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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Composition and hydrophilicity control of Mn-doped ferrite (MnxFe3-xO4) nanoparticles induced by polyol differentiation
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Composition and hydrophilicity control of Mn-doped ferrite (MnxFe3-xO4) nanoparticles induced by polyol differentiation

机译:多元醇分化诱导Mn掺杂铁氧体(MnxFe3-xO4)纳米粒子的组成和亲水性控制

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Manganese doped ferrite (MnxFe3-xO4) nanoparticles with x = 0.29-0.77 were prepared under solvothermal conditions in the presence solely of a polyol using the trivalent manganese and iron acetylacetonates as precursors. In this facile approach, a variety of polyols such as polyethylene glycol (PEG 8000), tetraethylene glycol (TEG), propylene glycol (PG) and a mixture of TEG and PG (1 : 1) were utilized in a triple role as a solvent, a reducing agent and a surface-functionalizing agent. The composition of the fine cubic-spinel structures was found to be related to the reductive ability of each polyol, while determination of structural characteristics plus the inversion parameter (i = 0.18-0.38) were provided by X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy at both the Fe and Mn K-edges. The saturation magnetization increased up to 80 emu g(-1) when x = 0.35 and i = 0.22. In addition, the as-prepared nanocrystals coated with PEG, PG and PG&TEG showed excellent colloidal stability in water, while the TEG-coated particles were not water dispersible and converted to hydrophilic when were extra PEGylated. Measurements of the H-1 NMR relaxation in water were carried out and the nanoprobes were evaluated as potential contrast agents.
机译:在溶剂热条件下,仅在多元醇的存在下,以三价锰和乙酰丙酮铁为前驱体,制备了x = 0.29-0.77的锰掺杂铁氧体(MnxFe3-xO4)纳米粒子。在这种简便的方法中,多种多元醇(例如聚乙二醇(PEG 8000),四甘醇(TEG),丙二醇(PG)以及TEG和PG的混合物(1:1))以三重作用用作溶剂,还原剂和表面官能化剂。精细的立方-尖晶石结构的组成被发现与每种多元醇的还原能力有关,同时通过边缘结构的X射线吸收(XANES)来确定结构特征和反演参数(i = 0.18-0.38)。 )以及在Fe和Mn K边缘的扩展X射线吸收精细结构(EXAFS)光谱。当x = 0.35和i = 0.22时,饱和磁化强度增加到80 emu g(-1)。另外,用PEG,PG和PG&TEG包被的制备的纳米晶体在水中显示出优异的胶体稳定性,而当TEG包被的颗粒被额外的PEG化时,其不溶于水并且转化为亲水性。进行了H-1 NMR在水中的弛豫测量,并评估了纳米探针作为潜在的造影剂。

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