|
Özge ACARBAŞ |
Room/Lab: D-311 |
(+90)312 210 5917 |
E-mail: oacarbas@metu.edu.tr |
|
|
Courses/Labs: |
Materials Science and Engineering, Engineering with Polymers, Composite
Materials, Metallography Laboratory, Mechanical Testing
Laboratory |
Interests: |
Sol-Gel Processing, Nanomaterials |
|
Former Degree: B.S.;
Materials Science and Engineering Dept, Anadolu University |
Current Degree: Ph.D.; Metallurgical and Materials Engineering Dept, METU |
|
Production and Characterization of Magnetic Nanoparticles |
Supervisor: Dr. Mürvet VOLKAN & Dr. Macit ÖZENBAŞ |
|
In this study, Fe2O3-SiO2
nanocomposites are prepared through a sol-gel method. A multitechnique approach,
by XRD and VSM (Vibrating Sample Magnetometer), is used to
characterize the structure and the magnetic properties of the
nanoparticles. VSM measurements are conducted at different
temperatures. XRD spectra showed that the Surface Area/Volume ratio
adopted in the process of gelation influences the characteristics of
the material obtained. The average size of resulting maghemite (γ -Fe2O3) nanoparticles was in the range of 12-20 nm. |
|
Schematic diagram of the mechanism of formation of
γ -Fe2O3 nanoparticles in the silica matrix. TEOS is hydrolyzed by the hydration water of the iron salt and condenses at temperatures lower than 80ºC, giving rise to the initial gel. The pore of the gel constitutes the ideal environment for the nucleation of some iron oxide-hydroxide polymers which show magnetic behavior. Later heat treatment up to 400ºC promotes the formation and growth of γ -Fe2O3 nanoparticles on the preformed nuclei. |
|
mp |
|
