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Highly Thermo-Conductive Three-Dimensional Graphene Aqueous Medium

查看全文 作　　者：Zheng [1,2]Bo;Chongyan [1,2]Ying;Huachao [1,2]Yang;Shenghao [1,2]Wu;Jinyuan [1,2]Yang;Jing [1,2]Kong;Shiling [1,2]Yang;Yanguang [3]Zhou;Jianhua [1]Yan;Kefa [1]Cen 高影响力作者 机构地区：[1]State Key Laboratory of Clean Energy Utilization,Institute for Thermal Power Engineering,College of Energy Engineering,Zhejiang University,38 Zheda Road,Hangzhou 310027,People’s Republic of China;[2]ZJU-Hangzhou Global Scientific and Technological Innovation Center,Hangzhou 311215,People’s Republic of China;[3]Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Clear Water Bay,Kowloon,Hong Kong,People’s Republic of China高影响力机构 出　　处：《Nano-Micro Letters》索引2020年第12卷第10期,共12页高影响力期刊 基　　金：the financial support from National Natural Science Foundation of China(No.51906211);the China Postdoctoral Science Foundation(No.2019M662048);the Key R&D Program of Zhejiang Province(No.2019C01044);the Zhejiang Provincial Natural Science Foundation of China(No.LR17E060002)。 摘　　要：Highly thermo-conductive aqueous medium is a crucial premise to demonstrate high-performance thermal-related applications.Graphene has the diamond comparable thermal conductivity,while the intrinsic two-dimensional reality will result in strong anisotropic thermal conductivity and wrinkles or even crumples that significantly sacrifices its inherent properties in practical applications.One strategy to overcome this is to use three-dimensional(3D)architecture of graphene.Herein,3D graphene structure with covalent-bonding nanofins(3D-GS-CBF)is proposed,which is then used as the filler to demonstrate effective aqueous medium.The thermal conductivity and thermal conductivity enhancement efficiency of 3D-GS-CBF(0.26 vol%)aqueous medium can be as high as 2.61 W m-1 K-1 and 1300%,respectively,around six times larger than highest value of the existed aqueous mediums.Meanwhile,3D-GS-CBF can be stable in the solution even after 6 months,addressing the instability issues of conventional graphene networks.A multiscale modeling including non-equilibrium molecular dynamics simulations and heat conduction model is applied to interpret experimental results.3D-GS-CBF aqueous medium can largely improve the solar vapor evaporation rate(by 1.5 times)that are even comparable to the interfacial heating system;meanwhile,its cooling performance is also superior to commercial coolant in thermal management applications. 关 键 词：Three-dimensional graphene Thermo-conductive aqueous medium Multiscale modeling Solar thermal conversion Practical thermal management
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