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Academic literature on the topic 'Magnetite Heat treatment'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Magnetite Heat treatment"

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Singh, Rajendra Kumar, A. Perumal, Govind P. Kothiyal, and A. Srinivasan. "Evolution of Magnetism in CaO-SiO2-P2O5-Na2O-Fe2O3 Bioglass Ceramics." Materials Science Forum 587-588 (June 2008): 171–74. http://dx.doi.org/10.4028/www.scientific.net/msf.587-588.171.

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We report the evolution of magnetism in bioglass ceramics 41CaO.(52-x)SiO2.4P2O5. xFe2O3.3Na2O (2 ≤ x ≤ 10 mole % Fe2O3) prepared by melt quenching technique followed by heat treatment at 1050 oC. The structural investigation revealed the presence of magnetite phase in the heat treated samples with x ≥ 2 mole % Fe2O3. Room temperature magnetic measurements showed a very weak ferrimagnetic behaviour for the sample with x = 2 mole % of Fe2O3. Samples with x > 2 mole % of Fe2O3 exhibited magnetic behavior similar to soft magnetic materials with low coercivity. The evolution of magnetic properties in these samples as a function of Fe2O3 molar concentration is correlated with the amount of magnetite phase present in them.
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Kalska-Szostko, Beata, Urszula Wykowska, Dariusz Satula, and Per Nordblad. "Thermal treatment of magnetite nanoparticles." Beilstein Journal of Nanotechnology 6 (June 23, 2015): 1385–96. http://dx.doi.org/10.3762/bjnano.6.143.

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This paper presents the results of a thermal treatment process for magnetite nanoparticles in the temperature range of 50–500 °C. The tested magnetite nanoparticles were synthesized using three different methods that resulted in nanoparticles with different surface characteristics and crystallinity, which in turn, was reflected in their thermal durability. The particles were obtained by coprecipitation from Fe chlorides and decomposition of an Fe(acac)3 complex with and without a core–shell structure. Three types of ferrite nanoparticles were produced and their thermal stability properties were compared. In this study, two sets of unmodified magnetite nanoparticles were used where crystallinity was as determinant of the series. For the third type of particles, a Ag shell was added. By comparing the coated and uncoated particles, the influence of the metallic layer on the thermal stability of the nanoparticles was tested. Before and after heat treatment, the nanoparticles were examined using transmission electron microscopy, IR spectroscopy, differential scanning calorimetry, X-ray diffraction and Mössbauer spectroscopy. Based on the obtained results, it was observed that the fabrication methods determine, to some extent, the sensitivity of the nanoparticles to external factors.
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Wang, Yao Yao, Bin Li, and Yong Ya Wang. "Characterization of Fe2O3-CaO-SiO2 Glass Ceramics Prepared by Sol-Gel." Applied Mechanics and Materials 624 (August 2014): 114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.624.114.

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Ferromagnetic glass ceramics with magnetism and biological activity could be used for magnetic induction hyperthermia. In this study Fe2O3-CaO-SiO2glass-ceramics were prepared by sol-gel method. The sample was characterized by X-ray diffraction (XRD) and differential thermal analysis (DTA). The results showed that the major phases of the sample are wollastonite and magnetite and the crystallization activation energy of sample is 189.3KJ/mol, which would provide a theoretical basis for the establishment of the optimum process conditions of heat treatment technology.
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Seo, Gyu Tae, Jin Tae Kim, Sung Su Kim, and Jutamas Kaewsuk. "Synthesis of Magnetite Nano-Particles and Powder Activated Carbon as a Novel Material for Water Treatment." Materials Science Forum 620-622 (April 2009): 145–48. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.145.

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The objective of this study is to develop a novel powder activated carbon (PAC) by surface modification with magnetite nano-particles for enhanced removal of NOM in water. The PAC used for experiment was two types, SAC (wood-based) and MAC (coal-based). First the PAC was treated by heat at 650 or 900 °C for 1hr under N2. And then the PAC surface was synthesized with magnetite nano-particles at the same condition. Adsorption tests of NOM were carried out to identify functional characteristics of the surface modified. Despite reduced surface area, adsorption capacity of the surface modified PAC was comparable to the virgin one. However much increased adsorption capacity was obtained by heat treatment of the PACs. SEC and SUVA254 results showed no specific selectivity in removal of NOM by the modification of PAC surface characteristics. Enhanced oxidation of the NOM was also observed by the magnetite nano-particle synthetic PACs in contact with ozone. Conclusively the surface modification of the PAC has high potential as a novel adsorption material for advanced water treatment.
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Ruskin, Ethel Ibinabo, Paritosh Perry Coomar, Prabaha Sikder, and Sarit B. Bhaduri. "Magnetic Calcium Phosphate Cement for Hyperthermia Treatment of Bone Tumors." Materials 13, no. 16 (August 8, 2020): 3501. http://dx.doi.org/10.3390/ma13163501.

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This article reports, for the first time, the ‘proof-of-concept’ results on magnetic monetite (CaHPO4)-based calcium phosphate cements (CPCs) compositions developed for the hyperthermia treatment of bone tumors. Hyperthermia involves the heating of a tumor within a temperature range of 40–45 °C, inducing apoptosis in the tumor cells. This process holds promising potential in the field of cancer treatment and has been proven to be more effective than conventional therapeutics. Hence, we aimed to develop cement compositions that are capable of the hyperthermia treatment of bone tumors. To achieve that central goal, we incorporated iron oxide (Fe3O4), a ferromagnetic material, into monetite and hypothesized that, upon the application of a magnetic field, magnetite will generate heat and ablate the tumor cells near the implantation site. The results confirmed that an optimized content of magnetite incorporation in monetite can generate heat in the range of 40–45 °C upon the application of a magnetic field. Furthermore, the compositions were bioactive and cytocompatible with an osteoblastic cell line.
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Włodarczyk, Agnieszka, Szymon Gorgoń, Adrian Radoń, and Karolina Bajdak-Rusinek. "Magnetite Nanoparticles in Magnetic Hyperthermia and Cancer Therapies: Challenges and Perspectives." Nanomaterials 12, no. 11 (May 25, 2022): 1807. http://dx.doi.org/10.3390/nano12111807.

