Vapor–liquid nucleation: the solid touch

Yarom, Michal; Marmur, Abraham

doi:10.1016/j.cis.2014.07.011

Cited by 23 publications

(30 citation statements)

References 34 publications

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“…Homogeneous and heterogeneous nucleation Nucleation process may occur with or without contact with a solid surface or another chemical species [31] . When there is no involvement of any other phase or chemical species, nucleation is referred to as Љhomogeneous nucleationЉ (Fig.9A), instead when there is contact with another phase or chemical species, the process is referred to as Љheterogeneous nucleationЉ.…”

Section: Model and Resultsmentioning

confidence: 99%

Mechanism of Liquid-Phase Adsorption and Desorption in Coalbed Methane Systems - A New Insight into an Old Problem

Li³

et al. 2015

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Coalbed methane (CBM) recovery is a process of desorption rather than adsorption. Traditional experimental studies of methane adsorption/desorption on moist coal samples illustrate that, there is little hysteresis between adsorption and desorption processes, and these two behavior could be described by Langmuir equation. However, it is widely believed that coal porosity is normally occupied by water, and few researches focus on the gas sorption mechanism in condition of pore systems saturated with water. In this condition, there is an equilibrium between methane molecular dissolution into pore water and adsorption on (or desorption from) pore surface. And it is a typical liquid-solid internal interaction rather than gas-solid internal interaction.This paper presents experiments with methane adsorption/desorption on coal samples saturated with water and illustrates the significant difference between liquid-solid adsorption and gas-solid adsorption. In this work, we carry out three sets of experiments with coal samples immersed in water, and the equilibrium pressure is Pϭ5.445 MPa, 5.220 MPa and 2.965 MPa respectively. Subsequently, we conduct desorption experiments based on the former adsorption experiments to simulate the production process in aqueous environment with decreasing pressure. During desorption process, we are surprised to find that desorption amount changes slightly with different pressure drops, and desorption ratio for four sets of experiments is only 3.36%, 4.98% and 4.21% respectively. This dramatic results indicate that the desorption amount from saturated aqueous solution is not sensitive to pressure, which differs considerably from gas-phase desorption case.Furthermore, we analyze the Gibbs free energy change during adsorption/desortion processes in these two different systems: gas-solid and liquid-solid interface systems. It should be noted that, in an ideal gas-solid interface system (such as adsorption/desortion on flat surface case without the effect of pore structure), the Gibbs free energy change in adsorption are approximately equal to that in desortion processes, thus, the phase transition between absorbed layer and bulk is quasi-reversible, and no hysteresis exist in these two processes. However, in the liquid-solid interface system, due to the additional energy consumed by nucleation, it requires more energy for unit molar of methane during desorption process than adsorption process, which indictes that adsoption/desorption of liquid-solid interface are unreversible. Based on this theory, we established a hysteretic model to describe the hysteresis phenomenon during adsoption/desorption from aqueous environment, and this model can be perfectly verified by our experiment results.Our result demonstrates that the process of the methane desorption from micropores under water saturated condition is hysteretic seriously. This meaningful finding indicates that when almost no free gas exists in matrix pores, i.e., only absorbed gas and dissolved gas exist, and adsorbed gas almost cannot deso...

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Section: Model and Resultsmentioning

confidence: 99%

Mechanism of Liquid-Phase Adsorption and Desorption in Coalbed Methane Systems - A New Insight into an Old Problem

Li³

et al. 2015

All Days

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“…While the assessment of multilayer adsorption at moderate humidities is still debated in planar systems, the situation becomes even more complex in convoluted surfaces [3,102,103] like those in particulate media. Water film thickness may increase on corrugated surfaces in a manner not attributable to capillary condensation at the asperities.…”

Section: Wetting Film Thicknessmentioning

confidence: 99%

“…Indirectly, the abovementioned influence of moisture in the mechanical properties of granular materials (sand, micrometer spheres packings) indicates formation of a significant number of capillary bridges, even at 10% RH [111], though the expected adsorption or capillary condensation cannot account for them. Indeed, increased vapor condensation arising from the proximity of neighboring surfaces and enhanced adsorbate-adsorbant interactions [2,3,99,112] must be considered, especially in submicron particles systems as their interstices approach the 1-nm scale. In view of these facts, the unexpectedly large adsorption found in CCs seems to be related to a more general phenomenon in divided media, and it remains an open question.…”

Section: Wetting Film Thicknessmentioning

confidence: 99%

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Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Gallego-Gómez

Morales‐Flórez

Morales

et al. 2016

Advances in Colloid and Interface Science

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Solid colloidal ensembles inherently contain water adsorbed from the ambient moisture. This water, confined in the porous network formed by the building submicron spheres, greatly affects the ensemble properties. Inversely, one can benefit from such influence on collective features to explore the water behavior in such nanoconfinements. Recently, novel approaches have been developed to investigate in-depth where and how water is placed in the nanometric pores of self-assembled colloidal crystals. Here we summarize these advances, along with new ones, that are linked to general interfacial water phenomena like adsorption, capillary forces and flow. Waterdependent structural properties of the colloidal crystal give clues to the interplay between nanoconfined water and solid fine particles that determines the behavior of ensembles. We elaborate on how the knowledge gained on water in colloidal crystals provides new opportunities for multidisciplinary study of interfacial and nanoconfined liquids and their essential role in the physics of utmost important systems such as particulate media.

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“…Introduction. Capillary condensation is heterogeneous nucleation in nature [1][2][3][4][5][6][7]. For instance when two hydrophilic surfaces are in contact, a nano-liquid meniscus is capillary condensed and it is playing an important role in adhesion, modulating kinetic friction and inducing cloud formation [5][6][7].…”

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confidence: 99%

Generalization of the Kelvin equation for arbitrarily curved surfaces

Svintradze

2020

Physics Letters A

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Capillary condensation, which takes place in confined geometries, is the first-order vapor-toliquid phase transition and is explained by the Kelvin equation, but the equations applicability for arbitrarily curved surface has been long debated and is a sever problem. Recently, we have proposed generic dynamic equations for moving surfaces. Application of the equations to static shapes and modelling the pressure at the interface nearly trivially solves the generalization problem for the Kelvin equation. The equations are universally true for any surfaces: atomic, molecular, micro or macro scale, real or virtual, Riemannian or pseudo-Riemannian, active or passive.

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Vapor–liquid nucleation: the solid touch

Cited by 23 publications

References 34 publications

Mechanism of Liquid-Phase Adsorption and Desorption in Coalbed Methane Systems - A New Insight into an Old Problem

Mechanism of Liquid-Phase Adsorption and Desorption in Coalbed Methane Systems - A New Insight into an Old Problem

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Generalization of the Kelvin equation for arbitrarily curved surfaces

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