{"id":26591,"date":"2018-03-09T09:18:29","date_gmt":"2018-03-09T09:18:29","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/propiedades-magneticas-de-nanoparta%c2%adculas-de-coag-preparadas-mediante-la-tecnica-de-microemulsiones\/"},"modified":"2018-03-09T09:18:29","modified_gmt":"2018-03-09T09:18:29","slug":"propiedades-magneticas-de-nanoparta%c2%adculas-de-coag-preparadas-mediante-la-tecnica-de-microemulsiones","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/santiago-de-compostela\/propiedades-magneticas-de-nanoparta%c2%adculas-de-coag-preparadas-mediante-la-tecnica-de-microemulsiones\/","title":{"rendered":"Propiedades magn\u00e9ticas de nanopart\u00edculas de coag preparadas mediante la t\u00e9cnica de microemulsiones"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Garc\u00eda Bastida Antonio  Jes\u00fas <\/strong><\/h2>\n<p>Un m\u00e9todo basado en reacciones sucesivas en microemulsi\u00f3n es desarrollado fundamentalmente para:  1,- obtener clusters de material magn\u00e9tico (cobalto).  2,- recubrirlo de material no magn\u00e9tico (plata).  t\u00e9cnicas como la microscop\u00eda electr\u00f3nica de transmisi\u00f3n, la difracci\u00f3n y absorci\u00f3n de rayos x (exafs), son empleadas para la caracterizaci\u00f3n estructural de las muestras. Los clusters de cobalto se presentan oxidados (co3o4). tratamientos t\u00e9rmicos a altas temperaturas en atm\u00f3sferas de h2 y ar, provocan la reducci\u00f3n y el crecimiento del cobalto.  se realiza un estudio  te\u00f3rico de las propiedades de los sistemas de part\u00edculas magn\u00e9ticas monodominio, fuera del equilibrio t\u00e9rmico y en estado superparamagn\u00e9tico, as\u00ed c\u00f3mo la evoluci\u00f3n entre ambos tipos de estados.  en cuanto a las medidas magn\u00e9ticas sobre el sistema co@ag han sido realizadas medidas de magnetizaci\u00f3n isoterma frente a campo magn\u00e9tico, medidas de magnetizaci\u00f3n frente a temperatura (destaquemos las curvas \u00abzero field cooling-field cooling\u00bb) y resonancia magn\u00e9tica electr\u00f3nica. Mediante ajustes de las curvas te\u00f3ricas han sido extra\u00eddos par\u00e1metros tales como el momento efectivo at\u00f3mico, la constante de anisotrop\u00eda, el n\u00c2\u00ba de \u00e1tomos de co por cluster y dispersiones de tama\u00f1os. El tratamiento t\u00e9rmico previo influye notablemente en el comportamiento magn\u00e9tico del sistema, y muchas de estas propiedades son analizadas coherentemente en los resultados extra\u00eddos de la caracterizaci\u00f3n estructural. Adem\u00e1s, han sido observados efectos de ligandos sobre la superficie, fluctuaciones de esp\u00edn, importantes contribuciones de los momentos angulares orbitales y cambios en el estado de esp\u00edn del co3+. Las interacciones magn\u00e9ticas entre clusters no pueden ser despreciadas debido a la presencia de m\u00e1s de un cluster por nanopart\u00edcula. Mientras que el tama\u00f1o de dicho cluster viene determinado por la concentraci\u00f3n del i\u00f3n c02+ en la microemulsi\u00f3n original,<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Propiedades magn\u00e9ticas de nanopart\u00edculas de coag preparadas mediante la t\u00e9cnica de microemulsiones<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Propiedades magn\u00e9ticas de nanopart\u00edculas de coag preparadas mediante la t\u00e9cnica de microemulsiones <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Garc\u00eda Bastida Antonio  Jes\u00fas <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Santiago de compostela<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 31\/10\/2003<\/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>Jose Rivas Rey<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: marcos Tejedor gancedo <\/li>\n<li>Juli\u00e1n Mar\u00eda Gonz\u00e1lez est\u00e9vez (vocal)<\/li>\n<li>Mar\u00eda del carmen Blanco varela (vocal)<\/li>\n<li>Carlos Ramos (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Garc\u00eda Bastida Antonio Jes\u00fas Un m\u00e9todo basado en reacciones sucesivas en microemulsi\u00f3n es desarrollado fundamentalmente para: 1,- [&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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