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Academic literature on the topic 'Titanian magnetite'

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Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Titanian magnetite"

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Nishio, Ikuya, Tomoaki Morishita, Kristofer Szilas, Graham Pearson, Ken-Ichiro Tani, Akihiro Tamura, Yumiko Harigane, and Juan Guotana. "Titanian Clinohumite-Bearing Peridotite from the Ulamertoq Ultramafic Body in the 3.0 Ga Akia Terrane of Southern West Greenland." Geosciences 9, no. 4 (April 1, 2019): 153. http://dx.doi.org/10.3390/geosciences9040153.

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A titanian clinohumite-bearing dunite was recently found in the Ulamertoq ultramafic body within the 3.0 Ga Akia Terrane of southern West Greenland. Titanian clinohumite occurs as disseminated and discrete grains. Titanian clinohumite contains relatively high amounts of fluorine, reaching up to 2.4 wt.%. The high-Fo content of olivine (Fo93) coupled with low Cr/(Cr + Al) ratio of orthopyroxene implies that the dunite host is not of residual origin after melt extraction by partial melting of the primitive mantle. Olivine grains are classified into two types based on abundances of opaque mineral inclusions: (1) dusty inclusion-rich and (2) clear inclusion-free olivines. Opaque inclusions in coarse-grained olivines are mainly magnetite. Small amounts of ilmenite are also present around titanian clinohumite grains. The observed mineral association indicates partial replacement of titanian clinohumite to ilmenite (+magnetite) and olivine following the reaction: titanian clinohumite = ilmenite + olivine + hydrous fluid. The coexistence of F-bearing titanian clinohumite, olivine, and chromian chlorite indicates equilibration at around 800–900 °C under garnet-free conditions (<2 GPa). Petrological and mineralogical characteristics of the studied titanian clinohumite-bearing dunite are comparable to deserpentinized peridotites derived from former serpentinites. This study demonstrates the importance of considering the effects of hydration/dehydration processes for the origin of ultramafic bodies found in polymetamorphic Archaean terranes.
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Xie, L., R. C. Wang, D. Z. Wang, and J. S. Qiu. "A survey of accessory mineral assemblages in peralkaline and more aluminous A-type granites of the southeast coastal area of China." Mineralogical Magazine 70, no. 6 (December 2006): 709–29. http://dx.doi.org/10.1180/0026461067060362.

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AbstractAn extensive belt of A-type granite exists along the southeast coast of China. The granites are divided into peralkaline and more aluminous subgroups which differ in mineral assemblages, mineral compositions and textures. In the peralkaline subgroup, primary magmatic Th-rich zircon is typically overgrown by Th-poor zircon containing thorite micro-inclusions. REE minerals in this subgroup are dominated by allanite-(Ce), chevkinite-(Ce), titanite and pyrochlore. Fe-Ti oxides are titanian magnetite and Mn-rich ilmenite. In contrast, in the more aluminous subgroup rocks, zircon is weakly zoned and exhibits very low Th but relatively high U contents. The REE minerals are dominated by Th-rich monazite-(Ce). Titanium-poor magnetite, pyrophanite and rutile are the major Fe-Ti oxides. These occurrences indicate that peralkaline magmas favour the formation of REE silicates, whereas magmas with higher alumina saturation stabilize REE phosphates. Peralkaline granites crystallized at temperatures 50–100°C greater than the more aluminous granites, but under lower oxidation conditions. These differences in formation conditions of the two A-type granite subgroups, deduced by accessory mineralcharacteristics, are inferred to be related to magma derivation at different crustal levels, with peralkaline magma deriving from a deeper crustal level with more mantle input.
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Mitchell, R. H., and Fareeduddin. "Mineralogy of peralkaline lamproites from the Raniganj Coalfield, India." Mineralogical Magazine 73, no. 3 (June 2009): 457–77. http://dx.doi.org/10.1180/minmag.2009.073.3.457.

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AbstractTwo mineralogically distinct lamproites occurring as dykes in the Raniganj coalfield of eastern India are described in terms of a mineralogical-genetic classification as: (1) peralkaline olivine-ilmenitephlogopite- K-feldspar lamproite (var. Damodar); and (2) peralkaline pseudoleucite-phlogopite-amphibole- K-feldspar lamproite (var. Damodar). Compositional and paragenetic data are provided for major, accessory and trace minerals. Minerals common to both rocks include: chlorite-pseudomorphed phenocrystal olivine, phenocrystal Ti-rich Al-poor phlogopite and tetraferriphlogopite, groundmass potassic amphiboles, Sr-rich apatite and monazite-(Ce), late stage Na-poor K-feldspar and quartz. The rocks differ in terms of the character of the amphiboles (Ti-potassian arfvedsonite vs. K-richterite– K-magnesioarfvedsonite–K-arfvedsonite solid solution), spinel compositions (qandilite–chromite– magnetite vs. chromite–ulvöspinel–magnetite), the presence or absence of: pseudoleucite, microphenocrystal magnesian ilmenite, diopside, titanian aegirine, lorenzenite, an unamed Ti-silicate, an unnamed Mg-Zr silicate, bazirite, rutile, dolomite and norsethite. The rocks are considered to be members of a spectrum of modally-diverse peralkaline rocks, formed from a common parental magma produced by the partial melting of the ancient metasomatized lithospheric mantle of the northern Singhbhum craton. None of the rocks can be considered as aillikites, minettes, orangeites or kimberlites.
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Mitchell, R. H., and F. A. Belton. "Cuspidine-sodalite natrocarbonatite from Oldoinyo Lengai, Tanzania: a novel hybrid carbonatite formed by assimilation of ijolite." Mineralogical Magazine 72, no. 6 (December 2008): 1261–77. http://dx.doi.org/10.1180/minmag.2008.072.6.1261.