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Until now, strategies used to treat cancer are imperfect, and this generates the need to search for better and safer solutions. The biggest issue is the lack of selective interaction with neoplastic cells, which is associated with occurrence of side effects and significantly reduces the effectiveness of therapies. The use of nanoparticles in cancer can counteract these problems. One of the most promising nanoparticles is magnetite. Implementation of this nanoparticle can improve various treatment methods such as hyperthermia, targeted drug delivery, cancer genotherapy, and protein therapy. In the first case, its feature makes magnetite useful in magnetic hyperthermia. Interaction of magnetite with the altered magnetic field generates heat. This process results in raised temperature only in a desired part of a patient body. In other therapies, magnetite-based nanoparticles could serve as a carrier for various types of therapeutic load. The magnetic field would direct the drug-related magnetite nanoparticles to the pathological site. Therefore, this material can be used in protein and gene therapy or drug delivery. Since the magnetite nanoparticle can be used in various types of cancer treatment, they are extensively studied. Herein, we summarize the latest finding on the applicability of the magnetite nanoparticles, also addressing the most critical problems faced by smart nanomedicine in oncological therapies.
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Liu, Boyang, Dechang Jia, Haibo Feng, Qingchang Meng, and Yingfeng Shao. "Synthesis and formation mechanism of hollow carbon spheres encapsulating magnetite nanocrystals." Journal of Materials Research 23, no. 7 (July 2008): 1980–86. http://dx.doi.org/10.1557/jmr.2008.0244.

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Hollow carbon spheres encapsulating magnetite nanocrystals were obtained in high-pressure argon at 600 °C followed by hydrolysis of Fe(NH3)2Cl2 in the hollow interiors at room temperature and heat treatment in argon at 450 °C for 2 h. The structure, morphology, and properties of the products were characterized by x-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, and vibrating sample magnetometry. The hollow carbon spheres have diameters of 1–10 μm and wall thicknesses of hundreds of nanometers; the wt% of magnetite nanocrystals in them is ∼13.2%. Equiaxed magnetite nanocrystals range in size from 15 to 90 nm, while acicular magnetite nanocrystals have diameters of ∼20 nm and lengths of 120–450 nm. The saturation magnetization value of the hollow carbon spheres encapsulating magnetite nanocrystals is 4.29 emu/g.
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Nazlan, Rodziah, Nurul Hidayah Ghazali, Nur Asyikin Ahmad Nazri, Azaima Razali, Ros Azlinawati Ramli, and Mei Lian Yuen. "Structural and Magnetic Characteristics Evaluation of Iron Oxide Extracted from Printer Toner Wastes." Materials Science Forum 1056 (March 14, 2022): 99–104. http://dx.doi.org/10.4028/p-i4liyl.

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The need to recycle and develop valuable materials from waste, and use them in various applications have become increasingly important in recent decades. Printer toner waste is one of the most polluting electronic waste due to the toxic nature of the material content in it. Despite the toxicity of the material in the toner powder, it contains iron oxide that can be extracted and recycled to make a beneficial material. Therefore, this study aims to investigate a facile and effective method to extract iron oxide from printer toner waste powder. Magnetic separation and oxidation processes were used as a method for extraction and phase conversion. The structural transformation was investigated using X-ray diffraction, microstructural observation using scanning electron microscope whereas static magnetic characteristics were investigates using vibrating sample magnetometer. The results from XRD spectra show that printer toner wastes that have been subjected to magnetic separation process and chemical treatment, even without any heat treatment process, have produced a single phase magnetite. Through the process of heat treatment on the sample, phase transformation from magnetite to hematite occurs, in which a single phase of hematite is obtained at a temperature of 1400 °C. The saturation magnetization of the sample also showed a reduction where the sample before undergoing the heat treatment process had a saturated magnetization value of 18.81 emu/g. Meanwhile, after heat treatment, the saturation magnetization value decreased to 0.42 emu/g. These results are in line with the phase transformation shown where magnetite has high ferrimagnetic characteristics, whereas hematite is basically antiferromagnetic at room temperature. However, the saturation magnetization that has been obtained in hematite shows a little difference to that of commercially sold hematite. This proves that iron oxide extracted from printer toner waste has a high potential as an alternative to existing commercial iron oxide in producing high performance magnetic materials.
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Cabrera, Flávio C., Antonio F. A. A. Melo, João C. P. de Souza, Aldo E. Job, and Frank N. Crespilho. "A flexible lab-on-a-chip for the synthesis and magnetic separation of magnetite decorated with gold nanoparticles." Lab on a Chip 15, no. 8 (2015): 1835–41. http://dx.doi.org/10.1039/c4lc01483a.

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The preparation of controlled amounts of magnetite nanoparticles decorated with gold nanoparticles without organic solvents, surfactants, or heat treatment is presented. For this, natural-rubber-based microfluidic device (NRMD) was used as a flexible lab-on-a-chip.
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Wence, Xu, Chen Weili, Jia Xiaolin, and Zhang Xuefeng. "Effect of magnetic-field heat treatment on directional growth of magnetite in glass ceramics." Materials Research Express 6, no. 7 (April 3, 2019): 075204. http://dx.doi.org/10.1088/2053-1591/ab11ac.

