Accession Number : AD0724740

Title :   Physical Adsorption of Vapors.

Descriptive Note : Final scientific rept. Jun 66-Dec 70,

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMISTRY

Personal Author(s) : Adamson,Arthur W.

Report Date : 27 MAY 1971

Pagination or Media Count : 10

Abstract : The results of several series of investigations are reported. The nature of the ice-vapor interface has been studied at 77K, using nitrogen, argon, and carbon monoxide as adsorbates; at -80C, with ethane and with carbon dioxide; and at -30C to -40C, using n-pentane and n-hexane. At low temperatures, ice-surface is inert and non-polar; at higher temperatures bulk phase reaction may occur with small adsorbate molecules to form the ice clathrate compound; and with larger molecules, surface restructuring may occur. Other molecular solids were studied at 77K, and behave similarly to ice; the adsorbent-adsorbate dispersion interaction is very weak in these systems. Adsorption at the ice-liquid n-hexane interface has been studied. Contact angle data have been obtained for carbon disulfide on ice as a function of temperature. It is proposed that solid-liquid interfaces be classed as A or B in type, depending on whether restructuring of the solid surface occurs. An adsorption model has been developed relating adsorption isotherms to contact angle and spreading behavior. (Author)

Descriptors :   (*ICE, *ADSORPTION), HYDROCARBONS, NITROGEN, CARBON MONOXIDE, INTERFACES, VAPORS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE