Keywords :
Droplet arrays; Droplet microfluidics; Pneumatic valves; Complex workflows; Flow features; Hydrodynamic resistance; Microfluidic droplets; Multiple interactions; On chips; Pneumatic valve; Single-cell level; Electronic, Optical and Magnetic Materials; Condensed Matter Physics; Materials Chemistry
Abstract :
[en] Microfluidic droplet arrays potentially allow to carry out assays involving complex workflows at the single-cell level. In recent developments [e.g. (Jeong et al. in Lab Chip 16:1698, 2016)], each droplet of the array can be addressed individually thanks to on-chip pneumatic valves. In this experimental and theoretical work, we investigate the multiple interaction regimes between one or several droplets and a pneumatic valve. In particular, two main trapping modes are characterized, with very distinct flow features. We quantify the potentially huge increase of hydrodynamic resistance induced by the droplet/valve interaction. Finally, we rationalize the main transitions between trapped and non-trapped regimes through a generic theoretical model of the balance between capillary, hydrodynamic and elastic forces.
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