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Dissertations / Theses on the topic 'FeCO3'

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Published: 4 June 2021
Last updated: 3 February 2022

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1

De, Motte Rehan Anthony. "A combined experimental and modelling approach to elucidate FeCO3 scale formation kinetics." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/16062/.

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In CO2 corrosion, when the local concentrations of Fe2+ and CO32- ions exceed the solubility limit, precipitation of iron carbonate (FeCO3) can occur internally within pipework, forming a protective corrosion barrier at the steel-electrolyte interface. Accurately quantifying the rate of precipitation of this film is important within the oil and gas industry as it can be implemented into corrosion prediction tools to provide a more reliable estimate of anticipated corrosion rates. Existing precipitation rate models are based on measurements conducted in a glass cell in static conditions where t
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2

Burkle, Daniel Phillip. "Understanding the formation of protective FeCO3 on to carbon steel pipelines during CO2 corrosion." Thesis, University of Leeds, 2017. http://etheses.whiterose.ac.uk/17608/.

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In the oil and gas industry, internal corrosion of carbon steel pipelines is commonly encountered during production and transportation of carbon dioxide (CO2)-containing salt water and hydrocarbons. The growth of iron carbonate (FeCO3) on the internal walls of carbon steel pipelines can reduce internal corrosion by blocking active sites on the steel surface and creating a diffusion barrier. Two of the key aspects to consider when predicting pipeline corrosion rates in CO2 environments are the kinetics of film formation and level of protection afforded by the film under different operating cond
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3

Llorens, Isabelle. "Etude de la coprécipitation du technétium-99 avec la sidérite (FeCO3) comme phase d'accueil." Paris 11, 2007. http://www.theses.fr/2007PA112336.

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La coprécipitation des radionucléides avec des phases secondaires est un phénomène actuellement négligé dans les études de sûreté d’un stockage des déchets nucléaires en formation géologique profonde. La coprécipitation peut, pourtant, jouer un rôle important dans la rétention des radionucléides en limitant leur concentration en solution. Le but de ce travail est d’étudier la coprécipitation du technétium-99 avec la sidérite comme phase d’accueil. Le coprécipitation a été étudiée en fonction des rapports initiaux Tc/Fe. Dans cet objectif, une méthode de coprécipitation a été mise au point en m
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4

Klok, Simone Maria. "Avaliação da supersaturação na formação da camada de FeCO3 no processo corrosivo do aço carbono em meio de NaCl saturado com CO2." reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/53496.

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Orientador: Prof. Dr. Haroldo de Araújo Ponte<br>Tese (doutorado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia e Ciência dos Materiais - PIPE. Defesa: Curitiba, 18/09/2017<br>Inclui referências : f. 122-126<br>Área de concentração: Engenharia e ciência de materiais<br>Resumo: O aço carbono é amplamente empregado na exploração, produção e escoamento de gás e petróleo. Porém, é suscetível à corrosão por dióxido de carbono. Sob condições específicas, pode ocorrer a formação e o depósito de um produto de corrosão, o carbonato de ferro (FeCO3), que
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5

Ieamsupapong, Supat. "Mechanisms of Iron Carbonate Formation on Mild Steel in Controlled Water Chemistry Conditions." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1473264400862079.

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6

Müller, Jan [Verfasser], Monika [Akademischer Betreuer] Koch-Müller, Sandro [Akademischer Betreuer] Jahn, et al. "P-T-X phase diagrams of carbonates : focus on the FeCO3−MgCO3 and CaCO3−MgCO3 solid solution series / Jan Müller ; Gutachter: Thomas Neumann, Monika Koch-Müller, Sandro Jahn, Ronald Miletich-Pawliczek ; Monika Koch-Müller, Sandro Jahn." Berlin : Technische Universität Berlin, 2018. http://d-nb.info/1168722233/34.

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7

Mansoori, Hamed. "Influence of Calcium and Magnesium Ions and their Carbonate Scales on CO2 Corrosion of Mild Steel." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1578414196892282.

