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

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Joshi, Satyawati S. Rishikeshi, Supriya N. Bellare, Jayesh R. Temgire, Mayur K.
Description	Author Affiliation: Rishikeshi SN ( Department of Chemistry, Center for Advanced Studies in Chemistry, University of Pune, Pune 411007, India. supriya.rishikeshi@gmail.com)
Abstract	Superparamagnetic $ZnFe_{2}O_{4}$ 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 $[Fe_{2}Zn(C_{2}O_{4})_{2}(OH)_{3}]^{+}·4H_{2}O$ 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. $ZnFe_{2}O_{4}$ 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 $ZnFe_{2}O_{4}$ 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.
ISSN	14779226
Issue Number	15
Volume Number	42
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-04-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Ethylene Glycols Chemistry Ferric Compounds Metal Nanoparticles Polymers Zinc Magnetics Ultrastructure Particle Size Polyethylene Glycols Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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