EXPERIMENTAL STUDY OF THE ELECTRICAL DOUBLE LAYER IN VERY DILUTE AQUEOUS SOLUTIONS.
LOUISIANA STATE UNIV BATON ROUGE DEPT OF CHEMISTRY
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Two methods are described for the measurement of the double layer differential capacity in media of low conductivity, i.e. under conditions in which the conventional bridge method fails a measurement of the change of potential caused by coulostatic charging with a small excursion of potential b determination, under coulostatic conditions, of the time constant of the circuit comprising the double layer capacity in series with a large resistance. The first method is definitely the more convenient and slightly more accurate. Application is made to 0.001 to 0.00001 M sodium fluoride, and results agree with those calculated from the Gouy-Chapman theory for Grahames capacities of the compact double layer. The coulostatic method is compared with the bridge method and some potential applications are mentioned. Author
- Physical Chemistry