Preparation and Characterization of Nanosized Hematite Colloids Using Green Vitriol as Ferrum Source
Figure 5
The TEM photographs of the as-prepared samples at different pH values, which displayed the effect of pH values on the monodispersity of as-prepared samples. When the transformation reaction pH was set as 4 or 5, the products nanosized colloidal α-Fe2O3 had excellent monodispersity, but, with pH = 6 or 7, the flocs were observed.
