451984.fig.004a
(a)
451984.fig.004b
(b)
451984.fig.004c
(c)
451984.fig.004d
(d)
Figure 4: FESEM photographs of samples. (a) PCSH: 110°C; (b) PCSH: 140°C; (c) PCSH: 170°C; (d) PCSH: 200°C.