1/fα noise in aqueous solutions of poly(ethylene oxide) in Couette flow

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Abstract
Current‐noise spectra have been determined for aqueous solutions of poly(ethylene oxide) subjected to different shear rates in a Couette‐type measuring cell. Different electrode arrangements did not influence the results obtained. The current noise had a 1/fα‐type frequency distribution, with the value of α depending on the shear rate, the molecular weight, and the concentration. At low shear rates, below 50 s−1, the current‐noise intensity was immeasurably small. In general, the degree of pseudoplasticity of the solutions was reflected in the noise intensity and the value of the exponent α; non‐Newtonian solutions give rise to a more intense noise. This tendency was expressed quantitatively in an inverse‐type relation between α and n, the exponent of the pseudoplasticity in the Ostwald‐deWaele power law of flow. The relation was slightly affected by the conditions of measurement. Newtonian solutions appeared to be associated with pure 1/f noise (α?1).

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