2 research outputs found
Stabilization in Water of Large Hydrophobic Uniform Magnetite Cubes by Silica Coating
Novel water dispersible large cubic nanocapsules consisting of uniform
hydrophobic magnetite core (79 and 126 nm) and amorphous silica shell were
prepared. Silica modification of magnetite particles and functionalization of silica
surface by introducing methylphosphonate groups were performed at the same time.
These nanoparticles were characterized by both transmission and scanning electron
microscopy, dynamic light scattering, ζ potential determinations, X-ray techniques,
Fourier-transform infrared spectroscopy, and magnetization measurements. The
results show that the methodology employed to coat the hydrophobic magnetite
with a silica shell provides uniform core shell magnetite silica nanoparticles with a
good colloidal stability in water and control of the morphology and of the silica
thickness. Thus, the high hydrophobicity and strong magnetic dipole interaction of
these magnetite nanoparticles are tailored by silica modification, therefore opening a
new range of applications in water for these magnetic nanoparticlesWe thank the MICINN (Spain) for financial support (Projects
MAT2009-09671 and MAT2010-19883) and Dr. Puerto Morales
for her advice in magnetization theoryPeer reviewe