Synthesis of variable-sized nanocrystals of Fe3O4 with high surface reactivity
Synthesis of variable-sized nanocrystals of Fe3O4 with high surface reactivity
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DOI：
10.1021/cm0487977
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发表时间：
2004-12-14
影响因子：
8.6
通讯作者：
Kolesnichenko, VL
中科院分区：
文献类型：
--
作者：
Caruntu, D;Caruntu, G;Kolesnichenko, VL
一种新的合理的方法合成纳米氧化铁（II，III）是基于在相应的醇，二甘醇，和N-甲基二乙醇胺的溶液中的螯合铁醇盐络合物的高温水解。通过改变反应物的浓度和改变温度，可以容易地调节反应和结晶的速率。通过改变反应介质的络合强度来控制纳米晶体的尺寸：在二甘醇中为5.7 nm，在N-甲基二乙醇胺中为16.8 nm，在两种溶剂的1：1混合物中为12.7 nm。以高收率分离出纳米晶粉末状Fe 3 O 4产物。所获得的纳米晶体的表面被吸附的供体溶剂的分子钝化，所述供体溶剂的分子提供抗团聚的稳定性，提供在极性质子溶剂（水和甲醇）中的溶解度，并允许在非晶表面处的反应。
A new rational method of synthesis of nanocrystalline iron (II, III) oxide is based on the elevated-temperature hydrolysis of chelate iron alkoxide complexes in solutions of corresponding alcohol, diethylene glycol, and N-methyl diethanolamine. The rates of reaction and crystallization are easily tuned by varying the concentration of reactants and changing the temperature. The size of the nanocrystals is controlled by changing the complexing strength of the reaction medium: 5.7 nm in diethylene glycol, 16.8 nm in N-methyl diethanolamine, and 12.7 nm in a 1: 1 mixture of both solvents. The nanocrystalline powdered Fe3O4 products were isolated with a high yield. The surface of the obtained nanocrystals is passivated by molecules of adsorbed donating solvent that provide stability against agglomeration, provide solubility in polar protic solvents (water and methanol), and allow reactions at the nanocrystal surface.