Abstract
TEM analysis was performed to investigate the morphology and size of CTAB-Mn
3O
4 nanocomposites and a micrograph is presented in figure (a). The average particle size
D
TEM was calculated as 107.5
±
1.4
nm for the CTAB-Mn
3O
4 nanocomposites using a log-normal fitting to the histograms obtained from several TEM micrographs.
We are reporting on the synthesis of Mn
3O
4 nanoparticles and CTAB-Mn
3O
4 nanocomposites via a sonochemical route using MnCl
2, ethanol, NaOH and CTAB. The crystalline phase was identified as Mn
3O
4. The crystallite size of the CTAB-Mn
3O
4 nanocomposite was identified as 13
±
5
nm from X-ray line profile fitting and the particle size from TEM was 107.5
±
1.4
nm. The interaction between CTAB and the Mn
3O
4 nanoparticles was investigated by FTIR and
1H NMR spectroscopies. Two different magnetic phase transitions were observed for both samples below the Curie temperature (43
°C) by using a low temperature Electron Paramagnetic Resonance (EPR) technique. Also we determined the effect of the capping with CTAB on the reduction in absorbed power.