Load-indentation depth curve of the composite and SEM image of the indentation-induced microcrack. (a) Load-indentation depth curve of the (PE/TiO2)4 nanolayered composite measured by nanoindentation. (b) SEM image showing that indentation-induced microcrack advanced into the (PE/TiO2)4 nanolayer-coated region, by which fracture toughness of the nanocomposite can be obtained.
Zhang et al. Nanoscale Research Letters 2013 8:44 doi:10.1186/1556-276X-8-44