Magnetic Properties of Magnetic Hydrogels

2015 ◽  
Vol 233-234 ◽  
pp. 310-313
Author(s):  
L.V. Nikitin ◽  
A.A. Gladkov ◽  
A.E. Korovushkin
Keyword(s):  
Magnetic Properties ◽  
Coercive Field ◽  
Remanent Magnetization ◽  
Magnetic Particles ◽  
Polyacrylamide Gel ◽  
Magnetization Curves ◽  
Iron Particles ◽  
Mean Size ◽  
The Mean

Several samples of magnetic hydrogels (also known as ferrogels) are prepared, and their magnetic properties are examined. Polyacrylamide gel is used as the base. Gel matrices are filled with the nanopowder: iron particles with the mean size about 30 nm. The magnetization curves of the samples are measured at different stages of de-swelling. The dependencies of such parameters of magnetization curves as coercive field, remanent magnetization from concentration of magnetic particles in the sample along the process of drying were investigated.

Magnetic Hydrogels: Magnetic and Mechanical Measurements

2012 ◽  
Vol 190 ◽  
pp. 637-640 ◽  
Author(s):  
L.V. Nikitin ◽  
A.A. Gladkov ◽  
A.L. Nikitin ◽  
A.E. Korovushkin ◽  
A.L. Nikolaev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Elastic Properties ◽  
Uniform Magnetic Field ◽  
Magnetic Phase ◽  
Magnetization Curves ◽  
Iron Particles ◽  
Mechanical Measurements ◽  
Magnetoelastic Properties ◽  
Mean Size ◽  
The Mean

Several species of magntic hydrogels (ferrogels) are prepared, and their magnetic and magnetoelastic properties are examined. Three substance are used as the bases: agarose, polyacrylamide and Pluronic. All the gel matrices are filled with the same nanopowder: iron particles with the mean size about 30 nm. The critical concentrations of the magnetic phase, above which the normal gel networks cease to form, are estimated. The magnetization curves of the samples are measured at different stages of de-swelling, and their elastic properties are tested under a uniform magnetic field. The results indicate field-induced rigidity of magnetic hydrogels

Aerosol Synthesis and Growth Mechanism of Magnetic Iron Nanoparticles

2007 ◽  
Vol 534-536 ◽  
pp. 9-12 ◽  
Author(s):  
D. Kim ◽  
E.S. Vasilieva ◽  
A.G. Nasibulin ◽  
D.W. Lee ◽  
Oleg V. Tolochko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Nanoparticles ◽  
Growth Behavior ◽  
Inert Gas ◽  
Iron Particles ◽  
Magnetic Oxide ◽  
Gas Atmosphere ◽  
Experimental Parameters ◽  
Mean Size ◽  
The Mean

Magnetic oxide-coated iron nanoparticles with the mean size ranging from 6 to 75 nm were synthesized by aerosol method using iron carbonyl as a precursor under the flowing inert gas atmosphere. Oxide shells were formed by passivation of as-prepared iron particles. The influence of experimental parameters on the nanoparticles’ microstructure, phase composition and growth behavior as well as magnetic properties were investigated and discussed in this study.

scholarly journals Modeling the Magnetocaloric Effect of Nd0.67Ba0.33Mn0.98 Fe0.02O3 by the Mean Field Theory

2020 ◽  
Author(s):  
Mohamed Hsini ◽  
Sadok Zemni
Keyword(s):  
Field Theory ◽  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Fields ◽  
Magnetocaloric Effect ◽  
Mean Field Theory ◽  
Mean Field ◽  
Entropy Change ◽  
Magnetization Curves ◽  
The Mean

In this paper, we have exploited the mean field theory combined with the Bean-Rodbell model to justify the magnetocaloric effect (MCE) in Nd0.67Ba0.33Mn0.98Fe0.02O3 sample. The simulation of some magnetic properties has been investigated. Modeling magnetization curves have been successfully achieved using this model. The second-order ferromagnetic-paramagnetic (FM-PM) phase transition of our system has been verified through the value of the parameter which controls the transition nature in the Bean-Rodbell model. Theoretical and experimental expressions, which have rated the magnetic entropy change ( − ∆ S M ) under various magnetic fields, have been derived. Theoretical ( − ∆ S M ) curves have been compared to the experimental ones.

