RT Journal Article ID 3e28449b703df339 A1 Jiang, Wei A1 Li, Fengsheng A1 Wang, Yi A1 Guo, Xiaode A1 Cheng, Zhipeng A1 Zhang, Xiaojuan A1 Wu, Shixi T1 THERMAL REACTIVITY OF AL/FE CORE−SHELL NANOCOMPOSITES JF International Journal of Energetic Materials and Chemical Propulsion JO IJEMCP YR 2011 FD 2012-06-29 VO 10 IS 2 SP 123 OP 134 K1 thermal reactivity; nanocomposite; micro-Al; nano-Fe K1 displacement method; oxidation AB To improve the thermal reactivity of aluminum micro-particles, Al/Fe nanocomposites with core-shell structure were prepared by a displacement method, in which Al micro-particles were coated by Fe nanoparticles. The reactivity of Al before and after coating was examined via thermal analysis. Moreover, to demonstrate the significant role of surface coating a mixture consisting of micro-Al and nano-Fe was also tested. Two oxidizers (O2 and CuO) were employed to react with the fuels. The parameters derived from thermogravimetric (TG), differential scanning calorimetric (DSC), and differential thermogravimetric (DTG) curves of each sample were compared. It was obvious that the reaction involving Al/Fe exhibited the highest integrated heat (in DSC), the highest weight increase (in TG), and the largest reaction rate (in DTG). Only Al/Fe-O2 and Al/Fe-CuO exhibited a distinct low-temperature reaction adjacent to the Al melting point, which may be significant in their ignition at high heating rates. Moreover, Al/Fe fueled systems manifested the lowest apparent activation energy comparing with systems using [Al+Fe] and raw Al as the fuels. All these results affirmed augmentation in thermal reactivity arising from surface coating with nano-Fe. PB Begell House LK https://www.dl.begellhouse.com/journals/17bbb47e377ce023,57e9500f714490c3,3e28449b703df339.html