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TEM images of the Fe3O4 particles obtained using different CTAB concentrations: (a) 0 mol/L; (b) 0.034 mol/L; (c) 0.068 mol/L; (d) 0.102 mol/L; and (e) 0.136 mol/L (temperature = 200°C, time = 12 h). TEM – Transmission electron microscope; CTAB – Cetyltrimethyl ammonium bromide
