Magnetic field-induced alignment of nickel-coated copper nanowires in epoxy composites for highly thermal conductivity with low filler loading

In this work, the large-scale produced copper nanowires (Cu NWs) were coated by nickel nanoparticles (Ni NPs) lay, i.e., Cu NWs@Ni. And under external magnetic field condition, Cu NWs@Ni as thermally conductive fillers were filled into epoxy (EP) resin to prepare the composites with high thermal con...

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Bibliographic Details
Published in:Composites science and technology 2022-02, Vol.218, p.109137, Article 109137
Main Authors: Wang, Zhe, Gao, Chuanping, Zhang, Shengmao, Zhang, Pingyu, Zhang, Zhijun
Format: Article
Language:English
Subjects:
Composite materials
Copper
Cu NWs@Ni
Dielectric strength
Epoxy-based composites
Fillers
Heat conductivity
Heat transfer
Low filler loading
Magnetic field
Magnetic fields
Magnetic saturation
Mechanical properties
Nanoparticles
Nanowires
Nickel
Resins
Thermal conductivity
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Summary:In this work, the large-scale produced copper nanowires (Cu NWs) were coated by nickel nanoparticles (Ni NPs) lay, i.e., Cu NWs@Ni. And under external magnetic field condition, Cu NWs@Ni as thermally conductive fillers were filled into epoxy (EP) resin to prepare the composites with high thermal conductivity (TC). The results showed that, when the magnetic field was 80 mT, Cu NWs@Ni (molar ratio of Cu:Ni = 10:5, and saturation magnetization (Ms) = 20.3 emu/g) can distribute in EP resin in an orderly manner along the direction of the magnetic field, endowing the composite with excellent TC at lower loading. Especially, when only 9 vol% Cu NWs@Ni was filled, the TC along the direction of the magnetic field can reach 2.90 W/mK, which was 12.81 times than that of neat EP resin. Even so, the composite still maintained outstanding insulation properties, namely, the volume resistivity and the dielectric strength were 1.79 × 1015 Ω cm and 12.88 kV/mm, respectively. In addition, compared to that of neat EP resin, the composite still possessed splendid heat stability and mechanical properties. For the above positive improvement, the corresponding mechanisms were also discussed in detail. [Display omitted] •The large-scale produced Cu NWs coated by Ni lay were utilized as thermally conductive filler.•EP/Cu NWs@Ni(⊥) composites were prepared under an external magnetic field condition.•The thermal conductivity of 9.0 vol% EP/Cu NWs@Ni(⊥) reached to 2.90 W/mK.•EP/Cu NWs@Ni(⊥) composites can maintain excellent insulation properties.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2021.109137