Chemical and magnetic properties characterization of magnetic nanoparticles

2015 ◽  
Author(s):  
Elisa Bertolucci ◽  
Anna Maria Raspolli Galletti ◽  
Claudia Antonetti ◽  
Mirko Marracci ◽  
Bernardo Tellini ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Properties Characterization

scholarly journals Novel Benchtop Magnetic Particle Spectrometer for Process Monitoring of Magnetic Nanoparticle Synthesis

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2277
Author(s):  
Norbert Löwa ◽  
Dirk Gutkelch ◽  
Ernst-Albrecht Welge ◽  
Roland Welz ◽  
Florian Meier ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Process Monitoring ◽  
Magnetic Nanoparticle ◽  
Magnetic Particle ◽  
Nanoparticle Synthesis ◽  
Separation Processes ◽  
Magnetic Detector ◽  
Application Fields

Magnetic nanoparticles combine unique magnetic properties that can be used in a variety of biomedical applications for therapy and diagnostics. These applications place high demands on the magnetic properties of nanoparticles. Thus, research, development, and quality assurance of magnetic nanoparticles requires powerful analytical methods that are capable of detecting relevant structural and, above all, magnetic parameters. By directly coupling nanoparticle synthesis with magnetic detectors, relevant nanoparticle properties can be obtained and evaluated, and adjustments can be made to the manufacturing process in real time. This work presents a sensitive and fast magnetic detector for online characterization of magnetic nanoparticles during their continuous micromixer synthesis. The detector is based on the measurement of the nonlinear dynamic magnetic response of magnetic nanoparticles exposed to an oscillating excitation at a frequency of 25 kHz, a technique also known as magnetic particle spectroscopy. Our results underline the excellent suitability of the developed magnetic online detection for coupling with magnetic nanoparticle synthesis based on the micromixer approach. The proven practicability and reliability of the detector for process monitoring forms the basis for further application fields, e.g., as a monitoring tool for chromatographic separation processes.

scholarly journals Perspective: Ferromagnetic Liquids

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2712 ◽  
Author(s):  
Robert Streubel ◽  
Xubo Liu ◽  
Xuefei Wu ◽  
Thomas P. Russell
Keyword(s):  
Surface Tension ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Remanent Magnetization ◽  
Recent Progress ◽  
Liquid Interfaces ◽  
Spin Frustration ◽  
Future Directions ◽  
Potential Applications

Mechanical jamming of nanoparticles at liquid–liquid interfaces has evolved into a versatile approach to structure liquids with solid-state properties. Ferromagnetic liquids obtain their physical and magnetic properties, including a remanent magnetization that distinguishes them from ferrofluids, from the jamming of magnetic nanoparticles assembled at the interface between two distinct liquids to minimize surface tension. This perspective provides an overview of recent progress and discusses future directions, challenges and potential applications of jamming magnetic nanoparticles with regard to 3D nano-magnetism. We address the formation and characterization of curved magnetic geometries, and spin frustration between dipole-coupled nanostructures, and advance our understanding of particle jamming at liquid–liquid interfaces.

Magnetic Characterization of CoFe2O4 Nanoparticles

2003 ◽  
Vol 789 ◽  
Author(s):  
G. Lawes ◽  
B. Naughton ◽  
D. R. Clark ◽  
A. P. Ramirez ◽  
R. Seshadri
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Ac Susceptibility ◽  
Measurement Techniques ◽  
Anomalous Behavior ◽  
Magnetic Characteristics ◽  
Magnetic Characterization ◽  
Wide Range ◽  
Co Precipitation

We have synthesized CoFe2O4 nanoparticles with length scales ranging from 3.5 nm to 14.2 nm. We have characterized the magnetic properties of these samples using both DC and AC magnetization, and find some slightly anomalous behavior in two of the samples. We tentatively attribute these features to interactions between the magnetic nanoparticles.There is a great deal of interest in understanding the physical basis for the magnetic properties of nanoparticles in order to facilitate their incorporation into a wide range of commercial applications. By studying the magnetic characteristics of CoFe2O4 nanoparticles using bulk measurement techniques, we are able to probe the properties of both the individual nanoparticles and interactions in these systems. In this report, we discuss our magnetic characterization of a series of CoFe2O4 nanoparticles grown using an aqueous co-precipitation technique. In addition to DC magnetization at fixed fields and temperatures, we also investigated the magnetic properties using AC susceptibility measurements. The long term goal of this research is to understand interparticle interactions in magnetic nanoparticles.

