237828.fig.005a
(a)
237828.fig.005b
(b)
237828.fig.005c
(c)
237828.fig.005d
(d)
237828.fig.005e
(e)
237828.fig.005f
(f)
237828.fig.005g
(g)
237828.fig.005h
(h)
237828.fig.005i
(i)
237828.fig.005j
(j)
Figure 5: Variation of the morphology of the samples with hydrothermal reaction time Precursor: (a)–(e): commercial CaSO4·2H2O, (f)–(j): active CaSO4·2H2O; Time (h): (a), (f) 0.5; (b), (g) 1.0; (c), (h) 2.0; (d), (i) 3.0; (e), (j) 4.0.