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Dissertations / Theses on the topic "Magnetite Heat treatment"

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Cirpar, Cigdem. "Heat Treatment Of Iron Ore Agglomerates With Microwave Energy." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605859/index.pdf.

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Pelletizing is a size enlargement technique employed to process fine-grained iron-bearing concentrates and powder ores. Mechanical strength of fired pellets is important for handling. When the pellets undergo metallurgical processing, their mechanical strength is a measure of their resistance to degradation by breakage due to impacts and abrasion to which they are exposed in the upper part of the blast furnace. In this study, heat treatment of iron ore agglomerates with microwave energy is investigated. First drying and then heat hardening tests were performed. Two main properties of pellets were taken into consideration: percent moisture and magnetite content for the dried pellets and compressive strength and also magnetite content for the fired pellets. The tests were conducted with different particle sized pellets, in different durations. In order to increase the oxidation rate in heat hardening tests, Na2O2 is also added in different percentages. The results of the study showed that, magnetite pellets can indeed be dried and heated with microwave energy. However, the attained compressive strength and v the oxidation of the fired pellets were not sufficient as compared to pellets produced by conventional heating
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Holladay, Robert Tyler. "Incorporating Magnetic Nanoparticle Aggregation Effects into Heat Generation and Temperature Profiles for Magnetic Hyperthermia Cancer Treatments." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64507.

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In treating cancer, a primary consideration is the target specificity of the treatment. This is a measure of the treatment dose that the cancerous (target) tissue receives compared to the dose that healthy tissue receives. Nanoparticle (NP) based treatments offer many advantages for target specificity compared to other forms of treatment due to their ability to selectively target tumors. One benefit of using magnetic NPs is their ability to release heat, which can both sensitize tumors to other forms of treatment as well as damage the tumor. The work here aims to incorporate a broad range of relevant physics into a comprehensive model. NP aggregation is known to be a large source of uncertainty in these treatments, thus a framework has been developed that can incorporate the effects of aggregation on NP diffusion, NP heat release, temperature rise, and overall thermal damage. To quanitify thermal damage in both healthy tissue and tumor tissue, the Cumulative Equivalent Minutes at 43 textcelsius~model is used. The Pennes bioheat equation is used as the governing equation for the temperature rise and included in it is a source heating term due to the NPs. NP diffusion and aggregation are simulated via a random walk process, with a probability of aggregation determining if nearest neighbor particles aggregate at each time step. Additionally, models are developed that attempt to incorporate aggregation effects into NP heat dissipation, though each proves to only be accurate when there is little aggregation occurring. In this work, verification analyses are done for each of the above areas and, at minimum, qualitatively accurate results have been achieved. Verification results of this work show that aggregation can be neglected at concentrations on the order of $100~nM$ or less. This however only serves as a rough estimation and further work is needed to gain a better quantitative understanding of the effects of NP concentration on aggregation. Using this concentration as a limitation, results are presented for a variety of tumor sizes and concentration distributions. Because this work incorporates a variety of physics and numerical methods into a single encompassing model, depth and physical accuracy in each area (bio-heat transfer, diffusion via random walk, NP energy dissipation, and aggregation) have been somewhat limited. This does however provide a framework in which each of the above areas can be further developed and their effects examined in the overall course of treatment.
Master of Science
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Hailer, Benjamin Thomas. "Effect of Heat Treatment on Magnetic and Mechanical Properties of an Iron-Cobalt-Vanadium-Niobium Alloy." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32135.

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Iron-cobalt-vanadium alloys can be processed to have excellent soft magnetic properties for use in high performance power generation applications such as the rotors and stators of aircraft integrated power units. These soft magnetic properties are, however, developed at the expense of mechanical strength and toughness. Small additions of niobium are reported to increase the strength of these Fe-Co-V alloys. This study evaluates the effects of heat treatment on the mechanical and magnetic properties of heavily cold work strip of a 48 wt.% iron-48 wt.% cobalt-2 wt.% vanadium alloy with a 0.3 wt.% addition of niobium. For heat treatments between 640 and 740°C for 1 hour the tensile and yield strengths and ductility of the alloy were all found to be superior to a similar alloy found in the literature without the addition of Nb and processed in a similar manner. Magnetic permeability, remnant induction, saturation induction, coercivity and core loss were only slightly degraded at all annealing temperatures when compared with the non-niobium containing alloy. All properties were shown to depend primarily on degree of recrystallization of the sample, which was found to fully recrystallize between 720 and 740 °C for 1 hour anneals. No significant change in measured properties were found when annealing time was increased to 2 hours. Full recrystallization was observed for samples annealed for as short of times as 10 minutes at 800 °C.
Master of Science
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Dall'Armellina, Erica. "Applications of 3T CMR in acute coronary syndromes (ACS)." Thesis, University of Oxford, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.589619.

