scholarly journals Investigation of the physicochemical properties of magnetic nanoparticles: size, magnetic properties, concentration

2021 ◽  
Vol 931 (1) ◽  
pp. 012011
Author(s):  
VN Kuryakov ◽  
I V Sergeev ◽  
O O Efanova ◽  
O K Zheludkova
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Physicochemical Properties ◽  
Number Concentration ◽  
Scattering Method ◽  
Particle Sizes ◽  
Time Intervals ◽  
Aqueous Dispersions ◽  
Dynamic Scattering

Abstract This work presents the results of studies of a series of samples of aqueous dispersions of magnetic nanoparticles. The particle sizes were measured for these samples by the dynamic scattering method. Using the method of ultramicroscopy, the number concentration of particles in the samples and the concentration of particles remaining in the volume of the samples after exposure to a magnetic field at various time intervals were measured.

scholarly journals Bio-Catalysis and Biomedical Perspectives of Magnetic Nanoparticles as Versatile Carriers

2019 ◽  
Vol 5 (3) ◽  
pp. 42 ◽  
Author(s):  
Muhammad Bilal ◽  
Shahid Mehmood ◽  
Tahir Rasheed ◽  
Hafiz M. N. Iqbal
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Molecular Level ◽  
State Of The Art ◽  
Volume Ratio ◽  
Controlled Drug Delivery ◽  
High Mass ◽  
Biological Interactions ◽  
Magnetic Carriers

In recent years, magnetic nanoparticles (MNPs) have gained increasing attention as versatile carriers because of their unique magnetic properties, biocatalytic functionalities, and capabilities to work at the cellular and molecular level of biological interactions. Moreover, owing to their exceptional functional properties, such as large surface area, large surface-to-volume ratio, and mobility and high mass transference, MNPs have been employed in several applications in different sectors such as supporting matrices for enzymes immobilization and controlled release of drugs in biomedicine. Unlike non-magnetic carriers, MNPs can be easily separated and recovered using an external magnetic field. In addition to their biocompatible microenvironment, the application of MNPs represents a remarkable green chemistry approach. Herein, we focused on state-of-the-art two majorly studied perspectives of MNPs as versatile carriers for (1) matrices for enzymes immobilization, and (2) matrices for controlled drug delivery. Specifically, from the applied perspectives of magnetic nanoparticles, a series of different applications with suitable examples are discussed in detail. The second half is focused on different metal-based magnetic nanoparticles and their exploitation for biomedical purposes.

scholarly journals Evaluation of Magnetic Parameters and Kinetics of the Magnetic Nanoparticles in High Magnetic Fields and its Potential Applications

2020 ◽  
Vol 8 (A) ◽  
pp. 24-36
Author(s):  
Mark Christopher Arokiaraj ◽  
Aleksandr Liubimtcev
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Flux Density ◽  
7 Tesla ◽  
High Magnetic Fields ◽  
Drag Forces ◽  
Magnetic Strength ◽  
Motion Characteristics

BACKGROUND: Multifunctional nanoparticles are known for their wide range of biomedical applications. Controlling the magnetic properties of these nanoparticles is imperative for various applications, including therapeutic angiogenesis. AIM: The study was performed to evaluate the magnetic properties and their control mechanisms by the external magnetic field. METHODS: A100 nm magnetic nanoparticle was placed in the magnetic field, and parametrically, the magnet field strength and distance were evaluated. Various models of magnetic strength and disposition were evaluated. Magnetic flux density, force/weight, and magnetic gradient strength were the parameters evaluated in the electromagnetic computational software. RESULTS: The seven-coil method with three centrally placed coils as Halbach array, and each coil with a flux density of 7 Tesla, and with a coil dimension of 20 cm × 20 cm (square model) of each coil showed a good magnetic strength and force/weight parameters in a distance of 15 cm from the centrally placed coil. The particles were then evaluated for their motion characteristics in saline. It showed good displacement and acceleration properties. After that, the particles were theoretically assessed in a similar mathematical model after parametrically correcting the drag force. After the application of high drag forces, the particles showed adequate motion characteristics. When the particle size was reduced further, the motion characteristics were preserved even with high drag forces. CONCLUSION: There is potential for a novel method of controlling multifunctional magnetic nanoparticles using high magnetic fields. Further studies are required to evaluate the motion characteristics of these particles in vivo and in vitro.

To the Theory of Hyperthermia Effect Induced by Magnetic Nanoparticles

2015 ◽  
Vol 233-234 ◽  
pp. 771-775 ◽  
Author(s):  
Andrey Zubarev ◽  
Ali Abu-Bakr
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Heat Production ◽  
Particle Rotation ◽  
Carrier Liquid ◽  
Linearly Polarized ◽  
Dilute Suspension ◽  
Oscillating Magnetic Field ◽  
Ferromagnetic Particles

In this paper, we present results of theoretical modeling of the rise of temperature for the unit of time in a dilute suspension of the fiber ferromagnetic particles under the action of the linearly polarized oscillating magnetic field. Two mechanisms of the heat production, namely the particle rotation in the liquid and its internal remagnetization are considered. We study effect of the particle shape, its magnetic properties and rheological properties of the carrier liquid on the rise of temperature for the unit of time by the particles.

scholarly journals Directing the orientational alignment of anisotropic magnetic nanoparticles using dynamic magnetic fields

2015 ◽  
Vol 181 ◽  
pp. 449-461 ◽  
Author(s):  
Daniel Hoffelner ◽  
Matthias Kundt ◽  
Annette M. Schmidt ◽  
Emmanuel Kentzinger ◽  
Philipp Bender ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Microscopy ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Rotating Magnetic Fields ◽  
X Ray ◽  
X Ray Scattering ◽  
Field Geometry ◽  
The Magnetic Field

