Relevant bibliographies by topics / Superparamagnetismo / Dissertations / Theses
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Dissertations / Theses on the topic 'Superparamagnetismo'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Barbosa, Mateus Bruno. "Superparamagnetismo em Jacobsitas sint?ticas." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18600.

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Made available in DSpace on 2015-03-03T15:15:27Z (GMT). No. of bitstreams: 1 MateusBB_DISSERT.pdf: 4491805 bytes, checksum: 6567583b83544d78b05fe6787b44a3ce (MD5) Previous issue date: 2012-03-27<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>In this experimental study sintetic samples of Jacobsites (MnFe2O4) were synthesized by the Pechini method and calcined within ambient atmosphere and afterwards in the vacuum from 400 to 700?C, the range of calcination temperatures. The X-Ray Diffraction (XRD) and the Scanning Electronic Microscopy (SEM) analysis have shown that t
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2

Macêdo, Gleyguestone Lopes de 1983. "Síntese e caracterização magnética de nanopartículas do tipo dímero de Ag-Fe3O4." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278116.

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Orientador: Kleber Roberto Pirota<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-20T23:05:11Z (GMT). No. of bitstreams: 1 Macedo_GleyguestoneLopesde_M.pdf: 4864713 bytes, checksum: a6eff7f69f1d64274cacac58dc118e5c (MD5) Previous issue date: 2012<br>Resumo: Neste trabalho, seguindo uma nova rota de síntese, foram produzidas três amostras de nanopartículas do tipo dímero de prata com magnetita (Ag-Fe3O4), onde a única diferença entre elas é no valor da concentração de partículas de prata utilizadas na sínt
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3

Arantes, Fabiana Rodrigues. "Sistemas de nanopartículas magnéticas: estudos experimentais e simulações Monte Carlo." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26012015-111206/.

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Nesta tese apresentamos um estudo do comportamento magnético de sistemas de nanopartículas por meio de medidas experimentais e simulações Monte Carlo. Estudamos o papel das interações entre partículas experimentalmente a baixas temperaturas em amostras de ferrofluidos comerciais por meio de curvas ZFC-FC, delta m e diagramas FORC. Observamos nas curvas ZFC-FC o fenômeno de super-resfriamento e transições de fase do estado sólido para o líquido em ferrofluidos. Para amostras de cristais líquidos dopados com nanopartículas magnéticas, observamos a transição entre as fases isotrópica e nemática.
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4

Leon, Vanegas Alvaro Augusto. "Caracterização magnética de nanopartículas de níquel com alto grau de desordem estrutural." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278269.

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Orientador: Marcelo Knobel<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin.<br>Made available in DSpace on 2018-08-12T12:15:41Z (GMT). No. of bitstreams: 1 LeonVanegas_AlvaroAugusto_M.pdf: 1938062 bytes, checksum: c09af0b2555e73ce9f9d903c4094424c (MD5) Previous issue date: 2008<br>Resumo: Neste trabalho estudamos o comportamento magnético de uma amostra de nanopartículas de níquel com alto grau de desordem estrutural com uma distribuição estreita de diâmetros. Encontramos que o sistema apresenta duas fases magnéticas, uma paramagnética, que se
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5

Gadioli, Giovana Zanini 1980. "Efeito magnetocalórico em filmes finos nanocompósitos sintetizados por sputtering." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278297.

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Orientador: Marco Antonio Bica de Moraes<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-06T01:12:05Z (GMT). No. of bitstreams: 1 Gadioli_GiovanaZanini_M.pdf: 816711 bytes, checksum: 5d38a2c08f13049d8af5fd4659ded22e (MD5) Previous issue date: 2006<br>Resumo: As propriedades de filmes obtidos por co-deposição de um material ferromagnético e um não-magnético são objetos de intensa investigação. Neste trabalho, foram investigadas as propriedades de filmes Gdx W1-x, com x variando de 0 a 1. Os filmes foram de
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6

SILVA, Frederico Costa e. "Síntese, Caracterização E Estudo De Propriedades Magnéticas De Ferritas Mistas." Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tde/1042.

