Structural and transport properties and solubility parameter of graphene/glycerol nanofluids: A molecular dynamics simulation study

Moghaddam, Monireh B.; Goharshadi, Elaheh Kafshdare; Moosavi, Fatemeh

doi:10.1016/j.molliq.2016.07.014

Cited by 21 publications

(12 citation statements)

References 23 publications

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“…The Hildebrand solubility parameter (δ2) is a physical and chemical parameter that is inherent to a substance, which is commonly used in the formulation design, chemical additive distribution, solvent selection, and system stability studies and membrane penetration [12,13]. The Hildebrand solubility parameter is usually obtained by dynamic mechanical analysis, titration methods, swelling measurements, group contribution calculation methods, and viscosity measurements [14,15]. However, these methods are often time-consuming and laborious.…”

Section: Introductionmentioning

confidence: 99%

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Zhu

Wang

et al. 2019

Molecules

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The physicochemical properties of four 1-alkyl-3-methylimidazolium bromide ([CnC1im]Br, n = 5, 6, 7, 8) ionic liquids (ILs) were investigated in this work by using inverse gas chromatography (IGC) from 303.15 K to 343.15 K. Twenty-eight organic solvents were used to obtain the physicochemical properties between each IL and solvent via the IGC method, including the specific retention volume and the Flory–Huggins interaction parameter. The Hildebrand solubility parameters of the four [CnC1im]Br ILs were determined by linear extrapolation to be δ 2 ( [ C 5 C 1 im ] Br ) = 25.78 (J·cm−3)0.5, δ 2 ( [ C 6 C 1 im ] Br ) = 25.38 (J·cm−3)0.5, δ 2 ( [ C 7 C 1 im ] Br ) =24.78 (J·cm−3)0.5 and δ 2 ( [ C 8 C 1 im ] Br ) = 24.23 (J·cm−3)0.5 at room temperature (298.15 K). At the same time, the Hansen solubility parameters of the four [CnC1im]Br ILs were simulated by using the Hansen Solubility Parameter in Practice (HSPiP) at room temperature (298.15 K). The results were as follows: δ t ( [ C 5 C 1 im ] Br ) = 25.86 (J·cm−3)0.5, δ t ( [ C 6 C 1 im ] Br ) = 25.39 (J·cm−3)0.5, δ t ( [ C 7 C 1 im ] Br ) = 24.81 (J·cm−3)0.5 and δ t ( [ C 8 C 1 im ] Br ) = 24.33 (J·cm−3)0.5. These values were slightly higher than those obtained by the IGC method, but they only exhibited small errors, covering a range of 0.01 to 0.1 (J·cm−3)0.5. In addition, the miscibility between the IL and the probe was evaluated by IGC, and it exhibited a basic agreement with the HSPiP. This study confirms that the combination of the two methods can accurately calculate solubility parameters and select solvents.

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Section: Introductionmentioning

confidence: 99%

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Zhu

Wang

et al. 2019

Molecules

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“…Additionally, Sadeghinezhad et al [111] reported a decrease in nanofluid viscosity of up to 38% with rising the temperature between 293 and 333 K at shear rate of 500 s -1 . Moghaddam et al investigated experimentally [112] and theoretically [113] the glycerol-based nanofluids containing graphene nanosheets with few layers and size of about 15-50 nm. The prepared nanofluids were in the concentration range of 0.0025-0.02 wt% and their viscosity was measured at temperatures between 293 and 333 K. In addition to a shear thinning behavior of suspensions (more appreciable with rising nanoparticle concentration), which authors attributed to the complex interactions between the glycerol and graphene nanosheets, a maximum increase in dynamic viscosity of 401.49% was observed for 2% graphene nanosheets load at 293 K and the shear rate of 6.32 s -1 .…”

Section: 3 Graphene-based Nanofluidsmentioning

confidence: 99%

Graphene-based nanofluids: A comprehensive review about rheological behavior and dynamic viscosity

