Magnetism and Mossbauer study of formation of multi-core γ-Fe2O3 nanoparticles

被引：16

作者：

Kamali, Saeed ^{[1
]}

Bringas, Eugenio ^{[2
]}

Hah, Hien-Yoong ^{[1
]}

Bates, Brian ^{[3
]}

Johnson, Jacqueline A. ^{[1
]}

Johnson, Charles E. ^{[4
]}

Stroeve, Pieter ^{[5
]}

机构：

[1] Univ Tennessee, Inst Space, Dept Mech Aerosp & Biomed Engn, Tullahoma, TN 37388 USA

[2] Univ Cantabria, Dept Chem & Biomol Engn, Av Castros S-N, Santander 39005, Cantabria, Spain

[3] Tennessee Technol Univ, Ctr Mfg Res, Cookeville, TN 38505 USA

[4] Univ Tennessee, Inst Space, Ctr Laser Applicat, Tullahoma, TN 37388 USA

[5] Univ Calif Davis, Dept Chem Engn, Davis, CA 95616 USA

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2018年 / 451卷

关键词：

Multi-core-shell nanoparticles; Maghemite nanoparticles; Mossbauer spectroscopy; High-resolution transmission electron microscopy; Magnetization measurements; Nanomagnetism; MESOPOROUS SILICA NANOPARTICLES; IRON-OXIDE NANOCRYSTALS; CONTROLLED-RELEASE; BIOMEDICAL APPLICATIONS; SPECTROSCOPY; PARTICLES; MOLECULES; SPECTRA;

D O I：

10.1016/j.jmmm.2017.10.102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A systematic investigation of magnetic nanoparticles and the formation of a core-shell structure, consisting of multiple maghemite (gamma-Fe2O3) nanoparticles as the core and silica as the shell, has been performed using various techniques. High-resolution transmission electron microscopy clearly shows isolated maghemite nanoparticles with an average diameter of 13 nm and the formation of a core-shell structure. Low temperature Mossbauer spectroscopy reveals the presence of pure maghemite nanoparticles with all vacancies at the B-sites. Isothermal magnetization and zero-field-cooled and field-cooled measurements are used for investigating the magnetic properties of the nanoparticles. The magnetization results are in good accordance with the contents of the magnetic core and the non-magnetic shell. The multiple-core gamma-Fe2O3 nanoparticles show similar behavior to isolated particles of the same size. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：131 / 136

页数：6

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