Relevant bibliographies by topics / Maghemite Heat treatment

Academic literature on the topic 'Maghemite Heat treatment'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Maghemite Heat treatment"

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Ramesh, Sivarajan, Israel Felner, Yuri Koltypin, and Aharon Gedanken. "Reaction Pathways at the Iron–microspherical Silica Interface: Mechanistic Aspects of the Formation of Target Iron Oxide Phases." Journal of Materials Research 15, no. 4 (April 2000): 944–50. http://dx.doi.org/10.1557/jmr.2000.0135.

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Oxidative hydrolysis of elemental iron nanoclusters on hydroxylated surfaces such as silica or alumina is known to be influenced by the degree of hydration of the surface. The understanding and control of this process is crucial in the synthesis of iron oxide coated silica microspheres with a desired magnetic property. The hydrolysis of iron nanoparticles followed by heat treatment in the case of a hydrated microspherical silica surface results in the formation of maghemite (γ–Fe2O3), whereas a dehydrated surface yielded hematite (α–Fe2O3) nanoparticles. The influence of adsorbed water on the formation of intermediate iron oxides/oxidehydroxides and the mechanistic aspects of their subsequent thermal dehydration iron oxide phases were investigated by thermogravimetric analysis, Fourier transform infrared, and Mössbauer spectroscopies. The reactions on both the hydrated and the dehydrated surfaces were found to proceed through the formation of an x-ray amorphous lepidocrocite [γ–FeO(OH)] intermediate and its subsequent dehydration to maghemite (γ–Fe2O3). Maghemite to hematite transformation was readily facilitated only on a dry silica surface. The retardation of the lepidocrocite →maghemite →hematite transformation in the case of a hydrated silica surface is suggested to arise from strong hydrogen-bonded interactions between the substrate silica and the adsorbed nanoparticles.
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Karakuscu, Aylin, and Macit Ozenbas. "Characterization of Iron Oxide Thin Films Prepared by Sol–Gel Processing." Journal of Nanoscience and Nanotechnology 8, no. 2 (February 1, 2008): 901–6. http://dx.doi.org/10.1166/jnn.2008.d027.

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Iron oxide thin films were prepared by spin-coating a gel solution of iron(III) nitrate dissolved in 2-methoxyethanol and acetylacetone on glass and quartz substrates. The film thickness was adjusted by changing the spinning rate of the spin coater. Annealing was carried out between 300 °C to 600 °C to investigate the phases present in the films. Viscosity of the main solution was found as 0.0035 Pa·s by viscosity measurement. TGA/DTA analyses showed that heat treatment should be done between 330 &degC and 440 °C in order to produce maghemite thin films. SEM studies showed that single layer thickness of the films were between 65 and 80 nm. The structural characteristics were evaluated by changing the experimental parameters which are annealing temperature, annealing time and thickness of the films. From the X-ray diffraction analysis, maghemite formation was observed with decreasing annealing temperature, annealing time and film thickness. TEM results verified the presence of the maghemite phase by electron diffraction and selected area electron diffraction (SAED) methods. According to UV-Vis results transmittance of the films decreases with increasing annealing temperature.
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Fernández-Álvarez, Fátima, Gracia García-García, and José L. Arias. "A Tri-Stimuli Responsive (Maghemite/PLGA)/Chitosan Nanostructure with Promising Applications in Lung Cancer." Pharmaceutics 13, no. 8 (August 10, 2021): 1232. http://dx.doi.org/10.3390/pharmaceutics13081232.

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A (core/shell)/shell nanostructure (production performance ≈ 50%, mean diameter ≈ 330 nm) was built using maghemite, PLGA, and chitosan. An extensive characterization proved the complete inclusion of the maghemite nuclei into the PLGA matrix (by nanoprecipitation solvent evaporation) and the disposition of the chitosan shell onto the nanocomposite (by coacervation). Short-term stability and the adequate magnetism of the nanocomposites were demonstrated by size and electrokinetic determinations, and by defining the first magnetization curve and the responsiveness of the colloid to a permanent magnet, respectively. Safety of the nanoparticles was postulated when considering the results from blood compatibility studies, and toxicity assays against human colonic CCD-18 fibroblasts and colon carcinoma T-84 cells. Cisplatin incorporation to the PLGA matrix generated appropriate loading values (≈15%), and a dual pH- and heat (hyperthermia)-responsive drug release behaviour (≈4.7-fold faster release at pH 5.0 and 45 °C compared to pH 7.4 and 37 °C). The half maximal inhibitory concentration of the cisplatin-loaded nanoparticles against human lung adenocarcinoma A-549 cells was ≈1.6-fold less than that of the free chemotherapeutic. Such a biocompatible and tri-stimuli responsive (maghemite/PLGA)/chitosan nanostructure may found a promising use for the effective treatment of lung cancer.
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Kozlovskiy, Artem, Jumat Kargin, Malik Kokarev, and Daut Mukhambetov. "Study of the iron nanoparticles phase transformation during thermal annealing." Chemical Bulletin of Kazakh National University, no. 1 (March 31, 2017): 16–25. http://dx.doi.org/10.15328/cb796.

