Results 181 to 190 of about 24,751 (224)

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
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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

Spin-canting and transverse relaxation in maghemite nanoparticles and in tin-doped maghemite

Journal of Magnetism and Magnetic Materials, 2006
Abstract The magnetic properties of maghemite nanoparticles and tin-doped maghemite have been studied by 57 Fe and 119 Sn Mossbauer spectroscopy at temperatures from 6 to 300 K with and without applied magnetic fields. The low-temperature 57 Fe spectra of both samples, obtained in a field of 4 T, can be described in terms of A-site and B-site ...
Örn Helgason, Helge K. Rasmussen, Steen Mørup   +2 more
openaire   +1 more source

Maghemite Nanoparticles by View of Mossbauer Spectroscopy

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Jirí, Tucek, Radek, Zboril, Dimitris, Petridis   +2 more
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Maghemite in Icelandic basalts

Mineralogical Magazine, 1992
AbstractCurie temperatures indicating non-titaniferous magnetite are common in Icelandic basalts of all ages, especially Tertiary ones. Yet, microprobe analyses of such samples have shown high titanium in the magnetite. To resolve this paradox, and the mechanism at work, the magnetic mineral fraction of eight basalt samples with Js-T curves ...
S. Steinthorsson, Ö. Helgason, M. B. Madsen, C. Bender Koch, M. D. Bentzon, S. Mørup   +5 more
openaire   +1 more source

Photoacoustic investigation of maghemite-based nanocomposite

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2013
Photoacoustic spectroscopy was used to investigate magnetic nanocomposites incorporating nanosized maghemite particles into styrene-divinylbenzene copolymer template. Typical photoacoustic features were observed in bands C, S and L in the wavelength region of 300-1000 nm.
A F R, Rodriguez, M F S, Gilhermitti, F S E D V, Faria, R M, Cunha, J G, Santos, A C, Oliveira, M A, Morales, D, Rabelo, R B, Azevedo, P C, Morais   +9 more
openaire   +2 more sources

Variable-Temperature Mössbauer Spectroscopy of Nano-Sized Maghemite and Al-Substituted Maghemites

Clays and Clay Minerals, 1995
AbstractSynthetic aluminum-substituted maghemite samples, γ-(Fe1-xAlx)2O3, have been prepared by thermal decomposition of Al-lepidocrocite (γ-Fe1-xAlxOOH), with × = 0, 0.04, 0.06, 0.14 and 0.18. The particles are needle-shaped and the mean crystallite diameter along the [311] crystallographic direction was found to be between 2.0 and 5.0 nm.
G. M. Da Costa, E. De Grave, L. H. Bowen, P. M. A. De Barker, R. E. Vandenberghe   +4 more
openaire   +1 more source

Spin frustration in maghemite nanoparticles

Solid State Communications, 2001
Abstract A different degree of internal structural disorder is observed in almost identical and uniform γ-Fe2O3 nanoparticles of about 3.5±0.6 nm, prepared by laser pyrolysis, by high-resolution transmission electron microscopy (HRTEM) and Mossbauer spectroscopy.
C.J. Serna, F. Bødker, S. Mørup, M.P. Morales, F. Sandiumenge, S. Veintemillas-Verdaguer   +5 more
openaire   +1 more source