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(a) Schematic setup for the investigation on anisotropic behavior of superparamagnetic nanoparticle on ratchet structured superhydrophobic surface under alternative magnetic field direction. Directions 1 and 2 are defined from N pole to S pole along or against ratchet orientation. The inset indicates the geometry of ratchet structure, where is the right angle, is the acute angle, and is the height of the ratchet. (b) Scanning electron microscopy (SEM) image of micro-/nanoporous structure on superhydrophobic surface in (a) (denoted with declining blue square). (c) Magnified SEM images PS microparticles in (b) (denoted with red square). Scale bars: (a) ; (b) .
The time-sequence high-speed CCD images of microdroplets moving on the flat surface (a) and ratchet structured superhydrophobic surfaces along directions 1 (b) and 2 (c), respectively. Scale bar: . Magnified images of -droplet which initially starts to move along magnetic field direction 1 (d) and 2 (e) vs illustrations (f) and (g), respectively. and are receding and advancing contact angles, respectively.
The thresholds are tuned by the feature parameter (, ) vs M-droplet volumes .
The thresholds are turned by superparamagnetic nanoparticle number vs the M-droplet volumes under the feature parameters and .
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