非分極性電極を用いた矩形電気泳動速度測定装置

Abstract

This paper reports a modified electrophoresis apparatus by the microscopic method in the surface electrochemical study of flotation.After examining the apparatus with platinum electrodes in all its aspects, an acrylite new apparatus with non-polarizable calomel electrodes as the working electrodes so as to avoid polarization was designed and was proved satisfactory for use. Cell dimension was 2.108mm in depth, 19.87mm in width and 200mm in length, and electrophoresis was measured at the stationary level so that electroosmotic flow was zero. Field strength was measured by the vacuum tube voltmeter by putting the small calomel electrodes in the cell.By considering the theoretical equation on the electroosmotic flow in the cell, derived by Komagata, it was found that ratio of width to depth of the cell must be more than 5, and the deviation in the focusing point is discussed. Effects of the settling of particles during the mobility measurement and of particle size were also considered, and it was concluded that the former is negligible small when measured under the condition in which particles are observed within the focusing depth, and that the most suitable particle size is less than about 2μ in diameter.A mobility of -1.07μ/sec/V/cm in distilled water at 25°C was observed on the sphalerite sample and the calculated electrokinetic zeta potential was -14mV.