Figure 6 Combustion processes of nanothermite samples (a) Al/MnO2 nanothermite (Supplementary movie 1), (b) Al/MnO2/10wt%-terpolymer nanothermite(Supplementary movie 2), (c) Al/MnO2/20wt%-terpolymer nanothermite (Supplementary movie 3), (d) Al/MnO2/30wt%-terpolymer nanothermite (Supplementary movie 4)
To further understand the difference of ignition and combustion phenomenon, the potential reasons are analyzed and discussed combined with above morphology, thermal process and residues analysis, as shown in Figure 7. The red arrow presents the direction of flame growth and spread, and its length and width collectively mean the speed of flame growth and spread. From the above results of TG-DSC test, the thermite reaction occurs before the melting point of Al NPs, implying that thermite reaction belongs to solid-phase reaction.