scholarly journals Thermal Conductivity and Electromagnetic Interference (EMI) Absorbing Properties of Composite Sheets Composed of Dry Processed Core–Shell Structured Fillers and Silicone Polymers

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2318
Author(s):  
Hyun-Seok Choi ◽  
Ji-Won Park ◽  
Kyung-Sub Lee ◽  
Sang-Woo Kim ◽  
Su-Jeong Suh
Keyword(s):  
Thermal Conductivity ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Dielectric Breakdown ◽  
Filler Loading ◽  
Close Packing ◽  
Core Shell ◽  
Dry Process ◽  
Dual Functional ◽  
High Dielectric

This paper proposes dual-functional sheets (DFSs) that simultaneously have high thermal conductivity (TC) and electromagnetic interference (EMI) absorbing properties, making them suitable for use in mobile electronics. By adopting a simple but highly efficient dry process for manufacturing core–shell structured fillers (CSSFs) and formulating a close-packed filler composition, the DFSs show high performance, TC of 5.1 W m−1 K−1, and a −4 dB inter-decoupling ratio (IDR) at a 1 GHz frequency. Especially, the DFSs show a high dielectric breakdown voltage (BDV) of 3 kV mm−1, which is beneficial for application in most electronic devices. The DFSs consist of two kinds of CSSFs that are blended in accordance with the close-packing rule, Horsfield’s packing model, and with polydimethylsiloxane (PDMS) polymers. The core materials are soft magnetic Fe-12.5%Cr and Fe-6.5%Si alloy powders of different sizes, and Al2O3 ceramic powders of a 1-μm diameter are used as the shell material. The high performance of the DFS is supposed to originate from the thick and stable shell layer and the maximized filler loading capability owing to the close-packed structure.

scholarly journals Decoupling electron and phonon transport in single-nanowire hybrid materials for high-performance thermoelectrics

2021 ◽  
Vol 7 (20) ◽  
pp. eabe6000
Author(s):  
Lin Yang ◽  
Madeleine P. Gordon ◽  
Akanksha K. Menon ◽  
Alexandra Bruefach ◽  
Kyle Haas ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Transport ◽  
Electrical Transport ◽  
High Performance ◽  
Figure Of Merit ◽  
Phonon Transport ◽  
Core Shell ◽  
Nanowire Diameter ◽  
High Performing ◽  
Polycrystalline Thin Films

Organic-inorganic hybrids have recently emerged as a class of high-performing thermoelectric materials that are lightweight and mechanically flexible. However, the fundamental electrical and thermal transport in these materials has remained elusive due to the heterogeneity of bulk, polycrystalline, thin films reported thus far. Here, we systematically investigate a model hybrid comprising a single core/shell nanowire of Te-PEDOT:PSS. We show that as the nanowire diameter is reduced, the electrical conductivity increases and the thermal conductivity decreases, while the Seebeck coefficient remains nearly constant—this collectively results in a figure of merit, ZT, of 0.54 at 400 K. The origin of the decoupling of charge and heat transport lies in the fact that electrical transport occurs through the organic shell, while thermal transport is driven by the inorganic core. This study establishes design principles for high-performing thermoelectrics that leverage the unique interactions occurring at the interfaces of hybrid nanowires.

Polyaniline-grafted hydrolysed polyethylene as a dual functional interlayer/separator for high-performance Li–S@C core–shell batteries

2019 ◽  
Vol 55 (95) ◽  
pp. 14263-14266 ◽  
Author(s):  
Suchakree Tubtimkuna ◽  
Atiweena Krittayavathananon ◽  
Poramane Chiochan ◽  
Salatan Duangdangchote ◽  
Juthaporn Wutthiprom ◽  
...  
Keyword(s):  
High Performance ◽  
Core Shell ◽  
Dual Functional

A modified hydrolysed polyethylene with polyaniline was used as a dual functional interlayer/separator for high-performance lithium–sulphur batteries (LSBs) to reduce the migration of soluble polysulphide intermediates.

scholarly journals Excellent Thermally Conducting Ni Plating Graphite Nanoplatelets/Poly(phenylene sulfone) Composites for High-Performance Electromagnetic Interference Shielding Effectiveness

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3493
Author(s):  
Zhang Chen ◽  
Ting Yang ◽  
Lin Cheng ◽  
Jianxin Mu
Keyword(s):  
Thermal Conductivity ◽  
Heat Conduction ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Graphite Nanoplatelets ◽  
Pressing Method ◽  
Blending Method ◽  
Thermally Conducting

First, nickel particles were deposited on the surface of graphite nanoplatelets to fabricate highly conductive GnPs@Ni core-shell structure hybrid fillers via electroplating. The modified GnPs were blended with polyphenylene sulfone via the solution blending method, followed by the hot-pressing method to achieve high thermally conducting GnPs@Ni/PPSU composites for high performance electromagnetic interference effectiveness. The results showed that in-plane and through-plane thermal conductivity of the composite at the 40 wt% filler loading could reach 2.6 Wm−1K−1 and 3.7 Wm−1K−1, respectively, which were 9.4 and 20 times higher than that of pure PPSU resin. The orientation degree of fillers was discussed by XRD and SEM. Then, heat conduction data were fitted and analyzed by the Agari model, and the heat conduction mechanism was further explored. The testing results also demonstrated that the material exhibited good conductivity, electromagnetic shielding effectiveness and superior thermal stability. Overall, the GnPs@Ni/PPSU composites had high thermal conductivity and were effective electromagnetic shielding materials at high temperatures.

