMMA blends in the presence of a random copolymer PS-r-PMMA

RSC Advances ◽  
2016 ◽  
Vol 6 (32) ◽  
pp. 26959-26966 ◽  
Author(s):  
Suryasarathi Bose ◽  
Maya Sharma ◽  
Avanish Bharati ◽  
Paula Moldenaers ◽  
Ruth Cardinaels
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
Multiwall Carbon Nanotubes ◽  
Random Copolymer ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Pmma Blends ◽  
Multiwall Carbon

Mediated by the PS-r-PMMA, the MWNTs were mostly localized at the interface and bridged the PMMA droplets. This strategy led to enhance EMI shielding effectiveness at 0.25 wt% MWNTs through multiple scattering from MWNT covered droplets.

Ultrastrong and conductive MXene/cellulose nanofiber films enhanced by hierarchical nano-architecture and interfacial interaction for flexible electromagnetic interference shielding

2019 ◽  
Vol 7 (32) ◽  
pp. 9820-9829 ◽  
Author(s):  
Zeying Zhan ◽  
Quancheng Song ◽  
Zehang Zhou ◽  
Canhui Lu
Keyword(s):  
Mechanical Strength ◽  
Intermolecular Interactions ◽  
Electromagnetic Interference ◽  
Interfacial Interaction ◽  
Cellulose Nanofiber ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness

Ti3C2Tx/TOCNF composite papers present excellent mechanical strength and EMI shielding effectiveness due to their hierarchically aligned structure and strong intermolecular interactions.

Study of Mechanical Properties and EMI Shielding Behaviour of Al6061 Hybrid Metal Matrix Composites

2021 ◽  
pp. 894-911
Author(s):  
Ch Hima Gireesh ◽  
Koona Ramji ◽  
K.G Durga Prasad ◽  
Budumuru Srinu
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Electromagnetic Interference ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
Hybrid Metal Matrix Composites ◽  
Strength And Stiffness

In the present technological environment, the aerospace industry needs cutting-edge materials not only to meet the requirements such as lower weight and higher values of strength and stiffness, but also to protect against electromagnetic interference. In this article, an attempt has been made to prepare Al6061 hybrid metal matrix composites reinforced with varying percentages of SiC, Al2O3, and fly ash particulates through a stir-casting route. As per ASTM standards, various tests have been conducted to know the density, tensile strength, yield strength, and hardness. Simultaneously, all the prepared composites are tested for electromagnetic interference (EMI) shielding effectiveness (SE) under the X band frequency with the help of a vector network analyzer. In order to identify the composite possessing good mechanical properties, as well as shielding effectiveness, a TOPSIS methodology has been employed in this work. The present study reveals that the proposed hybrid composite contains 5% of each reinforcement material which shows better mechanical properties as well as good shielding effectiveness.

Electromagnetic Interference Shielding Characteristics of Carbon Nanofiber-Polymer Composites

2007 ◽  
Vol 7 (2) ◽  
pp. 549-554
Author(s):  
Yonglai Yang ◽  
Mool C. Gupta ◽  
Kenneth L. Dudley ◽  
Roland W. Lawrence
Keyword(s):  
Electromagnetic Interference ◽  
Carbon Nanofiber ◽  
Frequency Region ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Frequency Independent ◽  
Ku Band

Electromagnetic interference (EMI) shielding characteristics of carbon nanofiber-polystyrene composites were investigated in the frequency range of 12.4–18 GHz (Ku-band). It was observed that the shielding effectiveness of such composites was frequency independent, and increased with increasing carbon nanofiber loading within Ku-band. The experimental data exhibited that the shielding effectiveness of the polymer composite containing 20 wt% carbon nanofibers could reach more than 36 dB in the measured frequency region, indicating such composites can be applied to the potential EMI shielding materials. In addition, the results showed that the contribution of reflection to the EMI shielding effectiveness was much larger than that of absorption, implying the primary EMI shielding mechanism of such composites was reflection of electromagnetic radiation within Ku-band.

scholarly journals A Novel Processing for CNT-Reinforced Mg-Matrix Laminated Composites to Enhance the Electromagnetic Shielding Property

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1030 ◽  
Author(s):  
Wanshun Zhang ◽  
Hongyang Zhao ◽  
Xiaodong Hu ◽  
Dongying Ju
Keyword(s):  
Electrophoretic Deposition ◽  
Electromagnetic Interference ◽  
Deposition Time ◽  
Laminated Composites ◽  
Electromagnetic Shielding ◽  
Matrix Composites ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Plane Wave ◽  
Emi Shielding Effectiveness

The microstructure, electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of CNTs/Mg Matrix composites prepared by accumulative roll bonding (ARB) were systematically investigated to understand the effects of CNTs on the electromagnetic interference shielding effectiveness property of magnesium. A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed composites. The experimental results indicated that the methods were feasible to prepare laminated composites. The SE of the material increased gradually with the increase of electrophoretic deposition time. When the electrophoretic deposition time reached 8 min, the value of SE remained 87–95 dB in the frequency range of 8.2–12.4 GHz. The increase in SE was mainly attributed to the improvement in the reflection and multiple reflection losses of incident electromagnetic wave due to the increased amounts of CNTs and interfaces. The methods provided an efficient strategy to produce laminated metal matrix composites with high electromagnetic shielding properties.

Lightweight and flexible hybrid film based on delicate design of electrospun nanofibers for high-performance electromagnetic interference shielding

Nanoscale ◽  
2019 ◽  
Vol 11 (17) ◽  
pp. 8616-8625 ◽  
Author(s):  
Li Huang ◽  
Jianjun Li ◽  
Yibin Li ◽  
Xiaodong He ◽  
Ye Yuan
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Hybrid Film ◽  
Electrospun Nanofibers ◽  
Light Weight ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness

High-performance electromagnetic interference (EMI) shielding materials possess features of light weight, flexibility and excellent EMI shielding effectiveness.

A multi-dimensional and level-by-level assembly strategy for constructing flexible and sandwich-type nanoheterostructures for high-performance electromagnetic interference shielding

Nanoscale ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 3308-3316 ◽  
Author(s):  
Caichao Wan ◽  
Yue Jiao ◽  
Xianjun Li ◽  
Wenyan Tian ◽  
Jian Li ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Free Standing ◽  
Assembly Strategy ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Sandwich Type

A multi-dimensional and level-by-level assembly strategy is developed to construct free-standing and sandwich-type nanoheterostructures achieving an outstanding EMI shielding effectiveness of ∼50.6 dB in the X-band.

Graphene nanosheets/BaTiO3 ceramics as highly efficient electromagnetic interference shielding materials in the X-band

2016 ◽  
Vol 4 (2) ◽  
pp. 371-375 ◽  
Author(s):  
Qing Yuchang ◽  
Wen Qinlong ◽  
Luo Fa ◽  
Zhou Wancheng ◽  
Zhu Dongmei
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Graphene Nanosheets ◽  
Pressureless Sintering ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Highly Efficient ◽  
Emi Shielding Effectiveness ◽  
X Band

Graphene nanosheets filled BaTiO3 ceramics with high-performance EMI shielding effectiveness, greater than 40 dB in the X-band at 1.5 mm thickness, were prepared via pressureless sintering.

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