Effects of graphene oxide‑silicon oxide hybrid nanomaterials on rheological behavior of water at various time durations and temperatures: Synthesis, preparation and stability

Ranjbarzadeh, Ramin; Akhgar, Alireza; Musivand, Sogand; Afrand, Masoud

doi:10.1016/j.powtec.2018.05.036

Cited by 108 publications

(28 citation statements)

References 59 publications

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“…The method of preparing nanofluids influences the quality of dispersed nanoparticles in the base fluid. It is crucial to prevent the agglomeration of nanoparticles during the preparation process [22,23]. Instability and accumulation due to the intermolecular forces in nanoparticles cause variations in the thermophysical properties of nanofluids [24].…”

Section: Preparation Of Nano Lubricantmentioning

confidence: 99%

Experimental Study of Thermal Properties and Dynamic Viscosity of Graphene Oxide/Oil Nano-Lubricant

Ranjbarzadeh

Chaabane

2021

Energies

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This experimental study was carried out based on the nanotechnology approach to enhance the efficacy of engine oil. Atomic and surface structures of graphene oxide (GO) nanoparticles were investigated by using a field emission scanning electron microscope and X-ray diffraction. The nano lubricant was produced by using a two-step method. The stability of nano lubricant was analyzed through dynamic light scattering. Various properties such as thermal conductivity, dynamic viscosity, flash point, cloud point and freezing point were investigated and the results were compared with the base oil (Oil- SAE-50). The results show that the thermal conductivity of nano lubricant was improved compared to the base fluid. This increase was correlated with progressing temperature. The dynamic viscosity was increased by variations in the volume fraction and reached its highest value of 36% compared to the base oil. The cloud point and freezing point are critical factors for oils, especially in cold seasons, so the efficacy of nano lubricant was improved maximally by 13.3% and 12.9%, respectively, compared to the base oil. The flash point was enhanced by 8%, which remarkably enhances the usability of the oil. It is ultimately assumed that this nano lubricant to be applied as an efficient alternative in industrial systems.

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Section: Preparation Of Nano Lubricantmentioning

confidence: 99%

Experimental Study of Thermal Properties and Dynamic Viscosity of Graphene Oxide/Oil Nano-Lubricant

Ranjbarzadeh

Chaabane

2021

Energies

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“…Preparing a stable nanofluid is the main challenge when employing nanofluids [43]. Formation of agglomerates, due to the presence of intermolecular forces between nanoparticles, changes the thermophysical properties of nanofluid [44,45]. Dealing with this problem is a high-priority task in practical applications of nanofluids.…”

Section: Preparation Methods Of Sio 2 Nanofluidsmentioning

confidence: 99%

“…The results of nanofluid stability analysis after six months indicated that no sediments were formed in the container. According to studies, theoretical correlations do not have the ability to predict changes in the thermophysical behavior of the nanofluid because nanofluids do not have the same behavior [45,46]. Then, due to the mechanism and complex structure of nanoparticles, as well as their different…”

Section: Preparation Methods Of Sio 2 Nanofluidsmentioning

confidence: 99%

An experimental study on stability and thermal conductivity of water/silica nanofluid: Eco-friendly production of nanoparticles

Ranjbarzadeh

Moradikazerouni

Bakhtiari

et al. 2019

Journal of Cleaner Production

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176

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In the present experimental study, an eco-friendly process (synthesized from rice plant source) was used to produce silica nanoparticles. Silica nanoparticles are environmentally friendly nanoparticles that have high heat transfer potential due to its abundant natural resources, low cost synthesis and mass production. The surface and atomic structure of the nanoparticles have been investigated through SEM and FTIR tests. After production of nanoparticles, water/silica nanofluid samples were prepared using two-step method that called eco-friendly nanofluid. Stability and thermal conductivity of the eco-friendly nanofluid were examined. Investigating the stability of the prepared samples, the DLS and TEM tests have been conducted as well as periodic visual observation of possible sedimentation over a period of six months through photography. The stability results indicated that the prepared samples possess excellent nano-structure and it showed long-time stability even after six months of preparation. The thermal conductivity measurement of the samples has been done in different temperatures ranging from 25 to 55 ℃ and solid volume fractions of 0.1, 0.25, 0.5, 1, 1.5, 2, 2.5, and 3 %. The results showed the maximum thermal conductivity

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“…Most of them are focused on the decrease in viscosity with increasing temperature 20 . The literature survey that follows is restricted to the experimental viscosity investigation of graphene‐based and its hybrid nanofluids 23‐43 . The first work related to graphene nanofluid was 23 .…”

Section: Introductionmentioning

confidence: 99%

An experimental viscosity investigation on the use of non‐Newtonian graphene heat transfer nanofluids at below‐ambient temperatures

Sica

Contreras

Filho

et al. 2021

Intl J of Energy Research

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The enhanced thermal conductivity of nanofluids justifies their application to traditional niches of heat transfer fluids. For Newtonian materials, however, viscosity, pressure drop, and ultimately, pumping power, also increase with nanoparticle concentration. A different behavior, though, may be observed with non-Newtonian nanofluids. This possibility motivated the present work, in which aqueous solutions of refrigeration secondary fluid and prime-mover coolant were enriched by graphene nanoparticles (thickness: 0.55-3.74 nm; average length: 5-10 μm). Viscosity variation with shear stress was experimentally investigated for temperatures within (−10 C < T < 25 C). Shear thinning and shear thickening were observed and described in detail by means of flow curves for each fluid sample (base fluid and nanofluids). The patterns for the curve fitting parameters of a modified version of the Herschel-Bulkley equation were analyzed, tabulated, and modeled. Finally, the relative apparent viscosity data were compared with four classical models. HIGHLIGHTS:• Synthesis of graphene non-Newtonian heat transfer nanofluids.• The spectrum of temperatures ranged from -10 C to 25 C.• Shear thinning and shear thickening were observed and described in detail.• Herschel-Bulkley-like equation was observed, parameters patterns were modeled.• Relative apparent viscosity data were compared with four classical models.

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Effects of graphene oxide‑silicon oxide hybrid nanomaterials on rheological behavior of water at various time durations and temperatures: Synthesis, preparation and stability

Cited by 108 publications

References 59 publications

Experimental Study of Thermal Properties and Dynamic Viscosity of Graphene Oxide/Oil Nano-Lubricant

Experimental Study of Thermal Properties and Dynamic Viscosity of Graphene Oxide/Oil Nano-Lubricant

An experimental study on stability and thermal conductivity of water/silica nanofluid: Eco-friendly production of nanoparticles

An experimental viscosity investigation on the use of non‐Newtonian graphene heat transfer nanofluids at below‐ambient temperatures

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