Fig. 2. TEM images of CDs along with histograms showing the number of particles vs. size of particles. Images were taken: (a) within 1 week of synthesis of particles; (b) in the 7^th week after synthesis; (c) in the 47^th week; and (d) in the 58^th week. Corresponding histograms of images (a), (b), (c) and (d) are shown in (e), (f), (g) and (h), respectively. The total number of particles that were measured to plot the histograms were 383, 107, 610, and 166 for (e), (f), (g) and (h), respectively.