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Liquid crystalline poly(propylene imine) dendrimer-based iron oxide nanoparticles

机译:液晶聚(丙烯亚胺)树枝状氧化铁纳米粒子

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摘要

Poly(propylene imine) dendromesogens (generations from 1 to 4) have been utilized for the synthesis and stabilization of ferrimagnetic Fe2O3 nanoparticles. Reduction of Fe(iii) with further oxidation of Fe(ii) results in the formation of highly soluble nanocomposites of iron oxides in a dendrimer, which are stable under a wide range of temperatures. The magnetic iron oxide nanoparticles were investigated by MALDI-ToF MS spectrometry and elemental analysis. To establish the type of mesophase, X-ray measurements were performed at different temperatures. The calculations of X-ray results demonstrate a hexagonal columnar packing of the molecules in the mesophase. Observation of the samples by TEM gives information about the size of the compounds as well as direct evidence of the implementation of Fe2O3 nanoparticles into dendrimers. Physical parameters of the magnetic nanoparticles (magnetic moment, effective magnetic anisotropy) have been determined from analyses of the EPR data.
机译:聚(丙烯亚胺)树枝状颗粒(几代人从1-4)用于合成和稳定性的铁磁性Fe2O3纳米颗粒。 通过进一步氧化Fe(II)的Fe(III)的减少导致在树枝状聚合物中形成氧化铁的高可溶性纳米复合材料,其在各种温度范围内稳定。 通过MARDI-TOF MS光谱法和元素分析研究了磁性氧化铁纳米颗粒。 为了建立中间相的类型,在不同的温度下进行X射线测量。 X射线结果的计算表明了中间相粒子中分子的六边形柱状填充。 通过TEM观察样品提供有关化合物的大小的信息以及将Fe2O3纳米颗粒的实施方式的直接证据进入树枝状大分子。 已经从EPR数据的分析确定了磁性纳米颗粒(磁矩,有效磁各向异性)的物理参数。

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  • 来源
    《RSC Advances》 |2019年第39期|共14页
  • 作者单位

    Russian Acad Sci GA Krestov Inst Solut Chem Ivanovo 153045 Russia;

    Russian Acad Sci GA Krestov Inst Solut Chem Ivanovo 153045 Russia;

    Russian Acad Sci Zavoisky Phys Tech Inst FRC Kazan Sci Ctr Kazan 420029 Russia;

    Russian Acad Sci GA Krestov Inst Solut Chem Ivanovo 153045 Russia;

    Russian Acad Sci GA Krestov Inst Solut Chem Ivanovo 153045 Russia;

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  • 正文语种 eng
  • 中图分类 化学;
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