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Chain length dependence of polyol synthesis of zinc ferrite nanoparticles: why is diethylene glycol so different?

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Title Chain length dependence of polyol synthesis of zinc ferrite nanoparticles: why is diethylene glycol so different?
 
Creator RISHIKESHI, SN
JOSHI, SS
TEMGIRE, MK
BELLARE, JR
 
Subject POLYNUCLEAR COORDINATION-COMPOUNDS
MAGNETIC-PROPERTIES
DINUCLEAR COMPLEXES
FTIR SPECTROSCOPY
AQUEOUS-SOLUTIONS
EXCHANGE
OXALATE
OXIDE
NANOCRYSTALS
GLYCOLALDEHYDE
 
Description Superparamagnetic ZnFe2O4 nanoparticles with size range of 28-38 nm were synthesized by polyol process based on use of varying chain length glycols as solvent. We have offered, for the first time, the plausible mechanism behind in situ formation of zinc ferric oxalate hydroxide hydrate [Fe2Zn(C2O4)(2)(OH)(3)](+)center dot 4H(2)O complex from diethylene and polyethylene glycol. We are also reporting, the magnetic properties of above complexes. We have found a ferromagnetic ordering in precursor complex compounds. The intermediate hydrocarbon chain between the oxalato bridged metal cations plays a crucial role in obtaining anomalous magnetic behavior. ZnFe2O4 nanoparticles obtained after annealing the DEGylated precursor complex (precursor complex formed in diethylene glycol) showed the highest superparamagnetic (SPM) behavior (22.4 emu g(-1)) among others. The reasons for anomalous SPM behavior of ZnFe2O4 nanoparticles are explained on the basis of the degree of inversion of the spinel structure, high surface-to-volume ratio, which causes non-collinear spin arrangement in a surface layer and higher oxygen concentration on the surface of dead organic layer, which increases the unpaired valence electrons leading to uncompensated surface spins.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-10-15T10:56:36Z
2014-10-15T10:56:36Z
2013
 
Type Article
 
Identifier DALTON TRANSACTIONS, 42(15)5430-5438
http://dx.doi.org/10.1039/c2dt32026f
http://dspace.library.iitb.ac.in/jspui/handle/100/14801
 
Language en