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8

Walock, Michael James. "Interfacial interactions of FeCo/Pd and FeCo/Ru multilayers." Thesis, [Tuscaloosa, Ala. : University of Alabama Libraries], 2009. http://purl.lib.ua.edu/43.

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9

Rodrigues, Marcos Renan Flores. "Estudo e caracterização de nanopartículas de Fe3O4, Fe2O3, Fe3O4/ Aunanop E Fe2O3/Aunanop." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/184573.

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Nanopartículas de Fe3O4 e Fe2O3 foram sintetizadas a partir da rota de coprecipitação, em atmosfera de N2, mantendo-se o pH entre 9 e 14 na temperatura ambiente e utilizando como precursores o FeCl2 e FeCl3. Após a síntese, as nanopartículas foram tratadas termicamente a 250, 500 e 800 oC. Para obtenção de um sistema híbrido, foram sintetizadas nanopartículas de ouro sobre as nanopartículas de óxido previamente tratadas em diferentes temperaturas. As amostras foram caracterizadas por UV-Vis, difratometria de Raios-X (DRX), microscopia eletrônica de transmissão (MET), microscopia eletrônica de
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10

Reichert, Dirk. "Untersuchungen zur Reaktion von Stickstoffoxiden und Sauerstoff mit Russ am Katalysator [alpha]-Fe2O3 [alpha-Fe2O3]." Duisburg Köln WiKu-Verl, 2007. http://d-nb.info/987126490/04.

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11

Reichert, Dirk [Verfasser]. "Untersuchungen zur Reaktion von Stickstoffoxiden und Sauerstoff mit Ruß am Katalysator α-Fe2O3 [alpha-Fe2O3] / von Dirk Reichert". Duisburg, 2008. http://d-nb.info/994896115/34.

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12

Komora, Mojmír. "Závislost povrchové struktury Fe2O3(012) na prostředí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382255.

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Táto diplomová práca sa zaoberá štúdiom alfa-Fe2O3(012) vystaveného vodnému prostrediu. Súčasný stav poznania ohľadom oxidov železa s pozornosťou vkladanou do popisu alfa-Fe2O3 a jeho (012) povrchu je stručne zhrnutá. Experimentálná časť tejto práce začína s popisom unikátného zariadenia na depozíciu kvapalnej vody na povrchy monokryštalických vzoriek compatibilného s podmienkami ultra vysokého vákuua. Jednotlivé konštrukčné časti a detaily sú diskutované. Navrhnutý systém bol testovaný na vzorkách striebornej fólie a monokryštálu Fe3O4 s povrchovom v rovine [100]. Chemické zloženie a morfológ
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13

Alshammari, Hanaa Ali. "Heating Power of Coated FeCoV Magnetic Nanoparticles." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1464477896.

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14

Ghopry, Samar A. "Magnetic Properties of Hematite (α-Fe2O3) Nanorods". VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3662.

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At this study three samples of hematite nanorods were deposited on the silicon substrates with different varieties of glancing angle deposition techniques. One sample (S1) was prepared by using thermal deposition with partially ionized beam (PIB) and substrate rotation. The second sample (S2) was synthesized by using thermal deposition with PIB and no substrate rotation. The third sample (S3) was obtained by using E-beam deposition, PIB and rotating substrate. In addition, one sample of magnetite nanorods (S4) has been prepared in order to compare the magnetic properties of the two different i
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15

Giotto, Marcus Vinicius. "Caracterização do PolyParaPhenylene (PPP) dopado com FeCl3, utilizando espectroscopia de alta resolução por ressonância magnética nuclear." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-22112013-101921/.

