{"id":7292,"date":"2025-01-12T02:48:17","date_gmt":"2025-01-12T02:48:17","guid":{"rendered":"https:\/\/jinsuncarbon.com\/?p=7292"},"modified":"2025-01-12T02:48:17","modified_gmt":"2025-01-12T02:48:17","slug":"is-graphite-magnetic","status":"publish","type":"post","link":"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/","title":{"rendered":"O grafite \u00e9 magn\u00e9tico?"},"content":{"rendered":"<p class=\"ql-align-justify\">Na ci\u00eancia dos materiais, o grafite \u00e9 um <a href=\"https:\/\/jinsuncarbon.com\/pt\/materiais-de-carbono\/\">material de carbono<\/a>A fibra \u00f3ptica \u00e9 um elemento importante na constru\u00e7\u00e3o de um sistema de comunica\u00e7\u00e3o, devido \u00e0 sua estrutura e propriedades especiais. Ele desempenha um papel fundamental em muitos campos, como a escrita e a ind\u00fastria. Entretanto, seu magnetismo \u00e9 frequentemente ignorado e o conhecimento do p\u00fablico \u00e9 vago. A pesquisa sobre o magnetismo e a natureza do grafite n\u00e3o est\u00e1 relacionada apenas ao aprimoramento da teoria b\u00e1sica. Mas tamb\u00e9m tem grande potencial em campos emergentes, como a computa\u00e7\u00e3o qu\u00e2ntica.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabela de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#Is_graphite_magnetic\" title=\"O grafite \u00e9 magn\u00e9tico?\">O grafite \u00e9 magn\u00e9tico?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#Basic_properties_of_graphite\" title=\"Propriedades b\u00e1sicas do grafite\">Propriedades b\u00e1sicas do grafite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#The_nature_of_magnetism\" title=\"A natureza do magnetismo\">A natureza do magnetismo<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#The_diamagnetic_properties_of_graphite\" title=\"As propriedades diamagn\u00e9ticas do grafite\">As propriedades diamagn\u00e9ticas do grafite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#External_factors_affecting_the_graphite_magnetic_properties\" title=\"Fatores externos que afetam as propriedades magn\u00e9ticas do grafite\">Fatores externos que afetam as propriedades magn\u00e9ticas do grafite<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#Is_graphite_oxide_magnetic\" title=\"O \u00f3xido de grafite \u00e9 magn\u00e9tico?\">O \u00f3xido de grafite \u00e9 magn\u00e9tico?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-grafite-e-magnetico\/#Conclusion\" title=\"Conclus\u00e3o\">Conclus\u00e3o<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>&nbsp;<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Is_graphite_magnetic\"><\/span>O grafite \u00e9 magn\u00e9tico?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Basic_properties_of_graphite\"><\/span>Propriedades b\u00e1sicas do grafite<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ql-align-justify\">O cristal de grafite tem uma estrutura t\u00edpica em camadas. E os \u00e1tomos de carbono em cada camada s\u00e3o conectados uns aos outros por liga\u00e7\u00f5es covalentes, formando uma grade hexagonal plana em forma de favo de mel. Os el\u00e9trons podem se mover livremente na camada, o que confere ao grafite boa condutividade el\u00e9trica, semelhante \u00e0s caracter\u00edsticas das liga\u00e7\u00f5es met\u00e1licas. A camada e a camada s\u00e3o mantidas pela fraca for\u00e7a de van der Waals, e a dist\u00e2ncia \u00e9 grande. Macroscopicamente, o grafite tem textura macia, brilho met\u00e1lico, propriedades qu\u00edmicas relativamente est\u00e1veis e resist\u00eancia a altas temperaturas. A resist\u00eancia a uma variedade de eros\u00e3o \u00e1cida e alcalina, a estrutura e as propriedades exclusivas s\u00e3o a base para a explora\u00e7\u00e3o de seu magnetismo.<\/p>\n<h3 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"The_nature_of_magnetism\"><\/span>A natureza do magnetismo<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p class=\"ql-align-justify\">O magnetismo vem do movimento e do giro dos el\u00e9trons dentro dos \u00e1tomos. O momento magn\u00e9tico orbital dos el\u00e9trons que orbitam o n\u00facleo \u00e9 como uma corrente em anel em miniatura. O pr\u00f3prio el\u00e9tron tamb\u00e9m tem um momento magn\u00e9tico de spin, semelhante ao spin de um pi\u00e3o min\u00fasculo. Na maioria dos materiais, a intera\u00e7\u00e3o dos momentos magn\u00e9ticos at\u00f4micos \u00e9 complexa. Se os momentos magn\u00e9ticos at\u00f4micos se alinharem espontaneamente na mesma dire\u00e7\u00e3o dentro de uma determinada faixa, o material exibir\u00e1 ferromagnetismo, como ferro, cobalto e n\u00edquel. Os momentos magn\u00e9ticos de alguns materiais s\u00e3o opostos e paralelos entre si, mas o tamanho \u00e9 diferente. E h\u00e1 momentos magn\u00e9ticos l\u00edquidos, mostrando ferromagnetismo. H\u00e1 tamb\u00e9m alguns materiais com momento magn\u00e9tico at\u00f4mico reverso paralelo e completamente deslocado, macro n\u00e3o magn\u00e9tico, o chamado diamagnetismo. Quando o campo magn\u00e9tico externo, a \u00f3rbita do el\u00e9tron produzir\u00e1 um momento magn\u00e9tico adicional fraco contra o campo externo. Essa \u00e9 a fonte diamagn\u00e9tica.