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AbstractA unique hybrid natrocarbonatite, collected from the new ash cone of the volcano Oldoinyo Lengai. Tanzania in July 2008, consists of phenocrysts of nyerereite and gregoryite together with xenocrysts of clinopyroxene, nepheline and Ti-andradite set in a groundmass of cuspidine, sodalite, ferroan manganoan monticellite, K-Fe sulphide and manganoan titanian magnetite and gregoryite. The xenocrysts were not in equilibrium with the melt which formed their current host, as clinopyroxenes and Ti-andradite are mantled by cuspidine, and nepheline by sodalite and phlogopite—potassian kinoshitalite solid solutions. A microxenolith of ijolite exhibits similar reaction phenomena. The minerals of the xenocryst suite have similar compositions to plutonic ijolites found at Oldoinyo Lengai, and are thus considered to be derived by the fragmentation of such material in a previously contaminated natrocarbonatite melt. The latter, which has cuspidine, sodalite and monticellite as primary liquidus phases, is considered to have been formed by the complete assimilation of ijolitic material in a natrocarbonatite magma at depth in the volcano conduit. The occurrence of trace amounts of cuspidine, Fe-Mn-monticellite, K-Fe sulphide and Mn-Ti-spinel in recently erupted natrocarbonatites is ascribed to similar, but less extensive, assimilation of silicate material prior to their eruption.
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Mitchell, Roger H., R. Garth Platt, Maureen Downey, and David G. Laderoute. "Petrology of alkaline lamprophyres from the Coldwell alkaline complex, northwestern Ontario." Canadian Journal of Earth Sciences 28, no. 10 (October 1, 1991): 1653–63. http://dx.doi.org/10.1139/e91-147.

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A suite of alkaline lamprophyre dikes emplaced in centers I and II rocks of the Coldwell alkaline complex is composed of camptonites with calcite ocelli, camptonites with quartz macrocrysts, amphibole camptonites, monchiquites, and sannaites. The camptonites are characterized by phenocrysts of olivine, aluminian pyroxene, kaersutite, and titanian ferropargasite set in a matrix of magnesian hastingsite, augite, plagioclase, biotite, magnetite, sphene, and minor nepheline. Quartz macrocrysts occur as corroded euhedral single crystals. Monchiquites are petrographically similar to the camptonites but are characterized by the presence of an isotropic groundmass. Sannaites contain aluminian and chromian diopside phenocrysts set in a matrix of ferroan pargasite, aluminian diopside, biotite, albitized plagioclase, and epidotized alkali feldspar.Major-element compositions indicate the ocellar camptonites, amphibole camptonites, and monchiquites have affinities with alkali olivine basalt and that monchiquites and camptonites are heteromorphs. None of the dikes represent primitive liquids. Poor correlations between incompatible trace elements (Sr, Ba, Nb, Zr, rare earths), together with the presence of reversely zoned and corroded phenocrysts, suggest that none of the lamprophyres represent single batches of magma. The lamprophyres are considered to be hybrid magmas, formed by the mixing of fragmented cumulates, several generations of phenocrysts, and batches of magma extracted from a continuously replenished evolving magma chamber located within the infrastructure of the complex. Quartz-bearing camptonites are considered to form by contamination of camptonites, although the source of the quartz cannot be determined.
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Geldenhuys, I. J., Q. G. Reynolds, and G. Akdogan. "Evaluation of Titania-Rich Slag Produced from Titaniferous Magnetite Under Fluxless Smelting Conditions." JOM 72, no. 10 (August 3, 2020): 3462–71. http://dx.doi.org/10.1007/s11837-020-04304-3.

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Abstract Titanium-bearing magnetite ore is generically defined as magnetite with > 1% titanium dioxide (TiO2) and is usually vanadium-bearing. The iron and titanium occur as a mixture of magnetite (Fe3O4) and ilmenite (FeTiO3) with vanadium oxide usually occurring within the solid solution of the titanium-bearing magnetite phase. These ores are currently widely processed in blast furnaces via modified ironmaking processes. Typically, vanadium is recovered as a by-product from the ironmaking process, while the diluted titania slag is stockpiled. Fluxless smelting in a direct-current open-arc furnace is proposed as an opportunity to improve iron and vanadium recovery and potentially unlock the titanium as a slag product. Slags produced from a pilot study are compared to industrial slags produced from ilmenite. The findings from the pilot test show that slag produced under fluxless smelting conditions in an open-arc electric furnace is remarkably similar to industrial ilmenite slags. The test conditions were varied to evaluate the slag and metal composition, and furnace operation, under increasing reducing conditions. The study showed that the slag and metal product was remarkably similar to industrial slag produced from ilmenite.
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Song, Hanlin, Jinpeng Zhang, and Xiangxin Xue. "Kinetics on Chromium-Bearing Vanadia-Titania Magnetite Smelting with High-Basicity Pellet." Processes 9, no. 5 (May 6, 2021): 811. http://dx.doi.org/10.3390/pr9050811.