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O objetivo deste trabalho consiste na caracterização do polímero PolyParaPhenylene (PPP) dopado com FeCl3, usando a técnica de Espectroscopia de Alta Resolução em Sólidos por Ressonância Magnética Nuclear. Os espectros de alta resolução de 13C foram obtidos usando, simultaneamente, as técnicas de desacoplamento em alta potencia (DEC) e rotação da amostra em torno do angulo mágico (MASS). Alterações nos espectros de 13C do PPP dopado com FeCl3 causadas por defeitos na cadeia polimérica, tal como polarons e bipolarons, foram analisadas. Efeitos de variação de temperatura e purificação sobre os e
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16

Zubris, Melissa A. "Synthesis and microstructure of FeCo nanoalloys." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/19014.

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17

Filho, Alberto de Souza Melo. "O mapeamento da pobreza e da cobertura dos programas governamentais nos municÃpios do Estado do CearÃ." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=10608.

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nÃo hÃ<br>Utilizando dados do IBGE, IPECE, IPEA e SEPLAG, este presente trabalho faz o Mapeamento da pobreza e da distribuiÃÃo dos recursos dos programas sociais FECOP - Fundo Estadual de Combate à Pobreza (Programa do Governo do Estado do CearÃ) e Programa Bolsa FamÃlia (Programa do Governo Federal) nos MunicÃpios Cearenses no ano de 2010. As relaÃÃes existentes entre os nÃveis de pobreza e as coberturas dos programas sociais sÃo analisadas a partir da construÃÃo e cÃlculo dos Ãndices de Cobertura Municipal destes programas, e de estatÃsticas globais de eficÃcia na distribuiÃÃo dos recursos.
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18

Almeida, Trevor P. "Hydrothermal synthesis and characterisation of α-Fe2O3 nanorods". Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/11685/.

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The hydrothermal synthesis (HS) of α-Fe2O3 nanorods (NRs) is investigated using a combination of complementary analytical techniques. The construction of an HS ‘process map’ as a function of temperature, time and phosphate (PO43-) concentration provides insight into the nature of intermediate β-FeOOH NR precipitation, dissolution and subsequent α-Fe2O3 growth, along with the effect of PO43- anion concentration on the development of α-Fe2O3 particle shape. An HS processing temperature of 200˚C and an Fe3+ : PO43- molar ratio of 31.5 yielded crystalline acicular α-Fe2O3 NRs with an aspect ratio
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Ovcharenko, Roman. "Interaction of Water with the Fe2O3(0001) Surface." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19247.

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Diese Arbeit ist eine umfassende und systematische Untersuchung der Adsorption von Wasser auf der Fe2O3(0001)-Oberfläche. Sie deckt eine Vielzahl der Probleme auf, die während des Anfangs der Wasseradsorption auf den Übergangsmetalloxidoberflächen auftreten. Dazu gehören die Stabilität der reinen Oberfläche, die Rolle der Oberflächendefekte, der Einfluss der kristallographischen und elektronischen Strukturen, die elementare Kinetik der adsorbierten Arten von Wasser auf der Oberfläche, die Eigenschaften bei niedrigem und hohem Bedeckungsgrad und die Auswirkungen der Wasserstoffbrückenbindung au
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Muniz, Lucia de FÃtima Dantas. "ContribuiÃÃo do programa FECOP ao desenvolvimento do CearÃ." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4689.

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nÃo hÃ<br>The present work aims to investigate and to know if the contribution of the FECOP â Fundo Stadia de Combated à Pores, in the improvement of the IDM - Index of Municipal Development - of the state of Cearà cities, with consequent improvement of the quality of life and reduction of the poverty, main objective of the program created by the Government of the State of the CearÃ. The institution of the FECOP represented a benchmark in the political history of CearÃ, a state characterized by high concentration of income and poor people, therefore, it was created for the first time a specifi
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Muniz, Lucia de Fátima Dantas. "Contribuição do programa FECOP ao desenvolvimento do Ceará." reponame:Repositório Institucional da UFC, 2010. http://www.repositorio.ufc.br/handle/riufc/5726.