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Change in structural properties and phase composition of nanoparticles based on iron oxide was researched in the paper. As a result of conducted studies it was found that during heat treatment oxide phases of (γ-Fe2O3) and α-Fe2O3 maghemite were formed in oxygen atmosphere. Researches of powder array magnetization were showed that the hysteresis loop movement had the form characteristic for ferromagnetic materials. Additionally, loops obtained at different directions of the magnetic field have different characters, which indicate the magnetic anisotropy presence in the samples.
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Theerdhala, Sriharsha, Devendra Alhat, Satish Vitta, and D. Bahadur. "Synthesis of Shape Controlled Ferrite Nanoparticles by Sonochemical Technique." Journal of Nanoscience and Nanotechnology 8, no. 8 (August 1, 2008): 4268–72. http://dx.doi.org/10.1166/jnn.2008.an21.

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Synthesis of magnetic iron oxides/ferrites in the nano scale by sonochemical synthesis has become prominent recently. This technique facilitates the synthesis of magnetic particles in the nano scale attributed to the hotspot mechanism arising due to acoustic cavitation induced chemical reaction. Generally volatile organometallic precursor compounds favoring the formation of fully amorphous particles have been used to synthesize various nano magnetic materials. We report here the synthesis of ultrafine, <10 nm magnetic iron oxide nanoparticles by sonochemical technique starting with a non-volatile precursor iron salt such as iron citrate which seems to favor the formation of semi crystalline/crystalline particles as the reaction takes place either in the interfacial region or in the bulk solution. Mono dispersed, ultra fine, ∼4 nm spherical shaped magnetic maghemite particles having a saturation magnetization of 58.2 emu/g and coercivity of 118 Oe were obtained at low values of pH, 10 while higher pH, 11–13 favored the formation of elongated, cylindrical, acicular particles with a reduced magnetization. The coercivity was also found to decrease with increasing pH, with it being 118 Oe at pH 10 and 3 Oe at pH 13. When the ultrasound amplitude/intensity was low, 38% heat treatment of the samples at 300 °C (at pH 10) was required to make them crystalline, while application of high intensity ultrasound, 50% amplitude served as a single step mechanism for obtaining crystalline maghemite particles. The maghemite particles obtained at a pH of 10 could find applications in information storage media.
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Azadmanjiri, Jalal, George P. Simon, Kiyonori Suzuki, Cordelia Selomulya, and John D. Cashion. "Phase reduction of coated maghemite (γ-Fe2O3) nanoparticles under microwave-induced plasma heating for rapid heat treatment." J. Mater. Chem. 22, no. 2 (2012): 617–25. http://dx.doi.org/10.1039/c1jm12524a.

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Kawashita, Masakazu, Shinjiro Domi, Yasuhiro Saito, Masaaki Aoki, Yukihiro Ebisawa, Tadashi Kokubo, Takashi Saito, Mikio Takano, Norio Araki, and Masahiro Hiraoka. "In vitro heat generation by ferrimagnetic maghemite microspheres for hyperthermic treatment of cancer under an alternating magnetic field." Journal of Materials Science: Materials in Medicine 19, no. 5 (October 4, 2007): 1897–903. http://dx.doi.org/10.1007/s10856-007-3262-8.

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Bennett, Brionna L., Elijah C. Wyatt, and Clifton T. Harris. "Fabrication of Thickness-Controlled Hematite Thin Films via Electrophoretic Deposition and Subsequent Heat Treatment of Pyridine-Capped Maghemite Nanoparticles." Industrial & Engineering Chemistry Research 55, no. 44 (October 27, 2016): 11583–88. http://dx.doi.org/10.1021/acs.iecr.6b02394.

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Lee, Kian Mun, and Abdul Halim Abdullah. "Synthesis and characterization of zinc oxide/maghemite nanocomposites: Influence of heat treatment on photocatalytic degradation of 2,4-dichlorophenoxyacetic acid." Materials Science in Semiconductor Processing 30 (February 2015): 298–306. http://dx.doi.org/10.1016/j.mssp.2014.10.017.

