Department of Chemistry, Indiana University , 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States.
Langmuir. 2011 Mar 15;27(6):3044-50. doi: 10.1021/la104686d. Epub 2011 Feb 4.
In this paper, we report the influence of reaction conditions and the chain length on the nanoparticle (NP) size and morphology for thermal decomposition of long-chain iron carboxylates such as Fe(III) oleate, palmitate, and myristate. In the majority of cases, spherical NPs are obtained; however, nonspherical morphologies were observed in some "extreme" conditions. For example, iron oxide nanostars are formed in eicosane at the Fe oleate/oleic acid ratio of 0.49 g/mL: the highest oleic acid content when NPs still form. The cubic NPs with flat facets are obtained by decomposition of iron palmitate at the lowest palmitic acid fractions, but the most monodisperse cubes are formed at the Fe palmitate/palmitic acid ratio of 1.19 g/mL. Elliptical NPs are formed from Fe myristate with the most well-defined structure. Easy transformation of these NPs from wüstite to maghemite without aggregation and loss of solubility makes them excellent candidates for biomedical applications after proper functionalization described in our preceding papers.
本文报道了热分解长链铁羧酸盐（如油酸铁、软脂酸铁和肉豆蔻酸铁）时反应条件和链长对纳米颗粒（NP）尺寸和形态的影响。在大多数情况下，得到的是球形 NP；然而，在某些“极端”条件下观察到了非球形形态。例如，在二十烷中，当 Fe 油酸酯/油酸的比例为 0.49 g/mL 时，即 NP 仍在形成时，油酸铁纳米星形成。在最低的棕榈酸分数下，通过分解棕榈酸铁得到具有平坦面的立方 NP，但在 Fe 棕榈酸/棕榈酸的比例为 1.19 g/mL 时，形成最单分散的立方 NP。从肉豆蔻酸铁形成的椭圆形 NP 具有最清晰的结构。这些 NP 很容易从方铁矿转化为磁赤铁矿，而不会发生聚集和溶解度降低，这使得它们在经过我们之前论文中描述的适当功能化后成为生物医学应用的优秀候选者。