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Introduction There is a pressing clinical need to treat patients with acute coronary syndrome (ACS) timely and efficiently in order to improve their prognosis. Standard tools available in ED, while useful, do not comprehensively characterize ACS for either diagnosis or risk stratification. The role of CMR in ACS is emerging because it allows assessment of both myocardial composition and function. Newer CMR techniques such as: a) T2 W imaging for assessing myocardial oedema and area at risk B) pre contrast T1 mapping techniques for quantitative characterization of the tissue composition, are adding further utility for CMR in ACS. At present the clinical use of these techniques is still limited and further investigations are needed to assess their clinical applicability in ACS patients. Aims The aims of this thesis were several. Firstly we sought to establish a CMR protocol for imaging ACS patients on a 3T CMR scanner. In order to do so, we validated a novel T2 W technique for oedema imaging (T2 prep SSFP) at 3T. Second, we aimed to perform a detailed study of the time course of oedema in ACS patients in order to establish the appropriate imaging time for the assessment of area at risk. Third, by applying T2W acute oedema imaging, we sought to investigate the functional and pathological meaning of complicated remote plaques in patients with multivessel disease. Finally, we aimed to establish whether, in comparison to standard CMR techniques, novel precontrast Tl mapping allows better characterisation of the acutely injured myocardium and whether it can predict long-term functional recovery. Methods The research studies were all performed on a 3T Trio Siemens scanner. In the initial stage of the research, we validated the T2 W technique performing phantom work and scanning both volunteers and patients to assess the uniformity of signal intensity in the myocardium and to establish a threshold based method to post process the images. We then established a CMR protocol for ACS including oedema imaging, T1 mapping imaging, perfusion, functional and late gadolinium enhancement imaging. Patients with acute myocardial infarction (both ST elevation myocardial infarction (STEMI) and non STEMI) were scanned at 4 different time points after the acute event (3 scans within 2 weeks and one at 6 months). All STEMI patients underwent primary percutaneous coronary intervention (PCI) while the non-STEMI patients underwent coronary angiography and for PCI. Results We validated the T2prep SSFP technique at 3T, highlighting its limitations and establishing a threshold of mean ± 2SD to assess myocardial oedema. We found that the optimal imaging window to assess the maximal expression of myocardial oedema was within 1 week from the acute event in patients with ST elevation MI. Also, our results showed a reduction of LGE over time (from acute to chronic) in segments which also showed improvement in contractile function indicating that even segments with transmural LGE assessed in the early hours post event could be viable. By applying these techniques in acute patients with bystander disease undergoing percutaneous coronary intervention, we found that: l) T2W imaging can detect myocardial injury downstream from a vessel identified as "non culprit" 2) in 20% of NSTEMI patients, the angiographic assessment alone failed to identify the culprit vessel. Finally, we found that the diagnostic performance of acute pre-contrast Tl-mapping was at least as good as that ofT2W CMR for detecting myocardial injury. There was a significant relationship between the segmental damaged fraction assessed by either by LGE or T2W, and mean segmental Tl values and the likelihood of improvement of segmental function at 6 months decreased progressively as acute Tl values increased. Conclusions In summary, we defined a stable imaging window for the retrospective evaluation of area at risk and we also indicated that acutely detected LGE does not necessarily equate with irreversible injury and may severely underestimate salvaged myocardium. Furthermore, in NSTEMI patients with multivessel disease, by revealing acute myocardial damage in territories pertaining to vessels not treated acutely, we raised the issue of the need for better tools for the correct identification of the culprit vessel and to stratify patients rather than by angiographic assessment alone. Finally, we demonstrated how pre-contrast Tl mapping allows for assessment of the extent of myocardial damage and how Tl mapping might become an important complementary technique to LGE and T2W for the identification of reversible myocardial injury and the prediction of functional recovery in acute MI.
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Kalkanci, Mine. "Phase Transformation And Magnetic Properties Of Multicomponent Heusler Type Alloys." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613660/index.pdf.

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Many Co-based Heusler alloys with the stoichometric composition X2YZ are ideal candidates for the spintronics applications. So, they have been extensively studied theoretically and experimentally. The aim of this work was to investigate the effect heat treatment on phase stability and magnetic properties for quaternary Co2FeSi1-xGax Heusler alloys with varying Si concentration. The Co2FeSi1-xGax alloy samples were prepared by conventional arc melting technique. The structure of Co2FeSi1-xGax bulk alloys were examined by powder x-ray diffraction and differential scanning calorimetry. It was confirmed that Co2FeSi1-xGax alloys display the L21 type structure for all x compositions based on the annealing temperature. The magnetic ordering transition temperature, Tc, was measured by differential scanning calorimetry. It was found that the order-disorder phase transition temperature from the L21 to the B2 structure, T , decreases while the Curie temperature, Tc, increases with increasing x
however, the value of these temperatures were not influenced by changing heat treatment process. The magnetic properties of Co2FeSi1-xGax alloy were investigated by using vibrating sample magnetometer. Higher saturation value was obtained at the L21 phase than the value obtained at the B2 phase. It was concluded that the Co2FeSi0.2Ga0.8 alloy was chosen optimum composition for spintronics applications because of its highest Curie temperature and phase stability of L21.
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Hollingworth, William. "Magnetic resonance imaging of the head, spine and knee : diagnosis, treatment and patients' quality of life." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624732.

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Wong, Pin Sing. "Studies on the pre-treatment of palm oil mill effluent." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/642.

