CTAB-Mn3O4 nanocomposites: Synthesis, NMR and low temperature EPR studies

We are reporting on the synthesis of Mn3O4 nanoparticles and CTAB-Mn3O4 nanocomposites via a sonochemical route using MnCl2, ethanol, NaOH and CTAB. The crystalline phase was identified as Mn3O4. The crystallite size of the CTAB-Mn3O4 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 Mn3O4 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.

TEM analysis was performed to investigate the morphology and size of CTAB-Mn3O4 nanocomposites and a micrograph is presented in figure (a). The average particle size DTEM was calculated as 107.5 ± 1.4 nm for the CTAB-Mn3O4 nanocomposites using a log-normal fitting to the histograms obtained from several TEM micrographs.Figure optionsDownload as PowerPoint slide