scholarly journals Frequency dependence of magnetothermal properties for magnetic fluid and magnetically functionalized implants

2018 ◽  
Vol 185 ◽  
pp. 09003
Author(s):  
R.T. Salakhova ◽  
A. G. Vylegzhanin ◽  
E.A. Kashtanov ◽  
V.I. Zverev ◽  
R. Müller ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Frequency Dependence ◽  
Magnetic Fluid ◽  
Magnetite Nanoparticles ◽  
Polymer Coating ◽  
Experimental Setup ◽  
Ac Magnetic Field ◽  
Magnetic Heating ◽  
Magnetite Particles

Heating of the magnetic nanoparticles in AC magnetic field is the effect promising for application in medicine. The mechanisms of heating in AC-magnetic field implies nontrivial dependence of the power dissipated by magnetic nanoparticles on frequency. With the use of a reconfigurable experimental setup, this frequency-dependent magnetic heating was measured on two characteristic examples: the magnetite nanoparticles conventionally used in medicine and polymer coating with micrometer sized magnetite particles. The saturation of the heating power with frequency is shown that is more pronounced for the second case of microparticles.

scholarly journals Magnetoviscosity of a Magnetic Fluid Based on Barium Hexaferrite Nanoplates

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1870
Author(s):  
Dmitry Borin ◽  
Robert Müller ◽  
Stefan Odenbach
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Magnetic Nanoparticles ◽  
External Magnetic Field ◽  
Shear Flow ◽  
Magnetic Fluid ◽  
Barium Hexaferrite ◽  
Dipole Interaction ◽  
Field Dependent ◽  
Fluid Behaviour

This paper presents the results of an experimental study of the influence of an external magnetic field on the shear flow behaviour of a magnetic fluid based on barium hexaferrite nanoplates. With the use of rheometry, the magnetoviscosity and field-dependent yield-stress in the fluid are evaluated. The observed fluid behaviour is compared to that of ferrofluids with magnetic nanoparticles having high dipole interaction. The results obtained supplement the so-far poorly studied topic of the influence of magnetic nanoparticles’ shape on magnetoviscous effects. It is concluded that the parameter determining the observed magnetoviscous effects in the fluid under study is the ratio V2/l3, where V is the volume of the nanoparticle and l is the size of the nanoparticle in the direction corresponding to its orientation in the externally applied magnetic field.

On the in Vitro Hyperthermia of Magnetic Fluid in AC Magnetic Field

2009 ◽  
Author(s):  
Junfeng Jiang ◽  
Ruoyu Hong ◽  
Xiaohui Zhang ◽  
Hongzhong Li
Keyword(s):  
Magnetic Field ◽  
Magnetic Fluid ◽  
Volume Fraction ◽  
Maximum Temperature ◽  
Magnetic Fluid Hyperthermia ◽  
Ac Magnetic Field ◽  
Hyperthermia Therapy ◽  
Good Biocompatibility ◽  
High Chemical Stability

Hyperthermia therapy for cancer has attracted much attention nowadays. The study on the heat transfer in the magnetic fluid and the tumor is crucial for the successful application of magnetic fluid hyperthermia (MFH). Water-based Fe3O4 magnetic fluid is expected to be a most appropriate candidate for MFH due to the good biocompatibility, high saturation magnetization, super-paramagnetization and high chemical stability. In this paper, we explore the heat generation and transfer in magnetic fluid which is placed under an AC magnetic field. It is found that the amplitude and the frequency of alternating magnetic field, particle size and volume fraction have a pronounce influence on maximum temperature of hyperthermia.

Enhancement of cumulative photoirradiated and ac magnetic-field induced cancer (HeLa) cell killing efficacy of mixed α and γ-Fe2O3 magnetic nanoparticles

2012 ◽  
Vol 36 (5) ◽  
pp. 1201 ◽  
Author(s):  
Md. Shariful Islam ◽  
Yoshihumi Kusumoto ◽  
Md. Abdulla-Al-Mamun ◽  
Yuji Horie ◽  
Hirotaka Manaka
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Hela Cell ◽  
Cell Killing ◽  
Ac Magnetic Field

scholarly journals The Use of Magnetite Nanoparticles in Applied Medicine

2011 ◽  
Vol 694 ◽  
pp. 205-208 ◽  
Author(s):  
Аndrey Nikolaevich Belousov
Keyword(s):  
Magnetic Field ◽  
Magnetite Nanoparticles ◽  
Cell Metabolism ◽  
Intensive Therapy ◽  
Total Activity ◽  
Biological Action ◽  
Surface Proteins ◽  
Magnetite Particle ◽  
High Sorption ◽  
Magnetite Particles

