Influence of silica nanoparticles on mass transfer in a membrane-based micro-contactor

Ashrafmansouri, Seyedeh-Saba; Willersinn, Stefan; Esfahany, Mohsen Nasr; Bart, Hans‐Jörg

doi:10.1039/c5ra26056f

Cited by 16 publications

(10 citation statements)

References 57 publications

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“…(inverse Debye length) (12) where, ε 0 is the permittivity of free-space, ε r is the relative permittivity of the medium, η is the viscosity of the medium, k is the Boltzmann constant, T is the temperature, Z is the valency of the ions of the assumed symmetric electrolyte-i.e., equal for positive and negative ions Z = Z + = −Z − , e is the elementary positive charge, ζ is the zeta-potential at the particle surface, D + and D − are the diffusion coefficients of the positive and negative ions respectively, N A is the Avogadro number, and C ∞ is the concentration (in mM) of the solute far from the particle surface. n is the number of species.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of a small fraction of nanoparticles as a suspension in a fluid (also referred to as nanofluids) seems to immensely influence various phenomenon like diffusion [1][2][3], absorption [4][5][6][7][8][9], extraction [10][11][12], in radiation [13], electric conductivity [14], evaporation [15] and reaction kinetics of chemical processes. Mass transfer studies in dye-diffusion by Krishnamurthy et al 1 and others [2,3] have demonstrated, through dramatic visual effects, that the presence of nanoparticles increases the effective diffusivity up to 14 folds.…”

Section: Introductionmentioning

confidence: 99%

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Diffusiophoretic enhancement of mass transfer by nanofluids

Dhuriya

Dalia

Sunthar

2018

Chemical Engineering Science

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Observations of an enhanced mass transfer in nanofluids have led to several propositions for the underlying cause, but none of them have been clearly established. Here, we reproduce the enhancement phenomenon within a glass capillary containing fluorescein di-sodium dye solution on one side and alumina nanoparticle suspension on the other, avoiding convective interferences present earlier. The enhancement is explained by the counterconvective motion of the dye solution in response to the diffusiophoretic motion of the nanoparticles towards a higher concentration of the dye. The velocity of the dye front agrees with the theoretical estimate obtained from the diffusiophoretic velocity of alumina nanoparticles in a gradient of fluorescein di-sodium electrolyte solution. With a suitably chosen nanofluid, it should now be possible to effect the enhancement (or suppression) of mass transfer of a given solute.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffusiophoretic enhancement of mass transfer by nanofluids

Dhuriya

Dalia

Sunthar

2018

Chemical Engineering Science

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“…Rahbar Kelishami et al [152] In another study, Ashrafmansouri et al [154] used a membrane based micro-contactor to perform an experimental study of the improvement of mass transfer in the contactor using SiO 2 nanoparticles. The enhancement caused by the nanoparticles was more pronounced at lower flow rates.…”

Section: Saien and Zardoshtimentioning

confidence: 99%

“…According to their results, the enhancement was due to the Brownian motion of the nanoparticles motion and the induced microconvection. In contrast, the decrease in mass transfer above 0.001 vol.% was attributed to the reduction in the free volume and nanoparticle aggregation at greater concentrations [154]. The experimental studies of the effect of nanoparticles on the mass transfer performance of liquid-liquid extraction contactors in the absence of a magnetic field are summarized in Table 3.…”

Section: Saien and Zardoshtimentioning

confidence: 99%

A critical review on the use of nanoparticles in liquid–liquid extraction

Amani

Ahmadi

et al. 2018

Chemical Engineering Science

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Recently, the use of nanoparticles in extraction columns has gained increasing attention due to their potential to enhance mass transfer processes. Most of the reported work, however, has been concerned with mass transfer enhancement in gas-liquid systems in the presence of nanoparticles, while limited studies of liquid-liquid systems have been reported. Liquidliquid extraction is an extensively employed separation method that has taken on a substantial role in engineering and industrial applications for recovery processes. Therefore, the aim of this review article is to provide an overview of the state-of-the-art from the available literature on the effect of nanoparticles on the hydrodynamic behavior and mass transfer performance of liquid-liquid systems. Attention is also given to providing an understanding of the mechanisms responsible for the improvements in mass transfer with the use of nanoparticles. In the majority of studies, the presence of nanoparticles was found to be beneficial and to lead to improved mass transfer, although a few investigations reported a detrimental impact of nanoparticles. The literature does not clearly describe the conditions under which the addition of nanoparticles would be unfavorable. Moreover, the addition of nanoparticles always introduces potential drawbacks, such as sedimentation, accumulation, or clogging inside extraction columns, as well as the need to separate the nanoparticles at the outlets. These drawbacks have not been considered in the literature, limiting the practical employment of nanoparticles in this industry.

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“…Mass‐transfer phenomenon in two‐phase MCs and MRs has been studied in the literature . Some researchers have investigated mass transfer in the liquid‐liquid slug flow using different sizes of capillaries .…”

Section: Introductionmentioning

confidence: 99%

The effect of the size of square microchannels on hydrodynamics and mass transfer during liquid‐liquid slug flow

Sattari-Najafabadi

Esfahany

Wu³

et al. 2017

AIChE Journal

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The present study investigated the influence of square microchannel (MC) size on hydrodynamics and mass transfer in the liquid‐liquid slug flow regime. Three square MCs with the hydraulic diameters of 200, 400, and 600 μm were used. The employed method for estimating mass‐transfer coefficients remarkably increased the accuracy of the results. The findings revealed that decreasing the MC size improved the interfacial area due to plug length enlargement and deteriorated mass‐transfer resistances because of augmented internal circulations, leading to the considerable enhancement of mass‐transfer coefficients. The increasing effect on the overall mass‐transfer coefficient became greater with flow velocity, showing that size effect on mass‐transfer resistances was more profound at higher flow velocities. The influence of size on the interfacial area was significantly greater than that on mass‐transfer resistances due to the significant increment of wall film length with the decrease in channel size. © 2017 American Institute of Chemical Engineers AIChE J, 2017

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Influence of silica nanoparticles on mass transfer in a membrane-based micro-contactor

Abstract: Experiments were performed in a membrane based micro-contactor The results showed that nanoparticles are more effective on mass transfer at lower flow rates.

Cited by 16 publications

References 57 publications

Diffusiophoretic enhancement of mass transfer by nanofluids

Diffusiophoretic enhancement of mass transfer by nanofluids

A critical review on the use of nanoparticles in liquid–liquid extraction

The effect of the size of square microchannels on hydrodynamics and mass transfer during liquid‐liquid slug flow

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