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The feasibility of using hydrochloric acid (HCl), heat, dilution and magnetic stirring for the pre-treatment of palm oil mill Effluent (POME) before the primary anaerobic treatment was investigated in this study. The theoretical background of oily water emulsion which is the characteristic of POME was reviewed. A range of experiments was performed on samples made up of different combinations of the three major components of POME namely, palm oil, solid from decanter and water. The results suggest that the development of a pre-treatment system to remove the 0.5- 1.2% residue oil and 3-4% solid matter from the fresh POME is feasible thus it could improve the efficiency of further downstream POME treatment.Experiments were conducted to examine the rate of oil flotation from the mixtures of different ratios of palm oil and water treated with different concentrations of HCl, and temperatures and magnetic stirring. Similarly, a series of experiments were performed to determine the rate of solid settlement from palm oil-solid mixture, solid-water mixture and palm oil-solid-water mixture of different ratios treated with different concentrations of HCl and different temperatures. The data obtained from the experiments were used to determine the optimum dosage of HCl used and the temperature required for best oil recovery and solid settlement.From the kinetic studies, the models of the kinetic rate of palm oil flotation and solid settlement were derived. A macro kinetic modeling was adapted to the oil flotation while a power model was used for solid settling. The results showed that treatment with 0.5% HCl was sufficient to increase the rate of oil flotation significantly in Palm oil-water mixture. However, the effect was dependent on the oil-water ratio. An increase in temperature gave higher rate of oil flotation but not as great as that of HCl treatment. Dilution was found to be the two other factors that affected the rate of flotation. The solid settling rates in all tested samples were not significantly affected when they were treated with HCl. The rate of solid settlement was found to be temperature dependent. The optimum temperature for the rate of solid sedimentation was found to be in the region of 800C. Similar positive effect was also observed for a more diluted sample of Solid-Palm oil-Water mixture.
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Руденко, Лідія Федорівна, Лидия Федоровна Руденко, Lidiia Fedorivna Rudenko, and К. О. Горбенко. "Возможности закалки инструментальных сталей в магнитном поле." Thesis, Изд-во СумГУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/6391.

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Воробйов, Сергій Ігорович, Сергей Игоревич Воробьев, Serhii Ihorovych Vorobiov, Ігор Олександрович Шпетний, Игорь Александрович Шпетный, Ihor Oleksandrovych Shpetnyi, and Т. М. Шабельник. "Вплив орієнтації мультишарів на основі Co та Gd у зовнішньому магнітному полі на їх магнітні властивості." Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/40798.

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На сучасному етапі розвитку магнітоелектроніки велика увага дослідників приділяється вивченню впливу різних фізичних полів на стабільність робочих характеристик матеріалів чутливих елементів датчиків магнітного поля. Дана робота присвячена встановленню загальних закономірностей впливу температури термообробки на магнітні властивості мультишарів на основі Со і Gd при зміні їх орієнтації у зовнішньому магнітному полі.
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Bour, Pierre. "Non-invasive treatment of cardiac arrhythmias by high-intensity focussed ultrasound guided by magnetic resonance imaging." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0731/document.

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Les ultrasons focalisés de hautes intensités ont la capacité de déposer de l'énergie ultrasonore localement et de façon non invasive dans les tissus biologiques. Il est possible d'exploiter les effets mécaniques et/ou thermiques en fonction des paramètres ultrasonores utilisés. Guidée par un système d'Imagerie de Résonance Magnétique, cette technologie se voit dotée d'une modalité de planification et le suivi en temps réel de la procédure. Les applications actuelles des ultrasons focalisés guidés par IRM sont sur des organes fixes, notamment le cerveau et l'os ou le fibrome utérin. Dans le cas du cœur, d'une part la présence de mouvements cardiaques et respiratoires constitue une difficulté importante, tant pour le traitement ultrasonore (balistique) que pour l'IRM de température (artéfacts sur les images). D'autre part, la cage thoracique joue le rôle de barrière pour la propagation des ultrasons. Dans ce travail de thèse, un ensemble de techniques nouvelles pour l'ablation et la stimulation cardiaque non invasive par ultrasons focalisés guidés par IRM a été développé. Une première étude montre la faisabilité technique de contrôler le rythme cardiaque par des impulsions ultrasonores brèves dirigées vers le myocarde. L'influence des paramètres des impulsions a été étudiée quantitativement sur cœur isolé battant puis in vivo sur un modèle préclinique. Pour cela, un dispositif original a été développé. Une seconde étude présente de nouvelles méthodes rapides d'IRM permettant de cartographier simultanément la température et le déplacement local induit par les ultrasons focalisés. La méthode est validée sur le foie sur un modèle préclinique, et démontre qu'il est possible de corréler la dose thermique obtenue par thermométrie IRM à un changement des propriétés mécaniques des tissus traités mesurés simultanément. Une troisième étude a consisté à développer une technique de mesure de position de la cible en 3D temps réel par quelques éléments de l'émetteur ultrasonore opérant en réception. Cette mesure permet de corriger dynamiquement la position du foyer ultrasonore pour maximiser le dépôt d'énergie au point ciblé, le tout monitoré par thermométrie IRM temps réel à une cadence de 10 images par seconde. Là encore, une validation préclinique est présentée. Ce travail de thèse propose donc des avancées importantes pour lever les verrous actuels de la technologie permettant d'envisager des traitements non invasifs des pathologies cardiaques par voie non invasive, le tout guidé par IRM en temps réel
High intensity focused ultrasound has the ability to deposit ultrasonic energy locally and non-invasively into biological tissues. It is possible to exploit the mechanical and/or thermal effects according to the ultrasonic parameters used. Guided by a Magnetic Resonance Imaging (MRI) scanner, this technology is equipped with a planning modality and real-time monitoring of the procedure. As of now, applications of MRI-guided focused ultrasound are on fixed organs, including brain and bone or uterine fibroid. For the heart, the presence of cardiac and respiratory movements constitutes an important difficulty, both for the ultrasonic (ballistic) treatment and for the temperature monitoring under MRI (artefacts on images). In addition, the rib cage acts as a barrier for the propagation of ultrasounds. In this thesis work, a set of new technological development have been developed for ablation and non-invasive cardiac stimulation using focused MRI-guided ultrasound. A first study shows the technical feasibility of controlling heart rhythm by short ultrasound pulses targeted to the myocardium. The influence of the parameters of the pulses (duration, amplitude, emission time in the cardiac cycle) were studied quantitatively on isolated beating heart then in vivo on a preclinical model. For this, an original device was developed. A second study presents new rapid MRI methods for simultaneously mapping the temperature and local displacement induced by focused ultrasound. The method is validated on the liver on a preclinical model and demonstrates that it is possible to correlate the thermal dose obtained by MR-thermometry with a change in the mechanical properties of the treated tissues measured simultaneously. A third study consisted in developing a technique for measuring the position of the target in 3D real-time using some elements of the ultrasonic transmitter as receivers. This measure allows to dynamically correct the position of the ultrasonic focus to maximize energy deposition at the targeted point. In addition, we monitored in real-time the procedure using MR-thermometry at a rate of 10 images per second. Here again a preclinical validation is presented. This thesis work proposes important advances to remove the current locks of the technology allowing to envision noninvasive treatments of cardiac pathologies, all guided by MRI in real-time
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Books on the topic "Magnetite Heat treatment"

