Chemical assembling of amine functionalized boron nitride nanotubes onto polymeric nanofiber film for improving their thermal conductivity

This work summarizes the recent progress on the thermal transport properties of 3D nanostructures, with an emphasis on experimental results. Depending on the applications, different 3D nanostructures can be prepared or designed to either achieve a low thermal conductivity for thermal insulation or thermoelectric devices or a high thermal conductivity for thermal interface materials used in the continuing miniaturization of electronics. A broad range of 3D nanostructures are discussed, ranging from colloidal crystals/assemblies, array structures, holey structures, hierarchical structures, to 3D nanostructured fillers for metal matrix composites and polymer composites. Different factors that impact the thermal conductivity of these 3D structures are compared and analyzed. This work provides an overall understanding of the thermal transport properties of various 3D nanostructures, which will shed light on the thermal management at nanoscale.

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“…), polyacrylic acid (PAA)/polyvinyl alcohol (PVA) polymers (PAA/PVA, 2, ref. ), CNF (3, ref. , 4, ref.…”

Section: Polymer Composites With Nanostructured Fillers For High Thermentioning

confidence: 99%

Thermal Transport in 3D Nanostructures

Zhan

Nie

Chen

et al. 2019

Adv Funct Materials

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“…23−26 However, almost all of the methods mentioned above introduce hydroxyl groups at the B atom position or bond with hydroxyl groups. To our best knowledge, few methods can directly introduce amino groups on h-BN in the existing literature, 27 and almost all amino groups are derived from other additional substances. For example, using NH 3 plasma 28,29 or ball milling h-BN with urea can achieve that, 30 but both of these methods requires special equipment and ball milling may destroy the large-sized h-BN structure with better thermal conductivity.…”

Section: ■ Introductionmentioning

confidence: 99%

Thionyl Chloride Corrodes Hexagonal Boron Nitride to Generate Reactive Functional Groups

2021

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Two-dimensional hexagonal boron nitride (h-BN) has received much attention owing to its unique properties and wide range of applications. However, the lack of sufficient active functional groups on the surface coupled with the extremely stable structure restricts the wide application of h-BN. We find that thionyl chloride can corrode commercially available h-BN and generate many through-holes in the thickness direction. Both X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT-IR) show that the corroded h-BN contains reactive hydroxyl and a lot of amino groups. The corrosion mechanism is proposed and we conclude that H+ and OH– will affect the defect structure of the corroded h-BN by affecting the generation of boric acid. The thionyl chloride corroded h-BN could improve the thermal conductivity and DC breakdown strength of the composites because of the improved interface. This novel method about corroding h-BN through thionyl chloride is promising for the modification research of h-BN due to its simplicity and efficiency.

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“…Kim and coworkers investigated both physical and chemical assembly of amine-functionalized BNNTs onto electrospun polyacrylic acid/polyvinyl alcohol nanofibers for enhancing the thermal conductivity ( Kim et al., 2018 ). With the chemical assembly of 1 wt % BNNTs, the thermal conductivity and thermal diffusivity, respectively, increased to 0.65 W m −1 K −1 and 9.01 10 −7 m 2 s −1 , which are 1.5-fold to that of neat PAA/PVA nanofibers due to the covalent bonding, whereas physical assembly only showed a negligible improvement.…”

Section: Techniques Used For Improving Thermal Conductivitymentioning

confidence: 99%