Towards controlled liquid–liquid microextraction

Lohse, Detlef

doi:10.1017/jfm.2016.421

Cited by 24 publications

(25 citation statements)

References 11 publications

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“…Finally, it is worth mentioning that the history effect is naturally present in the evaporation of multicomponent drops. Chu & Prosperetti (2016a) have recently developed a formulation that includes a memory integral to describe the diffusion-driven dynamics of multicomponent drops in the presence of a solvent, a phenomenon of relevance in modern techniques of chemical analysis (Lohse 2016). In this problem, the faster or slower dissolution of one of the components yields a time-varying composition at the drop's interface, which makes the inclusion of the history integral in Fick's law essential, even when the ambient pressure remains constant.…”

Section: Introductionmentioning

confidence: 99%

The history effect on bubble growth and dissolution. Part 2. Experiments and simulations of a spherical bubble attached to a horizontal flat plate

et al. 2017

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The accurate description of the growth or dissolution dynamics of a soluble gas bubble in a super-or undersaturated solution requires taking into account a number of physical effects that contribute to the instantaneous mass transfer rate. One of these effects is the so-called history effect. It refers to the contribution of the local concentration boundary layer around the bubble that has developed from past mass transfer events between the bubble and liquid surroundings. In Part 1 of this work (Peñas-López et al. 2016b), a theoretical treatment of this effect was given for a spherical, isolated bubble. Here, Part 2 provides an experimental and numerical study of the history effect regarding a spherical bubble attached to a horizontal flat plate and in the presence of gravity. The simulation technique developed in this paper is based on a streamfunction-vorticity formulation that may be applied to other flows where bubbles or drops exchange mass in the presence of a gravity field. Using this numerical tool, simulations are performed for the same conditions used in the experiments, in which the bubble is exposed to subsequent growth and dissolution stages, using step-wise variations in the ambient pressure. Besides proving the relevance of the history effect, the simulations highlight the importance that boundary-induced advection has to accurately describe bubble growth and shrinkage, i.e. the bubble radius evolution. In addition, natural convection has a significant influence that shows up in the velocity field even at short times, though, given the supersaturation conditions studied here, the bubble evolution is expected to be mainly diffusive.

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Section: Introductionmentioning

confidence: 99%

The history effect on bubble growth and dissolution. Part 2. Experiments and simulations of a spherical bubble attached to a horizontal flat plate

et al. 2017

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“…Recent theoretical work on this subject by Chu & Prosperetti (2016) showed the importance of the proper formulation of dissolution and growth dynamics for a multicomponent drop. Lohse (2016) also highlighted the importance of their result for various applications in chemical technology, and in particular towards controlled liquid-liquid micro-extraction. Although the present study addresses the multicomponent droplet dissolution in a bulk liquid, our system shares similarity with the evaporation of a sessile droplet in air or the dissolution of a sessile droplet in another liquid, which further enhances the relevance of this study (Kneer et al 1993;Tamim & Hallett 1995;Brenn et al 2007;Dietrich et al 2016;Tonini & Cossali 2016).…”

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confidence: 99%

Molecular dynamics study of multicomponent droplet dissolution in a sparingly miscible liquid

et al. 2017

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The dissolution of a multicomponent nanodrop in a sparingly miscible liquid is studied by molecular dynamics (MD) simulations. We studied both binary and ternary systems, in which nanodroplets are formed from one and two components, respectively. Whereas for a single-component droplet the dissolution can easily be calculated, the situation is more complicated for a multicomponent drop, as the interface concentrations of the drop constituents depend on the drop composition, which changes with time. In this study, the variation of the interface concentration with the drop composition is determined from independent 'numerical experiments', which are then used in the theoretical model for the dissolution dynamics of a multicomponent drop. The MD simulations reveal that when the interaction strengths between the drop constituents and the surrounding bulk liquid are significantly different, the concentration of the more soluble component near the drop interface may become larger than in the drop bulk. This effect is the larger the smaller the drop radius. While the present study is limited to binary and ternary systems, the same method can be easily extended to a larger number of components.

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“…Most often, these processes involve multicomponent drops and thus the dissolution rate of multicomponent droplets is relevant in designing the equipment and operating conditions of these chemical processes [23][24][25]. One such example is liquid-liquid microextraction, where a particular component is extracted from the bulk liquid by dispersing a micro-or nanodrop having a very high solubility for that component [26].…”

Section: Nanobubbles and Nanodropsmentioning

confidence: 99%

“…Recent theoretical work on this subject by Chu and Prosperetti [136] showed the importance of the proper formulation of dissolution and growth dynamics for a multicomponent drop. Lohse [26] also highlighted the importance of their result for various applications in chemical technology and in particular towards controlled liquid-liquid micro-extraction. Although the present study addresses the multicomponent droplet dissolution in a bulk liquid, our system shares similarity with the evaporation of a sessile droplet in air or the dissolution of a sessile droplet in another liquid, which further enhances the relevance of this study [68,[137][138][139][140].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of Nanobubbles and Nanodrops

Maheshwari¹

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Towards controlled liquid–liquid microextraction

Cited by 24 publications

References 11 publications

The history effect on bubble growth and dissolution. Part 2. Experiments and simulations of a spherical bubble attached to a horizontal flat plate

The history effect on bubble growth and dissolution. Part 2. Experiments and simulations of a spherical bubble attached to a horizontal flat plate

Molecular dynamics study of multicomponent droplet dissolution in a sparingly miscible liquid

Molecular dynamics simulations of Nanobubbles and Nanodrops

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