Figure 2. FMR-induced magnetothermal decomposition principle and chemical analysis of the of the trigger transient magnetic field-responsive composite (IMAGE)
Caption
FMR-induced magnetothermal decomposition principle and chemical analysis of the of the trigger transient magnetic field-responsive composite
(A) Conceptual illustration of spin precession and relaxation under AC magnetic field, leading to heat dissipation via spin-lattice interactions.
(B) Sequential IR thermal images of the magnetic composite showing temperature increase induced by localized NPs heating under AC field application.
(C) Resonance map of microwave absorption (∣ΔS21∣) as a function of DC field strength (HDC) and AC field frequency (fAC). Darker blue regions indicate stronger absorption, corresponding to higher energy uptake by the NPs under the given conditions.
(D) Temperature profiles under varying HDC (24 mT, black; 125 mT, red; 240 mT, blue) with fixed 5.8 GHz of fAC and 1 s duration.
(E) Temperature responses under repeated 1 s RF pulses at different power (8 W, black; 21 W, blue; 54 W, green; 66 W, red), highlighting the power-dependent heating behavior.
(F) Sequential images of the magnetic composite decomposition under an AC magnetic field at 5.8 GHz, 125 mT, and 60 W for 20 min.
(G) FTIR spectra of the magnetic composite before (black) and after (red) AC field trigger, showing decreased peak intensities of Si−CH3 (786 cm−1) and Si−O−Si (1010 cm−1) in silicone matrix due to thermal decomposition.
(H) 29Si-NMR spectra of the composite before (black) and after (red) AC field trigger, showing decrease in signal intensities at Si−CH3 peak (−22.49 ppm) and Si−O−Si peak (6.68 ppm).
(I) Number-average molecular weight (Mn) changes of the composite over degradation time through GPC analysis.
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© Advanced Functional Materials, originally published in Advanced Functional Materials
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