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. 2021 Jun 19;12(6):723. doi: 10.3390/mi12060723

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Schematics of the microfluidic device used for preparing “cup-shaped” microparticles capable of encapsulating oil cores. The initial double emulsion droplets gradually formed an open hollow structure due to phase separation. (b) Optical microscopic images of “cup-shaped” microparticles. (b1) Optical microscopic image showing good monodispersity and uniform size and shape of microparticles; (b2) Magnified image showing the open hollow structure of the microparticle with an oil core. Silicone oil was dyed red. The scale bar is 200 µm.