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-7297\" src=\"https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic.jpg\" alt=\"O grafite \u00e9 magn\u00e9tico?\" width=\"676\" height=\"449\" srcset=\"https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic.jpg 1024w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-300x199.jpg 300w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-768x510.jpg 768w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-18x12.jpg 18w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/01\/Is-graphite-magnetic-600x398.jpg 600w\" sizes=\"(max-width: 676px) 100vw, 676px\" \/><\/p>\n<p>&nbsp;<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"The_diamagnetic_properties_of_graphite\"><\/span>As propriedades diamagn\u00e9ticas do grafite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\"><a href=\"https:\/\/jinsuncarbon.com\/pt\/os-usos-do-grafite\/\">Grafite<\/a> s\u00e3o subst\u00e2ncias essencialmente diamagn\u00e9ticas. Na aus\u00eancia de um campo magn\u00e9tico externo, a soma dos momentos magn\u00e9ticos de cada \u00e1tomo dentro do grafite \u00e9 quase zero. Portanto, ele n\u00e3o apresenta magnetismo em geral. Mas quando um campo magn\u00e9tico \u00e9 aplicado ao mundo externo, de acordo com o princ\u00edpio da indu\u00e7\u00e3o eletromagn\u00e9tica, o estado de movimento dos el\u00e9trons dentro do grafite muda. Para evitar a altera\u00e7\u00e3o do fluxo magn\u00e9tico do campo magn\u00e9tico externo, os el\u00e9trons geram um movimento adicional. Isso, por sua vez, forma um momento magn\u00e9tico de indu\u00e7\u00e3o oposto \u00e0 dire\u00e7\u00e3o do campo magn\u00e9tico externo. Esse momento magn\u00e9tico de indu\u00e7\u00e3o \u00e9 muito fraco, de modo que o desempenho antimagn\u00e9tico do grafite n\u00e3o \u00e9 \u00f3bvio. Sua suscetibilidade magn\u00e9tica \u00e9 geralmente negativa e o valor \u00e9 muito pequeno, da ordem de grandeza de -10<sup>-5<\/sup>.<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"External_factors_affecting_the_graphite_magnetic_properties\"><\/span>Fatores externos que afetam as propriedades magn\u00e9ticas do grafite<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\">A temperatura tem um efeito significativo sobre as propriedades magn\u00e9ticas do grafite. \u00c0 medida que a temperatura aumenta, o movimento t\u00e9rmico dos \u00e1tomos dentro do grafite se intensifica. E esse aumento no movimento t\u00e9rmico interfere no movimento orbital dos el\u00e9trons. Isso, por sua vez, afeta a resposta dos el\u00e9trons ao campo magn\u00e9tico aplicado. Especificamente, \u00e0 medida que a temperatura aumenta, o valor absoluto da suscetibilidade diamagn\u00e9tica do grafite diminui ligeiramente. Mas essa mudan\u00e7a \u00e9 relativamente lenta. E pode-se considerar que o diamagnetismo do grafite permanece relativamente est\u00e1vel em uma determinada faixa de temperatura.<\/p>\n<p class=\"ql-align-justify\">Al\u00e9m da temperatura, a for\u00e7a e a frequ\u00eancia do campo magn\u00e9tico externo tamb\u00e9m afetam as propriedades magn\u00e9ticas do grafite. Quando a intensidade do campo magn\u00e9tico externo \u00e9 fraca, a resposta diamagn\u00e9tica do grafite est\u00e1 basicamente em conformidade com a lei linear. Ou seja, a magnetiza\u00e7\u00e3o \u00e9 proporcional \u00e0 intensidade do campo magn\u00e9tico externo. Entretanto, quando a intensidade do campo magn\u00e9tico externo aumenta at\u00e9 certo ponto, o efeito mec\u00e2nico qu\u00e2ntico come\u00e7a a aparecer. E as propriedades diamagn\u00e9ticas do grafite se desviar\u00e3o gradualmente da rela\u00e7\u00e3o linear, mostrando um comportamento magn\u00e9tico mais complexo. Al\u00e9m disso, para campos magn\u00e9ticos alternados, se a frequ\u00eancia for alta, a velocidade de resposta do <a href=\"https:\/\/en.wikipedia.org\/wiki\/Electron\" target=\"_blank\" rel=\"noopener\">el\u00e9trons<\/a> dentro do grafite pode n\u00e3o ser capaz de acompanhar a mudan\u00e7a no campo magn\u00e9tico. Isso resulta em uma mudan\u00e7a em seu diamagnetismo.