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.