Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India.
Carbohydr Polym. 2013 Oct 15;98(1):80-8. doi: 10.1016/j.carbpol.2013.05.020. Epub 2013 May 31.
Nickel nanoparticles synthesized from NiCl2·6H2O by hydrazine hydrate in mixed solvent of ethanol and water in the presence of hydroxypropylmethylcellulose (HPMC) as protective and stabilizing agents. The morphology and sizes of synthesized Ni nanoparticles were studied by field-emission-scanning-electron microscopy (FESEM). Structural properties of nanoparticles were examined by X-ray diffraction (XRD). The polymer stabilized Ni nanoparticles were characterized by Fourier-transform infrared (FTIR) spectroscopy. The magnetic measurement showed that the resultant Ni nanoparticles were ferromagnetic. Also, the saturation magnetization (MS), remanent magnetization (MR) and coercivity (MR) were observed to increase with decreasing temperature. The results of magnetic characterization showed that the magnetic properties of the HPMC stabilized Ni nanoparticles are quite different from those of the bared Ni nanoparticles. All the observed magnetic properties essentially reflected the very typical nanoparticle type nature. Consequently, the resulting Ni nanoparticles were found to be highly active and recyclable catalyst for Suzuki coupling reactions.
由 NiCl2·6H2O 在乙醇和水的混合溶剂中通过水合肼合成的纳米镍颗粒，其中羟丙基甲基纤维素（HPMC）作为保护和稳定剂。通过场发射扫描电子显微镜（FESEM）研究了合成的 Ni 纳米颗粒的形态和尺寸。通过 X 射线衍射（XRD）研究了纳米颗粒的结构特性。通过傅里叶变换红外（FTIR）光谱对聚合物稳定的 Ni 纳米颗粒进行了表征。磁测量表明，所得 Ni 纳米颗粒为铁磁性。此外，随着温度的降低，观察到饱和磁化强度（MS）、剩余磁化强度（MR）和矫顽力（MR）增加。磁特性研究结果表明，HPMC 稳定的 Ni 纳米颗粒的磁性能与裸露的 Ni 纳米颗粒有很大的不同。所有观察到的磁性能本质上反映了非常典型的纳米颗粒类型的性质。因此，所得的 Ni 纳米颗粒被发现是Suzuki 偶联反应的高活性和可回收催化剂。