MICROSTRUCTURAL DEPENDENCE OF MAGNETIC PROPERTIES OF Sb5+ SUBSTITUTED LITHIUM FERRITES

2012 ◽  
Vol 26 (32) ◽  
pp. 1250204
Author(s):  
M. V. K. MEHER ◽  
K. SAMATHA ◽  
K. V. RAMESH ◽  
A. SATISH KUMAR
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Remanent Magnetization ◽  
Initial Permeability ◽  
Lithium Ferrite ◽  
Substitution Saturation ◽  
Morphological Studies ◽  
Lithium Ferrites ◽  
The Mean ◽  
Ceramic Route

This paper reports the influence of antimony substitution on the magnetic properties of Lithium ferrite sintered at 1200°C. The samples with compositional formula [ Li 0.5+x Sb x Fe 2.5-2x] O 4 (where x = 0.0, 0.1, 0.3, 0.6, 0.8 and 1.0) were prepared by standard ceramic route method. The Curie temperature (Tc) was found to be highest at 720°C for x = 0 compound and decreased with increasing x (i.e., Sb 5+ substitution). Saturation magnetization, coericivity, remanent magnetization were studied as a function of Sb content and grain size. The results of initial permeability showed anomalous variations as x varied from 0.0 to 1.0. The maximum initial permeability was observed for x = 0.3 compound. The morphological studies were performed by SEM and the mean diameter of the grain size of the samples was determined and showed correlation with magnetic properties.

scholarly journals Electric and Magnetic Properties of Recycled NdFeB-Natural Rubber Composites

2011 ◽  
Vol 20 (2) ◽  
pp. 096369351102000 ◽  
Author(s):  
P Jantarattana ◽  
C Sirisathitkul ◽  
A Hunyek ◽  
S Maensiri
Keyword(s):  
Magnetic Properties ◽  
Natural Rubber ◽  
Reflection Loss ◽  
Coercive Field ◽  
Remanent Magnetization ◽  
Electromagnetic Properties ◽  
Rubber Composites ◽  
Roll Mill ◽  
Natural Rubber Composites ◽  
Electrical Permittivity

Electromagnetic properties of natural rubber (NR) incorporated with recycled neodymium-iron-boron (NdFeB) powder from 0 to 120 phr by the two-roll mill technique were studied. The remanent magnetization, coercive field and logarithmic value of the electrical permittivity were linearly increased with the NdFeB loading according to the rule of mixture suggesting that interactions between NdFeB clusters were moderate. The addition of 120 phr NdFeB also increased the reflection loss of NR.

Production of Nano-Sized Co3O4 by Pyrolysis of Organic Extracts

2016 ◽  
Vol 721 ◽  
pp. 102-107 ◽  
Author(s):  
Vera Serga ◽  
Aija Krūmiņa ◽  
Mara Lubane ◽  
Gundega Heidemane ◽  
Mikhail Maiorov
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Catalytic Activity ◽  
Hexanoic Acid ◽  
Organic Extracts ◽  
Mean Size ◽  
Promising Application ◽  
The Mean ◽  
Method Of Production ◽  
Production Conditions

The most promising application field of materials based on nano-sized Co3O4 is catalysis. The method of production is one of the factors, which greatly affects the catalytic activity of Co3O4 catalysts. The aim of this research is to study possibilities of a new promising extractive-pyrolytic method (EPM) for the production of Co3O4 nanopowders and silica- and ceria-supported Co3O4 nanocomposites. Solutions of cobalt hexanoate in hexanoic acid and trioctylammonium tetrachlorocobaltate in toluene preliminary produced by solvent extraction were used as precursors. The precursors’ thermal stability, phase composition, morphology and the magnetic properties of the final products of pyrolysis were studied. The performed investigations have shown that the mean size of the Co3O4 crystallites in the materials produced by the EPM varies from amorphous to 55 nm due to the production conditions.

scholarly journals A Novel Hybrid Nanosystem Integrating Cytotoxic and Magnetic Properties as a Tool to Potentiate Melanoma Therapy

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 693 ◽  
Author(s):  
Nuno Cruz ◽  
Jacinta Oliveira Pinho ◽  
Graça Soveral ◽  
Lia Ascensão ◽  
Nuno Matela ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cellular Proliferation ◽  
Health Concern ◽  
Major Health ◽  
Transmission Electron ◽  
Mean Size ◽  
Melanoma Treatment ◽  
The Mean ◽  
Hybrid Nanosystem ◽  
Melanoma Therapy

Cancer is a major health concern and the prognosis is often poor. Significant advances in nanotechnology are now driving a revolution in cancer detection and treatment. The goal of this study was to develop a novel hybrid nanosystem for melanoma treatment, integrating therapeutic and magnetic targeting modalities. Hence, we designed long circulating and pH-sensitive liposomes loading both dichloro(1,10-phenanthroline) copper (II) (Cuphen), a cytotoxic metallodrug, and iron oxide nanoparticles (IONPs). The synthetized IONPs were characterized by transmission electron microscopy and dynamic light scattering. Lipid-based nanoformulations were prepared by the dehydration rehydration method, followed by an extrusion step for reducing and homogenizing the mean size. Liposomes were characterized in terms of incorporation parameters and mean size. High Cuphen loadings were obtained and the presence of IONPs slightly reduced Cuphen incorporation parameters. Cuphen antiproliferative properties were preserved after association to liposomes and IONPs (at 2 mg/mL) did not interfere on cellular proliferation of murine and human melanoma cell lines. Moreover, the developed nanoformulations displayed magnetic properties. The absence of hemolytic activity for formulations under study demonstrated their safety for parenteral administration. In conclusion, a lipid-based nanosystem loading the cytotoxic metallodrug, Cuphen, and displaying magnetic properties was successfully designed.