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The effects of high-basicity pellet on smelting chromium-bearing vanadia-titania magnetite are investigated via thermodynamic smelting and non-isothermal kinetics experiments. The thermodynamic results indicated that the high-basicity pellet significantly affects and ameliorates the softening-melting-dripping behaviors during the smelting process. As the high-basicity pellet ratio increased from 0 wt.% to 52 wt.%, the range of softening temperature [T40–T4] decreased from 121 °C to 84 °C and the melting-dripping temperature [Td–Ts] decreased from 224 °C to 169 °C. Moreover, the apparent activation energy of non-isothermal kinetics also decreased from 99.91 kJ·mol−1 to 66.74 kJ·mol−1. Additionally, the reaction mechanism of high-basicity pellet on smelting chromium-bearing vanadia-titania magnetite was investigated via thermodynamic calculations of Gibbs free energy and characterizations of the titanium slag. Therefore, combined with the lowest permeability index, the fastest non-isothermal reduction rate, the highest recovery of valuable elements and the minimum content of titanium carbonitride, the preferable high-basicity pellet ratio was considered to be 11~23 wt.%.
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Gerasimova, Lidia G., Anatoly I. Nikolaev, Ekaterina S. Shchukina, and Marina V. Maslova. "Titanite-Containing Mineral Compositions and Their Chemical Treatment with Preparation of Functional Materials." Materials 13, no. 7 (April 1, 2020): 1599. http://dx.doi.org/10.3390/ma13071599.

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The waste of apatite-nepheline ore processing was chosen as the material of study for the present investigation. The chemical and phase compositions have been analyzed and the route of the new technology has been developed. Treatment of the waste with diluted hydrochloric acid enables to separate apatite, nepheline, titano-magnetite minerals from titanite (CaSiTiO5). The obtained titanite concentrate contains 30–32% of titanium dioxide. Interaction of titanite with hydrochloric acid under heating and stirring conditions results in calcium leaching. The titanite decomposition is accompanied by titanium and silica oxides precipitation. The resulting solid has been used as a precursor for the synthesis of functional materials. Mechanochemical activation of the precursor provides the structural and morphological disorder of the initial particles. Thermodynamic stability of activated particles is achieved by chemisorption or roasting.
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Kazakov, D. A., V. V. Vol’khin, K. Kaczmarski, Yu O. Gulenova, M. N. Obirina, and D. A. Rozhina. "Catalytic Ozonation of 4-Nitrophenol in the Presence of Magnetically Separable Titanium Dioxide – Magnetite Composite." Eurasian Chemico-Technological Journal 17, no. 4 (April 2, 2016): 309. http://dx.doi.org/10.18321/ectj275.

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<p>This paper deals with determining catalytic activities of titania (TiO<sub>2</sub>) with various crystalline structures and magnetite (Fe<sub>3</sub>O<sub>4</sub>) during mineralization of 4-nitrophenol in aqueous media by ozonation. Among the titania samples under study, amorphized TiO<sub>2</sub> was shown to have the highest catalytic activity, while magnetite was characterized by the lowest catalytic activity. A procedure is proposed to synthesize a magnetically separable composite (TiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>) including amorphized titania and magnetite phases, which involves deposition of a catalytically active titania phase on preformed magnetite particles. We also studied the effect of mass ratio of titania and magnetite phases in the composite on its catalytic activity during 4-nitrophenol mineralization by ozonation. It was found that catalytic activity of composite increased as the amorphized titania phase was doped with magnetite phase up to 30% wt but as the magnetite portion in the composite catalyst was further increased, its activity decreased. According to Fourier transform infrared (FTIR) spectroscopy, content of catalytically active sites (hydroxyl groups of titania) in the composite catalyst decreases as compared to the pure phase of amorphized titania. Increase in catalytic activity of the composite as its magnetite content increases to 30% wt can be attributed to increase of accessibility of catalytically active sites (OH groups) for ozone, because specific surface area and total pore volume of the composite catalyst as determined by BET increase as compared to amorphized TiO<sub>2</sub> and catalytically active titania phase is located mostly on surface of magnetite particles which is indicated by scanning electron microscopy (SEM) results and electrophoretic light scattering (ELS) data. It was shown that the obtained composite catalyst of optimized composition, in spite of its fine particles, can be easily recovered from aqueous phase by magnetic field and used repeatedly in ozonation in order to promote water purification process.</p>
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Wojciechowska, Agnieszka, and Zofia Lendzion-Bieluń. "Synthesis and Characterization of Magnetic Nanomaterials with Adsorptive Properties of Arsenic Ions." Molecules 25, no. 18 (September 9, 2020): 4117. http://dx.doi.org/10.3390/molecules25184117.

