陈伟凡
,
李凤生
,
于吉义
,
李永绣
中国稀土学报
提出了一种新颖的快速制备高比表面氧化铈纳米粉体的方法--盐助溶液燃烧法,通过XRD、TEM和比表面积分析,研究了燃料/氧化剂的比率、不同盐的种类和用量对产物性质的影响.研究发现,在传统的溶液燃烧法中简单的引入KCl导致产物比表面积由14.10 m2·g-1剧增到156.74 m2·g-1,得到了4～6 nm高分散性的纳米氧化铈粒子.通过示意图初步讨论了盐助溶液燃烧合成过程高分散纳米氧化铈粒子形成的可能机制,认为由于自蔓延溶液燃烧反应快速释放出大量的热量,使反应体系产生瞬间高温,盐会迅速在新形成的纳米晶的表面原位析出形成薄盐层,当快速冷却后,氧化铈纳米晶就被镶嵌在凝固的盐基质中,阻止了新生成纳米粒子的重新团聚和烧结,从而得到氧化铈单分散粒子.
关键词:
盐助
,
溶液燃烧法
,
纳米氧化铈
,
乙二醇
,
高比表面积
,
稀土
Runhua Qin
材料科学技术（英文）
A novel salt-assisted low temperature solid state method using CoCl2?6H2O, FeCl3?6H2O and NaOH as pre-
cursor and using NaCl as a dispersant to synthesize high surface area CoFe2O4 nanoparticles, has been
investigated. The effects of the molar ratio of added salt and calcination temperature on the characteristics of
the products were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating
sample magnetometer (VSM) and Brunauer, Emmett and Teller (BET) surface area analysis. Results showed
that the introduction of leachable inert inorganic salt as a hard agglomeration inhibitor in the mixture precursor
led to the formation of high dispersive CoFe2O4 nanoparticles; and the increase in specific surface area from
28.28 to 73.97 m2/g, and the saturation magnetization is 84.6 emu/g.
关键词:
Low temperature solid state reaction
,
盐助
,
钴铁氧体
,
纳米粒子
