Document Detail

Surface modification of magnetic nanoparticles capped by oleic acids: characterization and colloidal stability in polar solvents.
MedLine Citation:
PMID:  16054635     Owner:  NLM     Status:  PubMed-not-MEDLINE    
The lyophobic surface of monodisperse magnetic nanoparticles capped by oleic acid was made to be more lyophilic by ozonolysis to increase the stability of the suspension in polar solvents like ethanol. The ozone oxidatively cleaved the double bond of oleic acid to form carbonyl and carboxyl groups on the surface of the nanoparticles. Additionally, interfacial ligand exchange of the capping molecules was applied to make the hydrophobic particle surface more hydrophilic. The magnetic particles showed enhanced miscibility and short-term stability in water after interfacial ligand exchange. The structure changes of the capping molecules on the nanoparticle surfaces were investigated using Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). From these spectroscopy studies, the cleavage of the oleic acid and the formations of the carboxyl and carbonyl groups on the particle surface were confirmed. The shape and the magnetic properties of the nanoparticles were maintained after the surface modification. Ozonolysis is an effective method in modifying the lyophobic surface of the magnetic nanoparticles.
Sang-Yup Lee; Michael T Harris
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Publication Detail:
Type:  Journal Article     Date:  2005-07-28
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  293     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2005-11-21     Completed Date:  2007-05-25     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  401-8     Citation Subset:  -    
School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA.
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