Results 171 to 180 of about 35,935 (220)

Silica Coating on Colloidal Maghemite Particles

Journal of Colloid and Interface Science, 1999
Maghemite colloidal particles are coated with a silica layer using a silicon alkoxide as silica precursor. The coating process is studied by electrophoresis, quasi-elastic light scattering, nitrogen adsorption, and infrared spectrometry analyses. The conditions of complete coverage of the iron oxide particles by silica and the nature of the maghemite ...
Michaela Klotz, André M Ayral, Christine Ménager   +2 more
exaly   +4 more sources

Analysis on variety and characteristics of maghemite

Science China Earth Sciences, 2010
Maghemite (γ-Fe2O3) is a very common mineral at the earth’s surface and also an important material for making music and video tapes. Maghemite is usually synthesized from magnetite under oxidizing conditions after a few hours or a few days below a temperature of 300°C.
Jian-Zhong Jiang, Jan Bloemendal, Paul P Hesse   +2 more
exaly   +2 more sources

Interfacial and Rheological Characteristics of Maghemite Aqueous Suspensions

Journal of Colloid and Interface Science, 1998
The interfacial properties and rheological behavior of the maghemite/water system have been investigated in this work. It has been determined that the real pzc and iep values of maghemite immersed in aqueous solution, containing KNO3 as electrolyte, are very close to 6.6.
M Puerto Morales, Pedro Tartaj
exaly   +3 more sources

Silica-Maghemite Nanocomposites

Advanced Materials, 2001
A. Bourlinos, A. Simopoulos, D. Petridis, H. Okumura, G. Hadjipanayis   +4 more
exaly   +2 more sources

The Center Shift in Mössbauer Spectra of Maghemite and Aluminum Maghemites

Clays and Clay Minerals, 1994
AbstractSynthetic, relatively well-crystallized aluminum-substituted maghemite samples, γ-(Aly·Fe1−y)2O3, with y = 0, 0.032, 0.058, 0.084, 0.106 and 0.151 have been studied by X-ray diffraction and zero-field Mössbauer spectroscopy in the range 8 K to 475 K, and also with an external field of 60 kOe at 4.2 K and 275 K.
G. M. Da Costa, E. De Grave, L. H. Bowen, R. E. Vandenberghe, P. M. A. De Bakker   +4 more
openaire   +1 more source

Photochemical reduction of nanocrystalline maghemite to magnetite

Nanoscale, 2021
We present a method for the photochemical conversion of the inverse spinel iron oxides in which the mixed-valent magnetite phase (Fe3O4) is accessed from the maghemite phase (γ-Fe2O3) via a stable, colloidal nanocrystal-to-nanocrystal transformation.
Hankyeol Jung, Alina M. Schimpf
openaire   +2 more sources

Biomedical applications of maghemite ferrofluid

Biochimie, 1998
The use of cell-targeted ferrofluid in the characterization of modifications of cell membranes is reviewed. Maghemite ferrofluid was synthesized by the Massart method, complexed with dimercaptosuccinic acid (FF). Cell targeting by FF was developed by coupling FF to various biological effectors such as antibodies, lectins, etc, which enabled magnetic ...
A, Halbreich, J, Roger, J N, Pons, D, Geldwerth, M F, Da Silva, M, Roudier, J C, Bacri   +6 more
openaire   +2 more sources

Temperature dependence of the hyperfine parameters of maghemite and al-substituted maghemites

Physics and Chemistry of Minerals, 1995
Synthetic aluminum-substituted maghemite samples, γ-(Al y Fe1-y )2O3 with y=0, 0.032, 0.058, 0.084, 0.106 and 0.151 have been studied by Mossbauer spectroscopy at 8 K and in the range 80 K to 475 K at steps of 25 K. The spectra have been analysed as a superposition of two sextets composed of asymmetrical Lorentzians ...
G. M. da Costa, E. De Grave, L. H. Bowen, P. M. A. de Bakker, R. E. Vandenberghe   +4 more
openaire   +1 more source

Magnetoviscous Effect in a Maghemite Ferrofluid

Journal of Nanoscience and Nanotechnology, 2011
An iron oxide ferrofluid with mean particle size of 10.6 nm was synthesized by co-precipitation. The nanoparticles were characterized using X-ray diffraction, transmission electron microscopy, electron energy loss spectroscopy, and dynamic light scattering.
E, Ghasemi, A, Mirhabibi, M, Edrissi
openaire   +2 more sources

Rapid Synthesis and Characterization of Maghemite Nanoparticles

Journal of Nanoscience and Nanotechnology, 2008
Fe2O3–SiO2 nanocomposites were prepared by a sol–gel method using various evaporation surface to volume (S/V) ratios ranging from 0.03 to 0.2. The Fe2O3–SiO2 sols were gelated at various temperatures ranging from 50 °C to 70 °C, and subsequently they were calcined in air at 400 °C for 4 hours.
Tural, Bilsen, Oezenbas, Macit, Atalay, Selcuk, Volkan, Muervet   +3 more
openaire   +3 more sources