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SEM images of an unloaded silk fibroin aerogel (a,c) and aerogel loaded with ~21 wt% ibuprofen (b,d). Each set of images are for the same sample at two different magnifications [390]. Reprinted from The Journal of Supercritical Fluids, Michael A. Marin, Rajendar R. Mallepally, Mark A. McHugh, Silk fibroin aerogels for drug delivery applications, 84–89, Copyright 2014, with permission from Elsevier.
