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Thermal conductivity of ethylene glycol based copper nanoparticle decorated graphene nanofluids

In this paper, thermal conductivity of ethylene glycol based copper nanoparticle decorated graphene (Cu/Gr) nanofluids are successfully synthesized by a chemical reduction technique using ascorbic acid antioxidant agent. | Communications in Physics, Vol. 26, No. 4 (2016), pp. 351-360 DOI:10.15625/0868-3166/26/4/8705 THERMAL CONDUCTIVITY OF ETHYLENE GLYCOL BASED COPPER NANOPARTICLE DECORATED GRAPHENE NANOFLUIDS PHAM VAN TRINH1,† , NGUYEN NGOC ANH1 , LE DINH QUANG 1 , BUI HUNG THANG1 , PHAN NGOC HONG1,3 , NGUYEN TUAN HONG2 , PHAN HONG KHOI2 AND PHAN NGOC MINH1,2,3 1 Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Str., Cau Giay Distr., Hanoi, Vietnam 2 Center for High Technology Development, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Str., Cau Giay Distr., Hanoi, Vietnam 3 Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Str., Cau Giay Distr., Hanoi, Vietnam † E-mail: trinhpv@ims.vast.vn Received 25 July 2016 Accepted for publication 26 December 2016 Abstract. In this paper, thermal conductivity of ethylene glycol based copper nanoparticle decorated graphene (Cu/Gr) nanofluids are successfully synthesized by a chemical reduction technique using ascorbic acid antioxidant agent. Nano-sized copper nanoparticles are decorated on functionalized graphene, and then dispersed uniformly in ethylene glycol (EG) to make the nanofluids. Morphology, phase composition and thermal conductivity of nanofluids are investigated in detail. Thermal conductivity of the nanofluid containing Cu/Gr with mass ratio of 5:1 shows an enhancement about 10% and 29% at 30˚C and 60˚C comparing with the EG fluid only. The results show the high potential application of Cu/Gr nanofluids in heat transfer fields. Keywords: graphene, copper decorated graphene, nanofluid, thermal conductivity. Classification numbers: 81.05.ue, 81.70.Pg, 44.90.+c. c 2016 Vietnam Academy of Science and Technology 352 THERMAL CONDUCTIVITY OF ETHYLENE GLYCOL BASED COPPER NANOPARTICLE . I. INTRODUCTION The modern electronic systems integrated of numerous nano-sized components generate a huge amount of heat once