{"id":79959,"date":"2018-03-09T23:25:50","date_gmt":"2018-03-09T23:25:50","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/mecanismos-involucrados-en-la-obtencion-de-nanoparticulas-aciculares-de-fe-y-en-su-comportamiento-magnetico\/"},"modified":"2018-03-09T23:25:50","modified_gmt":"2018-03-09T23:25:50","slug":"mecanismos-involucrados-en-la-obtencion-de-nanoparticulas-aciculares-de-fe-y-en-su-comportamiento-magnetico","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/mecanismos-involucrados-en-la-obtencion-de-nanoparticulas-aciculares-de-fe-y-en-su-comportamiento-magnetico\/","title":{"rendered":"Mecanismos involucrados en la obtenci\u00f3n de nanoparticulas aciculares de fe y en su comportamiento magnetico"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Raquel Mendoza Resendez <\/strong><\/h2>\n<p>En esta investigaci\u00f3n se han preparado part\u00edculas de oxido de hierro (hematites) monodispersas con morfolog\u00eda acicular y diferentes relaciones axiales. La t\u00e9cnica utilizada ha sido una hidr\u00f3lisis de sal de hierro (iii) asistida por temperatura. El mecanismo de formaci\u00f3n de estas part\u00edculas es por agregaci\u00f3n de part\u00edculas primarias (2-3mm). Por medio de la t\u00e9cnica de heterocoagulaci\u00f3n las part\u00edculas aciculares de hematites fueron recubiertas de manera homog\u00e9nea con diferentes aditivos (cobalto, aluminio, itrio). Se han analizado el efecto de cada uno de estos aditivos en sus propiedades estructurales y magn\u00e9ticas. Las part\u00edculas de hametites y hematites recubierta se han reducido a part\u00edculas met\u00e1licas de hierro (puras) y hierro-aditivo en una atm\u00f3sfera de hidrogeno a 400\u00c2\u00bac, evaluando el efecto del flujo de hidrogeno, temperatura y tiempo de reducci\u00f3n, las propiedades magn\u00e9ticas de las diferentes part\u00edculas met\u00e1licas vienen determinadas principalmente por la anisotropia de forma y su microestructura. Los resultados indican que son materiales magn\u00e9ticos duros con altas coercitividades (1200 oe) e imanaci\u00f3n de saturaci\u00f3n de 160 emu\/g. Se ha analizado el posible mecanismo de inversi\u00f3n dela imanaci\u00f3n de estos sistemas, determinandose una inversi\u00f3n incoherente.  los resultados experimentales se ajustan mejor al modelo de las cadenas de esferas.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Mecanismos involucrados en la obtenci\u00f3n de nanoparticulas aciculares de fe y en su comportamiento magnetico<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Mecanismos involucrados en la obtenci\u00f3n de nanoparticulas aciculares de fe y en su comportamiento magnetico <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Raquel Mendoza Resendez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 17\/05\/2006<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Carlos Serna Pereda<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Vicent l\u00f3pez Jos\u00e9 Luis <\/li>\n<li>Manuel V\u00e1zquez villalabeitia (vocal)<\/li>\n<li>Manuel Andres verges (vocal)<\/li>\n<li>Manuel Oca\u00f1a jurado (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Raquel Mendoza Resendez En esta investigaci\u00f3n se han preparado part\u00edculas de oxido de hierro (hematites) monodispersas con [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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