<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Is_graphite_oxide_magnetic\"><\/span>O \u00f3xido de grafite \u00e9 magn\u00e9tico?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\"><span class=\"\" data-type=\"2\" data-index=\"1\" data-gid=\"0\"><a href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-oxido-de-grafite\/\">\u00d3xido de grafite<\/a> \u00e9 um derivado de grafite obtido pela oxida\u00e7\u00e3o do grafite.<\/span>\u00a0Durante o processo de oxida\u00e7\u00e3o, um grande n\u00famero de grupos funcionais contendo oxig\u00eanio, como <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hydroxy_group\" target=\"_blank\" rel=\"noopener\">hidroxila<\/a>Os grupos de grafite, carboxila e ep\u00f3xi s\u00e3o introduzidos na estrutura do grafite.\u00a0<span class=\"\" data-type=\"2\" data-index=\"3\" data-gid=\"1\">A exist\u00eancia desses grupos funcionais contendo oxig\u00eanio altera muito a estrutura original da camada de grafite.<\/span>\u00a0Isso aumenta o espa\u00e7amento entre as camadas e destr\u00f3i o sistema original de conjuga\u00e7\u00e3o de el\u00e9trons do grafite. Isso resulta em uma diminui\u00e7\u00e3o significativa de sua condutividade el\u00e9trica.<\/p>\n<p class=\"ql-align-justify\">Em termos de magnetismo, devido \u00e0 exist\u00eancia de el\u00e9trons desemparelhados nos grupos funcionais contendo oxig\u00eanio introduzidos no processo de oxida\u00e7\u00e3o. Esses el\u00e9trons desemparelhados t\u00eam um momento magn\u00e9tico de spin, fazendo com que o \u00f3xido de grafite tenha um certo paramagnetismo.\u00a0<span data-type=\"2\" data-index=\"5\" data-gid=\"2\">Quando o grau de oxida\u00e7\u00e3o \u00e9 baixo, o \u00f3xido de grafite ainda ret\u00e9m algumas das propriedades diamagn\u00e9ticas originais do grafite.<\/span>\u00a0Nesse momento, o paramagnetismo e o diamagnetismo competem entre si, e o desempenho magn\u00e9tico macrosc\u00f3pico n\u00e3o \u00e9 \u00f3bvio. Entretanto, com o aprofundamento do grau de oxida\u00e7\u00e3o, o sinal paramagn\u00e9tico \u00e9 gradualmente aprimorado. E quando ele ultrapassa um determinado limite, o paramagnetismo predomina, fazendo com que o \u00f3xido de grafite como um todo apresente paramagnetismo. E sua suscetibilidade magn\u00e9tica se torna positiva.<\/p>\n<h2 class=\"ql-align-justify\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclus\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ql-align-justify\">O grafite \u00e9 uma subst\u00e2ncia diamagn\u00e9tica, e seu diamagnetismo \u00e9 gerado pelo momento magn\u00e9tico induzido por el\u00e9trons sob o campo magn\u00e9tico externo. Ele \u00e9 de grande import\u00e2ncia em um cen\u00e1rio espec\u00edfico. O \u00f3xido de grafite \u00e9 paramagn\u00e9tico porque cont\u00e9m el\u00e9trons desemparelhados, e o magnetismo varia de acordo com o grau de oxida\u00e7\u00e3o. Uma pesquisa aprofundada sobre o magnetismo dos dois conduz ao aprimoramento da teoria, promovendo aplica\u00e7\u00f5es inovadoras. E ajuda no desenvolvimento de novos materiais e tecnologias.<\/p>","protected":false},"excerpt":{"rendered":"<p>Na ci\u00eancia dos materiais, o grafite \u00e9 um material de carbono exclusivo, devido \u00e0 sua estrutura e propriedades especiais. Ele desempenha um papel fundamental em muitos campos, como a escrita e a ind\u00fastria. Entretanto, seu magnetismo \u00e9 frequentemente ignorado e o conhecimento do p\u00fablico \u00e9 vago. A pesquisa sobre o magnetismo e a natureza do grafite n\u00e3o est\u00e1 relacionada apenas a [...]<\/p>","protected":false},"author":3,"featured_media":7297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7292","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-carbon-graphite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.2.1 (Yoast SEO v24.8.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Is Graphite Magnetic ? | Jinsun Carbon<\/title>\n<meta name=\"description\" content=\"Is graphite magnetic? No, it isn\u2019t. The electron configuration of the carbon atoms inside it does not produce a net magnetic moment. And there are no unpaired electrons to produce magnetism. 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No, it isn\u2019t. The electron configuration of the carbon atoms inside it does not produce a net magnetic moment. And there are no unpaired electrons to produce magnetism. 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