Abate, Adam R.Romanowsky, Mark B.Agresti, Jeremy J.Weitz, David A.2019-10-092009Abate, Adam R., Mark B. Romanowsky, Jeremy J. Agresti, and David A. Weitz. 2009. “Valve-Based Flow Focusing for Drop Formation.” Applied Physics Letters94 (2): 023503. https://doi.org/10.1063/1.3067862.0003-69511077-31181520-8842http://nrs.harvard.edu/urn-3:HUL.InstRepos:41511268Microfluidic devices can produce highly monodisperse drops at kilohertz rates using flow-focus drop formation. We use single-layer membrane valves to control, in real time, the dimensions of the flow-focus drop makers. This allows drop size and frequency to be controlled in real time and without adjusting flow rates.en-USJournal Article2019-10-0910.1063/1.3067862