Nano-Magnetic Materials

2021 ◽  
pp. 174-210
Keyword(s):  
Magnetic Properties ◽  
Composite Materials ◽  
Magnetic Materials ◽  
Magnetic Nanocomposite ◽  
Magnetic Nanocomposites ◽  
Magnetic Composite ◽  
Crystalline Core

The utilization of traditional magnetic materials and magnetic composite materials have been developing quickly in recent decades. The build of magnetic properties has been created, with pursuing the inclusion of a few diverse nanoparticles to formulate magnetic nanocomposite crystalline core. This chapter contains theories and characterization of magnetic nanocomposites that are compared with variant traditional magnetic materials. Finally, this chapter sheds light on regulations, forecast, and recommendations for manufactures for using new multi-nanocomposites magnetic materials in electrical applications.

Synthesis and Characterization of Magnetic Al/NiO Composite Pigments with Low Infrared Emissivity

2017 ◽  
Vol 898 ◽  
pp. 1561-1568 ◽  
Author(s):  
Yun Feng Liu ◽  
Jian Liang Xie ◽  
Mei Luo ◽  
Bo Peng ◽  
Long Jiang Deng
Keyword(s):  
Magnetic Properties ◽  
Efficient Method ◽  
Spectral Reflectance ◽  
Synthesis And Characterization ◽  
Magnetic Composite ◽  
Infrared Emissivity ◽  
Flowing Liquid ◽  
Aluminum Flake ◽  
Addition Amount

Generally, traditional low infrared coatings based on metallic pigments cannot have low lightness, low infrared emissivity and low radar reflectivity simultaneously. Herein, we used a simple and efficient method to synthesize magnetic Al/NiO composite pigments which possessed all these attributes to a degree. The results indicated that the covering area of NiO on the aluminum flake could be tuned by the addition amount of NiCO3 and the reaction temperature of hot-flowing, both of which played a key role on the VIS/IR spectral reflectance and magnetic properties. The magnetic Al/NiO composite pigments with low lightness and low infrared emissivity could be obtained at 130 °C for 24 h in hot flowing liquid. The lightness L* could be decreased to 75.94, however the infrared emissivity (8-14 μm) was also low to 0.421. Compared with the single aluminum flakes, the Al/NiO magnetic composite pigments presented stronger magnetic properties. Therefore, the Al/NiO magnetic composite pigments offered a new choice for the pigments of multispectral stealth coating.

Preparation and characterization of polystyrene-based magnetic nanocomposites. Thermal, mechanical and magnetic properties

2001 ◽  
Vol 41 (11) ◽  
pp. 1845-1852 ◽  
Author(s):  
Daniel López ◽  
Ione Cendoya ◽  
Francesc Torres ◽  
Javier Tejada ◽  
Carmen Mijangos
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanocomposites

scholarly journals OBTAINING HYSTERESIS LOOPS AT LOW FREQUENCY FOR CHARACTERIZATION OF MATERIALS TO BE USED IN BIOMEDICAL APPLICATIONS

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Atika Arshad ◽  
Rumana Tasnim ◽  
Sheroz Khan ◽  
A.H.M Zahirul Alam
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Magnetic Materials ◽  
Research Work ◽  
Low Frequency ◽  
Hysteresis Loops ◽  
Simple Circuit ◽  
Characterization Of Materials

The promising development of magnetic sensors in biomedical field demands an appropriate level of understanding of the magnetic properties of the materials used in their fabrication. To date only few of the types of magnetic materials are encountered where their magnetic properties, characterization techniques and magnetization behavior are yet to be explored more suitably in the light of their applications. This research work studies the characterization of materials by using a cost effective and simple circuit consisting of inductive transducer and an OP-AMP as a voltage integrator. In this approach the circuit was simulated using PSPICE and experiments have been conducted to achieve the desired results. The simulation and experimental results are obtained for three test materials namely iron, steel and plastic. The novelty lies in applying the simple circuit for material testing and characterization via obtaining simulation results and validating these results through experiment. The magnetic properties in low external magnetic field are studied with materials under test. The magnetization effect of a magneto-inductive sensor is detected in low frequency range for different magnetic core materials. The results have shown magnetization behaviour of magnetic materials due to the variation of permeability and magnetism. The resulted hysteresis loops appeared to have different shapes for different materials. The magnetic hysteresis loop found for iron core demonstrated a bigger coercive force and larger reversals of magnetism than these of steel core, thus obtaining its magnetic saturation at a larger magnetic field strength. The shape of the hysteresis loop itself is found to be varying upon the nature of the material in use. The resulted magnetization behaviors of the materials proved their possible applicability for use in sensing devices. The key concern of this work is found upon selecting the appropriate magnetic materials at the desired frequency of operation for magneto resistive applications, magneto-resistive sensors and for an extensive range of biomedical sensor application. 

