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Characterization of droplet generation. (a) Representative image of a falling droplet, (b) tracked centers of 75 falling droplets.
Fresnel-corrected transmission spectrum through a thick layer of the used ink.
Schematic setup for the photophoretic manipulation of droplets. (Left) top view with two perpendicular microscopes centered around the inkjet cartridge, (right) side view of cartridge, and shielding glass cuvette allowing for a reproducible droplet trajectory illustrated with a streak series of traced droplet centers. C: cuvette, CL: cylindrical lens, DM: dichroic mirror, F: longpass filter, IC: inkjet cartridge, L: lens, LED: light-emitting diode, M: mirror, MO: microscope objective.
Photophoretic manipulation of absorbing droplets. (a) Tracked centers of 75 droplets falling through a light sheet with a peak intensity of µW µm−2, (b) tracked centers of 75 droplets repelled by a light sheet of µW µm−2 (cf. also movie 1), (c) side view showing the axial movement of repelled droplets (cf. also movie 2), the light sheet is visualized with a normalized image of the averaged scattered light from an aerosol of solid particles, the inset schematically illustrates the two acting force components (enhanced online). [URL: http://dx.doi.org/10.1063/1.4755761.1] [URL: http://dx.doi.org/10.1063/1.4755761.2]10.1063/1.4755761.110.1063/1.4755761.2
Photophoretic trampoline with a total intensity of 1.8 W. (a) Transverse bouncing of airborne droplets towards the left off a light sheet with inclination angle , (b) manipulation towards the right with a light sheet inclination of , (c) multiple droplet bouncing off a light sheet (cf. also movie3) (enhanced online). [URL: http://dx.doi.org/10.1063/1.4755761.3]10.1063/1.4755761.3
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