An Overview of Investigation for Ferrite Magnetic Nanomaterial

2018 ◽  
Vol 271 ◽  
pp. 51-63 ◽  
Author(s):  
Deleg Sangaa ◽  
Baatartsogt Khongorzul ◽  
Enkhnaran Uyanga ◽  
Narmandakh Jargalan ◽  
Namsrai Tsogbadrakh ◽  
...  
Keyword(s):  
Heat Generation ◽  
Spinel Ferrite ◽  
High Heat ◽  
Magnetic Nanomaterials ◽  
Ferrite Powder ◽  
Ion Distribution ◽  
Hyperthermia Treatment ◽  
Spinel Type ◽  
Powder Samples ◽  
Cancer Tumor

In recent time, interest to ferrite magnetic nanomaterials has considerably grown mainly due to their much promising medical and biological applications. The spinel ferrite powder samples having high heat generation ability in AC magnetic field was studied for application to hyperthermia treatment of cancer tumor. These properties of ferrites are strongly depending on their chemical composition, ion distribution, spin orientation and method of preparation in general and crystal structure in particular nature of the material. In this study, several samples of ferrite magnetic structures were investigated by neutron diffraction. The explanation of the mechanism to occurs the heat generation ability in the magnetic materials and the electronic and magnetic states of ferrite-spinel – type structures were theoretically defined by the first-principles calculations within the framework of DFT.

High-Heat Generation Ability in AC Magnetic Field for Ti Tube Filled with Ferrite Powder

2006 ◽  
Vol 45 (11) ◽  
pp. 8673-8675 ◽  
Author(s):  
Hideyuki Hirazawa ◽  
Kodai Uchihara ◽  
Hiromichi Aono ◽  
Koichi Hiraoka ◽  
Takashi Naohara ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Generation ◽  
High Heat ◽  
Ferrite Powder ◽  
Ac Magnetic Field

Numerical Investigation of Heat Transfer in Tissues During Therapeutic Hyperthermia

2018 ◽  
Author(s):  
Saeed Tiari ◽  
Mahboobe Mahdavi ◽  
Kinjalkumar Chauhan ◽  
Davide Piovesan
Keyword(s):  
Heat Generation ◽  
Thermal Response ◽  
Generation Rate ◽  
Heat Generation Rate ◽  
Hyperthermia Treatment ◽  
Ansys Fluent ◽  
Normal Tissues ◽  
Cooling Conditions ◽  
Magnetic Nanoparticle Hyperthermia ◽  
The Impact

A numerical analysis is conducted to study the thermal behavior of human healthy and cancerous tissues during magnetic nanoparticle hyperthermia treatment. A transient multi-layer two-dimensional model is developed using commercial CFD package, ANSYS-FLUENT 18.1. The impact of therapeutic heat generation rate and various tissue cooling conditions on the thermal response of the tumor and normal tissues are investigated. It was found that the tumor temperature is not affected by different cooling conditions while the temperature of healthy tissues around tumor is significantly impacted. The results also demonstrated that the effective tumor temperature can be achieved in approximately ten minutes by using therapeutic heat generation rate of 150 kW/m3 in all three cooling conditions.

scholarly journals A Novel Composite Material Designed from FeSi Powder and Mn0.8Zn0.2Fe2O4Ferrite

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Magdalena Streckova ◽  
Radovan Bures ◽  
Maria Faberova ◽  
Pavel Kurek ◽  
Pavla Roupcova ◽  
...  
Keyword(s):  
Composite Material ◽  
Rupture Strength ◽  
Microwave Sintering ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Young Modulus ◽  
Secondary Phase ◽  
Spinel Type ◽  
Tem Analysis ◽  
Superior Mechanical Properties

