Synthesis and thermo-physical properties of deep eutectic solvent-based graphene nanofluids
Synthesis and thermo-physical properties of deep eutectic solvent-based graphene nanofluids
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DOI：
10.1088/0957-4484/27/7/075702
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发表时间：
2016-02-09
期刊：
影响因子：
3.5
通讯作者：
Farid, M. M.
中科院分区：
文献类型：
--
作者：
Fang, Y. K.;Osama, M.;Farid, M. M.
本研究介绍了一类新的传热流体分散功能化的氧化石墨烯纳米颗粒（GNP）在铵和磷基深共熔溶剂（DES）没有表面活性剂的帮助。采用不同摩尔比的盐和氢键供体（HBD）合成DES，用于制备不同浓度的石墨烯纳米流体（GNF）。GNP的浓度为0.01重量%、0.02重量%和0.05重量%。通过高速均质化和超声处理过程获得均匀且稳定的纳米流体悬浮液。除了ζ电位研究之外，通过目视观察4周，然后离心过程（5000-20000 rpm）30分钟来确定GNF的稳定性。使用光学显微镜观察GNP在DES中的分散。合成的基于DES的GNF显示在纳米流体中没有颗粒团聚和沉积物的形成。研究了纳米流体的导热系数和比热等热物理性质。观察到最高的热导率提高了177%。这项研究的结果提供了一种新的工程流体传热应用的温度，类型和组成DES以及GNP浓度的函数。
This study introduces a new class of heat transfer fluids by dispersing functionalised graphene oxide nanoparticles (GNPs) in ammonium and phosphonium-based deep eutectic solvents (DESs) without the aid of a surfactant. Different molar ratios of salts and hydrogen bond donors (HBD) were used to synthesise DESs for the preparation of different concentrations of graphene nanofluids (GNFs). The concentrations of GNPs were 0.01 wt%, 0.02 wt% and 0.05 wt %. Homogeneous and stable suspensions of nanofluids were obtained by high speed homogenisation and an ultrasonication process. The stability of the GNFs was determined through visual observation for 4 weeks followed by a centrifugal process (5000-20000 rpm) for 30 min in addition to zeta potential studies. Dispersion of the GNPs in DES was observed using an optical microscope. The synthesised DES-based GNFs showed no particle agglomeration and formation of sediments in the nanofluids. Thermo-physical properties such as thermal conductivity and specific heat of the nanofluids were also investigated in this research. The highest thermal conductivity enhancement of 177% was observed. The findings of this research provide a new class of engineered fluid for heat transfer applications as a function of temperature, type and composition DESs as well as the GNPs concentration.