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Microsphere fabrication via (a) emulsion-solvent extraction and (b) precision particle fabrication (PPF) methods. (a) The major steps in an emulsion-solvent extraction method along with its several variations: (i) single emulsion, (ii) double emulsion, and (iii) cryopreparation. (b) Schematic of a PPF setup consisting of a custom-designed dual nozzle (expanded view shown on the right) and an acoustic excitation device.
