{"id":9326,"date":"2017-06-14T19:00:14","date_gmt":"2017-06-14T22:00:14","guid":{"rendered":"http:\/\/scienceblogs.com.br\/hypercubic\/?p=9326"},"modified":"2017-06-14T19:00:14","modified_gmt":"2017-06-14T22:00:14","slug":"entre-o-grafite-e-o-diamante","status":"publish","type":"post","link":"https:\/\/www.blogs.unicamp.br\/hypercubic\/2017\/06\/entre-o-grafite-e-o-diamante\/","title":{"rendered":"Entre o grafite e o diamante"},"content":{"rendered":"<figure style=\"width: 4432px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/0\/0f\/Glassy_carbon_and_a_1cm3_graphite_cube_HP68-79.jpg\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-large\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/0\/0f\/Glassy_carbon_and_a_1cm3_graphite_cube_HP68-79.jpg\" alt=\"Um grande peda\u00e7o de carbono v\u00edtreo ao lado de uma amostra de 1 cm3 de grafite. [Imagem: Alchemist-hp\/Wikipedia]\" width=\"4432\" height=\"3674\" \/><\/a><figcaption class=\"wp-caption-text\">Um grande peda\u00e7o de carbono v\u00edtreo ao lado de uma amostra de 1 cent\u00edmetro c\u00fabico\u00a0de grafite. [Imagem: Alchemist-hp\/Wikipedia]<\/figcaption><\/figure>\n<h4 style=\"text-align: justify\">Durante anos, os cientistas tentaram criar uma forma intermedi\u00e1ria entre as duas estruturas naturais do carbono \u2014 o grafite e o diamante. E agora finalmente conseguiram.<\/h4>\n<p style=\"text-align: justify\">Embora n\u00e3o seja o elemento mais comum do planeta (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Abundance_of_elements_in_Earth%27s_crust\">\u00e9 apenas o 15\u00ba<\/a>), o carbono \u00e9 sem d\u00favida o mais vers\u00e1til. Na atmosfera, forma compostos simples por\u00e9m capazes de alterar o clima de todo o mundo. Na superf\u00edcie, forma todos os organismos vivos nas mais variadas estruturas: c\u00f3digos gen\u00e9ticos, prote\u00ednas, \u00f3rg\u00e3os e tecidos. Nas profundezas do subsolo pode se estruturar de maneira mais s\u00f3lida \u2014 como o <del>inquebr\u00e1vel<\/del>\u00a0dur\u00edssimo diamante \u2014 ou mais fr\u00e1gil \u2014 como o quebradi\u00e7o grafite. Nos laborat\u00f3rios, os cientistas v\u00eam explorando as possibilidades infinitas do carbono das mais diversas maneiras: da s\u00edntese de medicamentos a estruturas carb\u00f4nicas completamente inexistentes na natureza, como o grafeno.<\/p>\n<p style=\"text-align: justify\">Outra coisa que n\u00e3o existe naturalmente \u00e9 algo intermedi\u00e1rio entre o diamante e o grafite. Uma subst\u00e2ncia assim \u2014 conhecida como carbono v\u00edtreo \u2014 poderia ser dura feito pedra mas tamb\u00e9m bastante el\u00e1stica. Seria bastante \u00fatil, por exemplo, para resistir \u00e0s condi\u00e7\u00f5es mais extremas de lubrifica\u00e7\u00e3o ou amortecimento. Apesar dessa forma de carbono ser conhecida\u00a0desde os anos 1950,\u00a0a s\u00edntese controlada de um carbono v\u00edtreo exatamente entre o grafite e o diamante vem sendo tentada h\u00e1 anos em laborat\u00f3rios de todo o mundo, com as mais variadas t\u00e9cnicas.<\/p>\n<p style=\"text-align: justify\">Na chamada compress\u00e3o fria, o carbono \u00e9 submetido a altas press\u00f5es em temperatura ambiente. Na compress\u00e3o quente, a press\u00e3o intensa \u00e9 acompanhada de altas temperaturas. No entanto, o carbono v\u00edtreo formado a frio n\u00e3o mant\u00e9m sua forma quando a press\u00e3o e liberada. Quando \u00e9 usada a compress\u00e3o quente o resultado \u00e9 a forma\u00e7\u00e3o de nanodiamantes cristalinos.<\/p>\n<p style=\"text-align: justify\">Encontrar uma t\u00e9cnica intermedi\u00e1ria que resulte em uma subst\u00e2ncia igualmente intermedi\u00e1ria tem sido frustrante mas isso n\u00e3o significa que os qu\u00edmicos desistiram. Liderada por Zhisheng Zhao, uma equipe de pesquisadores das Universidades Yanshan (China) e Carnegie (EUA) parece ter encontrado o caminho certo para a produ\u00e7\u00e3o do carbono v\u00edtreo. A estrutura-base do carbono v\u00edtreo, parcialmente desordenada, foi submetida a uma press\u00e3o equivalente a 250 mil atmosferas e aquecida a cerca de 980 graus Celsius.