Preparation and characterization of novel magnetic nanocomposite-bonded metalloporphyrins as biomimetic nanocatalysts

2010 ◽  
Vol 14 (09) ◽  
pp. 825-831 ◽  
Author(s):  
Chang-Xiang Liu ◽  
Qiang Liu ◽  
Can-Cheng Guo ◽  
Ze Tan
Keyword(s):  
Electron Microscopy ◽  
Magnetic Nanocomposite ◽  
Magnetic Nanocomposites ◽  
Solid Mixture ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Amidation Reaction ◽  
Bet Method ◽  
Input Ratio

In this work, novel magnetic nanocomposite-bonded metalloporphyrins were synthesized by an effective silanation approach between 3-aminopropyltriethoxysilane derivatized metalloporphyrins and silica-coated magnetic Fe3O4 nanoparticles. The initial metalloporphyrin derivatives were synthesized by the amidation reaction of metalloporphyrin acyl chloride with 3-aminopropyltriethoxysilane. After the metalloporphyrin derivatives were adsorbed on the surface of silica-coated magnetic Fe3O4 nanoparticles, the solid mixture was heated under vacuum at 110 °C for 3 h and then thoroughly washed with chloroform. The obtained magnetic nanocomposite-bonded metalloporphyrins were characterized by elemental analyzer, low-temperature N2 adsorption (BET method), transmission electron microscopy, UV-vis spectroscopy, and infrared spectroscopy. Interestingly, using this particular silanation method, metalloporphyrins could be quantitative-immobilized in magnetic nanocomposites by controlling the input ratio of metalloporphyrins and silica-coated magnetic Fe3O4 nanoparticles. The excellent catalytic activity and recyclability of the magnetic nanocomposite-bonded metalloporphyrins were demonstrated in the cyclohexane oxidation with iodosylbenzene.

AFM Characterization of Composite Materials Containing Iron in a Resin Host Based on Styrene and Divinylbenzene

2005 ◽  
Vol 11 (S03) ◽  
pp. 166-169 ◽  
Author(s):  
L. C. de Santa Maria ◽  
M. A. S. Costa ◽  
L. F. Senna ◽  
M. R. Silva ◽  
R. A. Simao
Keyword(s):  
Magnetic Properties ◽  
Composite Materials ◽  
Metal Oxides ◽  
Phase Difference ◽  
Morphological Features ◽  
Iron Particles ◽  
Complete Evaluation ◽  
Surface Iron

The development of composite materials containing small metal or metal oxides particles has attracted a great deal of attention for their interesting chemical, physical and magnetic properties, providing their use for several technological applications. However, it is necessary that a complete evaluation of the morphological features of these composite be performed and correlated to the above mentioned properties. Therefore, the aim of this work was to use VP-SEM and AFM to investigate the morphology and the phase difference of composite materials based on styrene (STY) and divinylbenzene (DVB), containing iron particles. MFM analysis was also carried out to verify the magnetic properties of surface iron particles.

scholarly journals Fabrication and characterization of magnetic nanocomposites by electric fields assisted electrospinning

2019 ◽  
Vol 23 (4) ◽  
pp. 2365-2372 ◽  
Author(s):  
Yanhua Song ◽  
Lan Xu ◽  
Jianhua Sui
Keyword(s):  
Electron Microscopy ◽  
Electric Fields ◽  
Composite Nanofibers ◽  
Magnetic Nanocomposites ◽  
Magnetic Composite ◽  
Fabrication And Characterization ◽  
Conductive Properties ◽  
Copper Ring ◽  
Scanning Electron

A magnetic and electric fields assisted electrospinning, in which a charged copper ring was placed between the needle and the two paralleled magnets receivers, was presented to produce aligned polyacrylonitrile/graphene/Fe3O4 (PAN/Gr/Fe3O4) magnetic composite nanofibers. Characterizations of the magnetic composite nanofibers were investigated by means of scanning electron microscopy, Fourier transform infrared spectroscopy, high-resistance meter, and other methods. The results showed that Gr and Fe3O4 nanoparticles are suitable additives to improve alignment degree and conductive properties of nanofibers.

scholarly journals Analysis of Magnetic Properties of Iron-Resin-Ferrite Soft Magnetic Composite Materials

2021 ◽  
Vol 140 (1) ◽  
pp. 64-71
Author(s):  
Z. Birčáková ◽  
P. Kollár ◽  
J. Füzer ◽  
M. Streckova ◽  
J. Szabó ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Composite Materials ◽  
Magnetic Composite ◽  
Soft Magnetic ◽  
Soft Magnetic Composite

scholarly journals Composite Materials Based on Iron Oxide Nanoparticles and Polyurethane for Improving the Quality of MRI

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4316
Author(s):  
Luiza Madalina Gradinaru ◽  
Mihaela Barbalata Mandru ◽  
Mioara Drobota ◽  
Magdalena Aflori ◽  
Maria Butnaru ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Composite Materials ◽  
Iron Oxide Nanoparticles ◽  
Magnetic Particles ◽  
Oxide Nanoparticles ◽  
Magnetic Composite ◽  
Hematite Fe2o3

Polyether urethane (PU)-based magnetic composite materials, containing different types and concentrations of iron oxide nanostructures (Fe2O3 and Fe3O4), were prepared and investigated as a novel composite platform that could be explored in different applications, especially for the improvement of the image quality of MRI investigations. Firstly, the PU structure was synthetized by means of a polyaddition reaction and then hematite (Fe2O3) and magnetite (Fe3O4) nanoparticles were added to the PU matrices to prepare magnetic nanocomposites. The type and amount of iron oxide nanoparticles influenced its structural, morphological, mechanical, dielectric, and magnetic properties. Thus, the morphology and wettability of the PU nanocomposites surfaces presented different behaviours depending on the amount of the iron oxide nanoparticles embedded in the matrices. Mechanical, dielectric, and magnetic properties were enhanced in the composites’ samples when compared with pristine PU matrix. In addition, the investigation of in vitro cytocompatibility of prepared PU nanocomposites showed that these samples are good candidates for biomedical applications, with cell viability levels in the range of 80–90%. Considering all the investigations, we can conclude that the addition of magnetic particles introduced additional properties to the composite, which could significantly expand the functionality of the materials developed in this work.

Sign in / Sign up

Export Citation Format

Share Document