scholarly journals Studies on recording mganetic materials and magnetic composites. XII. Adsorption behavior of alkyl silane compounds on magnetic particles - Packing and orientation behavior of particles in magnetic coatings.

1986 ◽  
Vol 43 (2) ◽  
pp. 63-69 ◽  
Author(s):  
Katsuhiko NAKAMAE ◽  
Satoshi TANIGAWA ◽  
Naoto HIRAYAMA ◽  
Kenji SUMIYA ◽  
Tsunetaka MATSUMOTO
Keyword(s):  
Magnetic Particles ◽  
Adsorption Behavior ◽  
Orientation Behavior ◽  
Magnetic Composites

scholarly journals From Single-Core Nanoparticles in Ferrofluids to Multi-Core Magnetic Nanocomposites: Assembly Strategies, Structure, and Magnetic Behavior

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2178
Author(s):  
Theodora Krasia-Christoforou ◽  
Vlad Socoliuc ◽  
Kenneth D. Knudsen ◽  
Etelka Tombácz ◽  
Rodica Turcu ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Magnetic Particles ◽  
Magnetic Behavior ◽  
Oxide Nanoparticles ◽  
Magnetic Characterization ◽  
Magnetic Composites ◽  
Functional Coating ◽  
High Magnetic Moment

Iron oxide nanoparticles are the basic components of the most promising magnetoresponsive nanoparticle systems for medical (diagnosis and therapy) and bio-related applications. Multi-core iron oxide nanoparticles with a high magnetic moment and well-defined size, shape, and functional coating are designed to fulfill the specific requirements of various biomedical applications, such as contrast agents, heating mediators, drug targeting, or magnetic bioseparation. This review article summarizes recent results in manufacturing multi-core magnetic nanoparticle (MNP) systems emphasizing the synthesis procedures, starting from ferrofluids (with single-core MNPs) as primary materials in various assembly methods to obtain multi-core magnetic particles. The synthesis and functionalization will be followed by the results of advanced physicochemical, structural, and magnetic characterization of multi-core particles, as well as single- and multi-core particle size distribution, morphology, internal structure, agglomerate formation processes, and constant and variable field magnetic properties. The review provides a comprehensive insight into the controlled synthesis and advanced structural and magnetic characterization of multi-core magnetic composites envisaged for nanomedicine and biotechnology.

scholarly journals Enhancing the Low-Frequency Induction Heating Effect of Magnetic Composites for Medical Applications

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 386 ◽  
Author(s):  
Ziyin Xiang ◽  
Khao-Iam Jakkpat ◽  
Benjamin Ducharne ◽  
Jean-Fabien Capsal ◽  
Jean-François Mogniotte ◽  
...  
Keyword(s):  
Induction Heating ◽  
Magnetic Particles ◽  
Varicose Veins ◽  
Local Heating ◽  
Low Frequency ◽  
Experimental Tests ◽  
Medical Applications ◽  
Magnetic Composite ◽  
Magnetic Composites ◽  
Frequency Excitation

This study aims to enhance the low-frequency induction heating (LFIH) effect in a thermoplastic polymer doped with iron oxide magnetic particles, which are promising candidates for several medical applications thanks to their confirmed biocompatibility. Two main approaches were proposed to successfully boost the heating ability; i.e., improving the magnetic concentration of the composite with higher filler content of 30 wt %, and doubling the frequency excitation after optimization of the inductor design. To test the magnetic properties of the ferromagnetic composite, a measurement of permeability as a function of temperature, frequency, and particle content was carried out. Thermal transfer based COMSOL simulations together with experimental tests have been performed, demonstrating feasibility of the proposed approach to significantly enhance the target temperature in a magnetic composite. These results are encouraging and confirmed that IH can be exploited in medical applications, especially for the treatment of varicose veins where local heating remains a true challenge.

scholarly journals Villari Effect at Low Strain in Magnetoactive Materials

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2472 ◽  
Author(s):  
Graciela Riesgo ◽  
Laura Elbaile ◽  
Javier Carrizo ◽  
Rosario Díaz Crespo ◽  
María Ángeles García ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetic Flux ◽  
Cross Section ◽  
Magnetic Particles ◽  
Magnetic State ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
The Cross ◽  
Silicone Matrix ◽  
Villari Effect

