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TEM images of various Fe-Fe3O4 (A) and hollow IONPs (B-E) after heating the seed Fe-Fe3O4 nanoparticles. (B) 130 °C for 1 h, (C)130 °C for 2 h, (D) 210 °C for 40 min, (E) 210 °C for 80 min, (F) 210 °C for 120 min. Reproduced with permission from 50, copyright 2007.