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MUNIZ, Lúcia de Fátima Dantas. Contribuição do programa FECOP ao desenvolvimento do Ceará. 2010. 87f. Dissertação (mestrado profissional) - Programa de Pós Graduação em Economia, CAEN, Universidade Federal do Ceará, Fortaleza, CE, 2010.<br>Submitted by Mônica Correia Aquino (monicacorreiaaquino@gmail.com) on 2013-09-03T16:56:08Z No. of bitstreams: 1 2010_dissert_lfdmuniz.pdf: 114294 bytes, checksum: 9efe8f76642d1938868fb52302820126 (MD5)<br>Approved for entry into archive by Mônica Correia Aquino(monicacorreiaaquino@gmail.com) on 2013-09-03T16:56:19Z (GMT) No. of bitstreams: 1 2010_dissert_lfd
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Arruda, Joana Emiliana. "Oxidação verde de cicloexanol catalisada por FeCl3/H2O2." reponame:Repositório Institucional da UFABC, 2013.

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23

Araújo, Marcos Lopes de. "Oxidação verde de acetol catalisada por FeCl3/H2O2." reponame:Repositório Institucional da UFABC, 2015.

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Orientador: Prof. Dr. Dalmo Mandelli<br>Dissertação (mestrado) - Universidade Federal do ABC. Programa de Pós-Graduação em Ciência e Tecnologia/Química, 2015.<br>Reações envolvendo a oxidação parcial de compostos organicos são importantes para um grande numero de processos industriais, incluindo a sintese de produtos de quimica fina. Com o objetivo de se obter rotas sustentaveis, e fundamental o desenvolvimento de catalisadores que sejam capazes de promover a sintese dos produtos desejados de forma eficiente, minimizando-se a geracao de substancias toxicas. Nesse contexto, o uso de H2O2 como a
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Souza, Bruna Gonçalves de. "Catalisadores de Fe2O3, NiO e Fe2O3 - NiO Suportados in situ em Ce0,5Zr0,5O2 e Ce0,2Zr0,8O2 – Avaliação na Redução de NO com CO." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/7267.

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Submitted by Izabel Franco (izabel-franco@ufscar.br) on 2016-09-19T19:41:33Z No. of bitstreams: 1 DissBGS.pdf: 2899470 bytes, checksum: a3a468cd5c6b79bbc4f8adf4720788bd (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-20T14:03:37Z (GMT) No. of bitstreams: 1 DissBGS.pdf: 2899470 bytes, checksum: a3a468cd5c6b79bbc4f8adf4720788bd (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-20T14:03:44Z (GMT) No. of bitstreams: 1 DissBGS.pdf: 2899470 bytes, checksum: a3a468cd5c6b79bbc4f8adf4720788bd (MD5)<br>Made available
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Ninjbadgar, Tsedev. "Polymer coated γ-Fe2O3 nanoparticles : Synthesis and physical properties". 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/145461.

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Nguyen, Hoang Nam. "Creating nano composite TiO2.Fe2O3/laterite material applying to treat arsenic compound in groundwater." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-176920.

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This article presents nano composite TiO2.Fe2O3/laterite materials, which were successfully prepared by hydrometallurgical method. The materials were modified using urea as the nitrogen source. The particles size of the materials is from 20-30 nanometers. The obtained materials can not only absorb arsenic compounds but also enhance the ability of converting As (III) or As (V) into Aso, which is removed from solution. Arsenic removal efficiency of these materials is high. Using sunlight in a hydraulic retention time, about 180 minutes, the arsenic value at the inflow was about 10 mg/L but the o
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Abbasi, Shahkooh Sadegh. "Dynamic wavelength routing in packet-oriented WDM optical networks." Thesis, University of Bristol, 2003. http://hdl.handle.net/1983/e20d5572-fec3-44b1-ae14-426f3c9077d7.

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Huber, Jörg. "Zur Natur von [gamma]-Fe2O3 [Gamma-Fe 2 O 3]." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972522255.

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Schmidt, Samara. "SÍNTESE DE PIGMENTOS A BASE DE SnO2 DOPADO COM Fe2O3." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2012. http://tede2.uepg.br/jspui/handle/prefix/1414.

