Figure 1: Immersion/extract, dispensing, capturing single silicone droplet using the proposed 3D substrates.
From: Design and fabrication of a passive droplet dispenser for portable high resolution imaging system
(a1–a2) Shows the immersion process for extracting fixed fluid volume using the conic substrate and a reservoir of fluid. (b1–d1) Shows three different conic-droppers of angle 16.9°, 31.9° (Supplementary Video 1) and 58.3° (Supplementary Video 2) respectively. (b2) A dropper with slope 16.9° extracting a small amount of PDMS at the tip. (c2) and (d2) are droppers with slope 31.9° and 58.3° respectively that extracts a fixed volume of PDMS, a droplet hangs over the tip of each of cone dropper. (b3) A holder (1 mm thick) captures no droplet as cone dropper in (b2) did not dispense any droplets. (c3) and (d3) both collects a droplet from by the cone-droppers in (c2) and (d2). However, the droplet held in (d2) fails to capture the first droplet (supplementary video 3). Red dotted line indicates the angle, white dotted lines shows the position of the holder. All the images are on a scale bar of 1 mm.
