563651.fig.001a
(a)
563651.fig.001b
(b)
563651.fig.001c
(c)
563651.fig.001d
(d)
Figure 1: SEM pictures of SPHC and SPHC particles. (a) SPHC, ×35 magnification; (b) SPHC, ×50 magnification; (c) SPHC particles, ×35 magnification; (d) SPHC particles, ×50 magnification.