摘要:

Experiments to determine the dielectric constants of adsorbed butane, ethyl chloride, and water on an activated silica at frequencies up to 3.7 Mc. per sec. are reported. No Debye-type dispersion was observed for the polar adsorbates down to −30 °C, the lowest temperature employed. Mixtures of ethyl chloride and water, and of butane and water, were also studied. The assumption that adsorption of ethyl chloride and water occurs with both adsorbates sharing two types of sites sufficed to explain the findings for this system. No explanation was apparent to account for the behavior of the butane–water system.Formulae due to Kurbatov and to Snelgrove and McIntosh have been used to interpret the results obtained with polar adsorbates. On the assumption that the adsorbates have densities equivalent to those for the liquid state at the same temperature, it is concluded that adsorbed water undergoes oscillatory motion. The first quantities of ethyl chloride adsorbed behave as though the molecules may rotate freely within an angle of 98°. The ethyl chloride adsorbed nearer the saturation pressure shows oscillatory motion, as a negligible temperature coefficient of the molar polarization is observed.

ISSN:0008-4042    

DOI:10.1139/v53-011

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

The orientational polarization of a polar molecule adsorbed on a solid surface is deduced for two cases. First, the molecule oscillates in the plane of the surface about some equilibrium position. A zero temperature coefficient of the polarization is deduced. Second, the molecule may rotate freely in the plane within some given angle, but cannot incline to any greater extent from the equilibrium position under the influence of the field. The normal temperature coefficient is obtained with this model.The derivation of these formulae is based upon the procedures of Kurbatov who considered oscillation and rotation to be possible in three dimensions. The models employed here are considered preferable on the grounds that a physically adsorbed polyatomic molecule would presumably lie flat in the plane of the adsorbing surface.

ISSN:0008-4042    

DOI:10.1139/v53-012

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

Potassium perchlorate crystals are decomposed by 50 kv. X rays. The main products of the primary decomposition are chlorate and chloride, but small amounts of unidentified oxidizing substances are also formed. The chlorate decomposes by a secondary reaction to chloride. These reactions are approximately of the first order. The average amount of X-ray energy absorbed by the salt per ClO4−ion decomposed is 19 ± 2 ev.

ISSN:0008-4042    

DOI:10.1139/v53-013

出版商:NRC Research Press    

年代:1953

数据来源: NRC

摘要:

not available

ISSN:0008-4042    

DOI:10.1139/v53-014

出版商:NRC Research Press    

年代:1953

数据来源: NRC