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Made available in DSpace on 2014-07-29T15:12:45Z (GMT). No. of bitstreams: 1 Dissertacao Frederico Costa e Silva.pdf: 3291815 bytes, checksum: 2ee5afa45a0edf1283c63ca3496727b8 (MD5) Previous issue date: 2011-04-15<br>The nanoscience and nanotechnology exhibited an outstanding development, which have been caused by the unusual properties featured by materials in the nanometric regime. Because of this, many magnetic materials with sizes smaller than before have been studied; among these materials, the ferrites have been extensively researched in new applications as drug carriers and ferrofluid
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7

Arantes, Fabiana Rodrigues. "Estudo do comportamento magnético de nanopartículas de magnetita e nanofios de níquel diluídos em cristais líquidos liotrópicos." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29062010-112348/.

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Neste trabalho foi feito um estudo do comportamento magnético de cristais líquidos liotrópicos de laurato de potássio dopados com nanopartículas de magnetita. Medidas zero-field cooling (ZFC) e field cooling (FC) com campos de 50 Oe mostram que as nanopartículas magnéticas permanecem bloqueadas a temperatura ambiente devido à presença das micelas do cristal, e apresentam um comportamento superparamagnético quando dispersas somente em água. Simulações Monte Carlo indicam que o aumento da temperatura de bloqueio das nanopartículas imersas em cristais líquidos liotrópicos pode ser obtido consider
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8

Orozco, Henao Juan Manuel 1989. "Efeitos de tamanho e geometria nas propriedades magnéticas e de hipertermia magnética em nanopartículas de Fe3O4." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/305751.

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Orientador: Marcelo Knobel<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-30T18:13:51Z (GMT). No. of bitstreams: 1 OrozcoHenao_JuanManuel_M.pdf: 7687296 bytes, checksum: d9aecf2d118aed0c43ab747d0dcff34c (MD5) Previous issue date: 2016<br>Resumo: Nanopartículas de magnetita com diâmetros entre 5nm e 19nm sintetizadas mediante um método de decomposição térmica são apresentadas. A caracterização estrutural é feita usando diferentes técnicas experimentais como a microscopia eletrônica de transmissão (TEM), d
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9

CAVALCANTI, Paulo José Fonseca. "Nanopartículas magnéticas em meio poroso." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16766.

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Submitted by Isaac Francisco de Souza Dias (isaac.souzadias@ufpe.br) on 2016-04-22T17:52:26Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Paulo José Fonseca Cavalcanti.pdf: 18030085 bytes, checksum: 8d5593dfeb07452bc3bb7b652eafe090 (MD5)<br>Made available in DSpace on 2016-04-22T17:52:26Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) DISSERTAÇÃO Paulo José Fonseca Cavalcanti.pdf: 18030085 bytes, checksum: 8d5593dfeb07452bc3bb7b652eafe090 (MD5) Previous issue date: 2015-07-22<
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Moglia, Fernández Ítalo Arnoldo. "Desarrollo de un material nanoestructurado óptico-magnético utilizando ferritina." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/168285.

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Doctor en Ciencias de la Ingeniería, Mención Ciencia de los Materiales<br>Esta tesis consiste en el uso de la proteína ferritina para la síntesis de nanopartículas plasmónicas y magnéticas en su cavidad, estudiándose el efecto de las condiciones de síntesis de estos materiales sobre las propiedades ópticas, magnéticas y estructurales del sistema resultante. El trabajo está dividido en cinco etapas: i) El estudio de la proteína ferritina como material de partida, ii) la formación de apoferritina, iii) la síntesis de nanoestructuras de oro en la cavidad de la proteína, iv) la formación de óxid
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11

Silva, Cesar Rogerio Menezes. "Estudo da s?ntese e propriedade magn?tica de ferritas de mangan?s/cobalto dopadas com n?quel." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12830.

