Figure 5
From: Path-programmable water droplet manipulations on an adhesion controlled superhydrophobic surface
In situ manipulation of water droplet motions on the PDMS micro-pillar arrays for droplet-based microfluidic operations.
(a) A 10 μl moving water droplet follows the trace of a character “N” shape. Scale bar, 5 mm. (b) Droplet operations including transportation, merging and mixing on the superhydrophobic PDMS substrate. Scale bar, 5 mm. (c) Scheme of the SERS measurement system (top) and typical in situ/ex situ SERS analysis spectra with different concentrations of analyte (R6G), obtained from a droplet mixture of R6G/Ag NP and evaporated R6G/Ag NP droplet, respectively (bottom). (d) Scheme of the siRNA-lipidoid complex formation for in vitro transfection. (e) Fluorescent images (top) and flow cytometry analyses of GFP-HeLa cells two days after transfection (bottom). Scale bar, 200 μm (n = 3, **p < 0.01, compared to the conventional group).
