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Plasma nanocoated carbon nanotubes for heat transfer nanofluids

机译：等离子纳米涂层碳纳米管用于传热纳米流体

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摘要

Multi-wall carbon nanotubes (CNTs) were plasma-treated using glow discharges of argon, oxygen and methane/oxygen mixtures and then dispersed into a base fluid of water. It was found that proper plasma treatments of CNTs using nanoscale plasma coatings significantly improve the dispersion and stabilize the suspension of CNTs in the base fluid. With 0.01vol% addition of plasma-treated CNTs, a 25% initial increase in thermal conductivity was achieved and a stabilized 20% increase was observed with the resulting nanofluids after 5 days' settling. It should particularly be pointed out that such a large increase in thermal conductivity was achieved when plasma-treated CNTs were stably dispersed in water without adding any dispersing agents or surfactants. Surface modification of the CNTs was confirmed by Raman spectroscopy and ultra-thin (～2nm) plasma nanocoatings were noted on the treated CNT surfaces by transmission electron microscopy (TEM).
机译：使用氩气，氧气和甲烷/氧气混合物的辉光放电对多壁碳纳米管（CNT）进行等离子体处理，然后将其分散到水的基液中。发现使用纳米级等离子体涂层对CNT进行适当的等离子体处理显着改善了分散并稳定了CNT在基础流体中的悬浮液。通过添加0.01vol％的经等离子体处理的CNT，初始热导率增加了25％，并且在沉降5天后观察到所得纳米流体稳定地增加了20％。特别要指出的是，当将经等离子体处理的CNT稳定地分散在水中而不添加任何分散剂或表面活性剂时，可以实现如此大的导热率提高。碳纳米管的表面改性通过拉曼光谱法得到证实，并通过透射电子显微镜（TEM）在处理过的碳纳米管表面发现了超薄（〜2nm）的等离子体纳米涂层。

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