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SEM micrographs at different magnifications of magnetic PLGA encapsulated iron oxide NPs. (a)–(c) Noncryoprotected NPs freeze dried in pure DI water. Cracks seen are from the gold coating used for SEM visualization. (d) Cryoprotected NPs freeze dried in 2% dextrose, (e) 5% sucrose, and (f) 5% dextrose.