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A new synthesis method of hybrid Fe3O4/C/TiO2 structures was developed using microwave-assisted coprecipitation. The aim of the study was to examine the effect of the addition of glucose and titanium dioxide on adsorptive properties enabling removal of arsenic ions from the solution. The study involved the synthesis of pure magnetite, magnetite modified with glucose and magnetite modified with glucose and titanium dioxide in magnetite: glucose: titanium dioxide molar ratio 1:0.2:3. Materials were characterized by XRD, FT-IR, and BET methods. Magnetite and titanium dioxide nanoparticles were below 20 nm in size in obtained structures. The specific surface area of pure magnetite was approximately 79 m2/g while that of magnetite modified with titanium dioxide was above 190 m2/g. Obtained materials were examined as adsorbents used for removal As(V) ions from aqueous solutions. Adsorption of arsenic ions by pure magnetite and magnetite modified with titanium dioxide was very high, above 90% (initial concentration 10 mg/L), pH in the range from 2 to 7. The preparation of magnetic adsorbents with a high adsorption capacity of As(V) ions was developed (in the range from 19.34 to 11.83 mg/g). Magnetic properties enable the easy separation of an adsorbent from a solution, following adsorption.
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Dissertations / Theses on the topic "Titanian magnetite"

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Longbottom, Raymond James Materials Science &amp Engineering Faculty of Science UNSW. "The formation of cementite from hematite and titanomagnetite iron ore and its stability." Awarded by:University of New South Wales. Materials Science and Engineering, 2005. http://handle.unsw.edu.au/1959.4/22023.

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This project examined the reduction and formation of cementite from hematite and titanomagnetite ores and cementite stability. The aim of the project was to develop further understanding of cementite stability under conditions relevant to direct ironmaking and the mechanism of cementite decomposition. The reduction of hematite and ironsand by hydrogen-methane-argon gas mixtures was investigated from 600??C to 1100??C. Iron oxides were reduced by hydrogen to metallic iron, which was carburised by methane to form cementite. The hematite ore was reduced more quickly than the ironsand. Preoxidation of the ironsand accelerated its reduction. Hematite was converted to cementite faster than preoxidised ironsand. The decomposition of cementite formed from hematite was investigated from 500??C to 900??C. This cementite was most stable at temperatures 750-770??C. The decomposition rate increased with decreasing temperature between 750??C and 600??C and with increasing temperature above 770??C. The stability of cementite formed from pre-oxidised titanomagnetite was studied from 300??C to 1100??C. This cementite was most stable in the temperature range 700-900??C. The rate of decomposition of cementite increased with decreasing temperature between 700??C and 400??C and with increasing temperature above 900??C. Cementite formed from ironsand was more stable than cementite formed from hematite
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Beydoun, Donia Chemical Engineering &amp Industrial Chemistry UNSW. "Development of a novel magnetic photocatalyst : preparation, characterisation and implication for organic degradation in aqueous systems." Awarded by:University of New South Wales. Chemical Engineering and Industrial Chemistry, 2000. http://handle.unsw.edu.au/1959.4/20451.

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Magnetic photocatalysts were synthesised by coating a magnetic core with a layer of photoactive titanium dioxide. This magnetic photocatalyst is for use in slurry-type reactors in which the catalyst can be easily recovered by the application of an external magnetic field. The first attempt at producing this magnetic photocatalyst involved the direct deposition of titanium dioxide onto the surface of magnetic iron oxide particles. The photoactivity of these Fe3O4/TiO2 was lower than that of single-phase TiO2 and was found to decrease with an increase in the heat treatment. These observations were explained in terms of an unfavourable heterojunction between the titanium dioxide and the iron oxide core. Fe ion diffusion from the iron oxide core into the titanium dioxide matrix upon heat treatment, leading to a highly doped TiO2 lattice, was also contributing to the observed low activities of these samples. These Fe3O4/TiO2 particles were found to be unstable, with photodissolution of the iron oxide phase being encountered. This photodissolution was dependent on the heat treatment applied, the greater the extent of the heat treatment, the lower the incidence of photodissolution. This was explained in terms of the stability of the iron oxide phases present, as well as the lower photoactivity of the titanium dioxide matrix. In fact, the observed photodissolution was found to be induced-photodissolution. That is, the photogenerated electrons in the titanium dioxide phase were being injected into the lower lying conduction band of the iron oxide core, leading to its reduction and then dissolution. Thus, the approach of directly depositing TiO2 onto the surface of a magnetic iron oxide core proved ineffective in producing a stable magnetic photocatalyst. The introduction of an intermediate passive SiO2 layer between the titanium dioxide phase and the iron oxide phase inhibited the direct electrical contact and hence prevented the photodissolution of the iron oxide phase. Improvements in the photoactivity were seen to be due to the inhibition of both the electronic and chemical interactions between the iron oxide and titanium dioxide phases. Preliminary optimisation experiments revealed that a thin SiO2 layer is sufficient for inhibiting the photodissolution. The thickness of the TiO2 coating was found not to have a significant effect on the photocatalytic performance of the coated particles. Finally, heat treating for 20 minutes at 450??C was sufficient for converting the titanium dioxide into a photoactive phase, longer heating times had no beneficial effect on the photoactivity.
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Cavanough, Gary. "Measurement of magnetic susceptibility in titanium minerals processing /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17774.pdf.

