| 초록 |
We report the synthesis and characterization of thermite composites consisting of Al nanoparticles and three dimensionally-ordered macroporous (3DOM) CuO. Using three dimensionally ordered macroporous (3DOM) CuO and Al nanoparticles (NPs) we established the uniform dispersion thermite system. After combustion, the size dependence indicates that two different pathways, solid-state and gaseous diffusion, account for oxygen transfer from CuO to Al in the thermite composites. With the pore size of CuO larger than 240 nm, gas-phase diffusion predominates and pressurization rate increases as the size of the pores decreases. On the other hand, at small length scale, i.e., with CuO pore size smaller than 240 nm, condensed-phase diffusion is becoming a visibly more influential factor, reversing the size dependence. |
