381235.fig.004a
(a)
381235.fig.004b
(b)
381235.fig.004c
(c)
381235.fig.004d
(d)
381235.fig.004e
(e)
381235.fig.004f
(f)
Figure 4: SEM images of AACH microfibers prepared with no surfactant: (a) PEG20000, (b) PEG2000, (c) SEM, and (e) TEM ((c), (d)) images of γ-Al2O3 microfibers prepared by calcination at 900°C for 2 h.