Great Thermal Conductivity Enhancement of Silicone Composite with Ultra-Long Copper Nanowires

Abstract

In this paper, ultra-long copper nanowires (CuNWs) were successfully synthesized at a large scale by hydrothermal reduction of divalent copper ion using oleylamine and oleic acid as dual ligands. The characteristic of CuNWs is hard and linear, which is clearly different from graphene nanoplatelets (GNPs) and multi-wall carbon nanotubes (MWCNTs). The thermal properties and models of silicone composites with three nanomaterials have been mainly researched. The maximum of thermal conductivity enhancement is up to 215% with only 1.0 vol.% CuNW loading, which is much higher than GNPs and MWCNTs. It is due to the ultra-long CuNWs with a length of more than 100 μm, which facilitates the formation of effective thermal-conductive networks, resulting in great enhancement of thermal conductivity.

Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles

“…The big length of the NWs together with their large aspect ratio facilitated the formation of effective thermal conductivity networks. 314 The simple and cost-effective bio-based synthesis of Cu NWs was reported by Pivot and co-workers. These researchers used an aqueous plant extract ( Eucalyptus globulus ) as the reducing/stabilizing agent and OAm/OAc as the surfactants.…”

One-Dimensional Metal Nanostructures: From Colloidal Syntheses to Applications

“…Common TIMs include thermal grease, solder, and particle-laden adhesive tapes . Metal NW-elastomer composites have also been evaluated for use as TIMs. ,− The ability of metal NWs to form percolating networks at low volume fractions means they can be added into an elastomer at volume fractions less than 2% and achieve the desired level of thermal conductivity. In contrast, spherical particles must be used at a volume fraction between 10–50%.…”

3D graphene/silver nanowire aerogel encapsulated phase change material with significantly enhanced thermal conductivity and excellent solar-thermal energy conversion capacity

“…To the best of our knowledge, high aspect ratio metal nanowires can significantly reduce scattering sites and offer continuous phonon transfer routes at the interfaces of supporting materials. 34 In addition, the nanowires interspersed between the aerogel pores can also act as a skeleton, 35 which can effectively prevent the collapse of the nanosheets.…”