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Made available in DSpace on 2014-12-17T14:07:16Z (GMT). No. of bitstreams: 1 CesarRMS_TESE.pdf: 4847104 bytes, checksum: d7b76254ab621fe30c0fe75fd8680501 (MD5) Previous issue date: 2013-06-18<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>For the chemical method of synthesis of co-precipitation were produced ferrite powders manganese-cobalt equal stoichiometric formula Mn (1-x) Co (x) Fe2O4, for 0 < x < 1, first reagent element using as the hydroxide ammonium and second time using sodium hydroxide. The obtained powders were calcined at 400 ? C, 650 ? C, 900 ? C and 1150 ?
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12

Fischer, Giovana Zanini Gadioli 1980. "Propriedades magnéticas de filmes multicamadas Gd/W e Gd/Cr depositados por sputtering." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278273.

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Orientador: Marco Antonio Bica de Moraes<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-18T19:35:50Z (GMT). No. of bitstreams: 1 Fischer_GiovanaZaniniGadioli_D.pdf: 32265979 bytes, checksum: f410dfb24adff86c43498027515957c8 (MD5) Previous issue date: 2011<br>Resumo: Neste trabalho, a técnica de magnetron-sputtering foi empregada para fabricar filmes multicamadas de Gd/W e Gd/Cr, cujas propriedades magnéticas foram investigadas em função da espessura das camadas de Gd, dGd, e da temperatura do substrato, TS, du
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13

Perecin, Caio José. "Nanopartículas superparamagnéticas encapsuladas com polímeros para tratamento de câncer por hipertermia." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-22062016-103823/.

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O câncer é uma das maiores causas de mortalidade no Brasil e no mundo, com potencial de crescimento nas próximas décadas. Um tipo de tratamento promissor é a hipertermia magnética, procedimento no qual as células tumorais morrem pelo efeito do calor gerado por partículas magnéticas após a aplicação de campo magnético alternado em frequências adequadas. Tais partículas também são capazes de atuar como agentes de contraste para imageamento por ressonância magnética, um poderoso método de diagnóstico para identificação de células neoplásicas, formando a combinação conhecida como theranostics (ter
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14

Amorim, Bruno Ferreira. "S?ntese e caracteriza??o estrutural e magn?tica da ferrita de c?lcio." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18594.

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Made available in DSpace on 2015-03-03T15:15:26Z (GMT). No. of bitstreams: 1 BrunoFA_DISSERT.pdf: 1242758 bytes, checksum: 3fd41c76d37384c7bc0008cfd31e4a64 (MD5) Previous issue date: 2011-08-05<br>Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico<br>The calcium ferrite (Ca2Fe2O5) has a perovskite-type structure with oxygen deficiency and is used as a chemical catalyst. With the advent of nanoscience and nanotechnology, methods of preparation, physical and chemical characterizations, and the technological applications of nanoparticles have attracted great scientific interest.
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Camilo, Ruth Luqueze. ""Síntese e caracterização de nanopartículas magnéticas de ferrita de cobalto recobertas por 3-aminopropiltrietoxissilano para uso como material híbrido em nanotecnologia"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-27092006-135110/.

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Atualmente com o advento da nanociência e nanotecnologia, as nanopartículas magnéticas têm encontrado inúmeras aplicações nos campos da biomedicina, diagnóstico, biologia molecular, bioquímica, catálise, etc. As nanopartículas magnéticas funcionalizadas são constituídas de um núcleo magnético, envolvido por uma camada polimérica com sítios ativos, que podem ancorar metais ou compostos orgânicos seletivos. Estas nanopartículas são consideradas materiais híbridos orgânico-inorgânicos de grande interesse em aplicações comerciais devido à particularidade das propriedades obtidas. Entre as aplicaçõ
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16

Unibosi, Marco. "Studio delle proprieta magnetiche del sistema nanogranulare magnetite/idrossiapatite per potenziali applicazioni in nanomedicina." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8349/.

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Abbiamo sintetizzato un nuovo sistema nanogranulare consistente di nanoparticelle di magnetite inserite in idrossiapatite carbonata biomimetica per possibili future prospettive nell'ambito del tissue engineering osseo. Sono stati sintetizzati e studiati tre campioni nanogranulari, uno composto di nanoparticelle di magnetite e due composti di idrossiapatite contenenti magnetite per circa lo 0.8wt.% ed il 4wt.%. Le nanoparticelle di magnetite e il materiale composto sono stati analizzati tramite diffrazione a raggi X (XRD), spettroscopia all'infrarosso (FT-IR) e microscopia in trasmissione
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TAMISARI, Melissa. "Spin-dependent scattering of the conduction electrons in nanogranular Fe-Ag films." Doctoral thesis, Università degli studi di Ferrara, 2009. http://hdl.handle.net/11392/2389148.

