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首页> 外文期刊>International Journal of Heat and Mass Transfer >Highly dispersed reduced graphene oxide and its hybrid complexes as effective additives for improving thermophysical property of heat transfer fluid
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Highly dispersed reduced graphene oxide and its hybrid complexes as effective additives for improving thermophysical property of heat transfer fluid

机译：高度分散的还原氧化石墨烯及其杂化配合物，作为改善传热流体热物理性质的有效添加剂

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The present research reported on the benign and facile preparation of highly stable reduced graphene oxide (RGO) and its role on enhancing the thermophysical properties of heat transfer liquid. Graphene oxide (GO) was prepared via chemical exfoliation route and subsequently reduced using tannic acid (TA) which served as natural based environmentally benign reducing agent. Further, a meticulous amount of different high purity carbon sources (i.e. multiwall carbon nanotube (MWCNT), carbon nano-fiber (CNF) and graphene nanoplatelets (GnP)) was introduced to the RGO sheets aiming to extend the limits of its physicochemical properties for diverse applications. Results obtained led to the fact that GO was successfully reduced based on the material characterization evidences. Moreover, the addition of highly conjugated carbon structures on RGO has proven to be pivotal in promoting highly efficient thermal transport with minimal penalty on viscosity increment. It was believed that, similar to the previously documented electrical conductivity enhancement, the rise in thermal property was attributed to the modified structural network of RGO originating from the addition of different carbon allotropes which overlaid series of conducting paths for efficient phonon transport both in lateral and out of plane modes. As high as 25% increase in thermal conductivity was recorded with RGO-CNT complexes in comparison to base fluid (i.e. DI water) while a modest 4% rise in viscosity was proven to be insignificant It was suggested from the results that morphological structure of the carbon based additives may play significant roles in different degree of enhancement of the hybrid materials.
机译：本研究报道了高度稳定的还原型氧化石墨烯（RGO）的良性制备及其在增强传热液体热物理性质方面的作用。氧化石墨烯（GO）是通过化学剥离法制备的，随后使用单宁酸（TA）进行还原，而单宁酸（TA）则是天然的环境友好型还原剂。此外，将一定量的不同高纯度碳源（即多壁碳纳米管（MWCNT），碳纳米纤维（CNF）和石墨烯纳米片（GnP））引入RGO片，旨在扩展其理化性能的极限。多样化的应用。获得的结果导致基于材料表征证据成功还原了GO的事实。此外，事实证明，在RGO上添加高度共轭的碳结构对于促进高效的热传输以及对粘度增加的影响最小是至关重要的。可以相信，与先前记录的电导率增强类似，热性能的提高归因于RGO的结构化网络的改进，该网络源自添加了不同的碳同素异形体，这些碳同素异形体覆盖了一系列传导路径，可在侧向和垂直方向有效地传输声子。平面外模式。与基础流体（即去离子水）相比，RGO-CNT配合物记录的热导率最高可提高25％，而粘度仅适度提高4％被证明是微不足道的。碳基添加剂可能在杂化材料不同程度的增强中起重要作用。

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