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Vono, Lucas Lucchiari Ribeiro. "Design of nanocatalysts supported on magnetic nanocomposites containing silica, ceria and titania." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-17082016-082602/.

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Magnetic separation has received a lot of attention as a robust, highly efficient and rapid catalyst separation technology. Many studies have focused on developing methodologies for the immobilization of catalytic active species, but the development of magnetic supports has been mainly limited to silica, polymer or carbon-coated magnetic nanoparticles (NPs). The design of magnetic nanocomposites and the incorporation of other oxides are highly welcome to broaden the application of this separation technology in the field of catalysis. In this context, studies of the thermal stability of silica-coated magnetite (Fe3O4@SiO2) were performed to evaluate the possibility of calcining it without losing the magnetic properties of the support. The calcination would permit the deposition of different oxides on the silica surface, such as ceria and titania. The calcined Fe3O4@SiO2 material preserved the core-shell morphology and magnetic properties, but increased its surface area six times. New magnetic supports were developed by using post-coating process for the deposition of ceria and titania onto silica-coated magnetite. Magnetically recoverable Rh, Pd and Ru nanocatalysts were prepared. The catalysts were employed in hydrogenation of cyclohexene, benzene or phenol and the study of the influence of each support on the catalytic activity was a main objective of this thesis. The catalysts were prepared by two different approaches: the impregnation and the sol-immobilization of pre-formed metal NPs. The colloidal metal NPs were prepared by reduction of metal salts and also by decomposition of organometallic complexes. Rhodium catalysts prepared by impregnation of rhodium(III) chloride and reduction with H2 showed some reproducibility issues that were surpassed by using NaBH4 or hydrazine as reducing agents. The preparation of catalysts by the immobilization of colloidal NPs is an interesting alternative to obtain reproducible and very active catalysts. Nanoparticles of Pd, Rh and Ru were prepared by an organometallic approach and immobilized on calcined Fe3O4@SiO2, Fe3O4@SiO2CeO2 and Fe3O4@SiO2TiO2. The elimination of the stabilizing agent leads to more active catalysts upon recycling. Rhodium catalysts supported on ceria support was the most active catalyst in the hydrogenation of cyclohexene (TOF 125,000 h-1). Palladium catalysts were the most selective catalyst for the hydrogenation of phenol to cyclohexanone, no matter the support used. The formation of cyclohexanol is enhanced with titania and the hydrodeoxygenation to produce cyclohexane occurred mainly with silica.
A separação magnética tem recebido muita atenção como uma tecnologia robusta, altamente eficiente e rápida para recuperar catalisadores sólidos após uso em reações em fase líquida. Muitos estudos têm focado nas metodologias para a imobilização de espécies cataliticamente ativas, mas o desenvolvimento de suportes magnéticos tem se limitado a nanopartículas magnéticas revestidas com sílica, polímeros ou carbono. O desenvolvimento de nanocompósitos magnéticos com a incorporação de outros óxidos é muito desejável para ampliar a aplicação dessa tecnologia de separação em catálise. Nesse contexto, estudos da estabilidade térmica de magnetita revestida com sílica (Fe3O4@SiO2) foram realizados para avaliar a possibilidade de calcina-la sem perder as propriedades magnéticas do suporte. Uma etapa de calcinação é necessária para a deposição de diferentes óxidos na superfície da sílica, tais como céria e titânia. O Fe3O4@SiO2 calcinado preservou a morfologia \"core-shell\" e as propriedades magnéticas, porém apresentou um aumentou de seis vezes na área superficial. Novos suportes magnéticos foram desenvolvidos pela deposição de céria e titânia sobre magnetita previamente revestida com sílica. Nanocatalisadores magneticamente recuperáveis de Rh, Pd e Ru foram preparados. Os catalisadores foram utilizados na hidrogenação de ciclo-hexano, benzeno ou fenol e o principal objetivo dessa tese foi o estudo da influência de cada suporte na atividade catalítica. Os catalisadores foram preparados de duas formas diferentes: impregnação-redução e imobilização de nanopartículas (NPs) metálicas pré-formadas. As NPs coloidais foram preparadas pela redução de sais metálicos e, também, pela decomposição de complexos organometálicos. Catalisadores de ródio preparados pela impregnação de cloreto de ródio(III) e redução com H2 mostraram alguns problemas de reprodutibilidade, que foram superados utilizando NaBH4 ou hidrazina como agentes redutores. A preparação de catalisadores pela imobilização de NPs coloidais é uma alternativa interessante para obter catalisadores reprodutíveis e muito ativos. Nanopartículas de Pd, Rh e Ru foram preparadas a partir de organometálicos e imobilizadas em Fe3O4@SiO2 calcinada, Fe3O4@SiO2CeO2 e Fe3O4@SiO2TiO2. A eliminação do agente estabilizante torna os catalisadores mais ativos durante os reusos. O catalisador de Rh sobre o suporte de céria foi o catalisador mais ativo na hidrogenação de ciclohexeno (TOF 125000 h-1). O catalisador de Pd foi o catalisador mais seletivo para a hidrogenação de fenol em ciclo-hexanona, independente do suporte usado. A formação de ciclo-hexanol é favorecida pelo suporte de titânia e a hidrodesoxigenação para produzir ciclo-hexano ocorreu principalmente no suporte de sílica.
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Church, Nathan Stewart. "Magnetic properties of iron-titanium oxides and their nanoscale intergrowths." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609524.