A design of the novel microcomposite material composed of spherical FeSi particles and Mn0.8Zn0.2Fe2O4ferrite is reported together with a characterization of basic mechanical and electrical properties. The sol-gel autocombustion method was used for a preparation of Mn0.8Zn0.2Fe2O4ferrite, which has a spinel-type crystal structure as verified by XRD and TEM analysis. The final microcomposite samples were prepared by a combination of the traditional PM compaction technique supplemented with unconventional microwave sintering process of the prepared green compacts. The composition and distribution of the secondary phase formed by the spinel ferrite were examined by SEM. It is demonstrated that the prepared composite material has a tight arrangement without any significant porosity, which manifests itself through superior mechanical properties (high mechanical hardness, Young modulus, and transverse rupture strength) and specific electric resistivity compared to the related composite materials including resin as the organic binder.

High Heat Generation Ability in AC Magnetic Field of Y3Fe5O12 Powder Prepared Using Bead Milling

2011 ◽  
Vol 94 (12) ◽  
pp. 4116-4119 ◽  
Author(s):  
Hiromichi Aono ◽  
Hiroki Ebara ◽  
Ryota Senba ◽  
Takashi Naohara ◽  
Tsunehiro Maehara ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Generation ◽  
High Heat ◽  
Ac Magnetic Field ◽  
Bead Milling

PROCESSING OF NANO-CRYSTALLITE SPINEL FERRITE PREPARED BY CO-PRECIPITATION METHOD

2009 ◽  
Vol 23 (03) ◽  
pp. 365-374 ◽  
Author(s):  
P. MATHUR ◽  
A. THAKUR ◽  
M. SINGH
Keyword(s):  
Grain Size ◽  
Curie Temperature ◽  
Spinel Ferrite ◽  
Initial Permeability ◽  
Nano Particles ◽  
Precipitation Method ◽  
Ferrite Powder ◽  
Type Semiconductor ◽  
Phase Spinel ◽  
Co Precipitation

Mn 0.4 Cu 0.4 Zn 0.2 Fe ferrite was synthesized by soft chemical approach called co-precipitation technique. The ferrite powder was calcined, compacted and sintered at 700°C and 800°C for 3 h. The initial permeability, density, grain size, Curie temperature and dc resistivity have been studied. X-ray diffraction (XRD) method confirmed the sample to be a single-phase spinel structure without unreacted constituents. The particle size was calculated from XRD spectrum using Scherrer's formula and found to be ~55 nm. Then, nanoparticles were observed with tunneling electron microscopy (TEM). Further, scanning electron micrograph (SEM) also confirmed nano-phase and the uniformity of the particles. The initial permeability values do not exhibit much variation with temperature, except near Curie temperature, where it falls sharply. The initial permeability is found to increase with the increase in sintering temperature. This is attributed to the increase in the grain size. Calculation of activation energy indicates that the given ferrite is p-type semiconductor. Mössbauer study of these samples shows superparamagnetic behavior, which also confirms the formation of nano-particles. Possible models and mechanisms contributing to these processes have been discussed.

scholarly journals Terrestrial Heat Flow in New Zealand

2021 ◽  
Author(s):  
◽  
Om Prakash Pandey
Keyword(s):  
New Zealand ◽  
Heat Flow ◽  
Heat Generation ◽  
Plate Tectonics ◽  
High Heat ◽  
The North ◽  
Rock Types ◽  
Flow Heat ◽  
Geophysical Anomalies ◽  
First Time

