126567.fig.004a
(a)
126567.fig.004b
(b)
Figure 4: SEM morphologies on the fracture surfaces of mold samples through process II as a function of SiO2 precursor: (a) TEOS and (b) PDMS. Each number indicates SEM morphologies before and after the heat treatment, respectively. Dotted and solid arrows indicate the crack created (series-1) and glass phase formed (series-2) in mold samples, respectively.