Green synthesis of ultrafine super-paramagnetic magnetite nano-fluid: a magnetic and dielectric study

被引：25

作者：

Bahadur, Ali ^{[1
]}

Iqbal, Shahid ^{[2
]}

Saeed, Aamer ^{[1
]}

Bashir, Muhammad Imran ^{[3
]}

Shoaib, Muhammad ^{[1
]}

Waqas, Muhammad ^{[4
]}

Shabir, Ghulam ^{[1
]}

Jabbar, Abdul ^{[5
]}

机构：

[1] Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan

[2] Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China

[3] Quaid I Azam Univ, Dept Phys, Islamabad 45320, Pakistan

[4] Chinese Acad Sci, Inst Proc Engn, Key Lab Multiphase Complex Syst, Beijing 100080, Peoples R China

[5] Allama Iqbal Open Univ Islamabad, Dept Chem, Islamabad, Pakistan

来源：

CHEMICAL PAPERS | 2017年 / 71卷 / 08期

关键词：

Dielectric constant; Co-precipitation; Exchange bias effects; Ultrafine super-paramagnetic; Magnetite; MAGHEMITE GAMMA-FE2O3 NANOPARTICLES; IRON-OXIDE NANOPARTICLES; FE3O4; NANOPARTICLES;

D O I：

10.1007/s11696-017-0138-3

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this communication, environmental friendly and biocompatible ultrafine super-paramagnetic magnetite nanoparticles (USPMNs) ferro-fluid was prepared by modifying co-precipitation green itinerary under optimized conditions. Phase pattern of USPMNs was confirmed by X-ray diffraction (XRD). Particle size of USPMNs was also estimated using the Scherrer's formula which turned out to be almost 12 nm, confirmed by SEM image. The magnetic study of USPMNs confirmed the super-paramagnetic nature with zero coercivity and remanence. The spin glass behavior on the surface of these USPMNs below 40 K was attributed for the exchange bias effects during field cooling process as confirmed by M-T graph. The dielectric constant and dissipation factor followed the same decaying dispersion trend at room temperature. The low temperature effects on dielectric constant and dissipation factor were also studied at frequencies of 10, 20 and 30 kHz.

引用

页码：1445 / 1451

页数：7

共 28 条

[1] Preparation of superparamagnetic maghemite (γ-Fe2O3) nanoparticles by wet chemical route and investigation of their magnetic and dielectric properties [J].