Permeation properties of PMMA and silica particles through MF membranes in dead-end mode

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This paper presents the permeation properties of monodispersed PMMA and silica particles with an average diameter of 150 and 200 nm, respectively, through MF membranes in dead-end mode under various conditions. In this study, it was elucidated that the zeta potential of the particle is one of the most essential factors in determinating the permeation properties of PMMA and silica particles through MF membranes; the larger repulsive force between the membrane and particles or between the particles themselves prevented the particles from adhering onto the membrane surface, resulting in keeping excellent permeation in the case of the silica particles. Furthermore, by conducting the permeation tests systematically under various experimental conditions, it was also indicated that it is important for keeping good permeation of particles to make the situation where the number of particles which access each pore per certain time is sufficiently small because particles cannot permeate through the membrane once the membrane is fouled by rejected particles.