Fig. 6.

PSI mechanical testing and microstructure of PSIs. The mechanical properties of placebo PSI tablets (10 mm diameter) fabricated with various compression forces (0.5, 1, and 1.5 US.ton) were evaluated. (A) Fracture strength of placebo PSIs measured using a three-point bending test with a 35 N load cell and at 0.05 mm/s displacement rate until fracture. (B) Young's modulus of PSIs calculated from the three-point bending compression test stress/strain slopes. Statistical analysis: ANOVA with Tukey's multiple comparisons tests, **p < 0.01. C) SEM images representing cross-section images of placebo PSIs fabricated with varying compression forces.