FeSiAl/metal core shell hybrid composite with high-performance electromagnetic interference shielding

2019 ◽  
Vol 172 ◽  
pp. 66-73 ◽  
Author(s):  
Pradeep Sambyal ◽  
Seok Jin Noh ◽  
Jun Pyo Hong ◽  
Woo Nyon Kim ◽  
Aamir Iqbal ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Hybrid Composite ◽  
High Performance ◽  
Core Shell ◽  
Electromagnetic Interference Shielding ◽  
Metal Core

Enhancing dielectric and mechanical properties of poly(arylene ether nitrile) based composites by introducing low content “core-shell” like structured MXene&PDA@ BaTiO3

2021 ◽  
pp. 095400832110149
Author(s):  
Weixi Zhang ◽  
Yuan Kai ◽  
Jian Lin ◽  
Yumin Huang ◽  
Xiaobo Liu
Keyword(s):  
Dielectric Properties ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Composite Films ◽  
Dielectric Materials ◽  
Nanocomposite Films ◽  
Core Shell ◽  
Low Dielectric ◽  
The Fourier Transform ◽  
High Dielectric

Polyarylene ether nitrile (PEN) based composites combined MXene, Polydopamine (PDA) and barium titanate (BaTiO3, BT) with “core-shell”-like structure were developed successfully in this work, and then incorporating into the PEN matrix to form the PEN/MXene&PDA@BT nanocomposite films through the solution casting method. The novel MXene&PDA@BT nanoparticles were characterized by the Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Then the structure and properties of the obtained PEN/MXene&PDA@BT nanocomposites are studied in detail. The results show that the modification of PDA improved the dispersibility of MXene nanosheets and BT nanoparticles in the PEN matrix, resulting in the enhancement of mechanical and dielectric properties. The research results reveal that when the content of MXene&PDA@BT is 1%, the tensile strength and modulus reached 114.15 MPa and 3015.74 MPa, respectively. Most important, the PEN based nanocomposites exhibit the outstanding frequency in dependent dielectric properties, including high dielectric constant (5.08 at 1 kHz) and low dielectric loss (0.0178 at 1 kHz). These results indicate that the PEN/MXene&PDA@BT composite films are greatly significant for using as the constructing high performance dielectric materials.

High performance epoxy nanocomposites with enhanced thermal and mechanical properties by incorporating amine-terminated oligoimide-grafted graphene oxide

2019 ◽  
Vol 32 (5) ◽  
pp. 569-587
Author(s):  
Muhammad Inshad Khan ◽  
Humaira Masood Siddiqi ◽  
Chan Ho Park ◽  
Junghun Han ◽  
Hyeonjung Park ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Elastic Modulus ◽  
Epoxy Resin ◽  
High Performance ◽  
Filler Loading ◽  
Elastic Behavior ◽  
Epoxy Nanocomposites ◽  
Modified Graphene Oxide ◽  
Hardness Values

In this work, thermal conductivity and mechanical strength of a commercial epoxy resin were improved by incorporating an amine-terminated oligoimide modified graphene oxide (ATO-GO). For this purpose, the surface of GO was modified with flexible/stable imide backbone and amine terminals. The ATO-GO was incorporated in epoxy proportion to prepare series of nanocomposites. The terminal amino group of ATO-GO also acted as curing moiety for epoxy resin leading to good interfacial compatibility and dispersion in the epoxy matrix resulting in improved properties. The epoxy resin was cured with hardener Aradur-22962 and ATO-GO separately and the results of curing behavior were compared with each other, which clearly showed the curing action of ATO-GO. In the prepared ATO-GO-epoxy nanocomposites, the filler enhanced the thermal conductivity, hardness and elastic modulus without decrease in thermal stability even at higher filler loading. In previous studies, it is reported that at higher GO, filler-loading properties like elastic modulus, hardness values, and glass transition temperature ( T g) were decreased. An enhancement of 59.5% in thermal conductivity was achieved for 5 wt% loading of ATO-GO filler as compared to neat epoxy. Along with this, thermal analysis revealed that the nanocomposites with 5 wt% filler loading have high T g and thermal strength. Nanoindentation results revealed that elastic modulus and hardness values enhanced by 104% and 147%, respectively, for the same nanocomposites. The enhanced thermal conductivity and good elastic behavior of the ATO-GO-epoxy nanocomposites demonstrated that these can be used as high-performance materials in electronic packing and electronic devices.

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