由聚乙烯吡咯烷酮保护的普鲁士蓝纳米颗粒。

Prussian blue nanoparticles protected by poly(vinylpyrrolidone).

作者信息

Uemura Takashi, Kitagawa Susumu

机构信息

Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.

出版信息

J Am Chem Soc. 2003 Jul 2;125(26):7814-5. doi: 10.1021/ja0356582.

DOI:10.1021/ja0356582

PMID:12822995

Abstract

Prussian blue (PB) nanoparticles protected by poly(vinylpyrrolidone) (PVP) were prepared by mixing aqueous Fe2+, Fe(CN)63-, and PVP solutions together and were characterized by UV-vis, IR, XRPD, and TEM. Averaged dimensions of the nanoparticles were controlled between 12 and 27 nm depending on initial Fe ion concentrations and feed ratios of Fe ion to PVP. Solubility of PB bulk in organic solvents is considerably low; nevertheless, formations of the PB nanoparticles dramatically increase the solubility in a variety of organic solvents. It is noteworthy that the PVP-protected PB nanoparticles stably maintain the cluster formations without further aggregations and dissociation in CHCl3 over 1 month. Measurement of the critical temperature (Tc) where PB nanoparticles exhibit a ferromagnetic property showed a gradual decrease of Tc for the nanoparticles as the particle sizes become smaller. This result could be ascribed to the reduction of the averaged numbers of magnetic interacted neighbors.

摘要

通过将Fe2+水溶液、Fe(CN)63-和聚乙烯吡咯烷酮（PVP）溶液混合制备了由聚乙烯吡咯烷酮（PVP）保护的普鲁士蓝（PB）纳米颗粒，并通过紫外可见光谱、红外光谱、X射线粉末衍射和透射电子显微镜对其进行了表征。根据初始铁离子浓度以及铁离子与PVP的进料比，纳米颗粒的平均尺寸控制在12至27纳米之间。PB块体在有机溶剂中的溶解度相当低；然而，PB纳米颗粒的形成显著提高了其在多种有机溶剂中的溶解度。值得注意的是，PVP保护的PB纳米颗粒在CHCl3中超过1个月能稳定地保持簇状结构，不会进一步聚集和解离。对PB纳米颗粒表现出铁磁性质的临界温度（Tc）的测量表明，随着颗粒尺寸变小，纳米颗粒的Tc逐渐降低。这一结果可归因于磁性相互作用邻居平均数量的减少。