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Author Anantharaman, M. R. ♦ Reena Mary, A. P. ♦ Shaijumon, M. M. ♦ Lijie Ci ♦ Ajayan, P. M. ♦ Narayanan, T. N.
Source CUSAT-Thesis
Content type Text
Publisher IOP Publishing LTD
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Technology
Abstract Multiwall carbon nanotubes (MWCNTs) possessing an average inner diameter of 150 nm weresynthesized by template assisted chemical vapor deposition over an alumina template. Aqueousferrofluid based on superparamagnetic iron oxide nanoparticles (SPIONs) was prepared by acontrolled co-precipitation technique, and this ferrofluid was used to fill the MWCNTs bynanocapillarity. The filling of nanotubes with iron oxide nanoparticles was confirmed byelectron microscopy. Selected area electron diffraction indicated the presence of iron oxide andgraphitic carbon from MWCNTs. The magnetic phase transition during cooling of theMWCNT–SPION composite was investigated by low temperature magnetization studies andzero field cooled (ZFC) and field cooled experiments. The ZFC curve exhibited a blocking at∼110 K. A peculiar ferromagnetic ordering exhibited by the MWCNT–SPION composite aboveroom temperature is because of the ferromagnetic interaction emanating from the clustering ofsuperparamagnetic particles in the constrained volume of an MWCNT. This kind ofMWCNT–SPION composite can be envisaged as a good agent for various biomedicalapplications
Education Level UG and PG
Learning Resource Type Article