Fig. 2. TEM images and particles sizes distributions of the samples prepared by varying the volume ratios of AN/TBP: (A) 1 : 6, (B) 1 : 5, (C) 1 : 4, (D) 1 : 3, (E) 1 : 2, (F) 1 : 1. Conditions: 1 ml AN containing 1 mg AIBN, reaction time of 2 h at 70 degrees. Size distribution (inset of A, B, C, D, E, and F).