| 초록 |
We have reported the synthesis and properties of thermite composites composed of Al nanoparticles and three-dimensionally ordered macroporous (3DOM) CuO. The Al particles are evenly distributed throughout the composite structure. Unlike the premise that small CuO pores are mixed with Al nanoparticles at a smaller length scale resulting in higher pressurization rates, 3DOM CuO, which has a pore size of less than 240 nm, has a gradually lower pressure rate. This size dependent trend indicates that the two states of solid state and gas diffusion explain the oxygen transfer from CuO to Al in the thermite composite. If the pore size of CuO is greater than 240 nm, the diffusion of the gas is predominant and the pressurization rate increases as the pore size decreases. On the other hand, on a small length scale, CuO pore size smaller than 240 nm, condensed phase diffusion becomes a more influential factor, reversing the size dependence. |
