Figure 3
From: Dynamic Magnetic Responsive Wall Array with Droplet Shedding-off Properties
The sequent images of motion of droplet on variable DMRWs.
a, b, Top view of droplet motion along opposite directions on variable DMRWs (Frame 1–3). The schematics of droplet motions are in Frame 4 of a, b, respectively. c, The relationship between volumes of droplets and tilt angles of wall array for directional driven of droplets. With the increase volume of droplet (~15 μL > volume > ~ 3 μL), the contact area increase that induces larger retention force to opposite the driven motion; Small droplet (~ 1 μL < volume < ~ 3 μL) on the DMRWs will pin between two or three DMRWs and adds the difficulty for driven. Smaller droplet (volume < ~ 1 μL) will pin between two DMRWs and fails in driven. The critical tilt angles are ranged from 17° to 55°. The limitation of driven volume ranges from 1 μL to 15 μL.