1

Bernshteĭn, Mark Lʹvovich. Termicheskai͡a︡ obrabotka stalʹnykh izdeliĭ v magnitnom pole. Moskva: "Mashinostroenie", 1987.

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service), SpringerLink (Online, ed. Electromagnetic Processing of Materials: Materials Processing by Using Electric and Magnetic Functions. Dordrecht: Springer Netherlands, 2012.

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Forfar, Colin. Diagnosis and investigation in suspected heart disease. Edited by Patrick Davey and David Sprigings. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199568741.003.0087.

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The past 20 years have seen significant changes in both the demographics and natural history of many cardiovascular diseases. Important reductions in case-fatality rates (such as in acute coronary syndromes) have resulted from improved diagnostics and treatment options and better understanding of natural history. For others (such as infective endocarditis), improvements have been limited and disappointing. While advances in therapy and the scientific evidence underpinning treatments have been crucial, the importance of accurate diagnosis has remained a key element for progress. Many of the principles needed for diagnosis are constant: the pre-eminence of a focused, accurate history, complete physical examination, and timely and relevant investigation endures. It is essential to have a secure knowledge of the strengths and limitations of interpretation of a frequently bewildering array of tests. Progress in this field has been rapid; advances in ultrasound, scintigraphy, and cardiac magnetic resonance stand out at the interface between structure and function central to good patient care.
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Transient thermal processing techniques in electronic materials: Proceedings of a symposium sponsored by the Thin Films & Interfaces Committee of the Electronic, Magnetic, and Photonic Materials Division (EMPMD) of TMS held during the 1996 TMS Annual Meeting in Anaheim, California, February 4-8, 1996. Warrendale, Pa: Minerals, Metals and Materials Society, 1996.

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Shulman, Ryan, Adrian Wilson, and Delia Peppercorn. Magnetic resonance imaging of the knee. Oxford University Press, 2011. http://dx.doi.org/10.1093/med/9780199550647.003.008003.

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♦ ACL tear: abnormal fibres, tibial translation, PCL/patella tendon buckling, bone bruising♦ Meniscal tear: signal change to free edge♦ Bone bruising:• Reticular—not continuous subarticular bone• Geographic—extends to subarticular bone♦ Posterolateral corner:• Oblique slices through fibular head• Consists of lateral collateral ligament, popliteus, popliteofibular ligament, and arcuate complex.Magnetic resonance imaging (MRI) has revolutionized the investigation and treatment of the painful knee. It is non-invasive and avoids patient exposure to ionizing radiation. MRI has the advantage of establishing diagnoses in a painful knee without the morbidity of surgical intervention. It is now widely available and has moved from a simple diagnostic adjunct into a key planning tool. It offers improved management of theatre resources and it allows for more accurate planning of postoperative rehabilitation.The role of MRI in management of the injured knee is determined by its cost-effectiveness and its ability to augment the diagnostic accuracy of clinical examination. Accuracy of clinical examination by specialist orthopaedic surgeons is comparable to MRI when interpreted by specialist radiologists (Table 8.3.1). Increasingly, MRI has been shown to be cost neutral. Whilst costs are high, diagnostic information reduces the need for unnecessary surgery.
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Asai, Shigeo. Electromagnetic Processing of Materials: Materials Processing by Using Electric and Magnetic Functions. Springer, 2014.

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Asai, Shigeo. Electromagnetic Processing of Materials: Materials Processing by Using Electric and Magnetic Functions. Springer, 2012.

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Stoner, Marie. Hypnosis and Biofeedback as Prototypes of Mind–Body Medicine. Edited by Anthony J. Bazzan and Daniel A. Monti. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190690557.003.0011.

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Hypnotizability is a strong moderator for treatment outcome in patients with psychiatric disorders. Hypnosis is able to reduce distress and pain in short procedures and has been particularly useful in cancer procedures. Gut-directed hypnotherapy for irritable bowel syndrome has shown substantial results for structured short-term scripted treatment. Biofeedback for hypertension is successful when clinical practice guidelines identifying patient characteristics are followed. Heart rate variability biofeedback shows promise as a technique to directly target self-regulatory mechanisms. Innovative use of real-time functional magnetic resonance imaging neurofeedback is showing promise for altering neural patterns underlying diverse disorders such as clinical depression and chronic pain. Obsessive-compulsive disorder and eating disorders patients may be selectively responsive to hypnotic suggestion. This chapter reviews the basis of hypnosis and related approaches to the management of patients with psychiatric conditions.
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Mavi, Jagroop, Anne C. Boat, Senthilkumar Sadhasivam, and Catherine P. Seipel. Congenital Diaphragmatic Hernia Repair. Edited by Erin S. Williams, Olutoyin A. Olutoye, Catherine P. Seipel, and Titilopemi A. O. Aina. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780190678333.003.0050.