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Made available in DSpace on 2017-07-21T20:42:37Z (GMT). No. of bitstreams: 1 Samara Schmidt.pdf: 2152425 bytes, checksum: fb332f072ac95b26d2a0afaf94d0a90a (MD5) Previous issue date: 2012-03-29<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>In this work a Fe(III)-doped tin oxide (SnO2) system using chemical mixture of SnO2 and Iron(III) nitrate nonahydrate (Fe(NO3)3. 9H2O). This system was calcined at temperatures from 600 ºC to 1200 C. The as-calcined powders were characterized using several techniques: thermal analysis (DTA/TG) to identify the thermal stability;X-ray diff
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Maranha, Filipy Gobbo. "ESTUDO DO SISTEMA LaAl1 FexO3 PARA APLICAÇÃO COMO PIGMENTO CERÂMICO." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/2030.

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Made available in DSpace on 2017-07-24T19:37:51Z (GMT). No. of bitstreams: 1 FILIPY GOBBO MARANHA.pdf: 9851760 bytes, checksum: 4b667c83e658c04d1de2cc4091b59e0c (MD5) Previous issue date: 2014-07-30<br>Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná<br>The system LaAl1-xFexO3 was synthesized through the Modid Pechini Method (MPM) and solid state reaction (SSR) to evaluate its applicability as a ceramic pigment. The MPM synthesis was carried out with metallic ion nitrates and thermal treatment at 910 °C for 4 hours, while the SSR syntheses comprised metallic
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Pereira, Luzyanne de Jesus Mendonça. "Estudo teórico do C60 sólido intercalado com FeCl3 e CrO3." Universidade Federal do Maranhão, 2011. http://tedebc.ufma.br:8080/jspui/handle/tede/1592.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-06-07T18:43:28Z No. of bitstreams: 1 LuzyannePereira.pdf: 2863158 bytes, checksum: ff3a4e65449af34c7e12b19e0f749f60 (MD5)<br>Made available in DSpace on 2017-06-07T18:43:28Z (GMT). No. of bitstreams: 1 LuzyannePereira.pdf: 2863158 bytes, checksum: ff3a4e65449af34c7e12b19e0f749f60 (MD5) Previous issue date: 2011-08-30<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>In this dissertation we present, by computational simulations based in the density functional theory implemented in the SIESTA code, a study on
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Zheng, Ma. "Synthesis and Characterization of ε-Fe2O3 Nanoparticles and Thin Films". Doctoral thesis, Universitat Autònoma de Barcelona, 2021. http://hdl.handle.net/10803/671968.

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Al llarg de les dues darreres dècades, el polimorf d’òxid de ferro(III) ε-Fe2O3 ha passat de ser una raresa científica a estar a centre d’una intensa activitat de recerca a causa del seves propietats multiferroiques elevada coercivitat a temperatura ambient. Aquestes propietats tan poc habituals posen de relleu aspectes fonamentals relacionats amb la complexitat del seu diagrama de fases magnètic i susciten interès per les seves aplicacions potencials en tecnologies de la informació o fotocatàlisi. Tot i aquest interès creixent, la síntesi i caracterització de materials de tipus ε-(Fe1-xMx)2O3
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EsmaeilySabetRoudsari, Sareh [Verfasser], Lambert [Akademischer Betreuer] Alff, and Oliver [Akademischer Betreuer] Gutfleisch. "Investigation of Structural and Magnetic Properties in MnBi/FeCo and MnGa/FeCo Exchange Spring Bilayers / Sareh EsmaeilySabetRoudsari ; Lambert Alff, Oliver Gutfleisch." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1200099435/34.

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Pires, Neto Nilson do Espírito Santo. "Catalisadores à base de CuO, Fe2O3 ou CuO-Fe2O3 suportados sobre y-Al2O3, ZrO2 ou ZrO2/y-Al2O3 para a redução de NO com CO." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/4145.