scholarly journals EFFECTS OF LOW-TEMPERATURE TREATMENT ON MAGNETIC PROPERTIES OF SM(CO,CU,FE) COMPOUNDS

2020 ◽  
pp. 149-161
Author(s):  
Елена Михайловна Семенова ◽  
Марина Борисовна Ляхова ◽  
Дмитрий Викторович Иванов ◽  
Юлия Васильевна Кузнецова ◽  
Дмитрий Юрьевич Карпенков ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Fractal Dimension ◽  
Low Temperature ◽  
Coercive Field ◽  
Remanent Magnetization ◽  
Magnetic Domain ◽  
Temperature Treatment ◽  
Homogeneous Microstructure ◽  
Low Temperature Treatment ◽  
Temperature Heat

Представлены результаты исследования микро-, нано- и магнитной доменной структуры сплавов Sm(CoCuFe) после выплавки и термических обработок. Показано, что гомогенизация и последующий низкотемпературный отжиг при 400 °С позволяют сформировать микроскопически гомогенную структуру с наноразмерными неоднородностями по составу. Такая структура позволяет реализовать в образцах коэрцитивную силу H до 32 кЭ на литых образцах. Температурные зависимости коэрцитивной силы и остаточной намагниченности образцов в диапазоне от 300 до 700 К имеют линейно убывающий характер. Показано, что наноструктуре сплава с наибольшей H соответствует фрактальная размерность D- ~ 2,3. The results on the micro- and nanostructures and on the magnetic domain structure of Sm(CoCuFe) compound are presented. It was shown that the sequential high- and low-temperature heat treatments lead to formation of a homogeneous microstructure with some nanoscale compositional heterogeneities. Such a structure provides the coercive field H of up to 32 kOe. The coercivity and remanent magnetization of the samples in the temperature range from 300 to 700 K linearly decrease. It is shown that the nanostructure of the alloy with the highest H corresponds to the fractal dimension D- ~ 2,3.

Batch Precipitation of Lead Iodide

1994 ◽  
Vol 59 (6) ◽  
pp. 1301-1304
Author(s):  
Jaroslav Nývlt ◽  
Stanislav Žáček
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Crystal Size ◽  
Lead Nitrate ◽  
Lead Iodide ◽  
Constant Rate ◽  
Mean Size ◽  
The Mean

Lead iodide was precipitated by a procedure in which an aqueous solution of potassium iodide at a concentration of 0.03, 0.10 or 0.20 mol l-1 was stirred while an aqueous solution of lead nitrate at one-half concentration was added at a constant rate. The mean size of the PbI2 crystals was determined by evaluating the particle size distribution, which was measured sedimentometrically. The dependence of the mean crystal size on the duration of the experiment exhibited a minimum for any of the concentrations applied. The reason for this is discussed.

scholarly journals Effects of topical gel formulation of Ficus carica latex on cutaneous leishmaniasis induced by Leishmania major in BALB/c mice

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Ali Pouryousef ◽  
Erfan Eslami ◽  
Sepehr Shahriarirad ◽  
Sina Zoghi ◽  
Mehdi Emami ◽  
...  
Keyword(s):  
Cutaneous Leishmaniasis ◽  
Murine Model ◽  
Leishmania Major ◽  
Considerable Effect ◽  
Ficus Carica ◽  
Control Group ◽  
Topical Gel ◽  
The Third ◽  
Mean Size ◽  
The Mean

Abstract Objectives The current study aimed to evaluate the effects of Ficus carica latex on the treatment of cutaneous leishmaniasis (CL), induced by Leishmania major. A 5% topical gel with F. carica latex was prepared. BALB/c mice were infected by inoculation of amastigotes form of L. major. Thirty BALB/c mice were divided into five groups, where the first group was treated daily, the second group twice per day, and the third group every other day with the 5% topical gel, for 3 weeks. The sizes of the lesions were measured before and during the course of treatment. Results Although the mean size of lesions in the mice group treated with the 5% F. carica gel, especially in the group receiving daily treatment, was less than the mean size of the lesions in the control group, yet, the differences was not statistically significant (p > 0.05). The findings of the current study demonstrated that the 5% F. carica latex with a 3-week course of treatment had no considerable effect in recovery or control of CL induced by L. major in the murine model. Using higher concentration of F. carica latex and with longer treatment lengths may increase its efficacy in the treatment of CL.

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