Magnetic properties characterization of shear-textured 4 wt% Si electrical steel sheet

2016 ◽  
Vol 31 (24) ◽  
pp. 3930-3938 ◽  
Author(s):  
Andrew B. Kustas ◽  
Srinivasan Chandrasekar ◽  
Kevin P. Trumble
Keyword(s):  
Magnetic Properties ◽  
Steel Sheet ◽  
Electrical Steel ◽  
Image Position ◽  
Electrical Steel Sheet ◽  
Properties Characterization

Abstract

Fabrication and characterization of tunable magnetic nanocomposite materials

2002 ◽  
Vol 734 ◽  
Author(s):  
M. Dikeakos ◽  
L.D. Tung ◽  
T. Veres ◽  
A. Stancu ◽  
L. Spinu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
High Frequency ◽  
Nanocomposite Materials ◽  
Soft Magnetic Materials ◽  
Complex Permeability ◽  
Soft Magnetic ◽  
Cold Pressed ◽  
Near Future

ABSTRACTFerromagnetic nanocomposites in which magnetic nanoparticles are embedded into a polymeric matrix can replace conventional ferrites in the near future in applications such as: filters, high frequency inductors, chokes, sensors, core-shape and planar transformers, hybrid circuits and transponders. These dense magneto-dielectrics will provide a new approach in the fabrication of soft magnetic materials. In a magnetic/polymeric nanocomposite solid, the resistivity can be drastically increased, leading to significantly reduced eddy-current losses. In addition, the coupling between neighbouring magnetic nanoparticles results in much better soft magnetic properties at high frequencies than those of conventional bulk materials or ferrites. In order to study the influence of dipolar interactions between ferritic nanoparticles, samples of varying ferritic density were prepared. A polymeric binder (pre-swollen in toluene) was added to the nanoparticles, which were then cold-pressed using a standard compaction method. Characterization of the materials was carried out by means of x-ray diffractometry, electron microscopy, magnetometry, and high-frequency complex permeability measurements. Initial results show that tunable static and dynamic magnetic properties of the nanocomposite materials may be achievable.

scholarly journals Physical characterization of biomedical magnetic nanoparticles using multi-detector centrifugal field-flow fractionation

2021 ◽  
Vol 7 (2) ◽  
pp. 327-330
Author(s):  
Amani Remmo ◽  
Norbert Löwa ◽  
Julija Peter ◽  
Frank Wiekhorst
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Accurate Determination ◽  
Field Flow Fractionation ◽  
Centrifugal Field ◽  
Technical Approach ◽  
Present Distribution ◽  
Flow Fractionation

Abstract The unique magnetic properties of magnetic nanoparticles (MNP) combined with their small size already led to numerous medical applications. Accurate determination of their magnetic properties is a key requirement enquired by users, that is impeded by the ever-present distribution of MNP sizes. Field flow fractionation (FFF) techniques may help to overcome these limitations by first separating the particles before characterization. In this study, we demonstrate the use of centrifugal FFF coupled to online detectors for fractionation, structural, and magnetic characterization of MNP. The primary goal is to establish a reproducible centrifugal FFF (CF3) method for MNP fractionation We show that CF3 has the same capability as other FFF techniques in resolving the bimodal hydrodynamic size distribution present in the commercial MNP system Resovist® but is faster and more straightforward through its technical approach.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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