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Made available in DSpace on 2016-06-02T19:56:55Z (GMT). No. of bitstreams: 1 6143.pdf: 2289936 bytes, checksum: dcf4b81e424bb217ab83315f71624407 (MD5) Previous issue date: 2014-03-31<br>Universidade Federal de Sao Carlos<br>NO, NO2 and N2O nitrogen oxides, named NOx, strongly contribute to the air pollution and to minimize their emissions are used catalytic processes. The catalytic reduction of NO with CO has the advantage to simultaneously abate both pollutants. For that reaction are used noble metal based catalysts, but due to their scarcity and high cost, many research have been establi
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Queiroz, Ruy Scanho Marques de. "Avaliação de reator UASB assistido quimicamente para remoção de fósforo." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3147/tde-08012008-100215/.

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Este trabalho visou avaliar a remoção de fósforo solúvel e total, carga orgânica, sulfetos e sólidos num esgoto doméstico fraco, ao qual se adicionou como coagulante o cloreto férrico, atravessando o manto de lodo de um tratamento anaeróbio UASB. A ETE Ribeirão Pires, aonde este estudo foi desenvolvido, conta com 4 reatores com capacidade para tratar 70 L/s, dos quais 2 foram utilizados, num deles (reator B) foram dosados 25 e 50 mg FeCl3/L e no outro (reator C) não houve dosagem, servindo como referência. Em cada uma das fases, foram realizadas 20 amostragens para DQO, fósforo total e solúvel
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COUTO, ANTONIO A. "Transformacoes de fase e propriedades da liga FECO-2V." reponame:Repositório Institucional do IPEN, 1989. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10246.

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Müller, Peter. "Korozní odolnost litých duplexních ocelí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417137.

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The master’s thesis deals with corrosion resistance of cast duplex steels. In the first part the corrosion mechanisms and their individual types are described, the second part characterizes the types of stainless steels in terms of their properties, use, structural components, and their impact on mechanical and corrosion properties of steels. Individual chapter is dedicated to duplex steels. In the experimental part the resistance of 1.4517 steel against pitting corrosion depending on the alloy contents and the PREN value was investigated. Four specimens graded according to PREN were cast. Sup
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38

Bezencenet, Odile. "Propriétés et couplage d'échange dans le système modèle : Co/alpha-Fe2O3." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2008. http://tel.archives-ouvertes.fr/tel-00341003.

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Le phénomène de couplage d'échange est à la base du fonctionnement des capteurs magnétiques modernes ainsi que des futures mémoires magnétiques non volatiles. Bien que ce phénomène ait été découvert il y a plus de 50 ans et que son principe soit déjà utilisé pour des applications industrielles, les mécanismes physiques mis en jeu ne sont pas entièrement compris. Dans ce contexte, nous avons choisi d'étudier le système Co/alpha-Fe2O3 qui peut être considéré comme un système modèle ferromagnétique/antiferromagnétique pour l'étude du couplage d'échange.<br />Les films d'hématite (alpha-Fe2O3) ont
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39

Lei, Yun School of Chemical Engineering &amp Industrial Chemistry UNSW. "Novel Fe2O3-Cr2O3 catalyst for high temperature water gas shift reaction." Awarded by:University of New South Wales. School of Chemical Engineering and Industrial Chemistry, 2005. http://handle.unsw.edu.au/1959.4/23321.

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The thesis is focused on the study of high temperature water gas shift catalysis, the identification of new improved catalysts and the study of the kinetics and mechanism of reaction over these catalysts. Rh-promoted Fe2O3-Cr2O3 was found to offer best performance which was significantly better than unpromoted catalyst over wide temperatures range. An extensive literature survey is first reported. Guidelines to develop new WGS catalysts are developed. As a result, the activities of precious metals supported on various oxides for high temperature WGS reaction have been tested. Rh(1wt%) doped Fe
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40

Lapinee, Chaipat. "Mesoporous TiO2/Fe2O3 bicomposites : synthesis and mechanistic studies of arsenic scavenging." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/57029.

