Krypton adsorption on graphite pre-plated with dichloromethane

Abstract

Krypton adsorption on CH 2Cl 2 pre-plated graphite has been studied by means of volumetric measurements and diffraction experiments. When graphite is pre-plated with one CH 2Cl 2 monolayer, krypton adsorption at 80 and 85 K results in a partial displacement of CH 2Cl 2 and replacement by a krypton monolayer. This transition is followed by the incorporation of krypton in the remaining CH 2Cl 2 patches so as to form a 2D solution of defined composition. Lastly, krypton adsorbs on itself. When graphite is pre-plated with 0.5 CH 2Cl 2 monolayer, krypton adsorbs on the bare part of the surface before the composite layer becomes organized. When the surface is pre-saturated with CH 2Cl 2, the condensation of pure krypton patches is hindered to the benefit of the formation of a 2D solution all over the available surface area.