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Noganta, Siyasanga. "Photocatalytic degradation of organic pollutants using Ag-Fe₃O₄/SiO₂/TiO₂ nanocomposite." Thesis, University of the Western Cape, 2015. http://hdl.handle.net/11394/5208.

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>Magister Scientiae - MSc
The global lack of clean water for human sanitation and other purposes has become an emerging dilemma for human beings. The presence of organic pollutants in wastewater produced by textile industries, leather manufacturing and chemical industries is an alarming matter for a safe environment and human health. For the last decades, conventional methods have been applied for the purification of water but due to industrialization these methods fall short. Advanced oxidation processes and their reliable application in degradation of many contaminants have been reported as a potential method to reduce and/or alleviate this problem. Lately, it has been assumed that incorporation of some metal nanoparticles such as magnetite nanoparticles as photocatalyst for Fenton reaction could improve the degradation efficiency of contaminants. Core/shell nanoparticles, are extensively studied because of their wide applications in the biomedical, drug delivery, electronics fields and water treatment. The current study is centred on the synthesis of silver-doped Fe₃O₄/SiO₂/TiO₂ photocatalyst. Magnetically separable Fe₃O₄/SiO₂/TiO₂ composite with core–shell structure were synthesized by the deposition of uniform anatase TiO₂ NPs on Fe₃O₄/SiO₂ by using titanium butoxide (TBOT) as titanium source. Then, the silver is doped on TiO₂ layer by hydrothermal method. Integration of magnetic nanoparticles was suggested to avoid the post separation difficulties associated with the powder form of the TiO₂ catalyst, increase of the surface area and adsorption properties. Lastly and most importantly magnetic nanoparticles upsurge the production of hydroxyl groups or reduced charge recombination. The a synthesized catalysts were characterized using Transmission Electron Microscopy, X-ray Diffraction; Infra-red Spectroscopy, Scanning Electron Microscope and Energy Dispersive Spectroscopy. Other characterization techniques includeVibrating Sample Magnetometry, Brunauer Emmett Teller analysis and Thermogravimetric analysis. The average size of the particles size is 72 nm. Furthermore the photocatalytic performances of the magnetic catalysts were assessed in comparison with that commercial titanium dioxide for the degradation of methylene blue using photochemical reactor under ultra violet light. The results showed that the photocatalytic activity was enhanced using Fe₃O₄/SiO₂/TiO₂ and Ag-Fe₃O₄/SiO₂/TiO₂ compared with that for Fe₃O₄, commercial titanium dioxide powder.
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Rumaiz, Abdul K. "Cobalt doped titanium dioxide, a possible candidate for dilute magnetic semiconductor." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 149 p, 2008. http://proquest.umi.com/pqdweb?did=1459915881&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Daniel, Lisa Maree. "Laponite-supported titania photocatalysts." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16669/.

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This thesis describes the synthesis and characterisation of titania photocatalysts for incorporation into a polyethylene film. Monodisperse, anatase-phase titania nanoparticles are prepared and the synthesis conditions necessary for attraction to a laponite clay support are determined. Methods of preventing agglomeration of the laponite system such as the use of a polyethylene oxide surfactant or chemical modification of the laponite plate edges with a dimethyloctyl methoxysilane are also explored. Finally, photocatalytic studies on the laponite-supported titania nanoparticles are performed, and the compatibility and photoactivity of these materials in the polyethylene film are examined.
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Ali, Bakhtyar. "Study of titanium dioxide based dilute magnetic semiconductors the role of defects and dopants /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 85 p, 2008. http://proquest.umi.com/pqdweb?did=1597633311&sid=20&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Zhang, Shixiong. "Unusual electronic transport and magnetism in titanium oxide based semiconductors and Metals." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7736.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.
Thesis research directed by: Dept. of Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Books on the topic "Titanian magnetite"

1

I, Shabalin L., and Manokhin A. I, eds. Titanomagnetity: Mestorozhdenii͡a︡, metallurgii͡a︡, khimicheskai͡a︡ tekhnologii͡a︡. Moskva: "Nauka", 1986.

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Sichuan hong ge fan tai ci tie kuang chuang cheng kuang tiao jian ji di zhi te zheng. Beijing: Di zhi chu ban she, 1987.

