High thermal conductivity of polyethylene nanowire arrays fabricated by an improved nanoporous template wetting technique

Cao, Bing‐Yang; Li, Yuan Wei; Kong, Jie; Chen, Heng; Xu, Yan; Yung, Kai Leung; An, Chongwei

doi:10.1016/j.polymer.2011.02.019

Cited by 98 publications

(68 citation statements)

References 40 publications

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“…These "hotspots" of the electronic device should be specially cooled down in thermal management [2]. Some nanomaterials have the potential to resolve this problem [4,5], wherein the carbon nanotube (CNT) and graphene are found to be the most promising materials due to their super high thermal conductivities [6][7][8]. For example, few-layer graphene has a high thermal conductivity of more than 2,000 Wm −1 K −1 and has been successfully used to spread heat from highpower GaN transistors [9].…”

Section: Thermal Transport Across the Interface Between A Suspended Smentioning

confidence: 99%

Thermal Transport Across the Interface Between a Suspended Single-Walled Carbon Nanotube and Air

Wang¹,

Liu²,

Guo³

et al. 2013

Nanoscale and Microscale Thermophysical Engineering

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The heat transfer coefficients of several individual single-walled carbon nanotubes (SWCNTs) were measured using a micro-Raman spectroscopy technique in an atmosphere environment. A 514 nm laser was focused in the middle of a suspended SWCNT and the local temperature rise was measured by monitoring the downshifts of the G-band frequency. The heat transfer coefficient can be extracted from the measured midpoint temperature rise. Because there are no temperature drops at the ends of SWCNTs, the thermal contact resistance can be ignored. A detailed kinetic model was developed to predict the heat transfer coefficient quantitatively from the free molecular regime to the continuum regime. The theoretical prediction agrees well with the experimental data. Based on the present model, a maximum heat transfer coefficient occurs in the transition regime at a diameter of several nanometers, which is the competition result of the thermal resistances of the noncontinuum layer and continuum layer. The maximum value agrees with the prediction of kinetic theory of gases. The noncontact Raman measurement technique and prediction model will benefit the thermal design of carbon nanotube-based heat spreaders.

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Section: Thermal Transport Across the Interface Between A Suspended Smentioning

confidence: 99%

Thermal Transport Across the Interface Between a Suspended Single-Walled Carbon Nanotube and Air

Wang¹,

Liu²,

Guo³

et al. 2013

Nanoscale and Microscale Thermophysical Engineering

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“…What's more, the nanostructures fabricated by nanomoulding present many good properties. The thermal conductivities of the fabricated polymer nanowire arrays are found to be about 2 orders of magnitude higher than their bulk counterparts [14,15]. With the arrangement of the micro-and nanostructures on the surface the superhydrophobicity of polymers has been obtained [16,17].…”

Section: Introductionmentioning

confidence: 96%

Flows of Polymer Melts through Nanopores: Experiments and Modelling

Cao

2013

JTST

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The polymer melts flow behaviors through nanopores are investigated by using the nanoporous template wetting technique in our study. The experimental observation indicates that the meniscus rises according to a (time)1/2 law which agrees with the Lucas-Washburn law. Comparing the experimental results with the Lucas-Washburn equation, we also demonstrate that the viscosities of polymer melts decrease in their flows through nanopores and the induced rheological behavior is caused by the nanoconfinement of nanopores.

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“…In the present paper, two hours of infiltration may prepare us nanowire arrays with about 50 µm in thickness. Moreover, the vibration does help the polymer chains to be more oriented due to the oscillatory shear rates (23,24) so that the present polymer nanowire arrays also have very high thermal conductivity (more than 10 W/mK) (25) . Fourth, the sample is cooled down to ambient temperature.…”

Section: Fabrication Of Nanowire Arraysmentioning

confidence: 95%

Superhydrophobicity of Self-Organized Surfaces of Polymer Nanowire Arrays Fabricated by a Nano-Injection Moulding Technique

Cao

Dong

et al. 2011

JTST

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We report on the superhydrophobicity of self-organized surfaces of polyethylene (PE) nanowire arrays that are fabricated by a nano-injection moulding technique. The highly-aligned PE nanofibers with high aspect ratio are formed after the infiltration of polymer melts into the alumina nanopores by wetting action and fluid vibrational perturbation. The self-organized surfaces of polymer nanowire arrays are found to have micro-to-nanoscale hierarchical nanostructures, and have superhydrophobicity of >150° contact angles. The present superhydrophobic surfaces may be quite promising due to its simple but massive production with high quality.

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High thermal conductivity of polyethylene nanowire arrays fabricated by an improved nanoporous template wetting technique

Cited by 98 publications

References 40 publications

Thermal Transport Across the Interface Between a Suspended Single-Walled Carbon Nanotube and Air

Thermal Transport Across the Interface Between a Suspended Single-Walled Carbon Nanotube and Air

Flows of Polymer Melts through Nanopores: Experiments and Modelling

Superhydrophobicity of Self-Organized Surfaces of Polymer Nanowire Arrays Fabricated by a Nano-Injection Moulding Technique

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