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Application of hybrid sphere/carbon nanotube particles in nanofluids

机译：球形/碳纳米管混合颗粒在纳米流体中的应用

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摘要

Previous studies on nanofluids have focused on spherical or long-fibre particles. In this work, a new type of complex nanoparticle-a hybrid sphere/carbon nanotube(CNT) particle, consisting of numerous CNTs attached to an alumina/iron oxide sphere-is proposed for applications in nanofluids. In such hybrid nanoparticles, heat is expected to transport rapidly from one CNT to another through the centre sphere and thus leading to less thermal contact resistance between CNTs when compared to simple CNTs dispersed in fluids. CNTs have an extremely high thermal conductivity, but thermal resistance between the CNTs and the fluid has limited their performance in nanofluids. The proposed hybrid sphere/CNT particles are synthesized by spray pyrolysis followed by catalytic growth of CNTs. The spheres are about 70 nm in diameter on average, and the attached CNTs have a length up to 2 mu m. These hybrid nanoparticles are dispersed to poly-alpha-olefin with sonication and a small amount of surfactants to form stable nanofluids. The thermal conductivity of the fluids has been measured by a 3 omega-wire method over a temperature range 10-90 deg C. The results indicate that the effective thermal conductivity of the fluids is increased by about 21 percent at room temperature for particle volume fractions of 0.2 percent.
机译：先前对纳米流体的研究集中在球形或长纤维颗粒上。在这项工作中，提出了一种新型的复合纳米颗粒-一种混合球/碳纳米管（CNT）颗粒，它由附着在氧化铝/氧化铁球上的许多CNT组成-用于纳米流体。在这种杂化纳米颗粒中，与分散在流体中的简单CNT相比，预计热量会通过中心球从一种CNT快速传递到另一种，从而导致CNT之间的热接触电阻减小。 CNT具有极高的导热率，但是CNT与流体之间的热阻限制了它们在纳米流体中的性能。提出的混合球体/ CNT颗粒是通过喷雾热解，然后催化生长CNT合成的。这些球的平均直径约为70 nm，连接的CNT的长度最大为2μm。这些杂化的纳米颗粒通过超声处理和少量表面活性剂分散到聚α-烯烃中，形成稳定的纳米流体。通过3Ω线法在10-90摄氏度的温度范围内测量了流体的热导率。结​​果表明，在室温下，对于颗粒体积分数，流体的有效热导率提高了约21％。为0.2％。

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