2006
DOI: 10.1063/1.2397023
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Microscale tipstreaming in a microfluidic flow focusing device

Abstract: A microfluidic flow-focusing device is used to explore the use of surfactant-mediated tipstreaming to synthesize micrometer-scale and smaller droplets. By controlling the surfactant bulk concentration of a soluble nonionic surfactant in the neighborhood of the critical micelle concentration, along with the capillary number and the ratio of the internal and external flow rates, we observe several distinct modes of droplet breakup. For the most part, droplet breakup in microfluidic devices results in highly mono… Show more

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Cited by 354 publications
(368 citation statements)
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“…Droplets in Figure 3c are formed in the geometry-controlled regime, because the shear stress exerted by the continuous phase is small compared to interfacial stress. 32 Under this regime, droplets grow in the collection tube until they occupy almost the entire cross section. To maintain the applied flow rate, a higher pressure is needed in the continuous phase stream in order to drive flow through a narrow gap between the tube wall and the droplet interface.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…Droplets in Figure 3c are formed in the geometry-controlled regime, because the shear stress exerted by the continuous phase is small compared to interfacial stress. 32 Under this regime, droplets grow in the collection tube until they occupy almost the entire cross section. To maintain the applied flow rate, a higher pressure is needed in the continuous phase stream in order to drive flow through a narrow gap between the tube wall and the droplet interface.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…This transition has been studied extensively. 17 Within the jetting regime droplet generation does no longer occur at the flow-focusing region, but the jet breaks up further downstream due to the Rayleigh-Plateau instability. 18 We built a microfluidic device exhibiting a wide cavity after the flow-focussing region and modified the microchannel with a PAH-PSS-PAH-PSS PEM.…”
Section: High-throughput Production Of O/w Microdropletsmentioning
confidence: 99%
“…This is however, not a general break-up mechanism and can mostly be attributed to the presence of impurities or a nonuniform surfactant distribution along the drop surface (14,15). Other break-up mechanisms have been described in literature, for instance when dealing with viscoelastic components (16,17) or when using microfluidic devices in which confinement effects become important (18,19). Here, however, we focus on bulk behavior of systems with Newtonian components.…”
Section: Ispersing One Fluid In a Second Immiscible Liquid Ismentioning
confidence: 99%