{"id":68652,"date":"2018-03-09T23:13:01","date_gmt":"2018-03-09T23:13:01","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudio-de-la-sustitucion-isomorfica-de-ge-en-zeolitas-por-resonancia-magnetica-nuclear-de-solidos\/"},"modified":"2018-03-09T23:13:01","modified_gmt":"2018-03-09T23:13:01","slug":"estudio-de-la-sustitucion-isomorfica-de-ge-en-zeolitas-por-resonancia-magnetica-nuclear-de-solidos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/politecnica-de-valencia\/estudio-de-la-sustitucion-isomorfica-de-ge-en-zeolitas-por-resonancia-magnetica-nuclear-de-solidos\/","title":{"rendered":"Estudio de la sustituci\u00f3n isom\u00f3rfica de ge en zeolitas por resonancia magnetica nuclear de s\u00f3lidos"},"content":{"rendered":"<h2>Tesis doctoral de <strong>  Vidal Moya Jos\u00e9 Alejandro <\/strong><\/h2>\n<p>El fin \u00faltimo de la investigaci\u00f3n en la s\u00edntesis de nuevas zeolitas es la obtenci\u00f3n de materiales con la topolog\u00eda adecuada para una aplicaci\u00f3n espec\u00edfica. Adem\u00e1s del agente org\u00e1nico director de la estructura, es posible dirigir la s\u00edntesis de zeolitas mediante la incorporaci\u00f3n otros \u00e1tomos distintos del si, que formen \u00e1ngulos promedio t-o-t diferentes. En este sentido, se ha observado que los \u00e1ngulos t-o-t en germanatos son m\u00e1s cerrados que en silicatos, y muy pr\u00f3ximos a los de las cajitas formadas por dobles anillos de cuatrom iembros (d4r) en zeolitas. De hecho, la adici\u00f3n de ge al gel de s\u00edntesis de zeolitas que contienen estas unidades, acorta los tiempos de cristalizaci\u00f3n. Estas consideraciones llevan a pesar que los \u00e1tomos de ge deben a incorporarse a las posiciones cristalogr\u00e1ficas que forman los d4r.  en esta tesis doctoral se ha estudiado la distribuci\u00f3n de ge en la red de una serie de zeolitas, itq-7, itq-17, itq-21, itq-13 y octadecasil, que contienen d4r. La s\u00edntesis de estos materiales se ha realizado en presencia de iones fluoruro que se incorporan a los d4r de la zeolita, favoreciendo su formaci\u00f3n y compensando la carga positiva del agente org\u00e1nico. El objetivo final de este trabjo de investigaci\u00f3n es discernir si, efectivamente, el ge ocupa preferentemente las posiciones cristalogr\u00e1ficas que est\u00e1n formando los d4r. Para ello hemos utilizado, fundamentalmente, la resonancia magn\u00e9tica nuclear (rmn) de 29si y de 19f. Este \u00faltimo n\u00facleo act\u00faa como una sonda local que permite determinar la composici\u00f3n, es  decir, el n\u00famero de \u00e1tomos de si y ge, que forman los d4r donde se aloja.  los resultados obtenidos indican que el ge se incorpora a los d4r, estando favorecida la formaci\u00f3n de cajas con determinadas composiciones. De esta manera, a bajos contenidos en ge, se han identificado d4r que contienen uno o tres (cuatro) \u00e1tomos de ge, adem\u00e1s del que s\u00f3lo contiene tetraedros de sio4\/2, observ\u00e1<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio de la sustituci\u00f3n isom\u00f3rfica de ge en zeolitas por resonancia magnetica nuclear de s\u00f3lidos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio de la sustituci\u00f3n isom\u00f3rfica de ge en zeolitas por resonancia magnetica nuclear de s\u00f3lidos <\/li>\n<li><strong>Autor:<\/strong>\u00a0  Vidal Moya Jos\u00e9 Alejandro <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 25\/06\/2004<\/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>Teresa Blasco Lanzuela<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: vicente Forn\u00e9s segu\u00ed <\/li>\n<li> Alba carraza m. dolores (vocal)<\/li>\n<li>hermenegildo Garc\u00eda g\u00f3mez (vocal)<\/li>\n<li> Palomares gimeno Antonio  eduardo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Vidal Moya Jos\u00e9 Alejandro El fin \u00faltimo de la investigaci\u00f3n en la s\u00edntesis de nuevas zeolitas es [&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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