Fig. 3From: Nanoscale Effect of Zirconia Filler Surface on Mechanical Tensile Strength of Polymer CompositesTensile stress–strain curves for 30 wt% PNIPAM hydrogel composites with 0.02 wt% ZrO2 fillers. Composites with 0.02 wt% commercial ZrO2 (2b), with 0.02 wt% nano-concave-convex surface ZrO2 MARIMO (3), and with 0.02 wt% sintered ZrO2 MARIMO (4)Back to article page