AN ELECTRIC FIELD EFFECT ON THE CRITICAL OPALESCENCE.
Technical rept. no. 9,
CORNELL UNIV ITHACA N Y
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The free energy involved in the concentration fluctuations of a liquid mixture is changed by an electric field. The effect becomes observable near the critical point. It increases with decreasing distance from the critical temperature and it is proportional to the square of the field intensity and to the second derivative of the dielectric constant with respect to the concentration. The effect can be interpreted as a shift of the critical temperature. Experiments performed with a field intensity of 45 000 Voltscm on the system nitrobenzene -2,2,4-trimethyl pentane give a value of .015 degrees for this shift, while the theory predicts .010 degrees. Also in good agreement with the theory is the dependence on the field intensity and on the temperature distance from the critical temperature. Author