Remarkable thermal conductivity enhancement in Ag—decorated graphene nanocomposites based nanofluid by laser liquid solid interaction in ethylene glycol

Abstract

We report on the synthesis and enhanced thermal conductivity of stable Ag-decorated 2-D graphene nanocomposite in ethylene glycol based nanofluid by laser liquid solid interaction. A surfactant free nanofluid of Ag nanoparticles anchored onto the 2-D graphene sheets were synthesized using a two-step laser liquid solid interaction approach. In order to understand a pulsed Nd:YAG laser at the fundamental frequency (λ = 1,064 nm) to ablate Ag and graphite composite target submerged in ethylene glycol (EG) to form AgNPs decorated 2-D GNs-EG based nanofluid. From a heat transfer point of view, it was observed that the thermal conductivity of this stable Ag-graphene/EG is significantly enhanced by a factor of about 32.3%; this is highest reported value for a graphene based nanofluid.

In situ synthesis of hydroxyapatite nanorods on graphene oxide nanosheets and their reinforcement in biopolymer scaffold

“…Graphene oxide (GO), as an oxidized form of graphene sheets, has attracted tremendous attention in reinforcing biopolymer because of the excellent mechanical properties [1] , [2] , [3] . It can form strong interfacial interactions with biopolymer matrix [4] , [5] , and provide reactive sites for generating new composites with superior properties as compared to their individual components on account of the presence of plentiful oxygen functional groups [6] , [7] , [8] . Hydroxyapatite (HAP), as a calcium phosphate, possesses excellent bioactivity and osteoconductivity because of its chemical composition similarity to natural bone [9] , [10] , [11] .…”

Functionalized few‐layered graphene nanoplatelets for superior thermal management in heat transfer nanofluids

“…The addition of finely dispersed metal or metal oxide particles in coolant fluids has reportedly shown significant enhancement in their thermal conductivity. [1][2][3] Thermophysical properties, including thermal conductivity, specific heat, thermal expansion, and kinematic viscosity, of a coolant liquid represent its ability to cool a device. The thermal conductivities of fluids can be improved by mixing nano additives with a high thermal conductivity in the fluid.…”

“…11 To this end, many kinds of metal (Ag, Au, Cu) and oxide (Al 2 O 3 , TiO 2 , ZnO, CuO) nanoparticles have been investigated in heat transfer nanofluids to demonstrate significantly higher thermal conductivities than those of pure base liquids. 1,[12][13][14][15][16] In the context of nonmetallic materials, graphene has emerged as a promising alternative due to its extraordinary structural, thermal, and electronic properties. [17][18][19] In a typical nanofluid, heat transfer occurs via three different mechanisms namely Brownian motion, interfacial liquid layering, and particle clustering.…”

“…The thermal conductivities of standard coolant systems operating with conventional fluids such as water (W) or ethylene glycol (EG) are generally low (<1 W m −1 K −1 ). The addition of finely dispersed metal or metal oxide particles in coolant fluids has reportedly shown significant enhancement in their thermal conductivity 1–3 . Thermophysical properties, including thermal conductivity, specific heat, thermal expansion, and kinematic viscosity, of a coolant liquid represent its ability to cool a device.…”

“…They showed that base fluids containing nanophase copper particles can double the rate of heat transfer without an increase in the pumping power 11 . To this end, many kinds of metal (Ag, Au, Cu) and oxide (Al 2 O 3 , TiO 2 , ZnO, CuO) nanoparticles have been investigated in heat transfer nanofluids to demonstrate significantly higher thermal conductivities than those of pure base liquids 1,12–16 . In the context of nonmetallic materials, graphene has emerged as a promising alternative due to its extraordinary structural, thermal, and electronic properties 17–19 .…”