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Luepke, Gretchen. Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties, California. Menlo Park, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Luepke, Gretchen. Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties, California. Menlo Park, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Luepke, Gretchen. Variations in titanium and chromium concentrations in magnetite separates from beach and offshore sediments, San Francisco and San Mateo counties, California. Menlo Park, Calif: U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Dodin, D. A. Platinometallʹnye mestorozhdenii︠a︡ mira. Moskva: OOO "Geoinformt︠s︡entr,", 2003.

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Collings, E. W. Applied Superconductivity, Metallurgy, and Physics of Titanium Alloys: Fundamentals Alloy Superconductors: Their Metallurgical, Physical, and Magnetic-Mixed-State Properties. Boston, MA: Springer US, 1986.

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United States. National Aeronautics and Space Administration., ed. Autonomous magnetic float zone microgravity crystal growth application to TiC and GaAs. Glastonbury, Conn: Scientific Research Associates, Inc., 1992.

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Autonomous magnetic float zone microgravity crystal growth application to TiC and GaAs. Glastonbury, Conn: Scientific Research Associates, Inc., 1992.

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E, Grosz A., Foscz Victoria M, and Geological Survey (U.S.), eds. Induced polarization and magnetic response of titanium-bearing placer deposits in the southeastern United States. [Reston, Va.?]: Dept. of the Interior, U.S. Geological Survey, 1985.

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Book chapters on the topic "Titanian magnetite"

1

Collings, E. W. "Magnetic Susceptibility." In Applied Superconductivity, Metallurgy, and Physics of Titanium Alloys, 275–305. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2095-1_7.

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Stokłosa, Andrzej, and Stefan S. Kurek. "Titanium-doped Magnetite – (Fe1−xTix)3±δO4." In Structure and Concentration of Point Defects in Selected Spinels and Simple Oxides, 75–95. First edition. | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003106166-5.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of titanium(III) silylated arylamide." In Magnetic Properties of Paramagnetic Compounds, 62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_28.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of dimeric titanium(III) aryloxide." In Magnetic Properties of Paramagnetic Compounds, 63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_29.

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Collings, E. W. "Magnetic Properties of Superconductors." In Applied Superconductivity, Metallurgy, and Physics of Titanium Alloys, 473–98. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2095-1_13.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of binuclear σ-alkenycarboxylate complex titanium(III)." In Magnetic Properties of Paramagnetic Compounds, 61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_27.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of bis[(trimethylsilyl)benzamidinato] titanium(III) borohydride." In Magnetic Properties of Paramagnetic Compounds, 619–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_299.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of titanium(III) complex supported by benzamidinate ligand." In Magnetic Properties of Paramagnetic Compounds, 43–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_17.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of binuclear σ-alkenylcarboxylate complex of titanium(III)." In Magnetic Properties of Paramagnetic Compounds, 60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_26.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of trimeric titanium(III) aryloxide complex with TMEDA." In Magnetic Properties of Paramagnetic Compounds, 74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_35.

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Conference papers on the topic "Titanian magnetite"

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Nuroni, M. Sofiyudin, Ahmad Taufiq, and Sunaryono. "Preparation and characterization of nanosized magnetite/titania@emeraldine composites." In INTERNATIONAL CONFERENCE ON ELECTROMAGNETISM, ROCK MAGNETISM AND MAGNETIC MATERIAL (ICE-R3M) 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0015625.

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Dantal, B. R., A. Saigal, and M. A. Zimmerman. "Polarization Measurements of Molded Liquid Crystal Polymer/Titania Composites." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37558.

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During the past decade, the preparation of inorganic/organic hybrid materials with high refractive index has attracted considerable attention. In particular, TiO2 (Titanium dioxide or Titania), as inorganic domains, have been incorporated into a polymer matrix to produce high refractive index hybrid materials [1–3]. Polarization of injection molded liquid crystal polymer/Titania composite parts have been investigated in the broad band millimeter wave frequency range. The measurements have been performed by using two different spectroscopy techniques. First, free space quasi optical millimeter wave spectrometer, equipped with a high power source coherent radiation tunable in the 40–90 GHz frequency range is used. Second, low power dispersive Fourier transform spectrometer has been used for higher frequencies in the range of 100–600 GHz. Dielectric properties of liquid crystal polymer/Titania composites have been determined in the broad band millimeter wave frequency range. A correlation between dielectric properties and dispersed Titania weight percent has been observed using the two spectroscopy techniques. It is found that the absorption coefficient and loss tangent is a strong function of the output power of the sources of the incident radiation. On the other hand, refractive index and real permittivity values measured from both spectroscopy techniques are similar. In addition, it has been found that transmittance level and absorption losses depend on the orientation of the samples with respect to the orientation of electric and magnetic fields in the incident electro-magnetic wave. Finally, the polarization of the parts varies with the direction of flow of the molten plastic into the cavity.
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Mapps, D. J., M. A. Akhter, and G. Pan. "Very thin CoCr films titanium underlayers for high-density perpendicularrecording computer discs." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734331.