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The magnetoresistance (MR) is the change of resistance of a conductor when it is placed in an external magnetic field. It is a research argument from a lot of time, both for the information of structural character and compositional deduced from it, but also thanks to the possibility to use such effect for the preparation of sensors of magnetic field. The new phenomenon of GMR (giant magnetoresistance) is notable variations of resistance in correspondence with small applied magnetic fields that al¬lows to produce devices displaying a great versatility. Otherwise from the ordinary and anisotropy
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Junior, João Batista Souza. "Síntese de nanoestruturas core/shell de Co/Au magnetoplasmônica e pontos quânticos de CdSe/ZnS." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-28072017-170738/.

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Nanomateriais apresentam propriedades ajust&aacute;veis pelo seu tamanho e forma, como o fen&ocirc;meno de superparamagnetismo em nanopart&iacute;culas magn&eacute;ticas ou o confinamento qu&acirc;ntico dos portadores de carga em pontos qu&acirc;nticos (quantum dots). Assim, a s&iacute;ntese de nanopart&iacute;culas esf&eacute;ricas monodispersas torna-se um fator extremamente importante, haja visto que tais propriedades podem ser ajust&aacute;veis para diferentes aplica&ccedil;&otilde;es na &aacute;rea de tecnologia e biomedicina. Nanopart&iacute;culas magn&eacute;ticas e quantum dots podem s
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19

Vieira, Ernanni Damião. "Ressonância magnética eletrônica no estudo de sistemas de interesse biológico." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-05072009-135902/.

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Neste trabalho de tese aplicamos a espectroscopia de Ressonância Paramagnética Eletrônica (RPE) junto com a chamada técnica do grupo repórter, aliada a simulação espectral por meio do programa NLSL, para investigar a interação da nicotina dependente com membranas. Também empregamos Ressonância Ferromangnética (RFM), que é uma técnica similar em muitos aspectos ao RPE, para investigamos células-tronco marcadas com nanopartículas superparamagnéticas de óxido de ferro (NSOF), previamente preparada no laboratório de nanotecnologia do Instituto Israelita de Ensino e Pesquisa Albert Einstein (IIEPAE
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Oliveira, Lia Silva de. "O sistema ferro-carbono em alta pressão e a transição grafite-diamante." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1991. http://hdl.handle.net/10183/86493.

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O sistema ferro-carbono é investigado sob alta pressão em duas regiões de concentração representativas. Inicialmente uma alta dose de carbono (3,8 x 1017 íons/cm² ) é implantada em ferro metálico, à temperatura. ambiente. As amostras foram submetidas a tratamentos térmicos até 450 °C. A evolução térmica da série de carbonetos de ferro, e-Fe2C, x-Fe5C2 e θ-Fe3C é acompanhada pela técnica de espectroscopia Mössbauer com elétrons de conversão (CEMS). No estágio inicial observou-se a predominância do carboneto e, que evoluiu posteriormente para os carbonetos ﭏ e θ. Os átomos de carbono implantados
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Borges, Roger. "Desenvolvimento de vidros bioativos contendo óxido de ferro sintetizados pelo método sol-gel visando tratamento de câncer por hipertermia." reponame:Repositório Institucional da UFABC, 2018.

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Orientadora: Profa. Dra. Juliana Marchi<br>Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Nanociências e Materiais Avançados, Santo André, 2018.<br>A hipertermia e uma terapia de tratamento de cancer que consiste em aumentar a temperatura do tecido biologico contendo celulas cancerigenas a temperaturas ate 43¿C, a qual afeta as celulas cancerigenas e causa minimos danos a celulas saudaveis. Este trabalho visou sintetizar, pelo metodo sol-gel, vidros bioativos do sistema SiO2-CaO-P2O5 contendo fases magneticas de oxido de ferro a fim de obter um material com
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Duarte, Evandro Luiz. "Síntese e caracterização de nanopartículas baseadas em óxidos de ferro." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-23042009-154316/.

