Frontiers of Chemical Science and Engineering
>> 2014,
Volume 8,
Issue 3
doi:
10.1007/s11705-014-1441-y
RESEARCH ARTICLE
Influences of spinel type and polymeric surfactants on the size evolution of colloidal magnetic nanocrystals (MFe
1. Department of Chemical Engineering, Quchan University of Advanced Technology, Quchan 94771, Iran.2. Department of Chemistry, Ferdowsi University of Mashhad, Mashhad 91775, Iran.3. School of Chemical Engineering, The University of Adelaide, SA 5005, Australia
Accepted: 2014-09-22
Available online: 2014-10-11
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Abstract
Two types of polymeric surfactants, PEG and PVP , were used for the preparation of magnetic ferrite MFe O (M= Mn, Fe) colloidal nanocrystals using a solvothermal reaction method. The effect of spinel type effect on the size evolution of various nanoparticles was investigated. It was found that Fe O nanoparticles exhibited higher crystalinity and size evolution than MnFe O nanoparticles with use of the two surfactants. It is proposed that this observation is due to fewer tendencies of surfactants on the surface of Fe O building blocks nanoparticles than MnFe O . Less amounts of surfactant or capping agent on the surface of nanoparticles lead to the higher crystalibity and larger size. It is also suggested that the type of spinel (normal or inverted spinel) plays a key role on the affinity of the polymeric surfactant on the surface of building blocks.
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