Structure and superparamagnetic behaviour of magnetite nanoparticles in cellulose beads

Structure and superparamagnetic behaviour of magnetite nanoparticles in cellulose beads

Superparamagnetic magnetite nanoparticles were obtained starting from a mixture of iron(II) and iron(III) solutions in a preset total iron concentration from 0.04 to 0.8 mol l −1 with ammonia at 25 and 70 °C. The regeneration of cellulose from viscose produces micrometrical spherical cellulose beads...

Full description

Saved in:
Bibliographic Details
Published in:Materials research bulletin Vol. 45; no. 8; pp. 946 - 953
Main Authors: Correa, José R., Bordallo, Eduardo, Canetti, Dora, León, Vivian, Otero-Díaz, Luis C., Negro, Carlos, Gómez, Adrián, Sáez-Puche, Regino
Format: Journal Article
Language:English
Published: United States Elsevier Ltd 01-08-2010
Subjects:
A. Composites
A. Magnetic materials
B. Chemical synthesis
C. Electron microscopy
CELLULOSE
CRYSTALS
D. Magnetic properties
IRON
MAGNETIC MATERIALS
MAGNETIC SUSCEPTIBILITY
MAGNETITE
MATERIALS SCIENCE
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
SUPERPARAMAGNETISM
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
B. Chemical synthesis
C. Electron microscopy
A. Magnetic materials
A. Composites
D. Magnetic properties
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Superparamagnetic magnetite nanoparticles were obtained starting from a mixture of iron(II) and iron(III) solutions in a preset total iron concentration from 0.04 to 0.8 mol l −1 with ammonia at 25 and 70 °C. The regeneration of cellulose from viscose produces micrometrical spherical cellulose beads in which synthetic magnetite were embedded. The characterization of cellulose–magnetite beads by X-ray diffraction, Scanning and Transmission Electron Microscopy and magnetic measurement is reported. X-ray diffraction patterns indicate that the higher is the total iron concentration and temperature the higher is the crystal size of the magnetite obtained. Transmission Electron Microscopy studies of cellulose–magnetite beads revealed the distribution of magnetite nanoparticles inside pores of hundred nanometers. Magnetite as well as the cellulose–magnetite composites exhibit superparamagnetic characteristics. Field cooling and zero field cooling magnetic susceptibility measurements confirm the superparamagnetic behaviour and the blocking temperature for the magnetite with a mean size of 12.5 nm, which is 200 K.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2010.04.012