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Nanopartículas magnéticas têm importância para diversas áreas do conhecimento incluindo física, química e biologia. A obtenção de nanomateriais com características e formas definidas é um grande desafio para esta área. Neste trabalho, realizou-se dois processos de síntese em micelas reversas (MRs) e acopladas ao processo sol-gel e diversos métodos de caracterização de nanopartículas de óxidos de ferro. A utilização de micelas reversas como nanoreatores foi empregada com o intuito de se obter nanopartículas com tamanho e distribuição controladas. Caracterizamos as soluções micelares com a técni
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Ricci, Trieste dos Santos Freire. "Um modelo estocástico para a dinâmica do momento magnético de partículas superparamagnéticas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1996. http://hdl.handle.net/10183/49427.

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Propomos um modelo fenomenológico estocástico para a. dinâmica do momento magnético de partículas superparamagnéticas e obtemos sua solução para diversas circunstâncias e por diversos métodos. Inicialmente estuda-se a teoria dos processos estocásticos e do cálculo estocástico, com ênfase em processos markofianos difusivos. Para esta classe de processos, mostramos como usar diretamente as equações de Langevin para obter quantidades fisicamente relevantes como médias sobre um ensemble de realizações. Este método é uma alternativa ao emprego da correspondente equação de Fokker-Planck. Mostra-se c
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Santos, Ilza Tenório Cavalcante. "Caracterização da anisotropia magnetocristalina de sistemas de nanopartículas de magnesioferrita a partir de espectros de ressonância." Universidade Federal de Sergipe, 2016. https://ri.ufs.br/handle/riufs/5382.

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In this work is described a study of the magnetic anisotropy of a magnesioferrite nanoparticle system (MgFe2O4) obtained by precipitation in solid solution of magnesiowüstite [Mg, Fe]O. The anisotropy field was obtained from system’s resonance spectra as measured in the X band. Such spectra can be considered as composed by two spectral lines: A broad line assigned to blocked particles at the measuring temperature and a thin line, which can be attributed to unlocked (superparamagnetic) particles. The anisotropy field of four samples treated at 700 °C during different annealing times were obtain
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Arnscheidt, Elke. "Untersuchung der elastischen und magnetischen Eigenschaften von CoMn-Legierungen mit Ultraschall." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971701172.

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CAMILO, RUTH L. "Síntese e caracterização de nanopartículas magnéticas de ferrita de cobalto recobertas por 3-aminopropiltrietoxissilano para uso como material híbrido em nanotecnologia." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11436.

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Made available in DSpace on 2014-10-09T12:51:54Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:44Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Perea, Saavedra Héctor. "Magnetic vascular engineering development and validation." Aachen Shaker, 2008. http://d-nb.info/990501124/04.

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Domenici, V., S. Dolci, G. Pampaloni, and Z. Jaglicic. "New Ultra Small Iron-Oxide Nanoparticles with Titanium-Carbamate Coating: Preparation and Magnetic Properties." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35456.

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This work deals with the preparation and chemical characterization of new Ultra-Small Iron-Oxide Superparamagnetic Nanoparticles (USPIONs) functionalized with Titanium-carbamate. The synthesis was performed starting from oleate-coated and 2-pyrrolidone-coated USPIONs having a maghemite ( -Fe2O3) and magnetite (Fe3O4) crystalline core, respectively. Zero-field-cooled (ZFC) and field-cooled (FC) magnetic susceptibility curves as well as the magnetization behavior as a function of temperature are reported and discussed in view of the superparamagnetic properties and coating effect of these n
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He, Zhixing. "Self-assembly of anisotropic nanostructures and interferometric spectroscopy." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97402.

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With the development of controlled and predictable nanoparticle fabrication, assembling multiple nano-objects into larger functional nanostructure has attracted increasing attention. As the most basic structure, assembly of one-dimensional (1D) structures is a good model for investigating the assembly mechanism of a nanostructure's formation from individual particles. In this dissertation, the dynamics and the growth mechanism of anisotropic 1D nanostructures is investigated. In our first study, we demonstrate a simple method for assembling superparamagnetic nanoparticles (SPIONs) into structu
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Ghosh, Suvojit. "Self-assembly of magnetic nanoparticles: A tool for building at the nanoscale." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/54539.

