Magnetic behaviour of iron oxide nanoparticles dispersed in a silica matrix

Caizer, Costică; Savii, Cecilia; Popovici, Mihaela

doi:10.1016/s0921-5107(02)00403-8

Cited by 35 publications

(32 citation statements)

References 41 publications

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“…First, the fitted values for C are, within error, comparable to the value reported for the bulk crystalline anisotropy constant of γ-Fe 2 O 3 of 4.7 kJ=m 3 [40] and consistent with the range of values observed for M-280 beads [41]. Second, the fact that the effective volume NV is only a small fraction of the total bead volume or even total NP volume suggests that only a small portion of the NPs' magnetization contributes to the anisotropy.…”

Section: Prl 114 218301 (2015) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 83%

Biological Magnetometry: Torque on Superparamagnetic Beads in Magnetic Fields

et al. 2015

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Superparamagnetic beads are widely used in biochemistry and single-molecule biophysics, but the nature of the anisotropy that enables the application of torques remains controversial. To quantitatively investigate the torques experienced by superparamagnetic particles, we use a biological motor to rotate beads in a magnetic field and demonstrate that the underlying potential is π periodic. In addition, we tether a bead to a single DNA molecule and show that the angular trap stiffness increases nonlinearly with magnetic field strength. Our results indicate that the superparamagnetic beads' anisotropy derives from a nonuniform intrabead distribution of superparamagnetic nanoparticles.

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Section: Prl 114 218301 (2015) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 83%

Biological Magnetometry: Torque on Superparamagnetic Beads in Magnetic Fields

et al. 2015

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“…One of the most interesting and practically promising fields is the research on magnetic nanoparticles for their attractive properties and many potential applications, such as in radio immunology [7,8], cell separation processes [9] and catalysis [10,11]. Recently, ferromagnetic materials have gained much intense research on biomedical and biotechnological applications.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Fe3O4 Nanoparticles Modified Electrode and Its Application for Voltammetric Sensing of Dopamine

Fang¹,

Wang²,

Zhang³

et al. 2005

Electroanalysis

100

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Magnetic nanoparticles of Fe 3 O 4 approximately 5nm in size were synthesized and characterized by XRD and TEM. A novel gold electrode modified with Fe 3 O 4 nanoparticles was then constructed and was characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The modified electrode exhibited strong promoting effect and high stability toward the electrochemical oxidation of dopamine (DA), which gave reversible redox peaks with a formal potential of 0.192 V (vs. Ag/AgCl) electrode in pH 7.0 phosphate buffer solution (PB). The anodic peak currents (measured by constant potential amperometry) increased linearly with the concentration of dopamine in the range of 1.5 Â 10 À7 to 4.0 Â 10 À4 M. The detection limit (S/N ¼ 3) obtained was 3.0 Â 10 À8 M. The relative standard deviation (RSD) of 8 successive scans was 3.41% for 1.5 Â 10 À6 M DA. The interference of ascorbic acid (AA) could be eliminated efficiently. The proposed method showed excellent sensitivity and recovery.

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“…However, the magnetic behavior of iron--containing nanoparticles was strongly dependent on technology of sample preparation [2]. Magnetite (Fe 3 O 4 ) nanorods and porous hematite (α-Fe 2 O 3 ) nanorods were prepared [3] through hydrolysis of FeCl 3 and FeSO 4 solutions.…”

Section: Introductionmentioning

confidence: 99%

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

et al. 2005

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Iron-containing nanoparticles and clusters were formed in silica with porosity, which was predetermined by different procedures of sol-gel technology and the chemical composition of precursors. Bulk and layer-type samples of different porosity were synthesized and investigated. The morphology, magnetic, and optical properties were studied to characterize the samples and to analyze the formation of Fe-oxides. Experimental results showed that both Fe 2 O 3 and Fe 3 O 4 were formed in the samples and that their relative amount was dependent on preparation technology.

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Magnetic behaviour of iron oxide nanoparticles dispersed in a silica matrix

Cited by 35 publications

References 41 publications

Biological Magnetometry: Torque on Superparamagnetic Beads in Magnetic Fields

Biological Magnetometry: Torque on Superparamagnetic Beads in Magnetic Fields

Fabrication of Fe3O4 Nanoparticles Modified Electrode and Its Application for Voltammetric Sensing of Dopamine

Formation of Iron-Containing Clusters in Silica of Predetermined Porosity

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