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Congenital diaphragmatic hernia is an embryologic defect in diaphragm formation that allows abdominal contents to enter into the fetal pleural cavity, resulting in ipsilateral lung compression, pulmonary hypoplasia, and abnormal pulmonary vasculature. Though diagnosis is frequently made on prenatal imaging, the diagnosis should be considered in any newborn with respiratory distress. Prenatal predictors of defect severity include evaluation of observed-to-expected lung volumes on fetal magnetic resonance imaging and lung-to-head ratio on fetal ultrasound. Treatment focuses on medical stabilization, including optimization of oxygenation and ventilation, followed by surgical repair. Anesthetic considerations for these patients include management of coexisting cardiac disease and ventilatory parameters, in addition to standard neonatal anesthetic considerations.
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Thuny, Franck, and Didier Raoult. Pathophysiology and causes of endocarditis. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0160.

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Endocarditis is defined as an inflammation of the endocardial surface of the heart. This may include heart valves, mural endocardium or the endocardium that covers implanted material, such as prosthetic valves, pacemaker/defibrillator leads and catheters. Infective and non-infective-related causes must be distinguished. In most cases, the inflammation is related to a bacterial or fungal infection with oral streptococci, group D streptococci, staphylococci and enterococci accounting for 85% of episodes. Infective endocarditis (IE) is a serious disease with an incidence ranging from 30 to 100 episodes/million patient-years. From various portals of entry (e.g. oral, digestive, cutaneous) and a subsequent bacteraemia, pathogens can adhere and colonize intracardiac foreign material or onto previously damaged endocardium due to numerous complex processes based on a unique host–pathogen interaction. Rarely, endocarditis can be related to non-infective causes, such as immunological or neoplastic. Mortality is high, with more than one-third dying within a year of diagnosis from complications such as acute heart failure or emboli. This disease still remains a diagnostic challenge with many cases being identified and subsequently treated too late. Diagnosis of IE usually relies on the association between an infectious syndrome and recent endocardial involvement. Blood cultures and echocardiography are the main diagnostic procedures, but are negative in almost 30% of cases, requiring the use of more sophisticated techniques. Computed tomography, magnetic resonance imaging and positron emission tomography are promising imaging modalities. Improved understanding of its pathophysiology and the development of relevant diagnostic strategies enables accelerated identification and treatment, and thus an improved prognosis.
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Book chapters on the topic "Magnetite Heat treatment"

1

Zhang, Y., C. He, X. Zhao, L. Zuo, J. He, C. Esling, G. Nishijima, T. Zhang, and K. Watanabe. "Rapid Full Annealing under High Magnetic Field." In Solid State Transformation and Heat Treatment, 103–9. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604839.ch13.

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Zhang, Xuexi, and Mingfang Qian. "Preparation and Heat Treatment of Magnetic Shape Memory Alloy Microwires." In Magnetic Shape Memory Alloys, 101–63. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6336-9_4.

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Kortman, Keith E., James T. Helsper, Wilson S. Wong, and William G. Bradley. "Magnetic resonance imaging of head and neck tumors." In Cancer Treatment and Research, 107–42. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-2029-6_8.

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Lufkin, Robert, and William Hanafee. "Magnetic Resonance Imaging of Head and Neck Cancer." In Cancer Treatment and Research, 3–30. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-1499-8_1.

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Spaeth, J. M. "Magnetic Resonance of Heat Treatment Centres in Silicon." In Early Stages of Oxygen Precipitation in Silicon, 83–101. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0355-5_5.

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Javed, Yasir, Khuram Ali, and Yasir Jamil. "Magnetic Nanoparticle-Based Hyperthermia for Cancer Treatment: Factors Affecting Heat Generation Efficiency." In Complex Magnetic Nanostructures, 393–424. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52087-2_11.

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Faugère, M. P., M. Crespin, P. Dion, F. Bergaya, A. Feylessoufi, and H. Van Damme. "Influence of Heat Treatment Kinetics on Calcium Silicate Hydrates Phase Evolution." In Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 217–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_16.

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LeBrun, Alexander, and Liang Zhu. "Magnetic Nanoparticle Hyperthermia in Cancer Treatment: History, Mechanism, Imaging-Assisted Protocol Design, and Challenges." In Theory and Applications of Heat Transfer in Humans, 631–67. Chichester, UK: John Wiley & Sons Ltd, 2018. http://dx.doi.org/10.1002/9781119127420.ch29.

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Zhong, X. C., H. Zhang, M. Zou, Z. W. Liu, D. C. Zeng, K. A. Gschneidner, and V. K. Pecharsky. "Influence of Heat Treatment on the Structure and Magnetic Properties of Gd5Sn4Alloy for Magnetic Refrigeration." In Supplemental Proceedings, 331–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062111.ch36.

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Held, P., P. Lukas, A. Atzinger, S. Braitinger, W. D. Gassel, F. Fellner, N. Obletter, G. Schenk, and K. Pfaendner. "Monitoring of Therapy in Head and Neck Tumors Using Magnetic Resonance Snap-Shot Imaging." In Tumor Response Monitoring and Treatment Planning, 89–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-48681-4_16.

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Conference papers on the topic "Magnetite Heat treatment"

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Su, Di, Ronghui Ma, and Liang Zhu. "Numerical Study of Nanofluid Transport in Tumors During Nanofluid Infusion for Magnetic Nanoparticle Hyperthermia Treatment." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75101.

