Synthesis, stability, transport properties, and surface wettability of reduced graphene oxide/water nanofluids

Kamatchi, R.; Venkatachalapathy, S.; Srinivas, B.

doi:10.1016/j.ijthermalsci.2015.06.011

Cited by 80 publications

(29 citation statements)

References 32 publications

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“…On the other hand, the linear relationship between shear stress and shear rate indicates that both base fluid and nanofluids exhibit a Newtonian behavior over the studied conditions. This Newtonian behavior coincides with the results found by Kamatchi et al [57] and Mehrali et al [58] for graphene oxide-water nanofluids at shear rates higher than 80 s −1 or by Ma et al [63] for nanofluids based on dimethyl silicone oil, for example. The temperature dependence of dynamic viscosity measurements is plotted in Fig.…”

Section: Resultssupporting

confidence: 91%

“…A good agreement was found in literature between experimental data and the values obtained using Nan model [55] for different nanofluids in general [56] and for graphene nanoplatelet dispersions in particular [15, 20, 31, 57, 58]. Nan et al [55] generalized Maxwell equation including the effects of particle geometry and finite interfacial resistance by the following expression: …”

Section: Resultssupporting

confidence: 64%

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Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

et al. 2017

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This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions of sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture at (10:90)% mass ratio. Nanofluid preparation conditions were defined through a stability analysis based on zeta potential and dynamic light scattering (DLS) measurements. Thermal conductivity, dynamic viscosity, and density were experimentally measured in the temperature range from 283.15 to 343.15 K and nanoparticle mass concentrations of up to 0.50% by using a transient plate source, a rotational rheometer, and a vibrating-tube technique, respectively. Thermal conductivity enhancements reach up to 5% without a clear effect of temperature while rheological tests evidence a Newtonian behavior of the studied nanofluids. Different equations such as the Nan, Vogel-Fulcher-Tamman (VFT), or Maron-Pierce (MP) models were utilized to describe the temperature or nanoparticle concentration dependences of thermal conductivity and viscosity. Finally, different figures of merit based on the experimental values of thermophysical properties were also used to compare the heat transfer capability and pumping power between nanofluids and base fluid.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 64%

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

et al. 2017

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“…50-60°C; thus, it takes place during boiling. Although reduced graphene oxide (rGO) is hydrophobic, it can still absorb water into its structure after some period of time [50] graphene oxide-water nanofluids conducted by Kamatchi et al [17], before and after boiling on both smooth and rough surfaces. The study confirmed dual wettability of rGO caused by activation of the carboxyl groups on the flake surface.…”

Section: Time Averaged Datamentioning

confidence: 99%

“…Most of the research on nanofluids focused on the heat transfer, pressure drop, and energy analysis [1,2,[7][8][9][10][11][12][13][14][15]. These main performance parameters depend on broadly researched fundamental properties like thermal conductivity, viscosity, density, and specific heat capacity [3,[16][17][18][19][20][21][22][23]. Most recently, Estellé et al [24] reviewed studies on surface tension and wetting behaviour of nanofluids which are key parameters for understanding heat transfer during boiling.…”

Section: Introductionmentioning

confidence: 99%

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Wlaźlak

Zajączkowski

Woluntarski

et al. 2018

J Therm Anal Calorim

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The paper presents a thermal performance analysis of a thermosyphon filled with graphene oxide nanofluid. It focuses on factors influencing thermal resistance and geyser boiling processes, such as the presence of surfactant (here: sodium dodecyl sulphate), the time-related deterioration of nanoparticles, and working conditions. Results indicate that GO nanofluids improved heat transfer at low heat loads and that enhancements were limited to the evaporator section. Although thermal resistance of the device was similar for all tested working fluids at high evaporator temperatures, the timedependent behaviour was different. Both water and GO nanofluid facilitated geyser boiling. Sodium dodecyl sulphate inhibited the phenomenon for pure water, but the same concentration of surfactant in the graphene oxide nanofluid did not show the same effect. SEM analysis showed that substantial amount of surfactant attached to the surface of graphene oxide flakes, which explains the previously described behaviour.

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“…Outer diameter (nm) Hajjar et al [38] conducted experiments on graphene oxide nanofluids at temperatures of 10, 20, 30, and 40 • C, with varying concentrations of 0.05, 0.10, 0.15, 0.20, and 0.25 wt%, and concluded that a maximum thermal conductivity enhancement of 47.54% was observed for 0.25 wt% graphene oxide at a temperature of 40 • C. Kamtchi et al [39] conducted experimental studies on a graphene oxide-water nanofluid and reported thermal conductivity enhancements of 0.82%-3.51%, 1.58%-6.71%, and 3.96%-10% for concentrations of 0.01, 0.1, and 0.3 g/L, respectively. The authors pointed out that these enhancements were higher compared to aqueous Al 2 O 3 , CuO, and diamond nanofluids for the same concentrations, and reasoned that this may be due to enhanced Brownian motion.…”

Section: S-swnts L-swnts Mwntsmentioning

confidence: 99%

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

Patil

Seo²,

Kang

et al. 2016

Energies

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Nanofluids are suspended nano-sized particles in a base fluid. With increasing demand for more high efficiency thermal systems, nanofluids seem to be a promising option for researchers. As a result, numerous investigations have been undertaken to understand the behaviors of nanofluids. Since their discovery, the thermo-physical properties of nanofluids have been under intense research. Inadequate understanding of the mechanisms involved in the heat transfer of nanofluids has been the major obstacle for the development of sophisticated nanofluids with the desired properties. In this comprehensive review paper, investigations on synthesis, thermo-physical properties, and heat transfer mechanisms of nanofluids have been reviewed and presented. Results show that the thermal conductivity of nanofluids increases with the increase of the operating temperature. This can potentially be used for the efficiency enhancement of thermal systems under higher operating temperatures. In addition, this paper also provides details concerning dependency of the thermo-physical properties as well as synthesis and the heat transfer mechanism of the nanofluids.

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Synthesis, stability, transport properties, and surface wettability of reduced graphene oxide/water nanofluids

Cited by 80 publications

References 32 publications

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Review on Synthesis, Thermo-Physical Property, and Heat Transfer Mechanism of Nanofluids

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