Pressure-Driven droplet formation at a microfluidic T-junction. (IMAGE)
Caption
Pressure-Driven droplet formation at a microfluidic T-junction. a Schematic diagram of a T-junction microfluidic device used for droplet generation (not to scale). (i) Traditional approach: Water flows in the side channel, and the droplet is 'sheared off' by oil flow; (ii) This study: Oil is in the side channel, and the droplet is 'cut off' by an increase in oil flow pressure after traversing the T-junction. b Photograph of the T-junction microfluidic device. c Schematic diagram of the experimental setup. A Fluigent pressure pump is used for pressure adjustment. The total pressures of oil (Po) and water (Pw) at the oil and water reservoir are the sum of the hydrostatic pressure, ρOg∆hO and ρWg∆hW, and the applied pressure from the pump, Pw∗ and Po∗, respectively. Here, ρ, g and ∆h denote the density, gravitational acceleration and the height difference from the top of the liquid reservoir to the height of the microchip.
Credit
Microsystems & Nanoengineering
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CC BY