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A simple and precise size measurement device of microparticles in liquid has been developed by using a narrow gap between a cylindrical lens and a flat glass wall, in which the distance of the gap is precisely determined by the diffraction Moiré pattern of irradiated light. Two different methods to transfer the particles toward the center line of the lens, a hydrodynamic flow mode and an electrophoretic mode, have been established. By using these methods, simultaneous size-determination and size-separation of small amounts of micrometer and sub-micrometer sized polystyrene particles in water have been attained with high precision. Novel advantages of the cylindrical nano-gap method were demonstrated for different surface types of polystyrene particles.

Simple and Precise Size-Separation of Microparticles by a Nano-Gap Method