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- W1983669140 abstract "We introduce photophoretic velocimetry as a new technique for characterization of particulate matter on the basis of optical particle properties. Complementary to well-established techniques, we could show that, by measuring the photophoretic velocity of the single particles, it is possible to distinguish particles of different sizes as well as particles of one size but different refractive indices. The difference in photophoretic migration of particles can be applied to the separation of particles. Polystyrene, melamine, and SiO2 microparticles (0.3−10 μm) suspended in purified water were used as test samples for validation of a cross-flow setup. The particles were pushed perpendicular to a uniform, pulsation-free fluid flow by a focused He−Ne laser (λ = 633 nm, P = 47 mW, Imax = 14.0 kW cm-2) providing a well-defined Gaussian-shaped flux distribution. The migration behavior was observed by means of a video camera system, and the velocities and displacements were calculated by using an adapted particle imaging velocimetry code as an approach to automatic characterization. The photophoretic displacement depends on both flow conditions and particle properties and can be applied for separation means." @default.
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- W1983669140 date "2007-08-18" @default.
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- W1983669140 title "Photophoretic Velocimetry for Colloid Characterization and Separation in a Cross-Flow Setup" @default.
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- W1983669140 doi "https://doi.org/10.1021/ac070875x" @default.
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