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Example morphologies of aggregates of IONPs: (A) clusters, (B) porous core-shell spheres, (C) hollow spheres with a smooth surface, (D) hollow spheres with a rough surface, and (E) nanoflowers. (A) Reproduced with permission from 44, copyright 2017. (B) Reproduced with permission from 45, copyright 2010. (C) Reproduced with permission from 46, copyright 2008. (D) Reproduced with permission from 47, copyright 2015. (E) Reproduced with permission from 42, copyright 2011.
