Abstract
AQUEOUS solutions of ammonium oleate are strongly elastic. If given a rotary motion and then allowed to come to rest, the rotation is in part retraced before they do so. In 1926, Hatschek and Jane1 examined these solutions in a Couette-type viscometer. They found, inter alia, that when the outer cylinder was rotated at a constant angular velocity, the torque on the inner one, after a short period of normal magnitude, increased to an irregularly fluctuating value many times greater. After a period of rest, the behaviour was repeated. It appeared that a gelatinous structure was actually built up by the process of shear, and dissipated again at rest. The subsequent discovery2 that the anomalous increase of torque was associated with the onset of turbulence distracted attention3 from this first conclusion. It seems probable, however, that the turbulence itself, also anomalous and of abnormal appearance2, was another result of the structure built up rather than the direct cause of the increased torque.
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Hatschek, E., and Jane, R. S., Koll. Z., 38, 33 (1926).
Andrade, E. N. da C., and Lewis, J. W., Koll. Z., 38, 260 (1926).
Hatschek, E., Koll. Z., 38, 259 (1926).
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HARTLEY, G. Negative Thixotropy. Nature 142, 161 (1938). https://doi.org/10.1038/142161a0
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DOI: https://doi.org/10.1038/142161a0
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