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(A) Scanning electron micrograph of a FluidFM tipless microchanneled cantilever with a 2-μm circular opening at the end. A spherical colloid can be attached to the aperture by underpressure in two ways: (B) the colloid is grabbed from a separate reservoir and transferred to the target substrate; and (C) the bead is picked up directly from the substrate. In both cases the colloid is released after use by a short pressure pulse.
