Accession Number : AD0631625

Title :   EXPERIMENTAL STUDY OF THE ELECTRICAL DOUBLE LAYER IN VERY DILUTE AQUEOUS SOLUTIONS.

Descriptive Note : Technical rept.,

Corporate Author : LOUISIANA STATE UNIV BATON ROUGE DEPT OF CHEMISTRY

Personal Author(s) : Delahay,Paul ; de Levie,Robert ; Giuliani,Anna-Maria

Report Date : FEB 1966

Pagination or Media Count : 12

Abstract : 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 Grahame's capacities of the compact double layer. The coulostatic method is compared with the bridge method and some potential applications are mentioned. (Author)

Descriptors :   (*ELECTRIC DOUBLE LAYER, MEASUREMENT), (*SODIUM COMPOUNDS, FLUORIDES), ELECTROCHEMISTRY, SOLUTIONS(MIXTURES), VOLTAGE, ELECTRICAL RESISTANCE

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE