Journal
LAB ON A CHIP
Volume 14, Issue 10, Pages 1733-1745Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3lc51363g
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Funding
- European Research Council [291211]
- Federal Ministry of Research (BMBF) [05K13WC5]
- European Research Council (ERC) [291211] Funding Source: European Research Council (ERC)
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We present microfluidic chip based devices that produce liquid jets with micrometer diameters while operating at very low flow rates. The chip production is based on established soft-lithographical techniques employing a three-layer design protocol. This allows the exact, controlled and reproducible design of critical parts such as nozzles and the production of nozzle arrays. The microfluidic chips reproducibly generate liquid jets exiting at perfect right angles with diameters between 20 mu m and 2 mu m, and under special circumstances, even down to 0.9 mu m. Jet diameter, jet length, and the domain of the jetting/dripping instability can be predicted and controlled based on the theory for liquid jets in the plate-orifice configuration described by Ganan-Calvo et al. Additionally, conditions under which the device produces highly reproducible monodisperse droplets at exact and predictable rates can be achieved. The devices operate under atmospheric and under vacuum conditions making them highly relevant for a wide range of applications, for example, for free-electron lasers. Further, the straightforward integration of additional features such as a jet-in-jet is demonstrated. This device design has the potential to integrate more features based on established microfluidic components and may become a standard device for small liquid jet production.
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