期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 10, 页码 1341-1346出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201202100
关键词
spray pyrolysis; metal oxides; hollow materials; metastable intermolecular composites; nanothermites
类别
资金
- Defense Threat Reduction Agency
- Army Research Office
- Maryland NanoCenter
- NispLab
- NSF as a MRSEC Shared Experimental Facility
Thermochemical metal/metal oxide redox reactions have twice the energy density of 2,4,6-trinitrotoluene (TNT). They suffer, however, from low pressure-volume work due to low gas expansion from the reaction. This study focuses on the development of a nanocomposite that delivers a high energy density and the potential of rapid gas release. Hollow CuO spheres with nanosized building blocks are fabricated using a droplet-to-particle aerosol spray pyrolysis method with the introduction of gas-blowing agents in the synthesis procedure. Nanoaluminum with hollow CuO as an oxidizer ignites in a very violent manner and exhibits excellent gas-generation behavior, demonstrating a high pressurization rate of 0.745 MPa s1 and a transient peak pressure of 0.896 MPa with a charge density of 1 mg cm3, as well as a rapid oxygen release. Compared with wet-chemistry methods, gas-phase processes are relatively low cost, nominally offer a higher purity product, and are usually configured as continuous production processes, with a limited number of steps. The synthesis strategy demonstrated is simple and should be extendable to the preparation of other hollow metal oxide structures.
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