Hamze

Cabaleiro

Estellé

2021

Journal of Molecular Liquids

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Graphene derivatives are promising nanomaterials for producing nanofluids due to their excellent intrinsic characteristics. Among thermophysical profile, and in addition to thermal properties, relevant property to evaluate the potential of graphene-based nanofluids as efficient and reliable heat transfer fluids is viscosity, and rheological behavior in a wider sense. Therefore, the aim of this review paper is to give a comprehensive overview of the current knowledge and results about the rheological properties of graphene-based nanofluids. After a brief description of the most common methods used for fabricating or extracting graphene derivatives, the main steps of graphenebased nanofluids preparation are introduced. Then, literature results on Newtonian/non-Newtonian behavior as well as variations in apparent dynamic viscosity of suspensions containing graphene derivatives are reviewed, analyzing the effects of shear rate, concentration, base fluids and temperature. Such an analysis is performed distinguishing the different types of graphene derivatives, namely graphene oxide, reduced graphene oxide, pristine graphene, graphene quantum dots, functionalized and doped graphene. Also, the impact of base fluid, temperature, concentration and surfactant on viscosity enhancement of graphene-based nanofluids is graphically and newly presented and discussed. In addition, the current models for viscosity prediction or correlation of those nanofluids are detailed. Finally, challenges and future works are summarized.

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“…Graphene suspension was sprayed onto metal sheet surfaces using an air blush (HKX HB3G, no.HM2200). Spraying pressure (20,30, and 40 psi) and suspension quantities (2.0, 3.0, and 4.0 ml) were cogitated to find an optimal condition for graphene spraying. The spraying pressure is required to accelerate the velocity of graphene particles in attacking metal surfaces and to allow for a decrease in graphene agglomeration.…”

Section: Graphene Spraying Onto Metal Sheet Surfacesmentioning

confidence: 99%

“…Agglomerated graphene nanoplatelets were progressively fragmented and dispersed by actions of shockwaves and shear force generated from ultrasonic cavitation [29]. By comparing different solvents, it was clear that graphene acquired the best dispersion stability in dimethylformamide, since its solubility parameters, surface tension and dipole moments are about the same as the values of graphene [30,31].…”

Section: Remedy For Graphene Agglomerationmentioning

confidence: 99%

Metal-insert technique for polypropylene composite bipolar plate manufacturing

Yeetsorn

Maiket

2020

Journal of Polymer Engineering

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A single cell of direct methanol fuel cell (DMFC) typically delivers an electrical potential between 0.5 and 1 V; thus DMFCs are assembled in parallel to meet power demands (1–5 kW). Bipolar plates (BPs) are the primary components connecting a single cell to the adjacent cells so that they provide optimum electrical conductivity. The objective of this research is to reduce the volume resistance of BPs made from a polypropylene/carbon composite by utilizing a metal insert technique. A major obstacle when it comes to molding composite plates inserted by a thin metal sheet is the delamination of material layers after the cooling process. The delamination issue is due to different surface polarities between metal and polypropylene-composite surfaces. One of the strategies to solve this issue is to modify the surface of one layer for creating similarity of the surface polarity. A metal sheet surface was coated with graphene using a cold spraying technique to enhance adhesion ability. The suitable spraying conditions were determined by experimenting with varying temperature, pressure, graphene quantity and graphene types. The effectiveness of surface modification by the graphene spraying technique was assessed by a surface morphology observation, an electrical conductivity measurement and DMFC performance tests. Results were interesting, they indicated that when DMFC was assembled with silver sheet, inserted BPs provided 25.13 mW/cm2 of power density, 3,350.7 mWh of generated energy and 67% of efficiency. This highlights that the performance of a BP prototype is superior to the performance of a commercial composite bipolar plate.

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Structural and transport properties and solubility parameter of graphene/glycerol nanofluids: A molecular dynamics simulation study

Cited by 21 publications

References 23 publications

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Graphene-based nanofluids: A comprehensive review about rheological behavior and dynamic viscosity

Metal-insert technique for polypropylene composite bipolar plate manufacturing

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