{"id":933,"date":"2022-04-27T13:37:02","date_gmt":"2022-04-27T16:37:02","guid":{"rendered":"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/?page_id=933"},"modified":"2022-05-05T10:32:23","modified_gmt":"2022-05-05T13:32:23","slug":"lmev-servicos","status":"publish","type":"page","link":"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/lmev-servicos\/","title":{"rendered":"LMEV &#8211; Servi\u00e7os"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Em um microsc\u00f3pio eletr\u00f4nico de varredura (SEM) os el\u00e9trons s\u00e3o usados para a gera\u00e7\u00e3o de imagens de maneira semelhante \u00e0 que os microsc\u00f3pios de luz usam a luz vis\u00edvel. A resolu\u00e7\u00e3o ideal de um instrumento de imagem depende principalmente do comprimento de onda do meio. Como o comprimento de onda dos el\u00e9trons \u00e9 muito menor que o comprimento de onda da luz, a resolu\u00e7\u00e3o de um microsc\u00f3pio eletr\u00f4nico \u00e9 superior \u00e0 de um microsc\u00f3pio \u00f3ptico. Na verdade, geralmente \u00e9 mais de 1.000 vezes melhor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neste tipo de microsc\u00f3pio eletr\u00f4nico, o feixe de el\u00e9trons varre a amostra em um padr\u00e3o raster. Os el\u00e9trons s\u00e3o gerados no topo da coluna pela fonte de el\u00e9trons. Estes s\u00e3o emitidos quando sua energia t\u00e9rmica supera a fun\u00e7\u00e3o trabalho do material de origem. Eles s\u00e3o ent\u00e3o acelerados e atra\u00eddos pelo \u00e2nodo carregado positivamente. Voc\u00ea pode encontrar uma descri\u00e7\u00e3o mais detalhada dos diferentes tipos de fontes de el\u00e9trons e suas caracter\u00edsticas neste guia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O detector EDS (energy dispersive x-ray detector) separa os raios-X caracter\u00edsticos dos diferentes elementos num espectro de energia. O software do sistema EDS \u00e9 utilizado para analisar esse espectro e determinar a abund\u00e2ncia de elementos espec\u00edficos. O EDS pode ser usado para determinar a composi\u00e7\u00e3o qu\u00edmica de materiais em locais de pequenos microns e criar mapas de composi\u00e7\u00e3o elementar de determinada \u00e1rea. As amostras n\u00e3o precisam passar por secagem pelo ponto cr\u00edtico, nem de recobrimento com metais (metaliza\u00e7\u00e3o) ou carbono. No entanto, \u00e9 necess\u00e1ria uma secagem natural para evapora\u00e7\u00e3o de l\u00edquidos, evitando, dentro do poss\u00edvel a deforma\u00e7\u00e3o do material a ser analisado.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-2 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347-1024x682.jpg\" alt=\"\" data-id=\"966\" data-full-url=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347.jpg\" data-link=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/lmev-servicos\/img_8347\/\" class=\"wp-image-966\" srcset=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347-1024x682.jpg 1024w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347-300x200.jpg 300w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347-768x512.jpg 768w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347-1536x1024.jpg 1536w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8347.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"blocks-gallery-item__caption\">LMEV e Desktop<\/figcaption><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333-1024x682.jpg\" alt=\"\" data-id=\"967\" data-full-url=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333.jpg\" data-link=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/lmev-servicos\/img_8333\/\" class=\"wp-image-967\" srcset=\"https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333-1024x682.jpg 1024w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333-300x200.jpg 300w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333-768x512.jpg 768w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333-1536x1024.jpg 1536w, https:\/\/cursos.ufrrj.br\/posgraduacao\/ppgba\/files\/2022\/05\/IMG_8333.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"blocks-gallery-item__caption\">LMEV HITACHI TM-1000<\/figcaption><\/figure><\/li><\/ul><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Em um microsc\u00f3pio eletr\u00f4nico de varredura (SEM) os el\u00e9trons s\u00e3o usados para a gera\u00e7\u00e3o de imagens de maneira semelhante \u00e0 que os [&hellip;]<\/p>\n","protected":false},"author":78,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"class_list":["post-933","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - 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