Hydrothermal Growth of Fatty Acid Stabilized Iron Oxide Nanocrystals
Hydrothermal Growth of Fatty Acid Stabilized Iron Oxide Nanocrystals
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DOI：
10.1021/jp8062433
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发表时间：
2009-01
影响因子：
3.7
通讯作者：
T. Taniguchi;Kazunori Nakagawa;Tomoaki Watanabe;N. Matsushita;M. Yoshimura
中科院分区：
文献类型：
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作者：
T. Taniguchi;Kazunori Nakagawa;Tomoaki Watanabe;N. Matsushita;M. Yoshimura
通过油酸改性的铁离子和亚铁离子的共沉淀形成的种子纳米晶体，在油酸钠和Fe离子[SO]/[Fe]的摩尔比为0.05至0.5的情况下，在100 - 230 °C下进行水热处理以引发晶体生长。傅里叶变换红外光谱显示，这些纳米晶体的稳定表面油酸酯，形成一个稳定的胶体溶液中的各种非极性溶剂，如环己烷和苯。X射线衍射分析表明，较高的水热温度和较低的油酸盐浓度促进奥斯特瓦尔德熟化过程，以产生基于阳离子缺乏的磁铁矿多晶型物的高度结晶的氧化铁纳米晶体。透射电子显微镜显示，油酸浓度在控制成核和生长过程中起着重要的作用，发现较低的油酸浓度是较好的生长条件，以产生均匀的大小和形状的纳米粒子与h.2O3。
Seed nanocrystals formed by the coprecipitation of ferric and ferrous ions with oleate modification, at the molar ratios of sodium oleate and Fe ion [SO]/[Fe] from 0.05 to 0.5, were subjected to a hydrothermal treatment at 100−230 °C to initiate the crystal growth. Fourier transform infrared spectroscopy revealed that these nanocrystals were stabilized by a surface oleate that formed a stable colloidal solution in various nonpolar solvents such as cyclohexane and benzene. An X-ray diffraction analysis showed that the higher hydrothermal temperatures and lower oleate concentration promoted the Ostwald ripening process to produce highly crystallized iron oxide nanocrystals based on a cation deficient magnetite polymorph. Transmission electron microscopy revealed that the oleate concentrations played an important role in controlling the nucleation and growth process; it was found that the lower oleate concentration was the preferable growth condition to produce uniformly sized and shaped nanoparticles with h...