Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Physicochemical Studies on Cobalt Salts of Higher Fatty Acids. VIII. Some Rheological Properties of Solutions of Cobalt Soaps. Specific Viscosities and Non-Newtonian Flow
Hirotaro Kambe
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1962 Volume 35 Issue 2 Pages 269-273


The specific viscosity of dilute solution of cobalt stearate in benzene has been measured. Intrinsic viscosities are 3.13 for red soap and 1.81 for blue soap. The specific viscosity of benzene solution is decreased markedly by the addition of a small amount of ethanol, owing to the subsequent decrease of solubility.
The non-Newtonian flow behavior of solutions in xylene, benzene, n-heptane and toluene are shown. At higher concentrations, in particular in xylene, these solutions are Bingham plastic. In benzene and n-heptane, flow curves with different concentrations are consistent with a flow curve of Newtonian behavior, which corresponds to that of a throughout this work, and to Messrs. Minoru saturated solution in benzene. In toluene, flow curves are scattered, possibly due to the the experiments, blockage of the capillary by a piece of gel.
Different flow curves are sometimes obtained with capillaries of different bores, owing to slippage at the wall. An antithixotropic flow curve was obtained in some solutions.

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