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Many parts of the world have arsenic contamination problems in drinking and ground water. The high toxicity of arsenic threatens people’s health, since exposure to it can cause cancer and other dangerous diseases. Inorganic arsenic in natural water is found in two oxidation states, AsV(arsenate) or AsIII(arsenite). AsIII has the highest toxicity comparing with AsV and difficult to remove due to zero charge species of AsIII at pH below 9. Consequently, photocatalytic oxidation of arsenite is a key challenge to improve removal efficiencies of future sorbents. Recent work has suggested that a TiO
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41

Serna, Teófanes Berrocal. "Síntese e caracterização de nanopartículas de maghemita (gama-Fe2O3) via eletrodeposição." reponame:Repositório Institucional da UFPR, 2017. http://hdl.handle.net/1884/49384.

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Orientador: Dr. Guilherme Jean Pereira de Abreu<br>Coorientador: Dr. Ney Pereira Mattoso Filho<br>Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Ciências Exatas, Programa de Pós-Graduação em Física. Defesa: Curitiba, 17/02/2017<br>Inclui referências : f. 83-88<br>Resumo: Neste trabalho reporta-se a um método fácil e barato de sintetizar nanopartículas de óxido de ferro, na fase maghemita. As nanopartículas de maghemita foram preparadas pelo método de eletrodeposição utilizando cloreto de ferro FeCl3 sem nenhum outro reagente além de ácidos e bases para regular o pH. Após o p
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42

Laanaiya, Majdouline. "Amélioration des propriétés du ciment par insertion des nanoparticules nano-Fe2O3." Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I007.

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La nanotechnologie ouvre la voie au développement de nouvelles générations de matériaux cimentaires grâce à l’ajout de nanomatériaux (nanofibres, nanotubes et nanoparticules) leur conférant une haute performance et des fonctionnalités nouvelles, permettant ainsi la synthèse de matériaux de construction intelligents et durables. L'hybridation des phases de ciment hydraté par incorporation des nanomatériaux dans une approche ascendante permet la manipulation des caractéristiques structurales du ciment à l'échelle nanométrique affectant ultimement la performance et les propriétés de durabilité à
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43

Santos, Wilmar Bezerra dos. "AvaliaÃÃo SocioeconÃmica do Projeto Agente Rural no Contexto do Fundo Estadual de Combate a Pobreza do CearÃ, MunicÃpio de Granja, 2044/2008." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=5146.

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CoordenaÃÃo de AperfeiÃoamento de NÃvel Superior<br>Secretaria do Planejamento e GestÃoSecretaria do Planejamento e GestÃo<br>Esta dissertaÃÃo consiste numa avaliaÃÃo do Projeto Agente Rural, financiado com recursos oriundos de uma PolÃtica PÃblica de Combate à Pobreza em andamento no Estado do Cearà desde o ano de 2003 com a criaÃÃo do Fundo Estadual de Combate à Pobreza - FECOP. O Fundo tem como foco de aÃÃo âCombater a pobreza, reduzir as desigualdades de renda e promover o crescimento com inclusÃo socialâ sendo seu pÃblico-alvo as famÃlias que se situam abaixo da linha da pobreza, resident
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Nguyen, Hoang Nam. "Creating nano composite TiO2.Fe2O3/laterite material applying to treat arsenic compound in groundwater: Research article." Technische Universität Dresden, 2014. https://tud.qucosa.de/id/qucosa%3A28884.

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This article presents nano composite TiO2.Fe2O3/laterite materials, which were successfully prepared by hydrometallurgical method. The materials were modified using urea as the nitrogen source. The particles size of the materials is from 20-30 nanometers. The obtained materials can not only absorb arsenic compounds but also enhance the ability of converting As (III) or As (V) into Aso, which is removed from solution. Arsenic removal efficiency of these materials is high. Using sunlight in a hydraulic retention time, about 180 minutes, the arsenic value at the inflow was about 10 mg/L but the o
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Williams, Melissa Ann Zubris. "Design of FeCo Nanoalloy Morphology via Control of Reaction Kinetics." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7529.

