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A simple fluid, in a microscopic capillary capped at one end, is studied bymeans 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 adsorptionisotherms is determined by wetting properties of the wall as follows: Abovewetting temperature, $T_w$, appropriate to a single wall of the groove, theadsorption is a continuous process corresponding to a rise of a meniscus fromthe capped to the open end of the groove. For a sufficiently deep capillary themeniscus rise is shown to be a steep, yet continuous process taking place nearthe capillary condensation of a corresponding slit. However, for temperatureslower than $T_w$ the condensation exhibits a first-order transition accompaniedby hysteresis of the adsorption isotherm. Finally, it is shown that hysteresismay occur even for $T>T_w$ as a consequence of prewetting on the side andbottom walls of the groove.

Does adsorption in a single nanogroove exhibit hysteresis?