He, KunyunCampo-Cortés, FranciscoGoral, MartynaLópez-León, TeresaGordillo Arias de Saavedra, José Manuel2024-05-222024-05-222019-12He, K., Campo-Cortés, F., Goral, M., López-León, T. y Gordillo Arias de Saavedra, J.M. (2019). Micron-sized double emulsions and nematic shells generated via tip streaming. Physical Review Letters, 4 (12), 124201. https://doi.org/10.1103/PhysRevFluids.4.124201.0031-90071079-7114https://hdl.handle.net/11441/158825Here we show that the so-called Confined Selective Withdrawal technique [Evangelio, Campo-Cortés, and Gordillo, J. Fluid Mech. 804, 550 (2016)] can be used to produce compound drops whose radii and thicknesses can be easily decreased down to length scales of the order of 5𝜇⁢m and even smaller. This method is based on the generation of a highly stretched thin coaxial jet of two immiscible fluids that flow inside a third bulk coflowing fluid under creeping flow conditions. The subsequent capillary breakup of such coaxial jet produces, in a single step, compound droplets at rates that can be easily modulated to values of the order of 10 KHz. Using algebraic equations deduced using slender body theory, we report that the production frequency, the diameter, and the shell thickness follow well-defined scaling laws, enabling us to generate, from millimeter-sized injection tubes, and in a highly controlled way, uniformly sized double emulsions with the smallest diameters reported to date. We illustrate our results by producing micron-sized nematic shells with radii below 5 microns and show that the radius of curvature of the surface and the shell thickness can be fixed independently.application/pdf17 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Drop breakupFlow of fluidsOstwald ripeninginfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1103/PhysRevFluids.4.124201