Controllable Synthesis of Manganese Oxide Nanostructures from 0-D to 3-D and Mechanistic Investigation of Internal Relation between Structure and T1 Relaxivity,Chemistry of Materials

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Controllable Synthesis of Manganese Oxide Nanostructures from 0-D to 3-D and Mechanistic Investigation of Internal Relation between Structure and T1 Relaxivity
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-12-13 00:00:00 , DOI: 10.1021/acs.chemmater.7b04100
Zhenghuan Zhao ₁ , Jianfeng Bao ₂ , Chen Fu ₁ , Ming Lei ₁ , Jingliang Cheng ₃

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Since manganese oxide nanomaterials attract wide attention in the biomedical and energy fields, understanding the inner relationship between their properties and structures is fundamental and urgently needed. However, controllable synthesis of metal oxide nanomaterials with diverse morphologies is still a persistent challenge. Herein, various anisotropic manganese oxide nanostructures from zero-dimensional (0-D) to three-dimensional (3-D) were successfully fabricated through thermal decomposition. We observed that chloride ions can assist the formation of 0-D nanooctaherals, nanocubes, and nanooctapods due to its binding capacity to the manganese ions on the nanocrystal surface. Interestingly, the procedural heating process can affect the decomposition rate of the manganese–oleate, which drives a substantial reduction in the surface free energy by sharing a common crystallographic orientation and leads to the formation of 1-D and 3-D nanostructures by oriented attachment growth. On the basis of systematic analyses, surface-to-volume ratio, surface manganese ion density, and geometrical confinement determined by specific morphology are found to be the key parameters to achieve high-performance T₁ relaxivity. Moreover, the screened out manganese oxide nanocubes with high r₁ value exhibit good contrast ability in T₁-weighted MRI imaging in vitro and in vivo, showing a great potential for lesion detection in T₁ contrast imaging. This study builds a link between controllable synthesis of manganese oxide nanomaterials and its property and, thus, provides a rational design clue to develop high-performance magnetic oxide nanomaterials, especially in the biomedical and energy fields.

中文翻译：

从0-D到3-D的锰氧化物纳米结构的可控合成及结构与T ₁弛豫性之间内部关系的机理研究

由于氧化锰纳米材料在生物医学和能源领域引起了广泛的关注，因此迫切需要了解其性质与结构之间的内在联系。然而，具有多种形态的金属氧化物纳米材料的可控合成仍然是一项持续的挑战。在此，通过热分解成功地制造了从零维（0-D）到三维（3-D）的各种各向异性氧化锰纳米结构。我们观察到，由于氯离子与纳米晶体表面上的锰离子的结合能力，它们可以协助0-D纳米八面体，纳米立方和纳米八足体的形成。有趣的是，程序加热过程会影响油酸锰的分解速率，它通过共享共同的晶体学取向来驱动表面自由能的大幅降低，并通过取向附着生长而导致形成1-D和3-D纳米结构。在系统分析的基础上，发现表面体积比，表面锰离子密度和通过特定形态确定的几何限制是实现高性能的关键参数。T ₁松弛度。此外，具有高的筛选出氧化锰纳米立方体- [R _1点中的值显示出良好的对比度能力Ť ₁加权MRI成像在体外和体内，示出了用于在病变检测的巨大潜力Ť ₁对比成像。这项研究建立了可控制的氧化锰纳米材料的合成与其性能之间的联系，从而为开发高性能的磁性氧化物纳米材料提供了合理的设计线索，尤其是在生物医学和能源领域。

更新日期：2017-12-13

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