Figure 4.

Fracture surface micrographs of a pure PAI and silica/PAI nanocomposite with the amount of silica to PAI, b 2 wt%, c 4 wt%, d 6 wt%, e 8 wt%, f 10 wt%

Ma et al. Nanoscale Research Letters 2010 5:1846-1851   doi:10.1007/s11671-010-9726-7