High thermal conductivity and superhydrophobicity are highly desired for micro/nanofluidic devices. Good thermal conductivity is helpful for thermal control and managements. Superhydrophobicity can benefit fluid friction reduction and liquid droplet control. We report on an improved nano-moulding technique which can prepare polymer (high density polyethylene/HDPE) nanowire arrays with high thermal conductivity (more than 10W/mK) and superhydrophobicity (contact angle >150°). The thermal conductivities of the fabricated high-density polyethylene (HDPE) nanowire arrays with diameters of 100 nm and 200 nm, measured by a laser flash method, are about 2 orders of magnitude higher than their bulk counterparts. The estimated thermal conductivity of a single HDPE nanowire is as high as 26.5 W/mK at room temperature. The self-organized surfaces of polymer nanowire arrays are found to have micro-to-nanoscale hierarchical nanostructures, and have superhydrophobicity of >150° contact angles. This technique is promising for fabrication of micro/nanofluidics devices due to the advantages of simple fabrication, high-quality, low-cost, and mass-production.
- Heat Transfer Division
Polymer Nanowire Arrays With High Thermal Conductivity and Superhydrophobicity Fabricated by a Nano-Moulding Technique
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Cao, B, Kong, J, Xu, Y, Yung, K, & Cai, A. "Polymer Nanowire Arrays With High Thermal Conductivity and Superhydrophobicity Fabricated by a Nano-Moulding Technique." Proceedings of the ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 2. Edmonton, Alberta, Canada. June 19–22, 2011. pp. 489-495. ASME. https://doi.org/10.1115/ICNMM2011-58281
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