S S Bhatnagar
Articles written in Proceedings – Section A
Volume 6 Issue 3 September 1937 pp 155-157
Volume 9 Issue 1 January 1939 pp 86-94
Volume 9 Issue 2 February 1939 pp 143-158
Different samples of zinc and magnesium oleates were prepared by varying the amounts of the electrolyte and the monovalent soap. As a result of the analysis of the samples thus prepared, it is observed that the metal and the acid are not present in stoichiometric ratios except in the case of zinc oleate obtained by refluxing zinc dust and oleic acid. This sample of zinc oleate melts at 85·5° C. while the other samples melt at a much lower temperature. Similar behaviour is observed in the case of magnesium oleate. It has been suggested that these variations are due to the adsorption of various ions by the metal soaps formed.
A study of other physical properties such as solubility, molecular complexity, surface tension, viscosity, electric conductivity, and molecular magnetic rotation using benzene as solvent reveals that the behaviour of magnesium oleate is different from that of zinc oleate inasmuch as it shows conductivity, abnormally high molecular weight, comparatively higher viscosity, a greater lowering of interfacial tension and a variation of molecular magnetic rotation with change in concentration.
Riedel from a study of the viscosity of metal soaps concluded that these soaps could not be treated as colloidal electrolytes but that they behaved more like gels. The difference in behaviour of zinc and magnesium oleates, however, suggests that whereas zinc oleate may be regarded as a gel, magnesium oleate behaves more like a colloidal electrolyte.
Volume 10 Issue 1 July 1939 pp 45-54
Magnetic properties of dilute as well as concentrated amalgams have been investigated. It has been shown that when dilute amalgams are prepared by prolonged electrolysis at room temperature the diamagnetic susceptibilty of the amalgams prepared is lower than that calculated on the mixture law and the results are in line with those of Venkataramiah; but if the amalgams are prepared at low temperature, 0°C., within 4–5 hours or by grinding the components according to the method of Terry and Wright susceptibility value of the amalgams obeys the mixture law. This difference in the susceptibility has been explained by the authors, by suggesting the formation of paragmanetic oxides formed during prolonged electrolysis at high temperatures. Amalgams of higher concentrations prepared by grinding method, when fresh obey the mixture law but on keeping, even under vacuum, become less diamagnetic and the maximum difference, in susceptibility values between a fresh and an aged amalgam is observed in one which contains 34 per cent. copper. This is supposed to be due to the formation of compound.
Volume 10 Issue 3 September 1939 pp 150-155
Volume 10 Issue 6 December 1939 pp 468-476