Transport and thermal properties of quaternary phosphonium ionic liquids and IoNanofluids

Ferreira, Abel G.M.; Simões, Pedro; Fonseca, A.; Oliveira, Mónica; Trino, A.S.M.

doi:10.1016/j.jct.2013.04.013

Cited by 97 publications

(56 citation statements)

References 69 publications

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“…The significant non-Newtonian, shear thinning behavior of such nanodispersions could have resulted from the reversible disruption of intermolecular interactions, as well as the orientation of nanoparticles in the flow direction, which reduced the flow resistance. 36 , 55 , 57 The effect of temperature (25–70 °C) on the viscosity of INFs was tested only for samples containing in-house 7 h MWCNTs. In contrast to pure IL which exhibited Newtonian behavior at each tested temperature ( Figure S3A, Supporting Information ), the INFs with various loadings of in-house MWCNTs had shear thinning properties in all cases ( Figure S3B–E, Supporting Information ).…”

Section: Resultsmentioning

confidence: 99%

Remarkable Thermal Conductivity Enhancement in Carbon-Based Ionanofluids: Effect of Nanoparticle Morphology

Jóźwiak

Dzido

Zorębski

et al. 2020

ACS Appl. Mater. Interfaces

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Transfer of the excellent intrinsic properties of individual carbon nanoparticles into real-life applications of the corresponding heat transfer fluids remains challenging. This process requires identification and quantification of the nanoparticle–liquid interface. Here, for the first time, we have determined geometry and properties of this interface by applying transmission electron cryomicroscopy (cryo-TEM). We have systematically investigated how the particle morphology of carbon-based nanomaterials affected the thermal conductivity, specific isobaric heat capacity, thermal diffusivity, density, and viscosity of ionanofluids and/or bucky gels, using a wide range of fillers, especially single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs), both with extreme values of aspect ratio (length to diameter ratio) from 150 to 11 000. Accordingly, hybrid systems composed of various carbon nanomaterials and ionic liquid, namely 1-ethyl-3-methylimidazolium thiocyanate [EMIM][SCN], were prepared and characterized. Most of the analyzed nanodispersions exhibited long-term stability even without any surfactant. Our study revealed that the thermal conductivity could be remarkably improved to the maximum values of 43.9% and 67.8% for ionanofluid and bucky gel (at 1 wt % loadings of MWCNTs and SWCNTs), respectively, compared to the pristine ionic liquid. As a result, the model proposed by Murshed and co-workers has been improved for realistic description of the concentration-dependent thermal conductivity of such hybrid systems. The obtained results undoubtedly indicate the potential of ionanofluids and bucky gels for energy management.

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Section: Resultsmentioning

confidence: 99%

Remarkable Thermal Conductivity Enhancement in Carbon-Based Ionanofluids: Effect of Nanoparticle Morphology

Jóźwiak

Dzido

Zorębski

et al. 2020

ACS Appl. Mater. Interfaces

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“…1,[5][6][7][8][9][10][11] However fundamental studies on the extent of structuring present in quaternary phosphonium ionic liquids remain quite limited. 12 The more recent accounts of the behavior of these salts include solvation, 13,14 transport and thermal properties, 15,16 and solubility and phase behavior. 17 Consequently, the unique qualities of this class of materials known so far have found value in several applications such as in extractions, 18,19 separations, 20 catalysis, 21 synthesis of new materials, 22,23 electrochemistry, 24,25 and lubrication.…”

Section: Introductionmentioning

confidence: 99%

Sum frequency generation spectroscopy of tetraalkylphosphonium ionic liquids at the air–liquid interface