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The application of nanostructures in hyperthermia treatment of cancer has attracted growing research interest due to the fact that magnetic nanoparticles are able to generate impressive levels of heat when excited by an external magnetic field [1–3]. Various types of nanoparticles such as magnetite and superparamagentic iron oxide nanoparticles have demonstrated great potentials in hyperthermia treatment; however many challenges need to be addressed for future applications of this method in clinical studies. One leading issue is the limited knowledge of nanoparticle distribution in tumors. Since the temperature elevation is induced as the result of the heat generation by the nanoparticles, the concentration distributions of the particles in a tumor play a critical role in determining the efficacy of the treatment. The lack of control of the nanoparticle distribution may lead to inadequacy in killing tumor cells and/or damage to the healthy tissue.
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Kobori, Hiromi, Kengou Ohnishi, Akira Sugimura, and Toshifumi Taniguchi. "Appearance of Variable-Range-Hopping Conduction and Enhanced Spin Dependent Transport by Low Temperature Heat Treatment for Magnetite Nanoparticle Sinter." In 2007 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2007. http://dx.doi.org/10.7567/ssdm.2007.p-12-3.

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Gutierrez, Gustavo, Juan Catan˜o, Carmen Melendez, Oscar Perales-Perez, M. S. Tomar, and Eric Calderon. "Characterization of Mn-Zn Magnetic Fluid for Cooling Applications at Ambient Temperature." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79599.

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There are presently many applications using nanofluids in thermal engineering. Some examples include the use of nanoparticles in conventional coolants to enhance heat transfer rate by increasing its thermal conductivity. Other applications include the sealing of bearing cases and sealing of rotary shafts. Even at low weight concentration, thermal conductivity increases significantly. In biotechnology, magnetic nanoparticles have been proposed for thermal treatment of tumor using nanoshells and alternating magnetic fields to generate heat in localized points. This paper evaluates the use of aqueous ferrofluid composed of MnxZn1−xFe2O4 nanoparticles for cooling applications in the ambient temperature range. The use of ferromagnetic fluid for cooling applications represents an encouraging alternative to traditional methods; the fact that the fluid can be pumped with no moving mechanical parts, using the magnetocaloric effect, can be a great advantage for many applications where maintenance or power consumption are undesirable. A magnetic fluid suitable for this specific application has to have certain specific properties, like low Curie temperature, high magnetization, low viscosity and high specific heat. The selection of this ferrofluid is made based on its low Curie temperature (Tc), high saturation magnetization (Ms), low viscosity and high specific heat. The selection of a Mn-Zn ferrite-based aqueous ferrofluid was made based on its low Curie temperature compared with more commercially common magnetite-based ones. The synthesis of the ferrite nanoparticles was carried out by chemical precipitation and the process is described further on. Magnetic characterization of MnxZn1−xFe2O4 nanoparticles included the determination of Ms as a function of composition at 300K and the dependence of Ms with temperature for a specific ‘x’ value. Both types of measurements were carried out by using SQUID (Superconducting Quantum Interference Device) magnetometer.
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Pyung Woo Jang, Taek Dong, Yuong Ho Kim, and Tak Kang. "Heat treatment effects of CoCr sputtered films." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734337.

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Mas'udah, Kusuma Wardhani, Pelangi Eka Yuwita, Yuanita Amalia Haryanto, Ahmad Taufiq, and Sunaryono. "Effect of heat treatment on carbon characteristic from corncob powders prepared by coprecipitation method." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015777.

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Clavaguera-Mora, M. T., M. D. Baro, S. Surinach, J. A. Diego, and N. Clavaguera. "Magnetization versus heat treatment in rapidly solidified NdFeB alloys." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734856.

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Kim, J., J. Hong, J. Lee, and S. Park. "Performance improvement of an automotive alternator by heat treatment." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156830.

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Kim, H., C. Park, J. Lee, and W. Jeung. "Variation of magnetic properties by heat treatment on CoFeNi alloys." In INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.374875.

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Pee-Yew Lee, Chung-Kwei Lin, Chieh-Lung Chang, Yeukuang Hwu, and Tsung-Shune Chin. "Preparation of iron nitride powders through mechanical alloying and atmospheric heat treatment." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837462.

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Attaluri, Anilchandra, Ronghui Ma, and Liang Zhu. "Quantification of Nanoparticle Distribution in Tissue After Direct Injection Using MicroCT Imaging." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22139.

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Magnetic nanoparticles have been used in clinical and animal studies to generate localized heating for tumor treatments when the particles are subjected to an external alternating magnetic field. One approach to deliver the nanoparticles is via directly injecting the nanoparticles in the extracellular space of the tumor. Its advantage is that multiple-site injections can be exploited to cover the entire target region in the case of an irregularly shaped tumor. Currently since most tissue is opaque, the detailed information of the nanoparticle spreading after the injection can not be visualized directly and it is often quantified by indirect methods such as temperature measurements to inversely determine the distribution. In this study, we use a high-resolution microCT imaging system to investigate the nanoparticle concentration distribution in a tissue equivalent agarose gel. The preliminary results are promising to obtain a 3-D distribution of the ferrofluid in tissue. The local density variations induced by the nanoparticles in the vicinity of the injection site can be detected and analyzed by the microCT system. Experiments are performed to study how the injection amount, gel concentration, and nanoparticle concentration in the ferrofluid affect nanoparticle spreading in the gel. The obtained quantified information is important for future studies of temperature elevations in opaque tumor to design optimized treatment protocols.
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Reports on the topic "Magnetite Heat treatment"

1

Ludtka, Gerard Michael. Heat Treatment of Iron-Carbon Alloys in a Magnetic Field (Phase 2). Office of Scientific and Technical Information (OSTI), November 2017. http://dx.doi.org/10.2172/1410924.

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