Abstract
The effect of particle size on ζ-potential was studied by the streaming potential method. The streaming potential was measured with varying particle size of untreated glass particles and glass particles coated with dodecylamine in sodium chloride or dodecylammonium chloride solution. These experiments showed that |ζ| became larger, the smaller the particle size was. Necessary corrections have to be made to obtain a reliable value of ζ-potential. The corrections for surface conductance, overlapping of electrical double layer, and radius effect were proposed by many authors experimentally and theoretically, but these do not seem to give reliable values. A corrected equation [numerical formula] was derived here, theoretically, with consideration of the tortuosity of liquid flow, qη, and the tortuosity of ion flux, qκ, but a reasonable value was not obtained.
