Self-Condensation Of Charged Colloidal Particles At Glass-Water Interface (In Japanese)

Charged colloidal particles near a like-charged glass surface in pure water were observed with a confocal laser scanning microscope. The particle concentration within 50 micron from the glass surface was found to be more than two times as high as in the interior of dispersion. Since the condensation phenomenon was observed only in deionized dispersions and the particle concentration in the denser region became higher with the number of charges on glass and particle surfaces, it was suggested that the driving force for the condensation of particles was an electrostatic attraction between the like-charged glass plate and particles though such an attraction is not explicable by conventional theories.