Characterisation of graphite nanoplatelets and the physical properties of graphite nanoplatelet/silicone composites for thermal interface applications

Raza, Mohsin Ali; Westwood, Aidan; Brown, Andy; Hondow, Nicole; Stirling, Chris

doi:10.1016/j.carbon.2011.06.002

Cited by 113 publications

(56 citation statements)

References 29 publications

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“…Silicone elastomer was also used as matrix to produce pastes and adhesives. The details of the fabrication and properties of these composites can be found elsewhere [15,16]. Briefly, appropriate amount of GNPs were mixed in rubbery epoxy resin or glassy epoxy resin by using conventional mechanical mixer with a high speed motor and a propeller attached to a shaft which was rotated at 2500 rpm for 20 min to make composite dispersions.…”

Section: Methodsmentioning

confidence: 99%

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

2015

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Graphite nanoplatelets (GNP), carbon black (CB) and carbon nanotubes are extensively researched to produce thermal interface materials (TIMs). This work reports comparison of interfacial thermal conductance (ITC) of carbon nanofiller-based polymer composite adhesives and pastes. The results show that total thermal contact resistance (TTCR) of GNP/rubbery epoxy composite was the same as that of an equivalent glassy epoxy composite. Although CB-based rubbery epoxy and silicone composites can be applied as thin bondlines, their TTCRs were significantly higher than GNP/rubbery epoxy. GNPs incorporation into CB/rubbery epoxy composite improves the ITC of the CB/rubbery epoxy composites but the performance of CB/GNP/rubbery epoxy was inferior to GNP/rubbery epoxy. The thermal paste of GNP/polyetheramine had TTCR of 4.8 × 10 -6 m 2 .K/W which is comparable to commercial TIMpaste. The paste produced with silicone had relatively poor ITC versus that prepared with polyetheramine. The paste having smaller particle sized GNPs offers lower TTCR than that prepared with large sized GNPs. The GNP/rubbery epoxy adhesives produced from precursor pastes gave the lowest TTCRs in comparison with the other adhesives. This study suggests that GNPs offer potential for enhancing ITC of TIMs and that ITC of adhesives depends on fillers' thermal conductivity and their interfacial contact with substrates.

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Section: Methodsmentioning

confidence: 99%

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

2015

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“…2). Although electrically conductive property can be tolerated in some fields, electrical conductivity is generally undesired for TIMs [6]. As presented in Fig.…”

Section: Resultsmentioning

confidence: 95%

“…Carbon-based materials and metallic fillers such as graphite [5], graphite/graphene nanoplateles (GNPs) [6,7], graphene [8], carbon nanotubes (CNTs) [9], carbon fiber [10,11], silver particles, silver nanowires [12], and copper nanowires [2,13] have been widely utilized to fabricate polymer-based TIMs owing to their extraordinary inherent thermal conductivity [14,15]. However, the incorporation of electrically conductive fillers will inevitably cause the great deterioration of electrical insulation performance, which hinders the wide use of these TIMs in next-generation microelectronics devices [16,17] such as LED devices with chips directly placing on the heat sink, single chip packages [18], and high-voltage devices.…”

Section: Introductionmentioning

confidence: 99%

Electrically insulating POE/BN elastomeric composites with high through-plane thermal conductivity fabricated by two-roll milling and hot compression

Feng

Bai

Bao

et al. 2017

Adv Compos Hybrid Mater

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In this work, we reported a kind of electrical insulating, highly through-plane thermally conductive polyolefin elastomer (POE)-based composites filled with commercial boron nitride (BN) fabricated by a conventional melt-mixing method of two-roll milling, followed by hot compression and mechanical cutting. The as-fabricated composites with BN flakes perfectly aligning vertically in the matrix revealed high through-plane thermal conductivity (6.94 W m −1 K −1 at a BN content of 43.75 vol%), outstanding electrical insulation (4.34× Ω cm at a BN content of 43.75 vol%), and quite good mechanical properties. This fabrication procedure features facile process, industrial equipment, and easy industrialization, and the as-prepared composites with outstanding comprehensive performance are promising for thermal interface materials (TIMs) application.

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“…For each iteration, the condition for which the thicknesses of the second phase remained congruent to those of the previous and following stages (~13 lm) corresponded to have thermal conductivity values of the GNP of about 4.85 W/mK, therefore very similar to those experienced by nano-graphites respect to a heat flow normal to the planes [42]. On the other hand, possible applications of the GNP conductivity similar to those shown along its plane (~1500-2000 W/mK) did not allow arriving at convergence.…”

Section: Gnp Planes Dispositionmentioning

confidence: 89%

Thermal and mechanical improvement of aluminum open-cells foams through electrodeposition of copper and graphene

2016

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-Thanks to its planar structure, graphene is characterized by unique properties, such as excellent chemical inactivity, high electrical and thermal conductivity, high optical transparency, extraordinary flexibility and high mechanical resistance, which make it suitable in a very wide range of applications. This paper details the state of the art in graphene coating applied to aluminum open-cells foams for the improvement of their mechanical and thermal behavior. Metallic foams are highly porous materials with extremely high convective heat transfer coefficients, thanks to their complex structure of three-dimensional open-cells. Graphene nanoplatelets have been used to improve thermal conductivity of aluminum foams, to make them better suitable during heat transfer in transient state. Also, an improvement of mechanical resistance has been observed. Before electrodeposition, all the samples have been subjected to sandblasting process, to eliminate the oxide layer on the surface, enabling a better adhesion of the coating. Different nanoparticles of graphene have been used. The experimental findings revealed a higher thermal conductivity for aluminum open cells foams electroplated with graphene. Considered the relatively low process costs and the improvements obtainable, these materials are very promising in many technological fields. The topics covered include surface modification, electrochemical plating, thermo-graphic analysis.

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Characterisation of graphite nanoplatelets and the physical properties of graphite nanoplatelet/silicone composites for thermal interface applications

Cited by 113 publications

References 29 publications

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

Comparison of carbon nanofiller-based polymer composite adhesives and pastes for thermal interface applications

Electrically insulating POE/BN elastomeric composites with high through-plane thermal conductivity fabricated by two-roll milling and hot compression

Thermal and mechanical improvement of aluminum open-cells foams through electrodeposition of copper and graphene

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