<\/p>\n<figure style=\"width: 1500px\" class=\"wp-caption alignnone\"><img decoding=\"async\" class=\"size-large\" src=\"https:\/\/3c1703fe8d.site.internapcdn.net\/newman\/gfx\/news\/hires\/2017\/newformofcar.jpg\" alt=\"No carbono v\u00edtreo comprimido produzido pela equipe de Zhao, camadas de grafeno (em preto) podem ser interligadas de diversas formas por n\u00f3dulos diamantinos (em vermelho). [concep\u00e7\u00e3o art\u00edstica de Timothy Strobel]\" width=\"1500\" height=\"550\" \/><figcaption class=\"wp-caption-text\">No carbono v\u00edtreo comprimido produzido pela equipe de Zhao, camadas de grafeno (em preto) podem ser interligadas de diversas formas por n\u00f3dulos diamantinos (em vermelho). [concep\u00e7\u00e3o art\u00edstica de Timothy Strobel]<\/figcaption><\/figure>\n<p style=\"text-align: justify\">Os resultados do experimento foram publicados por Zhao <em>et. al.<\/em> na <em>Science Advances<\/em> e indicam a forma\u00e7\u00e3o de uma estrutura formada tanto por liga\u00e7\u00f5es parecidas com a do grafite (do tipo sp\u00b2) quanto liga\u00e7\u00f5es diamantinas (sp\u00b3). Sob as condi\u00e7\u00f5es corretas de temperatura e press\u00e3o, as camadas desordenadas do carbono v\u00edtreo se curvam, se aproximam e se conectam de v\u00e1rias maneiras. Esse processo cria uma estrutura que n\u00e3o \u00e9 inteiramente cristalina, mas uma organiza\u00e7\u00e3o espacial refor\u00e7ada em escalas nanom\u00e9tricas. Um v\u00eddeo demonstrativo do material pode ser visto <a href=\"https:\/\/legacy.gl.ciw.edu\/static\/users\/tstrobel\/images\/GC\/ComGC.mp4\">aqui<\/a>.<\/p>\n<p style=\"text-align: justify\">Em comunicado divulgado pelo <a href=\"https:\/\/phys.org\/news\/2017-06-carbon-hard-elastic-rubber.html\"><em>Phys.org<\/em><\/a>, Zhao afirma que \u201cmateriais leves com grande for\u00e7a e elasticidade robusta como esse s\u00e3o bastante desej\u00e1veis para aplica\u00e7\u00f5es onde a redu\u00e7\u00e3o de peso \u00e9 da maior import\u00e2ncia, mais at\u00e9 do que o custo do material\u201d. Formado pela Carnegie e atualmente professor em Yanshan, Zhao acredita que a t\u00e9cnica rec\u00e9m-descoberta pode levar \u00e0 s\u00edntese de outras formas de carbono extraordin\u00e1rias e talvez at\u00e9 mesmo uma classe inteiramente nova de materiais \u2014\u00a0tudo escondido entre o diamante e o grafite.<\/p>\n<h4 style=\"text-align: justify\">Refer\u00eancia<\/h4>\n<p style=\"text-align: justify;padding-left: 30px\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" data-rel=\"lightbox-image-1\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" class=\"alignleft size-full wp-image-3123\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" alt=\"rb2_large_gray25\" width=\"70\" height=\"85\" \/><\/a>Meng Hu <em>et. al.<\/em>\u00a0<strong>Compressed glassy carbon: An ultrastrong and elastic interpenetrating graphene network<\/strong> [<em><strong>Carbono v\u00edtreo comprimido: uma rede de grafeno interpenetrante, el\u00e1stica e superforte<\/strong><\/em>]. <em>Science Advances<\/em>, vol. 3, n. 6. 09 de junho de 2017. <a href=\"http:\/\/advances.sciencemag.org\/content\/3\/6\/e1603213\">DOI: 10.1126\/sciadv.1603213<\/a><\/p>\n<div class=\"panel-pane pane-highwire-article-preval\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Durante anos, os cientistas tentaram criar uma forma intermedi\u00e1ria entre as duas estruturas naturais do carbono \u2014 o grafite e o diamante. E agora finalmente conseguiram. Embora n\u00e3o seja o elemento mais comum do planeta (\u00e9 apenas o 15\u00ba), o carbono \u00e9 sem d\u00favida o mais vers\u00e1til. Na atmosfera, forma compostos simples por\u00e9m capazes de [&hellip;]<\/p>\n","protected":false},"author":486,"featured_media":9331,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_monsterinsights_skip_tracking":false,"material-hide-sections":[],"pgc_sgb_lightbox_settings":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[53,86,277,306],"tags":[890,891,1207,1730,1732],"class_list":["post-9326","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciencia","category-divulgacao-cientifica","category-quimica","category-tecnologia","tag-carbono","tag-carbono-vitreo","tag-diamante","tag-grafeno","tag-grafite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Entre o grafite e o diamante - hypercubic<\/title>\n<meta name=\"robots\" content=\"index, follow, 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