Nowadays nanotechnology as a new direction of science allows to develop therapeutic methods of the endogenous intoxication syndrome and to create a new class of biocompatible sorbents. In Ukraine first preparations of medical nanotechnology were produced and patented in 1998. These are “IKBB” intracorporeal biocorrector, magnet-controlled sorbent (MCS-B), and “Micromage-B”. The preparations are based on colloid magnetite particles (Fe3O4) from 6 to 12 nm. Adsorption layer provides a high sorption activity to magnetite nanoparticles. Total activity of their sorption surface is 800 – 1200 m2/g, magnetic field intensity produced by each particle is 300 - 400 kA/m, ζ – potential is – 19 mV. Each magnetite particle is a subdomain elementary magnetite of a sphere shape. The main biological action of nanotechnology preparations is direct to regulation of cell metabolism. Therapeutic effect of this preparation is based on the influence of adsorption process and of constant magnetic field that surrounds colloid magnetite particle on cellular and subcellular structures. Point of attack is surface proteins of cell membranes. Colloid magnetite particles modify composition of protein molecules thereby effecting transport of substances to a cell. Using magnet-controlled sorbent the method of extracorporal hemocorrection on the whole is rather the method of effective and reliable way to activate natural processes of detoxication of organism, than the method of artificial detoxication. The absence of contra-indication and incidental effects (haematic, haemodynamic, hormone, electrolytic, immune) creates real predisposition for using this method in intensive therapy of intoxication syndrome.

Analysis and Experimental Study on Magnetic Fluid Seal Mechanism

2011 ◽  
Vol 492 ◽  
pp. 273-276 ◽  
Author(s):  
Hai Na Zhang ◽  
De Cai Li
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Field Distribution ◽  
Magnetic Fluid ◽  
Magnetic Field Distribution ◽  
Gas Flows ◽  
Experimental Setup ◽  
Pressure Transmission ◽  
The Magnetic Field ◽  
The Way

The authors put forward a new design of experimental setup in order to study the mechanism of magnetic fluid seal, and used Ansys to simulate the magnetic field distribution in the setup, the results prove its rationality. The experiment to study the way of pressure transmission has been done on the experimental setup. The experimental conclusion shows that pressure transmission is based on the recoverability of the magnetic fluid seal. When pressure exceeds the ability of the seal stage, there is a leak path in the magnetic fluid, and then the gas flows to the next stage, after that, the leak path disappears. Pressure transmits from one seal stage to the next one in this way.

scholarly journals The analysis of 2,3-dicarboxypropane-1,1-diphosphonic acid-coated magnetite nanoparticles under an external magnetic field and their radiolabeling for possible theranostic applications

2019 ◽  
Vol 43 (15) ◽  
pp. 5932-5939
Author(s):  
Marko Perić ◽  
Magdalena Radović ◽  
Marija Mirković ◽  
Aleksandar S. Nikolić ◽  
Predrag Iskrenović ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
External Magnetic Field ◽  
Cancer Detection ◽  
Magnetite Nanoparticles ◽  
Diphosphonic Acid ◽  
Theranostic Agents ◽  
Theranostic Applications

The advances in nanotechnology are directed towards the development of new theranostic agents based on magnetic nanoparticles that can be used for both cancer detection and treatment.

scholarly journals Ultrasonic Studies of Emulsion Stability in the Presence of Magnetic Nanoparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
A. Józefczak ◽  
R. Wlazło
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Acoustic Waves ◽  
Magnetic Particles ◽  
Emulsion Stability ◽  
High Energy ◽  
Pickering Emulsions ◽  
Ultrasound Waves ◽  
Acoustic Study ◽  
Magnetite Particles

Pickering emulsions are made of solid particle-stabilized droplets suspended in an immiscible continuous liquid phase. A magnetic emulsion can be obtained using magnetic particles. Solid magnetic nanoparticles are adsorbed strongly at the oil-water interface and are able to stabilize emulsions of oil and water. In this work emulsions stabilized by magnetite nanoparticles were obtained using high-energy ultrasound waves and a cavitation mechanism and, next, their stability in time was tested by means of acoustic waves with a low energy, without affecting the structure. An acoustic study showed high stability in time of magnetic emulsions stabilized by magnetite particles. The study also showed a strong influence of an external magnetic field, which can lead to changes of the emulsion properties. It is possible to control Pickering emulsion stability with the help of an external stimulus—a magnetic field.

Irradiation of Synthesized Magnetic Nanoparticles and its Application for Hyperthermia

2008 ◽  
Vol 47-50 ◽  
pp. 1298-1301 ◽  
Author(s):  
Kwo Ping Chang ◽  
Ching Han Cheng ◽  
Ying Chi Chiang ◽  
Shan Chih Lee ◽  
Chih Yuan Lin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Nanoparticles ◽  
Taguchi Method ◽  
Alternating Current ◽  
Quality Characteristic ◽  
Optimal Conditions ◽  
Ac Magnetic Field ◽  
Coated Nanoparticles ◽  
Principal Method

Hyperthermia using ferrofluid with alternating current (AC) magnetic field, which is the principal method we try to use in this study, where chitosan was used as a surfactant agent. Irradiation of Co-60 plays multi-function roles on the syntheses of chitosan-coated nanoparticles. Optimal conditions for synthesizing magnetic nanoparticles have been successfully found by the Taguchi method in which the dominated quality characteristic was SAR.

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