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The thickness of eCL (τeCL) as the criterion for effective extraction of microparticles of different sizes. The error bars are standard deviations. The flow rate of carrier oil emulsion and aqueous extracting solution varies from (I) 5, (II) 6, (III) 6.5, to (IV) 8 ml/h. The flow rate of alginate solution is 0.1 ml/h. For the scenario of shifted interface (I*), the flow rates for dispersed alginate, carrier oil, and extraction solution are 0.06, 6, and 12 ml/h, respectively.
