Dielectric Properties of Liquid Surface Zones, II. The Monohalogenobenzenes in Thin Layers Between Platinum‐Iridium Plates

Abstract

AbstractThe dielectric constant of thin layers of fluid monohalogenobenzenes (fluoro‐, chloro‐, and bromobenzene) between two condenser plates made of a platinum‐iridium alloy, was measured at 105 cps. A remarkable decrease of the dielectric constant was found chiefly in small temperature ranges about 30–40° above the melting point which proved to be ranges of structural transition. At these temperatures monohalo‐genobenzene layers exhibit also a disjoining pressure and an altered viscosity, respectively. For fluoro‐ and chlorobenzene the dielectric anomalies in boundary layers seem to prevail down to lower temperatures. This phenomenon is explained by a cooperative long‐range structuring of the liquid near the metal surface.