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(a) Bright-field microscopy image of the spray-dried HPMCAS NP powders (mass ratio of NP:HPMC E3 = 1:2). Inset: Scanning electron microscopy image of the powders. (b) Size distribution of the HPMCAS NP suspension before SD and the aqueous suspension after reconstituting spray-dried powders with DI water, for different mass ratios between NPs and HPMC E3 in the SD process.