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Kurinobu, S., K. Tsurusaki, M. Hasegawa, and K. Kimata. "Decomposition of organic substances using magnetic titania photocatalyst particles." In INTERMAG Asia 2005: Digest of the IEEE International Magnetics Conference. IEEE, 2005. http://dx.doi.org/10.1109/intmag.2005.1464209.

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Galizia, P., I. V. Ciuchi, M. Anbinderis, R. Grigalaitis, and C. Galassi. "Titania-cobalt ferrite ceramic composites for high frequency magnetic applications." In 2015 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2015. http://dx.doi.org/10.1109/iceaa.2015.7297406.

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Carreon, Hector, and Alberto Ruiz. "Detection of Fretting Damage in a Titanium Alloy by the Magnetic Sensing of Thermoelectric Currents." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66021.

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The experimental technique used in this investigation is based on magnetic sensing of local thermoelectric currents produced by material imperfections when a temperature gradient is established in the material. These thermoelectric currents generate flux magnetic densities that are detected by a highly sensitive magnetometer. According to our preliminary results, the magnetic flux density measurements was found to be rather sensitive to changes in near-surface layers produced by the fretting damage in Ti-6Al-4V alloy specimens with the exception of the intrinsic material background magnetic signal that affected deeply the detectability of subtle material variations in noncontacting thermoelectric measurements. Hopefully, these results can help identify a non-destructive test method that can detect the level of fretting damage in metals, that is difficult to characterize by other well known NDE methods.
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Yuan, Siming, and Qiang Chen. "Numerical and Experimental Research on the Ultimate Strength for a Stiffened Titanium Cylinder." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78663.

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Titanium alloys are widely used in naval ships due to its high strength, low density, no magnetism, corrosion resistance and so on. However, the material nonlinearity brings new challenges to the ultimate strength evaluation on the Titanium structure. This work is to evaluate the ultimate strength for a stiffened titanium cylinder with consideration of material nonlinearity by numerical analysis and scaled model experiment. Firstly, a series of titanium alloy stiffened cylinder pressure hulls are analyzed for their ultimate strength by non-linear Finite Element Method (FEM). Secondly, model tests are carried out for the above titanium cylinders to obtain their ultimate carrying capacity. Thirdly, the good agreement between experiment and numerical results verify that the numerical simulation method is suitable for ultimate strength evaluation. Finally, some influential factors on the ultimate capacity of the stiffened titanium cylinder are investigated, including stiffeners arrangement, thickness of cylinder hulls, inside diameter. The research work can map the limitations of the current rules and to support the development of ultimate strength assessment guidelines for titanium cylinder pressure hulls.
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Vial, Karine, and Dhananjay Kumar. "Shape Anisotropy Study of Nickel and Iron/Cobalt Nanoparticles." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12631.

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Shape anisotropy of Nickel and Iron/Cobalt nanoparticles embedded respectively in gold and Titanium/Nitride thin film matrix on a sapphire substrate has been study. The samples have been fabricated using a pulsed laser deposition. The measurements of magnetic moment per cm2 versus magnetic field at different temperatures (10 K and from 50 K to 300 K every 50 K) and with a magnetic field applied parallel to the sample or perpendicularly have been made in order to determine the coercivity of the material for these parameters. We also report our investigation on the magnetoresistance effect per cm2, where measurements have been lead for different temperatures (10 K, 100 K, 200 K, and 300 K) and two positions of the sample (parallel and perpendicular to the magnetic field). The comparison of the two cases, magnetic field parallel and magnetic field perpendicular to the sample, has shown that the difference of coercivity between them decreases when the temperature increases for all samples. For gold/nickel monolayer samples the difference varies from 120 Oe at 10 K to 6 Oe at 300 K for coercivities of about 200 Oe to 450 Oe at 10 K depending on the sample to coercivities of about 80 Oe to 150 Oe at 300K depending on the sample. For Titanium-Nitride/ Iron-Cobalt monolayer and trilayers samples the difference of coercivities varies between 10 Oe to 500 Oe depending on the temperature and the sample for coercivities between 30 Oe and 750 Oe. The difference in the percentage of magnetoresistance at 0 Oe is between 5 to 40% for Au/Ni sample and 0% to 10% for TiN/FeCo samples.
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Medvedev, Alexander. "AN ENVIRONMENTAL ASSESSMENT OF PLANS FOR ECONOMIC DEVELOPMENT OF KACHKANAR TITANIUM-MAGNETITE MINE IN RUSSIA." In 16th International Multidisciplinary Scientific GeoConference SGEM2016. Stef92 Technology, 2016. http://dx.doi.org/10.5593/sgem2016/b12/s03.005.

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Jaiganesh, G., and S. Mathi Jaya. "Electronic structure and magnetism of titanium substituted Cd3P2: An ab-initio study." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5033127.

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Reports on the topic "Titanian magnetite"

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Mayhall, D., W. Stein, and J. Gronberg. Computer Calculations of Eddy-Current Power Loss in Rotating Titanium Wheels and Rims in Localized Axial Magnetic Fields. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/899424.

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