GAS-PHASE NUCLEATION CORE ELECTRODES FOR THE ELECTROLYTICAL METHOD OFMEASURING THE DYNAMIC SURFACE-TENSION IN AQUEOUS-SOLUTIONS

The design and operation of a new type of single nucleation site elect rode, the gas phase nucleation core (GPNC) electrode, is described in this paper. The GPNC is basically an artificial Harvey nucleus which i s made on a microelectrode. It is experimentally shown that it is poss ible to generate monosized gas bubbles with a periodical evolution by this method. The gas bubble evolution process is monitored electricall y by means of overpotential and impedance measurements as well as opti cally observed. It is concluded that a possible use of the devices cou ld be as a surfactant concentration sensor.