Figure 3.

Fracture surface micrographs of a unmodified-silica/PAI composites; b 1.0 wt%CTAB-silica/PAI composites; c 2.0 wt%CTAB-silica/PAI composites; d 3.0 wt%CTAB-silica/PAI composites

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