Size-dependent nonlinear weak-field magnetic behavior of maghemite nanoparticles

Autor: Laurence Motte, Vincent Russier, Caroline de Montferrand, Dominique Bonnin, N. Lièvre, Marc Lecouvey, Yoann Lalatonne, Philippe Monod
Přispěvatelé: Chimie, Structures et Propriétés de Biomatériaux et d'Agents Thérapeutiques (CSPBAT), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Institut de Chimie du CNRS (INC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2011
Předmět:
Optics and Photonics
[SDV.BIO]Life Sciences [q-bio]/Biotechnology
Nanoparticle
Maghemite
Metal Nanoparticles
02 engineering and technology
01 natural sciences
Ferric Compounds
law.invention
Nuclear magnetic resonance
X-Ray Diffraction
law
Electrochemistry
Nanotechnology
General Materials Science
[INFO.INFO-BT]Computer Science [cs]/Biotechnology
MESH: Nanotechnology
education.field_of_study
Condensed matter physics
MESH: Metal Nanoparticles
MESH: X-Ray Diffraction
Temperature
021001 nanoscience & nanotechnology
MESH: Temperature
Magnetic field
SQUID
MESH: Biotechnology
MESH: Microscopy
Electron
Transmission
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
MESH: Ferric Compounds
0210 nano-technology
Algorithms
Superparamagnetism
Biotechnology
Materials science
Population
MESH: Algorithms
engineering.material
010402 general chemistry
MESH: Hydrodynamics
Biomaterials
Magnetization
Magnetics
Microscopy
Electron
Transmission
MESH: Magnetics
MESH: Particle Size
Particle Size
education
MESH: Electrochemistry
General Chemistry
0104 chemical sciences
engineering
Hydrodynamics
Magnetic nanoparticles
Nanoparticles
MESH: Optics and Photonics
MESH: Nanoparticles
Zdroj: Small
Small, Wiley-VCH Verlag, 2012, 8 (12), pp.1945-56. ⟨10.1002/smll.201102660⟩
ISSN: 1613-6829
1613-6810
DOI: 10.1002/smll.201102660⟩
Popis: International audience; The magnetic behavior at room temperature of maghemite nanoparticles of variable sizes (from 7 to 20 nm) is compared using a conventional super quantum interference device (SQUID) and a recently patented technology, called MIAplex. The SQUID usually measures the magnetic response versus an applied magnetic field in a quasi-static mode until high field values (from -4000 to 4000 kA m(-1)) to determine the field-dependence and saturation magnetization of the sample. The MIAplex is a handheld portable device that measures a signal corresponding to the second derivative of the magnetization around zero field (between -15 and 15 kA m(-1)). In this paper, the magnetic response of the size series is correlated, both in diluted and powder form, between the SQUID and MIAplex. The SQUID curves are measured at room temperature in two magnetic field ranges from -4000 to 4000 kA m(-1) (-5T to 5T) and from -15 to 15 kA m(-1). Nonlinear behavior at weak fields is highlighted and the magnetic curves for diluted solutions evolve from quasi-paramagnetic to superparamagnetic behavior when the size of the nanoparticles increases. For the 7-nm sample, the fit of the magnetization with the Langevin model weighted with log-normal distribution corresponds closely to the magnetic size. This confirms the accuracy of the model of non-interacting superparamagnetic particles with a magnetically frustrated surface layer of about 0.5 nm thickness. For the other samples (10-nm to 21-nm), the experimental weak-field magnetization curves are modeled by more than one population of magnetically responding species. This behavior is consistent with a chemically uniform but magnetically distinct structure composed of a core and a magnetically active nanoparticle canted shell. Accordingly the weak-field signature corresponds to the total assembly of the nanoparticles. The impact of size polydispersity is also discussed.
Databáze: OpenAIRE
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