With the continuing development in the electric industry, highly efficient heat dissipation is of great significance due to the shrinkage of electric elements and increase in energy input. Working fluid, acting as a heat transfer medium, plays a core role in the thermal management. While, traditionally used working fluids suffer from either low thermal conductivity or relatively narrow liquid range that are unable to meet the growing demands for highly efficient thermal management. In this work, a silica decorated graphene (SDG) was fabricated using a sol-gel method and dispersed in a deep eutectic solvent (DES) system with the aim at addressing the poor thermal conductivity, stability and narrow working temperature range simultaneously. It is verified that the stability of nanofluids can be significantly improved since it could be kept for one week without obvious precipitation and aggregation due to the presence of silica coating on the layer of graphene. On the other hand, an 11.26% thermal conductivity enhancement was obtained by filling only 3.0 wt.% of the SDG. Moreover, viscosity study reveals that the presence of SDG has a slight influence on the rheological property of the nanofluids.

随着电气工业的不断发展，由于电气元件的收缩和能量输入的增加，高效散热具有重要意义。作为传热介质的工作流体在热管理中起着核心作用。同时，传统使用的工作流体的导热系数低或液体范围相对狭窄，无法满足对高效热管理日益增长的需求。在这项工作中，使用溶胶-凝胶法制备了装饰有二氧化硅的石墨烯（SDG），并将其分散在深共熔溶剂（DES）系统中，旨在同时解决导热性差，稳定性和工作温度范围窄的问题。已经证实，由于在石墨烯层上存在二氧化硅涂层，纳米流体的稳定性可以保持一个星期而没有明显的沉淀和聚集，因此可以显着提高纳米流体的稳定性。另一方面，仅填充3.0即可获得11.26％的导热系数 重量 SDG的百分比。此外，粘度研究表明，SDG的存在对纳米流体的流变性具有轻微的影响。