Carbon nanotubes (CNTs) in ultra-high performance concrete (UHPC): Dispersion, mechanical properties, and electromagnetic interference (EMI) shielding effectiveness (SE)

2020 ◽  
Vol 131 ◽  
pp. 106017 ◽  
Author(s):  
Myungjun Jung ◽  
Young-soon Lee ◽  
Sung-Gul Hong ◽  
Juhyuk Moon
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
High Performance ◽  
High Performance Concrete ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Ultra High Performance Concrete ◽  
Emi Shielding Effectiveness

scholarly journals Ultrathin, Lightweight, and Flexible CNT Buckypaper Enhanced Using MXenes for Electromagnetic Interference Shielding

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Rongliang Yang ◽  
Xuchun Gui ◽  
Li Yao ◽  
Qingmei Hu ◽  
Leilei Yang ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
High Performance ◽  
Electronic Devices ◽  
Deposition Process ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Emi Shielding Effectiveness ◽  
X Band ◽  
Wearable Electronic Devices ◽  
Emi Se

AbstractLightweight, flexibility, and low thickness are urgent requirements for next-generation high-performance electromagnetic interference (EMI) shielding materials for catering to the demand for smart and wearable electronic devices. Although several efforts have focused on constructing porous and flexible conductive films or aerogels, few studies have achieved a balance in terms of density, thickness, flexibility, and EMI shielding effectiveness (SE). Herein, an ultrathin, lightweight, and flexible carbon nanotube (CNT) buckypaper enhanced using MXenes (Ti3C2Tx) for high-performance EMI shielding is synthesized through a facile electrophoretic deposition process. The obtained Ti3C2Tx@CNT hybrid buckypaper exhibits an outstanding EMI SE of 60.5 dB in the X-band at 100 μm. The hybrid buckypaper with an MXene content of 49.4 wt% exhibits an EMI SE of 50.4 dB in the X-band with a thickness of only 15 μm, which is 105% higher than that of pristine CNT buckypaper. Furthermore, an average specific SE value of 5.7 × 104 dB cm2 g−1 is exhibited in the 5-μm hybrid buckypaper. Thus, this assembly process proves promising for the construction of ultrathin, flexible, and high-performance EMI shielding films for application in electronic devices and wireless communications.

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.

Integration of Carbon Nanotubes Into a Fiberglass Reinforced Polymer Composite and its Effects on Electromagnetic Shielding and Mechanical Properties

2013 ◽  
Author(s):  
Mehran Tehrani ◽  
Ayoub Y. Boroujeni ◽  
Majid Manteghi ◽  
Zhixian Zhou ◽  
Marwan Al-Haik
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Composite Materials ◽  
Electromagnetic Interference ◽  
Hybrid Composites ◽  
Fiber Surface ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electrically Conductive ◽  
Coated Fabric

Electromagnetic (EM) waves, such as electronic noise and radio frequency interference can be regarded as an invisible electronic pollution which justifies a very active quest for effective electromagnetic interference (EMI) shielding materials. Highly conductive materials of adequate thickness are the primary solutions to shield against EMI. Equipment cases and basic structure of space aircraft and launch vehicles have traditionally been made of aluminum, steel and other electrically conductive metals. However, in recent years composite materials have been used for electronic equipment manufacturing because of their lightweight, high strength, and ease of fabrication. Despite these benefits, composite materials are not as electrically conductive as traditional metals, especially in terms of electrical grounding purposes and shielding. Therefore, extra effort must be taken to resolve these shortcomings. The present work demonstrates a study on developing hybrid composites based on fiberglass with surface grown carbon nanotubes (CNTs) for EMI applications. The choice of fiberglass is primarily because it naturally possesses poor electrical conductivity, hence growing CNTs over glass fiber surface can significantly improve the conductivity. The fabrics were sputter-coated with a thin layer of SiO2 thermal barrier prior to growing of CNTs. The CNTs were grown on the surface of woven fiberglass fabrics utilizing a relatively low temperature technique. Raw fiberglass fabric, SiO2 coated fabric, and SiO2 coated fabric which was subjected to the identical heat treatment as the samples with CNTs were also prepared. Two-layers composite specimens based on different surface treated fiberglass fabrics were fabricated and their EMI shielding effectiveness (SE) was measured. The EMI SE of the hybrid CNT-fiberglass composites was shown to be 5–10 times of the reference samples. However, the tensile mechanical properties of the composites based on the different above mentioned fibers revealed significant degradation due to the elevated CNT growth temperature and the addition of coating layer and CNTs. To further probe the structure of the hybrid composites and the inter-connectivity of the CNTs from one interface to another, sets of 20-layers composites based on different surface treated fabrics were also fabricated and characterized.

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.

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.

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.

EMI Shielding Effectiveness of CNTs Composites

2013 ◽  
Vol 331 ◽  
pp. 439-442 ◽  
Author(s):  
Ping Li ◽  
Aik Seng Low ◽  
Yue Yan Shan ◽  
Guat Choon Ong ◽  
Xi Jiang Yin
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
Conductive Network ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
5 Ghz

A carbon nanotubes (CNTs) composite and its electromagnetic interference shielding effectiveness (SE) were investigated. Its absorptance, reflectance and shielding effectiveness (SE) were analysed. The CNTs composite has a shielding effectiveness (SE) of more than 25 dB (>99.68%) in frequency range from 30 MHz to 5 GHz. The testing results also demonstrate that the shielding mechanism of the CNTs composite is mainly EMI absorption of electromagnitic radiation. The high SE of the CNTs composite in the study is attributed to a high aspect ratio (>3000) and good conductive network of CNTs within the composite.

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