Magnetic composites of soft magnetic FeGa particles embedded in a silicone matrix have been synthesized. The Villari effect has been studied depending on the size and concentration of the particles and on the magnetic state of the composite. The results indicate a decrease in the Villari effect when the concentration of the magnetic particles increases. These results suggest a relationship between the Villari effect and the mechanical properties of the composites. The Young’s modulus of the composites has been obtained by microindentation and their values related to the intensity and slope of the Villari signals. The results are explained on the basis that the reduction in the cross section of the composite when submitted to stress is the main origin of the variation of the magnetic flux in the Villari effect in this kind of composite. It has also been obtained that the magnetic state of the composite plays an important role in the Villari signal. When the magnetization of the composite is greater, the magnetic flux across the composite is greater too and, so, the same reduction in the cross section originates a greater Villari signal.

scholarly journals Development and Characterization of Field Structured Magnetic Composites

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2843
Author(s):  
Balakrishnan Nagarajan ◽  
Yingnan Wang ◽  
Maryam Taheri ◽  
Simon Trudel ◽  
Steven Bryant ◽  
...  
Keyword(s):  
Magnetic Particles ◽  
Monomer Conversion ◽  
Filler Loading ◽  
Magnetic Composites ◽  
Uv Curable ◽  
Epoxy Resin System ◽  
Out Of Plane ◽  
Combine Magnetic Field ◽  
Microstructural Morphology ◽  
Particle Alignment

Polymer composites containing ferromagnetic fillers are promising for applications relating to electrical and electronic devices. In this research, the authors modified an ultraviolet light (UV) curable prepolymer to additionally cure upon heating and validated a permanent magnet-based particle alignment system toward fabricating anisotropic magnetic composites. The developed dual-cure acrylate-based resin, reinforced with ferromagnetic fillers, was first tested for its ability to polymerize through UV and heat. Then, the magnetic alignment setup was used to orient magnetic particles in the dual-cure acrylate-based resin and a heat curable epoxy resin system in a polymer casting approach. The alignment setup was subsequently integrated with a material jetting 3D printer, and the dual-cure resin was dispensed and cured in-situ using UV, followed by thermal post-curing. The resulting magnetic composites were tested for their filler loading, microstructural morphology, alignment of the easy axis of magnetization, and degree of monomer conversion. Magnetic characterization was conducted using a vibrating sample magnetometer along the in-plane and out-of-plane directions to study anisotropic properties. This research establishes a methodology to combine magnetic field induced particle alignment along with a dual-cure resin to create anisotropic magnetic composites through polymer casting and additive manufacturing.

scholarly journals Preparation of Magnetic Composites Based on Bulk Amorphous Iron Alloys

2019 ◽  
Vol 56 (4) ◽  
pp. 1008-1012
Author(s):  
Bartlomiej Jez ◽  
Marcin Nabia�ek ◽  
Kinga Jez
Keyword(s):  
Magnetic Properties ◽  
Amorphous Materials ◽  
Magnetic Particles ◽  
Exchange Interactions ◽  
Soft Magnetic ◽  
Magnetic Composites ◽  
Dipole Interactions ◽  
Injection Casting ◽  
Iron Based ◽  
Properties Of Composites

Iron-based amorphous alloys are characterized by so-called soft magnetic properties. Unfortunately, the geometry of iron-based amorphous materials significantly limits the applicability of these materials. One way to expand the use of these materials is to make composites based on them. As part of this work, rapid-cooled alloys were produced using the injection casting method. On their basis, magnetic composites with the addition of a non-magnetic binder were produced. The results of the structure (XRD) and magnetic properties (VSM) tests of the produced materials are presented. The research results have shown that the decisive impact on the magnetic properties of composites is the fact of the separation of magnetic particles with a non-magnetic binder. In this case, the influence of exchange interactions is dominated by dipole interactions.

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