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Nanoparticles can be used as building blocks of materials. Properties of such materials depend on the organization of the constituent particles. Thus, control over particle organization enables control over material properties. However, robust and scalable methods for arranging nanoparticles are still lacking. This dissertation explores the use of an externally applied magnetic field to organize magnetic nanoparticles into microstructures of desired shape. It extends to proofs of concept towards applications in material design and tissue engineering. First, external control over dipolar self-a
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Geißler, David. "Plastizität, deformationsinduzierte Phänomene und Élinvareigenschaften in antiferromagnetischen austenitischen FeMnNiCr-Basislegierungen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-89042.

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Hoch manganhaltige Eisenbasislegierungen sind bei Raumtemperatur austenitisch und antiferromagnetisch (afm). Dabei besteht die Besonderheit, dass sich durch Legierung die afm Übergangstemperatur (Néeltemperatur) so einstellen lässt, dass sie nahe Raumtemperatur liegt. FeMn-Basislegierungen zeigen in Abhängigkeit von der Zusammensetzung Transformation Induced Plasticity (TRIP) und/oder Twinning Induced Plasticity (TWIP), d.h. die niedrige Stapelfehlerenergie dieser Legierungen führt zu verformungsinduzierter, metastabiler Phasenbildung (TRIP) bzw. zur Bildung von Verformungszwillingen (TWIP) un
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Kesserwan, Hasan. "Dynamique d'aimantation ultra-rapide de nanostructures magnétiques." Phd thesis, Université de Strasbourg, 2011. http://tel.archives-ouvertes.fr/tel-00637078.

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Divisé en deux parties, cette thèse décrit la dynamique d'aimantation de nanoparticules magnétiques. Dans la première partie, nous avons décrit une étude expérimentale détaillée de la dynamique d'aimantation dans des nanoparticules de CoPt sous forme de cœur/coquille. Pour cela, nous avons effectué des mesures d'effet Kerr magnéto-optique résolues en temps utilisant une pompe de 150 fs à 400 nm et une sonde de 150 fs à 800 nm. Nous avons étudié les différents processus qui ont lieu sur des échelles de temps bref: comme la démagnétisation ultrarapide et la précession du vecteur d'aimantation. L
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Acarbas, Baltaci Ozge. "Production And Characterization Of Maghemite Nanoparticles." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612488/index.pdf.

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The aim of this study is to produce maghemite nanoparticles by using different production methods. To achieve this purpose Sol-Gel Processing and Microwave Synthesis methods were employed. Suitable characterization techniques like XRD, TEM, BET, and VSM were performed to control the properties of the synthesized particles whether they are suitable for certain applications. In the sol-gel part of the study two different routes were employed to obtain maghemite nanoparticles. In the first route TEOS (tetraethoxysilane) was used as the precursor. Approximate particle sizes of these samples
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Sadat, Md Ehsan. "Probing the Magnetic Relaxation Dynamics and Optical Properties of Superparamagnetic Iron-Oxide (Fe3O4) Nanoparticles for Biomedical Applications." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1447689870.

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35

Bauër, Pierre. "Mesures mécaniques et génération de forces de réseaux d’actine branchés avec des micro-cylindres magnétiques." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066428/document.

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Les travaux effectués dans cette thèse concernent la mécanique des gels d'actine branchés in vitro ainsi que leur processus de génération de forces contre des parois. Pour étudier ces effets, nous avons développé un nouveau montage expérimental, basé sur des mesures via l'auto assemblage de microcylindres superparamagnétiques sous un champ magnétique. Cela nous permet d'en déduire les relations entre force et vitesse des réseaux d'actine branchés, ainsi que de faire le lien entre force et mécanique, des sujets cruciaux en mécanique et en migration cellulaire<br>The work done during this tesis
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36

Morales, Marienette B. "Magnetization Dynamics and Interparticle Interactions in Ferrofluids and Nanostructures." Scholar Commons, 2009. http://scholarcommons.usf.edu/etd/3913.

