(a)
(b)
(c)
(d)
(e)
(f)
Figure 5: SEM photographs of spherical nano-SiO2 coated fabrics’ surface microstructures. (a) Mass percentage of spherical nano-SiO2 is 0%; (b) mass percentage of spherical nano-SiO2 is 3%; (c) mass percentage of spherical nano-SiO2 is 6%; (d) mass percentage of spherical nano-SiO2 is 9%; (e) mass percentage of spherical nano-SiO2 is 12%; (f) mass percentage of spherical nano-SiO2 is 15%.