Thermal conductivity, viscosity and surface tension of nanofluids based on FeC nanoparticles

Huminic, Angel; Huminic, Gabriela; Fleaca, C.; Dumitrache, Florian; Morjan, I.

doi:10.1016/j.powtec.2015.06.040

Cited by 101 publications

(34 citation statements)

References 26 publications

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“…The presence of a-Fe crystalline phase (00-006-0696 JCPDS code) is not certain due to the fact that the diffraction absolute maximum placed at 2q ¼ 44.7 is obscured by the convoluted peak centered at 45 . Moreover, the a-Fe second peak located at 2q ¼ 65.1 for (200) Miller Index was not clearly observed (Huminic et al, 2015). This indicated that iron in the fibers was likely in the state of Fe 7 C 3 and Fe 3 C after calcination at 850 C, and the sample was then abbreviated as FeC x /NCNFs.…”

Section: Characterization Of Fec X /Ncnfsmentioning

confidence: 97%

“…The analysis of the Raman spectrum of the FeC x /NCNFs sample ( Fig. S2) revealed a dominant presence of D (1317 cm À1 ) and G (1591 cm À1 ) bands attributed to amorphous carbon phases (Huminic et al, 2015), but there were no peaks ascribed to the iron oxide phases. This absence can be explained by the good passivation provided by the amorphous carbon shell for the iron-based core, preventing oxidation.…”

Section: Characterization Of Fec X /Ncnfsmentioning

confidence: 99%

See 1 more Smart Citation

Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process

Lan

Sun

et al. 2016

Water Research

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Section: Characterization Of Fec X /Ncnfsmentioning

confidence: 97%

Section: Characterization Of Fec X /Ncnfsmentioning

confidence: 99%

Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process

Lan

Sun

et al. 2016

Water Research

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“…Experimentation has shown that nanofluid thermal conductivity is dependent upon base liquid [3,[9][10][11][12][13][14][15], possible surfactant [16][17][18][19][20][21][22][23], concentration [1,3,4,[7][8][9][10][11]13,15,16,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], temperature [5,8,10,12,13,25,…”

Section: Nanofluid Thermal Conductivitymentioning

confidence: 99%

Nanofluid Thermal Conductivity and Effective Parameters

et al. 2018

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Due to the more powerful and miniaturized nature of modern devices, conventional heat-transfer working fluids are not capable of meeting the cooling needs of these systems. Therefore, it is necessary to improve the heat-transfer abilities of commonly used cooling fluids. Recently, nanoparticles with different characteristics have been introduced to base liquids to enhance the overall thermal conductivity. This paper studies the influence of various parameters, including base liquid, temperature, nanoparticle concentration, nanoparticle size, nanoparticle shape, nanoparticle material, and the addition of surfactant, on nanofluid thermal conductivity. The mechanisms of thermal conductivity enhancement by different parameters are discussed. The impact of nanoparticles on the enhanced thermal conductivity of nanofluids is clearly shown through plotting the thermal conductivities of nanofluids as a function of temperature and/or nanoparticle concentration on the same graphs as their respective base liquids. Additionally, the thermal conductivity of hybrid nanofluids, and the effects of the addition of carbon nanotubes on nanofluid thermal conductivity, are studied. Finally, modeling of nanofluid thermal conductivity is briefly reviewed.

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“…There is an ambiguity with respect to the effect of concentration of the nanoparticle on the behaviour of the interfacial tension of these complex fluids 15,16 . Few studies 4,6,17 report almost a linear increment in surface tension with respect to increase in concentration of solute phase while some authors 5,10 reported just an opposite trend of decreasing nature, and an increasing and then decreasing behaviour has also been reported 18 . Khaleduzzaman et al 15 brief about the lack of clarity on interfacial tension characteristics of nano colloids but could not bring out essential physics behind the problem.…”

Section: Introductionmentioning

confidence: 98%

Effects of interplay of nanoparticles, surfactants and base fluid on the surface tension of nanocolloids

et al. 2017

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A systematically designed study has been conducted to understand and demarcate the degree of contribution by the constituting elements to the surface tension of nanocolloids. The effects of elements such as surfactants, particles and the combined effects of these on the surface tension of these complex fluids are studied employing the pendant drop shape analysis method by fitting the Young-Laplace equation. Only the particle has shown an increase in the surface tension with particle concentration in a polar medium like DI water, whereas only a marginal effect of particles on surface tension in weakly polar mediums like glycerol and ethylene glycol has been demonstrated. Such behaviour has been attributed to the enhanced desorption of particles to the interface and a theory has been presented to quantify this. The combined particle and surfactant effect on the surface tension of a complex nanofluid system showed a decreasing behaviour with respect to the particle and surfactant concentration with a considerably feeble effect of particle concentration. This combined colloidal system recorded a surface tension value below the surface tension of an aqueous surfactant system at the same concentration, which is a counterintuitive observation as only the particle results in an increase in the surface tension and only the surfactant results in a decrease in the surface tension. The possible physical mechanism behind such an anomaly happening at the complex fluid air interface has been explained. Detailed analyses based on thermodynamic, mechanical and chemical equilibrium of the constituents and their adsorption-desorption characteristics as extracted from the Gibbs adsorption analysis have been provided. The present paper conclusively explains several physical phenomena observed, yet hitherto unexplained, in the case of the surface tension of such complex fluids by segregating the individual contributions of each component of the colloidal system.

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Thermal conductivity, viscosity and surface tension of nanofluids based on FeC nanoparticles

Cited by 101 publications

References 26 publications

Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process

Efficient conversion of dimethylarsinate into arsenic and its simultaneous adsorption removal over FeCx/N-doped carbon fiber composite in an electro-Fenton process

Nanofluid Thermal Conductivity and Effective Parameters

Effects of interplay of nanoparticles, surfactants and base fluid on the surface tension of nanocolloids

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