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Mou, Fangzhi, Jian-guo Guan, Weidong Shi, Zhigang Sun, and Shuanhu Wang. "Oriented Contraction: A Facile Nonequilibrium Heat-Treatment Approach for Fabrication of Maghemite Fiber-in-Tube and Tube-in-Tube Nanostructures." Langmuir 26, no. 19 (October 5, 2010): 15580–85. http://dx.doi.org/10.1021/la102830p.

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Conference papers on the topic "Maghemite Heat treatment"

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Altayeb, Yousra Bashir Fathalrhman, and Ecir Yılmaz. "Oral Squamous Cell Carcinoma (OSCC) Treatment by Magneti Nanoparticles (Hyperthermia Method): A Review." In 6th International Students Science Congress. Izmir International Guest Student Association, 2022. http://dx.doi.org/10.52460/issc.2022.020.

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Squamous cell carcinoma (SCC) is the most commonly diagnosed oral cancer. It is a type of head and neck squamous cell carcinoma (HNSCC) oral cancer affects more than 300,000 people in a year. Oral cancer is the sixth most common malignant cancer. The traditional methods of treatment were used through surgery, followed by chemotherapy, but these methods are not effective enough for the treatment, so treatment was focused on using magnetic nanoparticles. Magnetic nanoparticles demolish only the cancer cells directly without affecting healthy cells. They can also be used to increase the effectiveness of the other treatment methods. Iron oxide nanoparticles, maghemite (Fe2O3) and magnetite (Fe3O4) are widely used in the diagnosis and treatment of cancerous diseases. Iron oxides NPs have distinctive properties as they have good biodegradability, very low toxicity, modifiability, and ease of preparation. the method of hyperthermia is one of the effective methods in the treatment of cancer. Because cancer cells show greater sensitivity to high temperature compared to normal cells.
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Sandri, Monica, Michele Iafisco, Silvia Panseri, Elisa Savini, and Anna Tampieri. "Fully Biodegradable Magnetic Micro-Nanoparticles: A New Platform for Tissue Regeneration and Theranostic." In ASME 2013 2nd Global Congress on NanoEngineering for Medicine and Biology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/nemb2013-93223.

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Nowadays, magnetic materials are receiving special attention due to their potential applications in different fields and in particular in medicine. Magnetic micro-nano-particles have been progressively employed as support materials for enzyme immobilization, and have been used as drug-delivery vehicles, contrast agents for magnetic resonance imaging as well as heat mediators for hyperthermia-based anti-cancer treatments and many other exciting biomedical applications. Magnetic materials have also attracted a big interest in the field of bone tissue regeneration because it has been demonstrated that magnetic nanoparticles have effect of osteoinduction even without external magnetic force. Therefore, one of the most big challenge in this field is the production of magnetic materials with good biocompatibility and biodegradability. In fact, the long-term effects in the human body of iron oxide (maghemite or magnetite), the most popular magnetic phase used in medicine and biotechnology, are not yet completely assessed. To this aim, in this work we developed an innovative biocompatible and bioresorbable superparamagnetic-like phase by doping nano-hydroxyapatite with Fe2+/Fe3+ ions (FeHA). Moreover the same magnetic nanoparticles were used as nano-particulate emulsifier for the preparation of hollow hybrid Fe-HA-poly(L-lactic) acid (PLLA) micro-nano-spheres. PLLA has been used because poly(α-hydroxy-esters) are the most frequently used synthetic polymers for biomedical applications owing to their biocompatibility, hydrolytic degradation process and proper mechanical properties. These micro-nanospheres could be used as new type of scaffold for hard tissue regeneration. In fact, spherical scaffold display several advantages respect to the monolithic counterpart e.g., (i) improving control over sustained delivery of therapeutic agents, signalling biomolecules and even pluripotent stem cells, (ii) serving as stimulus-sensitive delivery vehicles for triggered release, (iii) introducing porosity and/or improve the mechanical properties of bulk scaffolds by acting as porogen or reinforcement phase, (iv) supplying compartmentalized micro-reactors for dedicated biochemical processes, (v) functioning as cell delivery vehicle, and, finally, (vi) giving possibility of preparing injectable and/or mouldable formulations to be applied by using minimally invasive surgery. Moreover, the same magnetic materials could find applications in nanomedicine as a multifunctional carrier. Their magnetic functionality could be utilized to move them into the body towards target organs by an external magnetic field. Furthermore, the superparamagnetic feature of the nanoparticles could allow to tailor the release of the therapeutic agent by switching (on-off) the external magnetic field and/or to treat cancer cells by hyperthermia.
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