Curvature dependency of surface tension in multicomponent systems

Santiso, Erik E.; Firoozabadi, Abbas

doi:10.1002/aic.10588

Cited by 32 publications

(18 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The last equation is again formally close to the Tolman equation, 48,49,50 originally derived for finite size objects such as clusters or droplets.  can be then considered as being equal or proportional to the Tolman length with the same temperature dependence.…”

Section: F(r) At Constant Temperature T Is Shown Insupporting

confidence: 53%

Simple Phenomenological Model for Phase Transitions in Confined Geometry. 2. Capillary Condensation/Evaporation in Cylindrical Mesopores

et al. 2009

View full text Add to dashboard Cite

Abstract. A simple phenomenological model that describes capillary condensation and evaporation of pure fluids confined in cylindrical mesopores is presented. Following the work of Celestini (Phys. Lett. A, 1997, 228, 84), the free energy density of the system is derived using interfacial tensions and a corrective term that accounts for the interaction coupling between the vapor/adsorbed liquid and the adsorbed liquid/adsorbent interfaces. This corrective term is shown to be consistent with the Gibbs adsorption isotherm and assessed by standard adsorption tests. This model reveals that capillary condensation and evaporation are metastable and equilibrium processes respectively, hence exhibiting the existence of a hysteresis loop in adsorption/desorption isotherms that is well known in experiment. We extend the phenomenological model of Celestini to give a quantitative description of adsorption on the pore wall and hysteresis width evolution with temperature and confinement.Direct quantitative comparison is made with experimental data for confined argon. Used as a characterizing tool, this integrated model allows in a single fit of an experimental adsorption/desorption isotherm assessing essential characterization data such as the specific surface area, pore volume, and mean pore size.

show abstract

Section: F(r) At Constant Temperature T Is Shown Insupporting

confidence: 53%

Simple Phenomenological Model for Phase Transitions in Confined Geometry. 2. Capillary Condensation/Evaporation in Cylindrical Mesopores

et al. 2009

View full text Add to dashboard Cite

show abstract

“…We used 2δ = σ for the Tolman length; such a Tolman length is consistent with the typical values reported in the literature which range from 1 up to a few Å (Santiso and Firoozabadi 2005). Interestingly, the predictions for the modified Kelvin equation for the adsorption and desorption branches are identical.…”

Section: Adsorptionmentioning

confidence: 58%

Molecular simulation of adsorption and intrusion in nanopores

et al. 2008

View full text Add to dashboard Cite

International audienceThis paper reports Monte Carlo simulations of the adsorption (wetting fluid) or intrusion (non-wetting fluid) in cylindrical silica nanopores. All the pores are opened at both ends towards an external bulk reservoir, so that they mimic real materials for which the confined fluid is always in contact with the external phase. This realistic model allows us to discuss the nature of the filling and emptying mechanisms that are observed in the experiments. The adsorption corresponds to the metastable nucleation of the liquid phase, starting from a partially filled pore (a molecular thick film adsorbed at the pore surface). On the other hand, the desorption occurs through the displacement at equilibrium of a gas/liquid hemispherical interface (concave meniscus) along the pore axis. The intrusion of the non-wetting fluid proceeds through the invasion in the pore of the liquid/gas interface (convex meniscus), while the extrusion consists of the nucleation of the gas phase within the pore. In the case of adsorption, our simulation data are used to discuss the validity of the modified Kelvin equation (which is corrected both for the film adsorbed at the pore surface and for the curvature effect on the gas/liquid surface tension)

show abstract

“…The supercooling dif ference observed between bulk and microsized NPG can be explained by classical nucleation theory [17,18]. The supercooling dif ference observed between bulk and microsized NPG can be explained by classical nucleation theory [17,18].…”

Section: Phase Change Behavior Of Npg Pcm Microcapsulesmentioning

confidence: 99%

Synthesis and Characterization of Solid-State Phase Change Material Microcapsules for Thermal Management Applications

Cao

Yang

2013

Journal of Nanotechnology in Engineering and Medicine

View full text Add to dashboard Cite

Polyalcohols such as neopentyl glycol (NPG) undergo solid-state crystal transformations that absorb!release significant latent heat. These solid-solid phase change materials (PCM) can be used in practical thermal management applications without concerns about liquid leakage and thermal expansion during phase transitions. In this paper, microcapsules of NPG encapsulated in silica shells were successfully synthesized with the use o f emulsion techniques. The size o f the microcapsules range from 0.2 to 4 pm, and the thickness of the silica shell is about 30 nm. It was found that the endothermic phase transition of these NPG-silica microcapsules was initiated at around 39 °C and the latent heat was about 96.0 Jig. A large supercooling of about 43.3 °C was observed in the pure NPG particles without shells, while the supercooling of the NPG microcapsules was reduced to about 14 °C due to the heterogeneous nucleation sites provided by the silica shell. These NPG microcapsules were added to the heat transfer fluid PAO to enhance its heat capacity and the effective heat capacity of the fluid was increased by 56% with the addition o f 20 wt. % NPG-silica microcapsules.

show abstract

Curvature dependency of surface tension in multicomponent systems

Cited by 32 publications

References 22 publications

Simple Phenomenological Model for Phase Transitions in Confined Geometry. 2. Capillary Condensation/Evaporation in Cylindrical Mesopores

Simple Phenomenological Model for Phase Transitions in Confined Geometry. 2. Capillary Condensation/Evaporation in Cylindrical Mesopores

Molecular simulation of adsorption and intrusion in nanopores

Synthesis and Characterization of Solid-State Phase Change Material Microcapsules for Thermal Management Applications

Contact Info

Product

Resources

About