{"id":1296,"date":"2009-01-21T12:42:46","date_gmt":"2009-01-21T12:42:46","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/2009\/01\/21\/des-nanotubes-d\/"},"modified":"2012-07-12T11:18:15","modified_gmt":"2012-07-12T11:18:15","slug":"des-nanotubes-d","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2009\/01\/21\/des-nanotubes-d\/","title":{"rendered":"Des nanotubes de carbone de plus en plus fins et adapt\u00e9s aux applications"},"content":{"rendered":"<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;<strong><span style=\"font-size: 1.4em\">L<\/span><\/strong>&lsquo;exp\u00e9rience nous apprend qu&rsquo;une r\u00e9sine isolante charg\u00e9e de fibres conductrices va devenir elle m\u00eame conductrice pour une certaine teneur en fibres.&nbsp; Ce pourcentage n\u00e9cessaire de fibres va d\u00e9pendre de la qualit\u00e9 et de l&rsquo;homog\u00e9n\u00e9it\u00e9 du m\u00e9lange r\u00e9alis\u00e9, de la pr\u00e9valence des fibres \u00e0 s&rsquo;attirer entre elles, mais surtout d&rsquo;un facteur de forme de ces fibres d\u00e9termin\u00e9 par le ratio longueur\/ diam\u00e8tre (L\/D) qui va faire varier ce seuil de percolation de plus de 35% pour des sph\u00e8res conductrices, \u00e0 une quinzaine de pourcents pour du carbone fortement divis\u00e9, \u00e0 quelque pourcents pour des nanofibres. Les nanotubes de carbone avec des ratios L\/D sup\u00e9rieurs \u00e0 100 sont de parfaits candidats comme additifs permettant de rendre conducteurs des milieux isolants tout en pr\u00e9servant l&rsquo;essentiel leurs propri\u00e9t\u00e9s m\u00e9caniques (FIG.).<a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/hyperionnanotubepercolation_21.jpg\"><img loading=\"lazy\" decoding=\"async\" height=\"383\" alt=\"Hyperionnanotubepercolation_2\" src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/hyperionnanotubepercolation_2.jpg\" width=\"480\"  \/><\/a> <a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/hyperionnanotubepercolation.jpg\"><\/a><\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Le japonais Showa Denko proposait jusqu&rsquo;\u00e0 pr\u00e9sent une cat\u00e9gorie de nanotubes de carbone: un produit VGCF (vapor growing carbon fiber) de base utilis\u00e9 comme additif, \u00e0 hauteur d&rsquo;un \u00e0 deux pourcents, dans les \u00e9lectrodes n\u00e9gatives d&rsquo;accumulateurs Lithium-Ion (FIG.II). Ce produit de 130 nm de diam\u00e8tre et de 10 microns de longueur (L\/D=77) a \u00e9t\u00e9 tout d&rsquo;abord utilis\u00e9 par Panasonic en 1993, il est maintenant utilis\u00e9 par la plupart des constructeurs d&rsquo;accumulateurs de ce type. Il am\u00e9liore la dur\u00e9e de vie ainsi que les performances \u00e0 fort r\u00e9gime des accumulateurs. Showa Denko en produit dans les 100 tonnes par an. <a href=\"http:\/\/clabedan.typepad.com\/photos\/uncategorized\/2009\/01\/21\/carbonnanotubecyclelifenegative.jpg\"><img loading=\"lazy\" decoding=\"async\" height=\"489\" alt=\"Carbonnanotubecyclelifenegative\" src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/carbonnanotubecyclelifenegative.jpg\" width=\"480\"  \/><\/a> <\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Apr\u00e8s avoir pr\u00e9sent\u00e9 un nouveau produit a ratio L\/D plus \u00e9lev\u00e9, le VGCF-S de 80 nm de diam\u00e8tre, Showa Denko a d\u00e9cid\u00e9 d&rsquo;industrialiser un nouveau produit le <span style=\"color: #000099\"><strong>VGCF-X<\/strong> <\/span>de 15 \u00e0 20 nm de diam\u00e8tre et de 3 microns de longueur, <u>avec un ratio L\/D de 200<\/u>. Ce produit, ajout\u00e9 \u00e0 hauteur de quelques pourcents, est d\u00e9fini pour rendre conductrices les mati\u00e8res plastiques qui sont utilis\u00e9es pour leurs propri\u00e9t\u00e9s antistatiques dans les salles blanches de production de composants \u00e9lectroniques ou les enveloppes de disques durs. Showa Denko va installer une capact\u00e9 de production de 400 tonnes de ces nanotubes par an \u00e0 partir du mois de Mars. <\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; Pour la suite de nouvelles applications dans l&rsquo;automobile sont activement \u00e9tudi\u00e9es, les plastiques conducteurs avec des traitements de surface de types \u00e9lectrochimiques seraient de bons candidats pour l&rsquo;all\u00e8gement des v\u00e9hicules.<\/p>\n<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Showa Denko \u00e0 sign\u00e9 des accords commerciaux et de coop\u00e9ration avec l&rsquo;am\u00e9ricain Hyperion Catalysis qui d\u00e9tient de nombreux brevets d&rsquo;application de ces nanotubes qu&rsquo;il commercialise sous le nom de FIBRIL (FIG.III).<a href=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/carbonnanotubehyperion1.jpg\"><img loading=\"lazy\" decoding=\"async\" height=\"369\" alt=\"Carbonnanotubehyperion\" src=\"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/files\/2012\/07\/carbonnanotubehyperion.jpg\" width=\"480\"  \/><\/a> <\/p>\n<p>Le 21 Janvier 2009.<\/p>\n<p>&#8211;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;L&lsquo;exp\u00e9rience nous apprend qu&rsquo;une r\u00e9sine isolante charg\u00e9e de fibres conductrices va devenir elle m\u00eame conductrice pour une certaine teneur en fibres.&nbsp; Ce pourcentage n\u00e9cessaire de fibres va d\u00e9pendre de la qualit\u00e9 et de l&rsquo;homog\u00e9n\u00e9it\u00e9 du m\u00e9lange r\u00e9alis\u00e9, de la pr\u00e9valence des fibres \u00e0 s&rsquo;attirer entre elles, mais surtout [&hellip;]<\/p>\n","protected":false},"author":341,"featured_media":11573,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1296","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - 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