Microstructure and thermal conductivity of nano‑carbon/AlN composites

Technical lignin from pulping, an aromatic polymer with ~59% carbon content, was employed to develop novel lignin-based nano carbon thin film (LCF)-copper foil composite films for thermal management applications. A highly graphitized, nanoscale LCF (~80–100 nm in thickness) was successfully deposited on both sides of copper foil by spin coating followed by annealing treatment at 1000 °C in an argon atmosphere. The conditions of annealing significantly impacted the morphology and graphitization of LCF and the thermal conductivity of LCF-copper foil composite films. The LCF-modified copper foil exhibited an enhanced thermal conductivity of 478 W m−1 K−1 at 333 K, which was 43% higher than the copper foil counterpart. The enhanced thermal conductivity of the composite films compared with that of the copper foil was characterized by thermal infrared imaging. The thermal properties of the copper foil enhanced by LCF reveals its potential applications in the thermal management of advanced electronic products and highlights the potential high-value utility of lignin, the waste of pulping.

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Enhanced Functional Properties of Low-Density Polyethylene Nanocomposites Containing Hybrid Fillers of Multi-Walled Carbon Nanotubes and Nano Carbon Black

Polymers ◽

10.3390/polym12061356 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1356 ◽

Cited By ~ 2

Author(s):

Sandra Paszkiewicz ◽

Anna Szymczyk ◽

Agata Zubkiewicz ◽

Jan Subocz ◽

Rafal Stanik ◽

...

Keyword(s):

Thermal Conductivity ◽

Carbon Nanotubes ◽

Synergistic Effects ◽

Hybrid Nanocomposites ◽

Low Density Polyethylene ◽

Low Density ◽

Multi Walled Carbon Nanotubes ◽

Nano Carbon ◽

Carbon Nanofillers ◽

Walled Carbon Nanotubes

In this work, hybrid filler systems consisting of multi-walled carbon nanotubes (MWCNTs) and nano carbon black (nCB) were incorporated by melt mixing in low-density polyethylene (LDPE). To hybrid systems a mixture of MWCNTs and nCB a mass ratio of 1:1 and 3:1 were used. The purpose was to study if the synergistic effects can be achieved on tensile strength and electrical and thermal conductivity. The dispersion state of carbon nanofillers in the LDPE matrix has been evaluated with scanning electron microscopy. The melting and crystallization behavior of all nanocomposites was not significantly influenced by the nanofillers. It was found that the embedding of both types of carbon nanofillers into the LDPE matrix caused an increase in the value of Young’s modulus. The results of electrical and thermal conductivity were compared to LDPE nanocomposites containing only nCB or only MWCNTs presented in earlier work LDPE/MWCNTs. It was no synergistic effects of nCB in multi-walled CNTs and nCB hybrid nanocomposites regarding mechanical properties, electrical and thermal conductivity, and MWCNTs dispersion. Since LDPE/MWCNTs nanocomposites exhibit higher electrical conductivity than LDPE/MWCNTs + nCB or LDPE/nCB nanocomposites at the same nanofiller loading (wt.%), it confirms our earlier study that MWCNTs are a more efficient conductive nanofiller. The presence of MWCNTs and their concentration in hybrid nanocomposites was mainly responsible for the improvement of their thermal conductivity.

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THERMAL CONDUCTIVITY ENHANCEMENT OF PHASE CHANGE NANOCOMPOSITES IN SOLID AND LIQUID STATE WITH NANO CARBON INCLUSIONS

10.1615/ihtc16.tpm.023430 ◽

2018 ◽

Author(s):

Sivasankaran Harish ◽

Daniel Orejon ◽

Yasuyuki Takata ◽

Masamichi Kohno

Keyword(s):

Thermal Conductivity ◽

Phase Change ◽

Liquid State ◽

Thermal Conductivity Enhancement ◽

Conductivity Enhancement ◽

Nano Carbon

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Enhanced thermal conductivity for poly(vinylidene fluoride) composites with nano-carbon fillers

RSC Advances ◽

10.1039/c6ra11178e ◽

2016 ◽

Vol 6 (72) ◽

pp. 68357-68362 ◽

Cited By ~ 32

Author(s):

Yong Cao ◽

Minjie Liang ◽

Zhiduo Liu ◽

Yuming Wu ◽

Xiaoli Xiong ◽

...

Keyword(s):

Thermal Conductivity ◽

Vinylidene Fluoride ◽

Poly Vinylidene Fluoride ◽

Nano Carbon ◽

Carbon Fillers ◽

Enhanced Thermal Conductivity

The GS filler provides stronger enhancement of the thermal conductivity (up to 2.06 W m−1 K−1) in comparison with SF and CNTs, which is approximately 10-fold enhancement in comparison to that of the neat PVDF.

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