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  1. Article

    Open Access

    Exchange-bias and magnetic anisotropy fields in core–shell ferrite nanoparticles

    Exchange bias properties of MnFe \(_2\) 2 ...

    F. G. Silva, J. Depeyrot, Yu. L. Raikher, V. I. Stepanov… in Scientific Reports (2021)

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  2. No Access

    Article

    Local Structure Investigation of Core-Shell CoFe2O4@γ-Fe2O3 Nanoparticles

    We investigate the local structure of nanoparticles based on cobalt ferrite core with and without a hydrothermal surface treatment of variable duration of time that promotes a coating shell by crossing informa...

    F. H. Martins, F. L. O. Paula, R. C. Gomes, J. A. Gomes… in Brazilian Journal of Physics (2021)

  3. No Access

    Article

    Hydrothermal synthesis of mixed zinc–cobalt ferrite nanoparticles: structural and magnetic properties

    We synthesize Zn-substituted cobalt ferrite (Zn x Co1−x Fe2O4, with 0 ≤ x ≤ 1) magnetic nanoparticles by a hydrothermal co-precipitation method in ...

    P. Coppola, F. G. da Silva, G. Gomide, F. L. O. Paula… in Journal of Nanoparticle Research (2016)

  4. No Access

    Article

    Influence of the spatial confinement at nanoscale on the structural surface charging in magnetic nanocolloids

    In this work we focus on the surface charging properties of core shell ferrite nanoparticles dispersed in water, namely magnetic nanocolloids. This structural charge results from the Brönsted acid-base behavio...

    A. F. C. Campos, R. Aquino, F. A. Tourinho… in The European Physical Journal E (2013)

  5. No Access

    Article

    Using speciation diagrams to improve synthesis of magnetic nanosorbents for environmental applications

    This work addresses environmental applications of magnetic nanoparticles. We highlight the chemical design of filtration aids based on magnetic nanoferrites coated with specific ligands potentially used in mag...

    A. F. C. Campos, R. Aquino, T. A. P. G. Cotta… in Bulletin of Materials Science (2011)

  6. No Access

    Chapter and Conference Paper

    Surface spin disorder in nickel ferrite nanomagnets studied by in-field Mössbauer spectroscopy

    The magnetic structure of NiFe2O4 nanoparticles has been investigated by means of Mössbauer spectra at T = 4.2 K in applied fields up to 12 T. Four samples were studied, with mean particle diameters ranging from ...

    H. R. Rechenberg, E. C. Sousa, J. Depeyrot, M. H. Sousa, R. Aquino… in ICAME 2007 (2009)

  7. No Access

    Article

    Surface spin disorder in nickel ferrite nanomagnets studied by in-field Mössbauer spectroscopy

    The magnetic structure of NiFe2O4 nanoparticles has been investigated by means of Mössbauer spectra at T = 4.2 K in applied fields up to 12 T. Four samples were studied, with mean particle diameters ranging from ...

    H. R. Rechenberg, E. C. Sousa, J. Depeyrot, M. H. Sousa… in Hyperfine Interactions (2008)

  8. No Access

    Chapter and Conference Paper

    Synthesis and room temperature magnetic and magneto-optical characterization of size-controlled nickel nanoferrite based ferrofluids

    Nickel ferrite nanoparticles are synthesized bottom up and then peptized in aqueous media resulting in stable magnetic fluids. X-ray powder diffraction and transmission electronic microscopy permit the investi...

    M. H. Sousa, F. A. Tourinho, J. Depeyrot, E. Dubois… in Surface and Colloid Science (2004)

  9. No Access

    Chapter and Conference Paper

    Speciation diagrams as a useful tool to improve nanoparticle surface–ligand complexation for biocompatible magnetic colloids

    Biomedical applications of magnetic carriers are based on the specific interaction between the particle surface and ligands like meso-2,3-dimercaptosuccinic acid. Such cross-linking agents are polyfunctional Brön...

    A. F. C. Campos, T. A. P. G. Cotta… in Trends in Colloid and Interface Science XV… (2004)

  10. No Access

    Article

    Nanoparticles superficial density of charge in electric double-layered magnetic fluid: A conductimetric and potentiometric approach

    We analyze potentiometric and conductimetric measurements simultaneously performed on Electric Double-Layer Magnetic Fluid based on cobalt ferrite nanoparticles, in order to obtain the pH-dependence of the partic...

    A.F.C. Campos, F.A. Tourinho, G.J. da Silva… in The European Physical Journal E (2001)

  11. No Access

    Article

    Nanoparticle chain-like formation in electrical double-layered magnetic fluids evidenced by small-angle X-ray scattering

    Small-angle X-ray scattering (SAXS) was performed on a series of Electric Double-Layered Magnetic Fluids (EDL-MF) composed of ferrite type-- CoFe2O4, MnFe2O4, ZnFe2O4, NiFe2O4 and CuFe2O4--nanoparticles of differ...

    R. Itri, J. Depeyrot, F.A. Tourinho, M.H. Sousa in The European Physical Journal E (2001)

  12. No Access

    Article

    Observation of the Wannier-Stark ladders associated to the light-hole ground state and to the heavy-hole first excited state in GaInAs/AlGaInAs superlattices

    Photoluminescence excitation experiments have been performed with a non-intentionally doped GaInAs/AlGaInAs superlattice lattice-matched to an InP substrate. The superlattice is the intrinsic part of a p-i-n d...

    G. Wang, R. Demory, P. Tronc, J. Depeyrot, R. Melliti, J. C. Harmand… in Il Nuovo Cimento D (1995)