The magnetic study of some liquids adsorbed on a silicagel and aluminium oxide

Abstract

The authors carried out measurements of magnetic susceptibility of methylalcohol, toluene and benzene adsorbed on a silicagel, and methylalcohol, toluene and water on a cationotropic aluminium oxide, respectively. These measurements were performed under cover at ambient temperature and comparisons were made with the law of additivity in the whole range of concentration. With the exception of methylalcohol on Al₂O₃ all the other specimens provided distinct deviations from the linear dependence of the susceptibility on the percentage of the adsorbent's share i.e. within the scope of 0% to 40 upto 58% of the adsorbate in the specimen.

The measurements were completed by the results of experiments of high resolution proton magnetic resonance (NMR). In addition there were studies carried out by the method of NMR also concerning the adsorption of acetic acid on cationotropic and neutral Al₂O₂. Conclusions were made by the authors from the enumerated particulars concerning the interaction of the adsorbent and the adsorbates, with regard to the position of the molecules of the adsorbate on the surface of the solid phase, the share of precedent diamagnetism, Van Vleck's polarisation paramagnetism, the orientation paramagnetism of the adsorbent, the adsorbate, of chemically adsorbed groups, the free and bound adsorbates on the measured results.