fig3

Figure 3. Laser-triggered decomposition chemistry and kinetics of DPI-HFP/Fe₃O₄ NPs/ Ecoflex 00-30 composites. (A) Infrared spectra of DPI-HFP/Fe₃O₄ NPs (1.00 wt.%)/Ecoflex 00-30, showing absorbance decrease in Si-CH₃ peak (792 cm^-1) and Si-O-Si peak (1,013 cm^-1) after laser-triggering (0.25 W, 20 min); (B) Solid-state ¹H-NMR T₂ distributions of the composite. T₂ relaxation time increased after laser-triggering (0.25 W, 20 min), indicating a decrease in the crosslinking density. Decomposition behaviors of the composite (C) for various Fe₃O₄ NPs concentrations (laser power = 0.25 W); and (D) at different laser powers (Fe₃O₄ NPs, 1.00 wt.%). The femtosecond pulsed laser (spot size = 8 mm (diameter), λ = 800 nm, pulse width = ~ 100 fs) was applied to the composites from a light source positioned 5 meters away in all cases. (C and D) Data are presented as mean ± SD of n = 3 independent measurements. NP: Nanoparticle; DPI-HFP: diphenyliodonium hexafluorophosphate; NMR: nuclear magnetic resonance; SD: standard deviation.