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The different emulsion and phase separation methods. (a) Schematic of the fabrication of microspheres using single emulsion [47]. Copyright 2019, Elsevier B.V. All rights reserved. (b) Schematic of the fabrication of microspheres using double emulsion (W1/O/W2) [48]. Copyright 2022, Elsevier B.V. All rights reserved. (c) Schematic of the fabrication of the microspheres using the phase separation method and (i) SEM image of prepared microsphere. [35]. Copyright 2018, Elsevier Ltd.
