Abstract
A brief description is given of an apparatus capable of recording both the short-time fluctuation spectroscopy and the long-time scattering intensities from sols. The system allows application of pulsed electric fields so that electrophoretic mobilities (u) can be recorded with ease and speed. Using this system, measurements have been made on sols of Stober-type silica spheres. A novel theory and procedure for evaluating size distributions from combined fluctuation and intensity data has been tested with success. Measurements of u were made as a function of pH. The use of scattering experiments for the characterisation of surface charge is mentioned.
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