摘要
采用置换法，通过在溶液中引入F^-离子，实现了弱酸性条件下Fe纳米粒子在微米Al粉表面定量、快速地化学沉积，制备出具有核壳结构的Fe／Al微纳米复合粒子。将该复合粒子中的Al核用盐酸溶蚀后得到由纳米Fe粒子组成的空心球壳。利用SEM、EDS、XRD、BET和TG／DSC对产物进行了相应地表征，结果表明，微米Al核表面被一层粒径约为30～60nm的Fe纳米粒子致密包覆，Fe／Al复合粉体的比表面积达到11．993m^2／g较包覆前的1．082m^2／g增加了11倍，且Fe／Al微纳米复合粉体与O2反应的活性明显高于原料Al粉。
Via introducing of F- ions, a kind of core-shell Fe/Al nanocomposite had been prepared by displacement method, in which the micron Al grain were coated in a lay of nanometer Fe particles. When as-prepared Fe/Al nanocomposites were immersed into hydrochloric acid until there was no effervescence, the porous shellshaped products composing of nanometer Fe particles can be obtained. SEM, EDS, XRD, BET and TG/DSC analysis were employed to characterize the samples. Results indicated that Al core were covered by the tightly agglomerated Fe nanoparticles of 30-60nm in size, showing honeycomb-like coarse surface. After coating, the specific surface area has an 11-fold increase from 1. 082 to 11. 993m^2/g. Moreover, the thermal reactivity of Fe/ Al nanocomposites with O2 is obviously higher than that of raw Al powders.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第11期1900-1902,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50602024)
关键词
复合材料
表面包覆
置换法
Al粉
纳米Fe粒子
composites
surface coating
displacement method
aluminum powders
nanometer Fe particles