The structure-directing influence of static and dynamic, i.e. rotating, magnetic fields on the orientational alignment of spindle-type hematite particles with a high aspect ratio is investigated. Structural characterization using electron microscopy and small-angle X-ray scattering confirms a nearly collinear particle arrangement with orientation of the main particle axis either parallel or perpendicular to the substrate as directed by the magnetic field geometry. The combination of large structural and magnetocrystalline anisotropies results in significantly different, strongly anisotropic magnetic properties of the assemblies revealed by directional magnetization measurements.

scholarly journals Evaluation of Magnetic Parameters and Kinetics of the Magnetic Nanoparticles in High Magnetic Fields

2019 ◽  
Author(s):  
Mark Christopher Arokiaraj ◽  
Aleksandr Liubimtcev
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Flux Density ◽  
7 Tesla ◽  
High Magnetic Fields ◽  
Drag Forces ◽  
Magnetic Strength ◽  
Motion Characteristics

Background: Multifunctional nanoparticles are known for their wide range of biomedical applications. Controlling the magnetic properties of these nanoparticles is imperative for various applications, including therapeutic angiogenesis. The study was performed to evaluate the magnetic properties and their control mechanisms by the external magnetic field. Methods: A 100nm magnetic nanoparticle was placed in the magnetic field, and parametrically the magnet field strength and distance was evaluated. Various models of magnetic strength and disposition were evaluated. Magnetic flux density, force/weight, and magnetic gradient strength were the parameters evaluated in electromagnetic computational software. Results: The seven-coil method with three centrally placed coils as Halbach array, and each coil with a flux density of 7 Tesla, and with a coil dimension of 20cmx20cm (square model) of each coil showed a good magnetic strength and force/weight parameters in a distance of 15cm from the centrally placed coil. The particles were then evaluated for their motion characteristics in saline. It showed good displacement and acceleration properties. After that, the particles were theoretically assessed in a similar mathematical model after parametrically correcting the drag force. After application of high drag forces, the particles showed adequate motion characteristics. When the particle size was reduced further, the motion characteristics were preserved even with high drag forces. Conclusion: There is potential for a novel method of controlling multifunctional magnetic nanoparticles using high magnetic fields. Further studies are required to evaluate the motion characteristics of these particles in-vivo and invitro.

Quasistatic Magnetic Properties and Dynamic Hysteretic Losses in (La,Sr)MnO3 Nanoparticles Fabricated by Different Technological Routes

2015 ◽  
Vol 230 ◽  
pp. 101-107
Author(s):  
Alexander I. Tovstolytkin ◽  
S.O. Solopan ◽  
V.M. Kalita ◽  
S.M. Ryabchenko ◽  
Anatolii G. Belous
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Alternating Magnetic Field ◽  
Magnetic Characteristics ◽  
Specific Loss ◽  
Heating Efficiency ◽  
Specific Loss Power

Structural and magnetic characteristics of (La,Sr)MnO3 nanoparticles synthesized by different methods have been studied in the work. The specific loss power which is released on the exposure of an ensemble of synthesized particles to alternating magnetic field was calculated and measured experimentally. The contributions to the specific loss power resulted from different heating mechanisms have been discussed. The directions to enhance the heating efficiency of various kinds of magnetic nanoparticles are outlined

scholarly journals Material Characterization of Strontium Ferrite Powders for Producing Sintered Magnets by Ceramic Injection Molding (MagnetPIM)

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Dietmar Drummer ◽  
Susanne Messingschlager
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Injection Molding ◽  
Material Characterization ◽  
Strontium Ferrite ◽  
Filling Ratio ◽  
Particle Sizes ◽  
Binder System ◽  
Ceramic Injection Molding

For this study, different strontium ferrite powders were mixed with a filling ratio of about 60 vol% in a binder system and formed into green compacts. During the process of injection molding, a magnetic field was generated in the tool via a magnetic coil, which enables magnetization and orientation of the ceramic particles. All powders were successfully processed by MagnetPIM. The investigations identified that it is impossible to extrapolate from the magnetic properties of a green compact to the magnetic properties of a sintered part. It became obvious, though, that, when producing very strong magnetic parts by MagnetPIM, the best results can be obtained by using powders with small particle sizes.

Investigation of the Structure and Magnetic Properties of Bulk Amorphous FeCoYB Alloy

2017 ◽  
Vol 68 (9) ◽  
pp. 2162-2165 ◽  
Author(s):  
Katarzyna Bloch ◽  
Mihail Aurel Titu ◽  
Andrei Victor Sandu
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Hyperfine Field ◽  
Irreversible Processes ◽  
Magnetization Process ◽  
Casting Method ◽  
The Core ◽  
Injection Casting ◽  
Core Losses ◽  
Microstructural Studies

The paper presents the results of structural and microstructural studies for the bulk Fe65Co10Y5B20 and Fe63Co10Y7B20 alloys. All the rods obtained by the injection casting method were fully amorphous. It was found on the basis of analysis of distribution of hyperfine field induction that the samples of Fe65Co10Y5B20 alloy are characterised with greater atomic packing density. Addition of Y to the bulk amorphous Fe65Co10Y5B20 alloy leads to the decrease of the average induction of hyperfine field value. In a strong magnetic field (i.e. greater than 0.4HC), during the magnetization process of the alloys, where irreversible processes take place, the core losses associated with magnetization and de-magnetization were investigated.

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