THE DIELECTRIC CONSTANT OF ETHYL CHLORIDE ADSORBED ON POROUS SILICA GLASS TREATED TO REMOVE SILANOL GROUPS

Abstract

The real and imaginary parts of the complex dielectric constant of the composite system ethyl chloride adsorbed on porous glass have been determined over a range of temperature, namely −20 to −190 °C in the frequency range 1 000 to 4 000 Mc/s. The porous glass was treated to remove the majority of the silanol groups. The dielectric constants of the adsorbate are also reported. The major finding was that removal of the silanol groups eliminated the second linear section (of lower slope) of the usual plots. The behavior of the polar adsorbate is then shown to be quite similar to that of polar adsorbates on nonporous rutile. Loss curves as functions of frequency and temperature are given and discussed. There is insufficient evidence to discriminate between Debye-type loss and that of an oscillator or resonator.A method is given of obtaining the dielectric parameters from the standing wave data with greater accuracy than can be obtained from use of Von Hippel plots.