<p>In this regional heat flow study of New Zealand temperatures have been measured in available boreholes using a specially constructed thermistor probe, and existing temperature information has been incorporated from various sources including oil prospecting boreholes. Thermal conductivity has been measured in the laboratory on 581 samples. Newly determined values of heat flow are given for 105 locations; values for the South Island are here presented for the first time. Most of the heat flow values have been grouped in eight regions based on the level of heat flow. This classification can be related to the occurrence of certain surface manifestations and geophysical anomalies, and to regional plate tectonics. High heat flow in three regions is consistent with melting conditions being reached at depths between 35km and 45km. These are the Taranaki Region, the West Coast Region and the Great South Basin. The average regional heat flow for these regions varies from 86.4 mW/m2 to 110.7 mW/m2. Much lower heat flow is obtained in the Hikurangi and Marlborough-Canterbury Regions; these may possibly be interconnected. Elsewhere the heat flow is low to normal with isolated highs. The broad distribution of heat flow in the North Island is typical for an active subduction region. Radioactive heat generation has been measured on rock types from various localities, and large variations have been found. The heat flow - heat generation relationship has been studied for 42 sites. A linear relationship is found only in the Taranaki and Hikurangi Regions. Temperature calculations show large differences in the deep-seated temperature distribution beneath New Zealand, and this has also been reflected in the distribution of "reduced heat flow". Temperature and heat flow can be correlated with upper mantle inhomogeneity. The inferred variation of radioactive heat generation with depth has been studied for areas beneath the Western Canterbury Region. A mean heat generation of 1.56 plus-minus .07 muW/m3 has been found in a sequence which has been inferred to occur between 17km and 30km in depth under the region; this is very much higher than the usually adopted values for the lower crust. Normal heat flow observed in the Western Cook Strait Region, and the existence of good seismic wave transmission beneath the same region, can be attributed to crustal and lithospheric thickening. The relevance of present study to petroleum occurrences has been examined and it is found that in areas of proven hydrocarbon potential the heat flow is high.</p>

scholarly journals Terrestrial Heat Flow in New Zealand

2021 ◽  
Author(s):  
◽  
Om Prakash Pandey
Keyword(s):  
New Zealand ◽  
Heat Flow ◽  
Heat Generation ◽  
Plate Tectonics ◽  
High Heat ◽  
The North ◽  
Rock Types ◽  
Flow Heat ◽  
Geophysical Anomalies ◽  
First Time

<p>In this regional heat flow study of New Zealand temperatures have been measured in available boreholes using a specially constructed thermistor probe, and existing temperature information has been incorporated from various sources including oil prospecting boreholes. Thermal conductivity has been measured in the laboratory on 581 samples. Newly determined values of heat flow are given for 105 locations; values for the South Island are here presented for the first time. Most of the heat flow values have been grouped in eight regions based on the level of heat flow. This classification can be related to the occurrence of certain surface manifestations and geophysical anomalies, and to regional plate tectonics. High heat flow in three regions is consistent with melting conditions being reached at depths between 35km and 45km. These are the Taranaki Region, the West Coast Region and the Great South Basin. The average regional heat flow for these regions varies from 86.4 mW/m2 to 110.7 mW/m2. Much lower heat flow is obtained in the Hikurangi and Marlborough-Canterbury Regions; these may possibly be interconnected. Elsewhere the heat flow is low to normal with isolated highs. The broad distribution of heat flow in the North Island is typical for an active subduction region. Radioactive heat generation has been measured on rock types from various localities, and large variations have been found. The heat flow - heat generation relationship has been studied for 42 sites. A linear relationship is found only in the Taranaki and Hikurangi Regions. Temperature calculations show large differences in the deep-seated temperature distribution beneath New Zealand, and this has also been reflected in the distribution of "reduced heat flow". Temperature and heat flow can be correlated with upper mantle inhomogeneity. The inferred variation of radioactive heat generation with depth has been studied for areas beneath the Western Canterbury Region. A mean heat generation of 1.56 plus-minus .07 muW/m3 has been found in a sequence which has been inferred to occur between 17km and 30km in depth under the region; this is very much higher than the usually adopted values for the lower crust. Normal heat flow observed in the Western Cook Strait Region, and the existence of good seismic wave transmission beneath the same region, can be attributed to crustal and lithospheric thickening. The relevance of present study to petroleum occurrences has been examined and it is found that in areas of proven hydrocarbon potential the heat flow is high.</p>

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