{"id":84113,"date":"2000-07-04T00:00:00","date_gmt":"2000-07-04T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/estudio-reologico-de-pastas-de-pseudoboehmita-en-el-desarrollo-de-extruidos-de-gamma-alumina\/"},"modified":"2000-07-04T00:00:00","modified_gmt":"2000-07-04T00:00:00","slug":"estudio-reologico-de-pastas-de-pseudoboehmita-en-el-desarrollo-de-extruidos-de-gamma-alumina","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ingenieria-y-tecnologia-quimicas\/estudio-reologico-de-pastas-de-pseudoboehmita-en-el-desarrollo-de-extruidos-de-gamma-alumina\/","title":{"rendered":"Estudio reol\u00f3gico de pastas de pseudoboehmita en el desarrollo de extruidos de gamma-al\u00famina"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Evangelina Atanes S\u00e1nchez <\/strong><\/h2>\n<p>En este trabajo se estudia la reolog\u00eda de pastas de pseudoboehmita, precursoras de soportes catal\u00edticos de y-al\u00famina, en funci\u00f3n de la composici\u00f3n qu\u00edmica. en la caracterizaci\u00f3n reol\u00f3gica se han empleado las t\u00e9cnicas de reometr\u00eda de par de torsi\u00f3n y capilar. A partir de las pastas estudiadas se han obtenido extruidos de y-al\u00famina, y se han caracterizado sus propiedades texturales y mec\u00e1nicas.  la reometr\u00eda de par de torsi\u00f3n se perfila como un m\u00e9todo adecuado para caracterizar los cambios reol\u00f3gicos(viscosidad) que se producen durante el fen\u00f3meno de la peptizaci\u00f3n \u00e1cida de las pastas. Se ha mostrado la existencia de deslizamiento de la pasta en el husillo de transporte de re\u00f3metro capilar. en cuanto a la curva de flujo, en general las pastas han presentado comportamiento no-newtoniano, pseudopl\u00e1stico y con l\u00edmite de flujo. Las caracter\u00edsticas de dispersabilidad de la pseudoboehmita,ph del medio, contenido en s\u00f3lidos y presencia de celulosa como aditivo han mostrado una fuerte influencia sobre la reolog\u00eda(viscosidad y curva de flujo)de las pastas. Se han utilizado los modelos de ostwald, herschel-bulckey y bingham para describir el comportamiento reol\u00f3gico de las pastas. Se ha establecido un intervalo de ph en el que las pastas presentan caracter\u00edsticas adecuadas para su extrusi\u00f3n.  los resultados obtenidos indican que las pastas pueden considerarse como suspensiones coloidales concentradas, donde las fuerzas de interacci\u00f3n superficial determinan en gran medida la reolog\u00eda del medio. La teor\u00eda de estabilidad coloidadl(teor\u00eda dlvo) proporciona una base adecuada para la interpretaci\u00f3n de los resultados reol\u00f3gicos obtenidos, as\u00ed como la consideraci\u00f3n de interacciones hidrodin\u00e1micas entre part\u00edculas.  las caracter\u00edsticas de dispersabilidad de la pseudoboehmita precursora, el ph del medio, contenido en s\u00f3lidos y celulosa determinan las propiedades texturales y mec\u00e1nicas de los extruidos de y-al\u00famina pr<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Estudio reol\u00f3gico de pastas de pseudoboehmita en el desarrollo de extruidos de gamma-al\u00famina<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Estudio reol\u00f3gico de pastas de pseudoboehmita en el desarrollo de extruidos de gamma-al\u00famina <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Evangelina Atanes S\u00e1nchez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Complutense de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 07\/04\/2000<\/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>Jos\u00e9 Manuel Trejo Menayo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: jos\u00e9 Aracil mira <\/li>\n<li> G\u00f3mez mart\u00edn Juan  pedro (vocal)<\/li>\n<li>Juan  ram\u00f3n Gonz\u00e1lez velasco (vocal)<\/li>\n<li>Ana M\u00aa Bahamonde santos (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Evangelina Atanes S\u00e1nchez En este trabajo se estudia la reolog\u00eda de pastas de pseudoboehmita, precursoras de soportes [&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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