413692.fig.004a
(a)
413692.fig.004b
(b)
413692.fig.004c
(c)
413692.fig.004d
(d)
Figure 4: The calculated particle size distribution of the TiO2 nanofibers. (a) As-spun nanofibers. (b)–(d) Fibers calcined in air for 3 h at 400, 600, 800, and 1,000°C, respectively.