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Nanoparticle assemblies are of current interest as they are used in a wide variety of industrial and biomedical applications. This work presents two studies aimed at understanding the magnetization dynamics and interparticle interactions in nanoparticle assemblies and various types of ferrofluids. First, we studied the influence of varying strengths of dipolar interaction on the static and dynamic magnetic properties of surfactant-coated monodispersed manganese-zinc ferrite nanoparticles using reversible transverse susceptibility. We tracked the evolution of the anisotropy peaks with varying m
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Thomas, L. V. "Contribution à l'étude de nanostructures magnétiques : du matériau nanocristallisé à l'agrégat." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10232.

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Les nanostructures magnetiques sont a l'interface entre les mondes atomique et macroscopique. L'analyse de leur proprietes peut permettre d'acceder a certaines caracteristiques inherentes a cette echelle mesoscopique, par exemple les effets de surface et de taille finie, ou des manifestations purement quantiques comme l'effet tunnel. Nous presentons l'etude de trois systemes modeles : des couches minces, formees d'empilements compacts d'agregats de fer, cobalt et nickel ; un colloide constitue de particules de cobalt dispersees dans un polymere ; un monocristal moleculaire, mn12-ac, represente
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Murray, Samantha. "I. Attempted synthesis and characterisation of an electron deficient transition metal complex potentially useful in C-H bond activation, II. Investigations of mesoporous niobium oxide-cobaltocene composites : the first example of superparamagnetism in molecule-based clusters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62257.pdf.

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39

Tijiwa, Birk Felipe. "Spin electronics in metallic nanoparticles." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39525.

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The work presented in this thesis shows how tunneling spectroscopy techniques can be applied to metallic nanoparticles to obtain useful information about fundamental physical processes in nanoscopic length scales. At low temperatures, the discrete character of the energy spectrum of these particles, allows the study of spin-polarized current via resolved "electron-in-a-box" energy levels. In samples consisting of two ferromagnetic electrodes tunnel coupled to single aluminum nanoparticles, spin accumulation mechanisms are responsible for the observed spin-polarized current. The observed effect
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40

Cai, Yanping. "Spin and Orbital Moments and Magnetic Order in Fe3O4 Nanoparticle Assemblies." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/3982.

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Fe3O4 magnetic nanoparticles of 5 to 11 nm in size were prepared by organic methods. Particle size was analyzed by both X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM) techniques. Zero Field Cooling (ZFC) / Field Cooling (FC) and magnetization loop measurements were recorded by VSM, and they confirmed superparamagnetic behavior in the sample. The blocking temperature is found to be in the range of 30 K ~ 170 K. It has a dependence on the particle size. ZFC / FC curves also indicate the presence of magnetic coupling between particles. X-ray Magnetic Circular Dichroism (XMCD)
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SOUSA, JOSE S. de. "Funcionalização da superfície de nanopartículas superparamagnéticas encapsuladas por quitosana para a imobilização de proteínas." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10024.

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Made available in DSpace on 2014-10-09T12:33:56Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:58Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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42

Panta, Priscila Chaves. "Obtenção de nanopartículas de óxido de ferro por coprecipitação, sua estabilização com surfactantes e caracterização quanto à morfologia, cristalinidade e comportamento magnético." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/87358.

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Este trabalho investiga a obtenção de nanopartículas (NP) de óxido de ferro por coprecipitação, sua estabilização com surfactantes e caracterização quanto à morfologia e comportamento magnético. Atualmente, as NP estão sendo amplamente utilizadas para aplicações biomédicas, tais como contraste em imagens médicas e sistema de distribuição de drogas. Na síntese das NP foram investigados, parâmetros como a temperatura da reação, o pH da solução e a velocidade de agitação. O estudo da estabilidade comparou dois diferentes surfactantes: o ácido oleico (AO) e o polietileno glicol (PEG). As NP obtida
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43

Prikockis, Michael Vito. "Physics and Applications of Interacting Magnetic Particles: Effect of Patterned Traps." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452073910.

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44

Liong, Silvia. "A Multifunctional Approach to Development, Fabrication, and Characterization of Fe3O4 Composites." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7640.

