Does adsorption in a single nanogroove exhibit hysteresis?

Abstract

A simple fluid, in a microscopic capillary capped at one end, is studied by means of fundamental measure density functional. The model represents a single, infinitely long nanogroove with long-range wall-fluid attractive (dispersion) forces. It is shown that the presence or absence of hysteresis in adsorption isotherms is determined by wetting properties of the wall as follows: Above wetting temperature, $T_w$, appropriate to a single wall of the groove, the adsorption is a continuous process corresponding to a rise of a meniscus from the capped to the open end of the groove. For a sufficiently deep capillary the meniscus rise is shown to be a steep, yet continuous process taking place near the capillary condensation of a corresponding slit. However, for temperatures lower than $T_w$ the condensation exhibits a first-order transition accompanied by hysteresis of the adsorption isotherm. Finally, it is shown that hysteresis may occur even for $T>T_w$ as a consequence of prewetting on the side and bottom walls of the groove.

References in corpus (4)

• Geometry dominated fluid adsorption on sculptured substrates
• Critical Effects at 3D Wedge-Wetting
• Complete Wetting of Nanosculptured Substrates
• Covariance for Conic and Wedge Complete Filling

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• Edge contact angle and modified Kelvin equation for condensation in open pores
• Capillary condensation in one-dimensional irregular confinement
• Phase Field Simulation of Liquid Filling on Grooved Surfaces for Complete, Partial and Pseudo-partial Wetting Cases
• Filling and wetting transitions on sinusoidal substrates: a mean-field study of the Landau-Ginzburg model
• Phase behaviour of fluids in undulated nanopores
• Filling, depinning, unbinding: Three adsorption regimes for nanocorrugated substrates
• Scaling of wetting and pre-wetting transitions on nano-patterned walls
• The Influence of Intermolecular Forces at Critical Point Wedge Filling
• Continuous condensation in nanogrooves
• Critical effects and scaling at meniscus osculation transitions