CS-Fe(II,III) complex as precursor for magnetite nanocrystal

Yongliang Wang; Baoqiang Li; Yu Zhou; Dechang Jia; Yang Song

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CS-Fe(II,III) complex as precursor for magnetite nanocrystal

机译：CS-Fe（II，III）络合物作为磁铁矿纳米晶体的前体

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Chitosan-iron ions complex (CS-Fe(II,III) complex) was used as precursor to synthesize magnetite nanocrystals and the mechanism was discussed. The magnetite nanocrystals have diameters of about 10 nm and clusters were formed due to slight aggregation of several magnetite nanocrystals. FT-IR and X-ray photoelectron spectrometer (XPS) investigations indicated that the Fe(II) and Fe(III) were chelated by -NH_2 and -OH groups of chitosan in CS-Fe(II,III) complex, and the molar ratio of -NH_2/Fe(II,III) was approximately 2. This chelation effect destroyed the hydrogen bonds of chitosan. In the following alkali treatment process, the chelated Fe(II) and Fe(III) provided nucleation site and formed the magnetite nanocrystals. After alkali treatment, the chelation effect between iron ions and -NH_2 groups disappeared and some kind of weak interaction formed between magnetite and -NH_2 groups. Moreover, the -OH groups of chitosan have an interaction with the synthesized magnetite nanocrystals.

机译：以壳聚糖-铁离子配合物（CS-Fe（II，III）配合物）为前驱体，合成磁铁矿纳米晶，并对其机理进行了探讨。磁铁矿纳米晶体具有约10nm的直径，并且由于几个磁铁矿纳米晶体的轻微聚集而形成簇。 FT-IR和X射线光电子能谱仪（XPS）研究表明，Fe（II）和Fe（III）被CS-Fe（II，III）配合物中壳聚糖的-NH_2和-OH基团螯合-NH 2 / Fe（II，III）的比率约为2。这种螯合作用破坏了壳聚糖的氢键。在随后的碱处理过程中，螯合的Fe（II）和Fe（III）提供了成核点并形成了磁铁矿纳米晶体。碱处理后，铁离子与-NH_2基团之间的螯合作用消失，磁铁矿与-NH_2基团之间形成弱相互作用。此外，壳聚糖的-OH基团与合成的磁铁矿纳米晶体具有相互作用。

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《Polymers for advanced technologies》 |2011年第12期|共4页
作者
Yongliang Wang; Baoqiang Li; Yu Zhou; Dechang Jia; Yang Song;
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正文语种 eng
中图分类高分子化学（高聚物）;
关键词
CS-Fe complex; Chelation; Chitosan; Magnetite nanocrystal;

机译：CS-Fe络合物;螯合;壳聚糖;磁铁矿纳米晶;

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CS-Fe(II,III) complex as precursor for magnetite nanocrystal

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