2001/01/01 by W. Voit, D. K. Kim, Do Kyung Kim +6 · 1 citation
Chemistry · Energy · Engineering · Physics and Astronomy · #Characterization and Applications of Magnetic Nanoparticles #Chemical engineering #Chemistry #Ferrofluid #Iron oxide #Iron oxide chemistry and applications #Iron oxide nanoparticles #Magnetic field #Magnetic nanoparticles #Magnetite #Magnetization #Materials science #Metallurgy #Nanoparticle #Nanotechnology #Organic chemistry #Particle (ecology) #Particle size #Phase (matter) #Precipitation #Superparamagnetism #Theoretical and Computational Physics
paper · doi:10.1557/proc-676-y7.8
crossref issued 2001/01/01 · crossref published 2001/01/01 · crossref published-print 2001/01/01 · openalex publication_date 2001/01/01 · crossref published-online 2011/03/21 · crossref created 2011/04/05 · crossref deposited 2021/02/24 · openalex created_date 2025/10/10 · crossref indexed 2026/06/17 · openalex updated_date 2026/06/19
ABSTRACT We present a study on the magnetic behavior of nanosized iron oxide particles coated with different surfactants (sodium oleate, PVA and starch) in a ferrofluid. The effect of the coating material, and different particle concentrations in the ferrofluid have been magnetically investigated to determine the effective magnetic particle size and possible interaction. The superparamagnetic iron oxide particles, synthesized by a controlled co-precipitation technique, are found to contain magnetite (Fe 3 O 4 ) as a main phase with a narrow physical particle size distribution between 6 and 8 nm. The mean effective magnetic size of the particles in different ferrofluid systems are estimated to be around 4-5 nm which is smaller than the physical particle size. On a 10% dilution in the starch coated ferrofluid we observe a decrease in the blocking temperature.