Synthesis and Determination of Iron-iron oxide Core-shell Nanoparticles

• Main Author: 李世莉
• Other Authors: Kung-Hwa Wei
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/19686099304309492946

碩士 === 國立交通大學 === 材料科學與工程系所 === 94 === In this thesis, iron/iron oxide core-shell nanoparticles have been prepared successfully by a reversed-micelle method. After purification by magnet and centrifuge, the core-shell structure of iron/iron oxide nanoparticles was characterized by transmission electron microscopy (TEM). The oxidation state and the composition of the nanoparticles were determined by energy dispersion spectrum (EDS), electron energy loss spectrum (EELS), energy-filtered TEM image (EFTEM), and X-ray photoelectron spectrum (XPS). Magnetization measurements were performed with M-T and M-H curves on a Superconducting Quantum Interference Device (SQUID) magnetometer. The iron-iron oxide nanoparticles can be dispersed in pyridine by the dipole-dipole interactions between the hydroxyl groups and the pyridine molecules. Moreover, a hydrophilic surface of the particles can be obtained by the surface modification with olic acid as the surfactant. The self-assembled iron-iron oxide/PS-P4VP block copolymer nanocomposites have be prepared in pyridine. The iron-iron oxide nanoparticles can be sequestrated selectively in the P4VP domains of PS-P4VP bulk samples and thin films. The structural long-rang orientation of the nanocomposites could be obtained by the application of a magnetic field.