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A unique approach for lightweight multifunctional composites was developed using Fe3O4 nanoparticles and polypyrrole-coated Fe3O4 particles as fillers. Fe3O4 particles are a good candidate for filler in a multifunctional composite system because they can reinforce mechanical properties of a polymer matrix and impart magnetic properties into a composite. Polypyrrole coating on Fe3O4 particles was utilized to incorporate electrical conductivity to the properties of composites. The effects of filler size and filler content were studied on both the mechanical and electromagnetic properties. Fe
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45

Arredondo, Melissa Gayle. "Zero-Dimensional Magnetite." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14151.

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Low-dimensional magnetic systems are of interest due to several new effects and modifications that occur at sizes below the average domain grain boundary within the bulk material. Molecule-like magnetite (Fe3O4) nanoparticles, with sizes ranging from one to two nm were synthesized and characterized in order to investigate new properties arising from quantum size effects. These small systems will provide opportunities to investigate magnetism of zero-dimension systems. A zero-dimensional object is usually called a quantum dot or artificial atom because its electronic states are few and sharply
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46

Blaire, Guillaume. "Test d'immunodiagnostic innovant combinant nanoparticules superparamagnétiques et micro-aimants." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT116.

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Les micro et nanoparticules magnétiques sont de plus en plus utilisées en biologie et en médecine, pour une large gamme d'applications. Plusieurs applications utilisent le piégeage et le guidage de ces billes sous l'effet d'un champ et d'un gradient de champ magnétique. Dans la plupart des applications, le champ magnétique est macroscopique, créé par un aimant ou un électro-aimant. L'intégration plus poussée est souvent envisagée, dans les articles scientifiques, par des microbobines ou par des éléments magnétiques doux. Ceux-ci doivent alors être polarisés par un champ externe (de nouveau, un
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47

Oyarzún, Medina Simón. "Spintronics in cluster-assembled nanostructures." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10166/document.

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Dans les dernières années, la miniaturisation progressive des dispositifs de stockage magnétique a rendu nécessaire de comprendre comment les propriétés physiques sont modifiées par rapport à l'état massif lorsque les dimensions sont réduites à l'échelle nanométrique. Pour cette raison, une méthode précise de préparation et caractérisation de nanostructures est extrêmement importante. Ce travail se concentre sur les propriétés magnétiques et de transport de nanoparticules de cobalt incorporées dans des matrices de cuivre. Notre dispositif expérimental nous permet de contrôler indépendamment la
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48

Faure, Bertrand. "Particle interactions at the nanoscale : From colloidal processing to self-assembled arrays." Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-79129.

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Nanostructured materials are the next generation of high-performance materials, harnessing the novel properties of their nanosized constituents. The controlled assembly of nanosized particles and the design of the optimal nanostructure require a detailed understanding of particle interactions and robust methods to tune them. This thesis describes innovative approaches to these challenges, relating to the determination of Hamaker constants for iron oxide nanoparticles, the packaging of nanopowders into redispersible granules, the tuning of the wetting behavior of nanocrystals and the simulation
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49

Chien, An-Ting. "Multi-functional PAN based composite fibers." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54304.

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Various nano-fillers can introduce specific functions into polymer and expand their application areas. Myriad properties, such as mechanical, electrical, thermal, or magnetic properties can be combined with original polymer characteristics, including flexible, light weight, and ease of use. These composites can be used to produce multi-functional fibers as the next generation textile or fabrics. In this research, Polyacrylonitrile (PAN) is adopted as the main polymer with different nano-fillers, such as carbon nanotube (CNT), iron oxide nanoparticle, and graphene oxide nanoribbon (GONR). Using
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Song, Qing. "Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7645.

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Size and Shape Controlled Synthesis and Superparamagnetic Properties of Spinel Ferrites Nanocrystals Qing Song 216 pages Directed by Dr. Z. John Zhang The correlationship between magnetic properties and magnetic couplings is established through the investigations of various cubic spinel ferrite nanocrystals. The results of this thesis contribute to the knowledge of size and shape controlled synthesis of various spinel ferrites and core shell architectured nanocrystals as well as the nanomagnetism in spinel ferrites by systematically investigating the effects of spin orbital coupling, mag
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