摘要
Nano-Copper and Cu/UDD (ultradispersed diamond) nanocomposites were separately prepared by reduction of CuCl2 aqueous solution and that doped with 0.7%(weight percent) of ultra-dispersed diamond. The as prepared nano-crystals were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR) and electron paramagnetic resonance techniques (EPR). It was found that homogeneous nucleation dominated the aqueous reduction reaction at high concentration and the diameter of nano-copper decreased as the reaction time shortened, yet at lower concentration heterogeneous nucleation predominated and the doped UDD functioned as heterogeneous nucleation. Otherwise large number of free-radicals existed in the nano-composites. Both of nano-copper and Cu/UDD nanocomposites were strong catalysts for AP decomposition, with Cu/UDD being a more effective one. The higher decomposition temperature for AP was 119 ℃ lower than that without catalyst. And the exothermic quantity of decomposition was from 590 J·g-1 to 1 400 J·g-1 by mix 2% of the Cu/UDD nanocomposites.
Nano-Copper and Cu/UDD （ultradispersed diamond） nanocomposites were separately prepared by reduction of CuCl2 aqueous solution and that doped with 0.7%（weight percent） of ultra-dispersed diamond. The as prepared nano-crystals were characterized by X-ray diffraction （XRD）, transmission electron microscope （TEM）, Fourier transform infrared spectroscopy （FTIR） and electron paramagnetic resonance techniques （EPR）. It was found that homogeneous nucleation dominated the aqueous reduction reaction at high concentration and the diameter of nano-copper decreased as the reaction time shortened, yet at lower concentration heterogeneous nucle- ation predominated and the doped UDD functioned as heterogeneous nucleation. Otherwise large number of freeradicals existed in the nano-composites. Both of nano-copper and Cu/UDD nanocomposites were strong catalysts for AP decomposition, with Cu/UDD being a more effective one. The higher decomposition temperature for AP was 119 ℃ lower than that without catalyst. And the exothermic quantity of decomposition was from 590 J·g^-1 to 1 400 J·g^-1 by mix 2% of the Cu/UDD nanocomposites.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2006年第2期316-320,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金资助项目(No.5042047)
江苏省自然科学基金项目(No.BK2003096)
江苏省国际科技合作项目(No.BZ2005009)
国防科工委重点科技基础研究项目(No.K17040610117)
关键词
纳米铜
纳米金刚石
高氯酸铵
催化
nano-copper
Cu/UDD nanocomposites
ammonium perchlorate
catalysis