Peñalber-Johnstone

Adamova

Plechkova

et al. 2018

The Journal of Chemical Physics

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Sum frequency generation (SFG) spectroscopy is a nonlinear vibrational spectroscopic technique used in the study of interfaces, due to its unique ability to distinguish surface molecules that have preferential ordering compared to the isotropic bulk. Here, a series of alkyltrioctylphosphonium chloride ionic liquids, systematically varied by cation structure, were characterized at the air-liquid interface by SFG. The effect on surface structure resulting from molecular variation (i.e., addition of cyano-and methoxy-functional groups) of the cation alkyl chain was investigated. SFG spectra in the C− −H stretching region (2750-3100 cm 1) for [P 8 8 8 n ][Cl], where n = 4, 5, 8, 10, 12, or 14, showed characteristic changes as the alkyl chain length was increased. Spectral profiles for n = 4, 5, 8, or 10 appeared similar; however, when the fourth alkyl chain was sufficiently long (as in the case of n = 12 or n = 14), abrupt changes occurred in the spectra. Molecular dynamics (MD) simulation of a slab of each ionic liquid (with n = 8, 10, or 12) confirmed gauche defects, with enhancement for the long alkyl chain and an abrupt increase of gauche occurrence from n = 8 to n = 10. A comparison of the tilt angle distribution from the simulation and the SFG analysis show a broad distribution of angles. Using experimental SFG spectra in conjunction with MD simulations, a comprehensive molecular picture at the surface of this unique class of liquids is presented.

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“…In light of previous evidence, it is important to investigate the benefit of utilizing ILs augmented with nanoparticles. By adding only a small amount of nanoparticles into pure ILs, the thermophysical properties of ILs will be enhanced [9,[15][16][17][18]. A similar idea has been observed in the chemical-enhanced oil recovery methods, which increase the amount of recovered oil by adding a very small amount of nanoparticles to the injected water [19].…”

Section: Introductionmentioning

confidence: 53%

“…Ionic liquids (ILs) are a novel group of salt-like materials that are liquid under ambient conditions [8] and have great potential for use in different industries. Although their transport properties have been widely investigated in recent years, investigations of the thermal properties are very limited in the literature [9][10][11][12]. Because of their excellent thermal properties, such as high thermal conductivity (TC) and high heat capacity (C p ), they are recognized as an appealing candidate for heat transfer applications [13,14].…”

Section: Introductionmentioning

confidence: 99%

Estimating the Heat Capacity of Non-Newtonian Ionanofluid Systems Using ANN, ANFIS, and SGB Tree Algorithms

et al. 2020

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This work investigated the capability of multilayer perceptron artificial neural network (MLP–ANN), stochastic gradient boosting (SGB) tree, radial basis function artificial neural network (RBF–ANN), and adaptive neuro-fuzzy inference system (ANFIS) models to determine the heat capacity (Cp) of ionanofluids in terms of the nanoparticle concentration (x) and the critical temperature (Tc), operational temperature (T), acentric factor (ω), and molecular weight (Mw) of pure ionic liquids (ILs). To this end, a comprehensive database of literature reviews was searched. The results of the SGB model were more satisfactory than the other models. Furthermore, an analysis was done to determine the outlying bad data points. It showed that most of the experimental data points were located in a reliable zone for the development of the model. The mean squared error and R2 were 0.00249 and 0.987, 0.0132 and 0.9434, 0.0320 and 0.8754, and 0.0201 and 0.9204 for the SGB, MLP–ANN, ANFIS, and RBF–ANN, respectively. According to this study, the ability of SGB for estimating the Cp of ionanofluids was shown to be greater than other models. By eliminating the need for conducting costly and time-consuming experiments, the SGB strategy showed its superiority compared with experimental measurements. Furthermore, the SGB displayed great generalizability because of the stochastic element. Therefore, it can be highly applicable to unseen conditions. Furthermore, it can help chemical engineers and chemists by providing a model with low parameters that yields satisfactory results for estimating the Cp of ionanofluids. Additionally, the sensitivity analysis showed that Cp is directly related to T, Mw, and Tc, and has an inverse relation with ω and x. Mw and Tc had the highest impact and ω had the lowest impact on Cp.

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Transport and thermal properties of quaternary phosphonium ionic liquids and IoNanofluids

Cited by 97 publications

References 69 publications

Remarkable Thermal Conductivity Enhancement in Carbon-Based Ionanofluids: Effect of Nanoparticle Morphology

Remarkable Thermal Conductivity Enhancement in Carbon-Based Ionanofluids: Effect of Nanoparticle Morphology

Sum frequency generation spectroscopy of tetraalkylphosphonium ionic liquids at the air–liquid interface

Estimating the Heat Capacity of Non-Newtonian Ionanofluid Systems Using ANN, ANFIS, and SGB Tree Algorithms

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