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Nanoalloys are an exciting new class of materials in the growing field of nanotechnology. Nanoalloys consist of the nanoscale co-aggregation of two or more metals with a potential to form compositionally-ordered phases or superstructures that have properties unlike those of the individual metal clusters or of bulk alloys of the constituent metals. This research seizes the opportunity that the nanoscale domain has to offer, and focuses on the synthesis of iron and cobalt nanoalloys via the simultaneous decomposition of iron cobalt organometallic precursors in a stabilizing environment, accompa
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Garnero, Cyril. "Synthèse organométallique de nanoparticules de FeCo pour l'intégration sur inductance." Thesis, Toulouse, INSA, 2016. http://www.theses.fr/2016ISAT0032/document.

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Le développement rapide des télécommunications soulève de nombreux challenges pour l’amélioration des performances des composants électroniques. Parmi eux, les filtres à mode commun sont particulièrement importants pour la téléphonie. Ils permettent d’éliminer le bruit parasite des signaux électriques et doivent présenter des propriétés optimisées jusqu’aux hautes fréquences (GHz). Ces propriétés dépendent des inductances qui les composent et peuvent donc être significativement augmentées par l’addition d’une couche magnétique douce. Le matériau choisit doit être isolant, posséder une forte pe
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47

Tan, Reasmey. "Propriétés de transport de nanoparticules magnétiques de FeCo auto-organisées." Toulouse, INSA, 2008. http://eprint.insa-toulouse.fr/archive/00000212/.

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Je présente dans ce travail de thèse l’étude des propriétés de transport électronique de nanoparticules de FeCo auto-assemblées. Ces nanoparticules, métalliques et ferromagnétiques, sont obtenues par synthèse chimique et stabilisées par des ligands organiques. Deux types de systèmes ont été étudiés : des solides compacts issus directement de la synthèse (auto-assemblage spontané en réseau 3D) et des réseaux 2D obtenus après dépôt d’une solution de particules. Les mesures de magnéto-transport réalisées sur ces deux types d’échantillons nous ont donc permis d’étudier le rôle de la dimensionnalit
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48

Khadra, Ghassan. "Magnetic and structural properties of size-selected FeCo nanoparticle assemblies." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10145/document.

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Dans ce travail, nous nous sommes intéressés aux propriétés magnétiques intrinsèques (moments et anisotropie magnétiques) de nanoparticules bimétalliques fer-cobalt. Pour cela, des agrégats FeCo dans la gamme de taille 2-6 nm ont été préparés en utilisant la technique MS-LECBD (Mass Selected Low Energy Cluster Beam Deposition) et enrobés en matrice in − situ afin de les séparer, d'éviter leur coalescence pendant les recuits et de les protéger à leur sortie à l'air. Dans un premier temps, les propriétés structurales (dispersion de taille, morphologie, composition, structure cristallographique) o
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49

Cohen, Persiano Aba Israel. "Structure and physical properties of soft magnetic FeCo based alloys." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37976.

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50

Neto, Vanildo Souza Leão. "Síntese e caracterização do eletrodo de ?-Fe2O3/rGO para aplicação em fotoeletrocatálise." Universidade Estadual de Londrina. Centro de Ciências Exatas. Programa de Pós-Graduação em Química, 2015. http://www.bibliotecadigital.uel.br/document/?code=vtls000201146.

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A fotoeletrocatálise vêm sendo investigada devido a sua alta eficiência na remoção de contaminantes orgânicos na busca da mineralização destes poluentes. A hematita (?-Fe2O3) é um semicondutor considerado promissor para este processo. A ?-Fe2O3, semicondutor do tipo-n, possui uma energia de band-gap de 2,2 eV (região da luz visível). Sua atividade fotocatalítica é diminuída por alguns fatores, como o tamanho das partículas ou defeitos na sua estrutura, por exemplo. Umas das alternativas para a melhora destas características é a realização da dopagem pela modificação de sua estrutura eletrônica
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