{"id":486819,"date":"2025-10-13T19:54:07","date_gmt":"2025-10-13T17:54:07","guid":{"rendered":"https:\/\/www.eenewseurope.com\/?p=486819"},"modified":"2025-10-14T11:27:28","modified_gmt":"2025-10-14T09:27:28","slug":"des-circuits-imprimes-biodegradables-en-bois-pour-une-electronique-plusverte","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/des-circuits-imprimes-biodegradables-en-bois-pour-une-electronique-plusverte\/","title":{"rendered":"Des circuits imprim\u00e9s biod\u00e9gradables en bois pour une \u00e9lectronique plus verte"},"content":{"rendered":"<h3><span style=\"font-size: 16px;\">Les circuits imprim\u00e9s actuels ne sont gu\u00e8re recyclables. \u00a0Dans le cadre du projet de recherche de l&rsquo;UE \u00ab HyPELignum, des chercheurs de l&rsquo;Empa en Suisse ont d\u00e9velopp\u00e9 une variante biod\u00e9gradable avec leur biomat\u00e9riau enti\u00e8rement bas\u00e9 sur le bois. Ce biomat\u00e9riau peut \u00eatre transform\u00e9 en circuits imprim\u00e9s fonctionnels pour des appareils \u00e9lectroniques, de l&rsquo;ordinateur portable \u00e0 la brosse \u00e0 dent. Un pas important vers l&rsquo;\u00e9lectronique durable.<\/span><\/h3>\n<p><strong>Une \u00ab dream team \u00bb de fibrilles et de lignine<\/strong><\/p>\n<div class=\"std-art-paragraph \">\n<p>Thomas Geiger \u00a0du laboratoire Cellulose and Wood Materials explique :\u00abLe mat\u00e9riau de base du support est un m\u00e9lange naturel de cellulose et d&rsquo;un peu de lignine. Au sens strict, il s&rsquo;agit d&rsquo;un d\u00e9chet. \u00ab Nos partenaires de l&rsquo;institut de recherche TNO aux Pays-Bas ont mis au point un proc\u00e9d\u00e9 permettant d&rsquo;extraire les mati\u00e8res premi\u00e8res lignine et h\u00e9micellulose du bois. \u00a0Ce qui reste, c&rsquo;est la lignocellulose brun\u00e2tre, pour laquelle il n&rsquo;y avait jusqu&rsquo;\u00e0 pr\u00e9sent aucune utilisation \u00bb. Thomas Geiger, qui fait depuis longtemps des recherches sur l&rsquo;\u00e9lectronique \u00e0 base de cellulose, a vu le potentiel de cette mati\u00e8re premi\u00e8re. Pour que la lignocellulose puisse devenir un produit high-tech tel qu&rsquo;un circuit imprim\u00e9, elle doit d&rsquo;abord \u00eatre broy\u00e9e avec un ajout d&rsquo;eau afin de d\u00e9composer les fibres de cellulose relativement \u00e9paisses en fines fibrilles de cellulose. Il en r\u00e9sulte un fin r\u00e9seau de fibrilles tr\u00e8s fines qui sont reli\u00e9es entre elles. L&rsquo;\u00e9tape suivante consiste \u00e0 extraire l&rsquo;eau de la masse \u00e0 haute pression. Les fibrilles se rapprochent les unes des autres et s\u00e8chent pour former une masse solide. Les chercheurs appellent ce processus \u00ab cornification \u00bb. \u00ab La lignine contenue sert de liant suppl\u00e9mentaire dans la masse \u00bb.<\/p>\n<p><strong>Les limites<\/strong><\/p>\n<p>La plaque cornifi\u00e9e ainsi obtenue est \u00ab\u00a0presque\u00a0\u00bb aussi r\u00e9sistante qu&rsquo;une plaque de circuit imprim\u00e9 conventionnelle compos\u00e9e de fibres de verre et d&rsquo;\u00e9poxy. \u00ab\u00a0Presque\u00a0\u00bb car ce panneau compostable est encore sensible \u00e0 l&rsquo;eau et \u00e0 une forte humidit\u00e9. Mais l&rsquo;eau est n\u00e9cessaire, car \u00ab si l&rsquo;eau ne peut plus du tout p\u00e9n\u00e9trer dans le mat\u00e9riau de support, les micro-organismes, comme les champignons, ne peuvent plus y pousser \u2013 et la biod\u00e9gradabilit\u00e9 ne serait donc plus assur\u00e9e \u00bb, explique Thomas Geiger.<\/p>\n<p>Les chercheurs sont n\u00e9anmoins confiants dans le fait que la r\u00e9sistance du biomat\u00e9riau lignocellulosique peut encore \u00eatre am\u00e9lior\u00e9e avec un traitement ad\u00e9quat. Pour certaines applications, nous devons toutefois aussi repenser notre rapport \u00e0 l&rsquo;\u00e9lectronique. De nombreux appareils \u00e9lectroniques ne sont utilis\u00e9s que quelques ann\u00e9es avant de devenir obsol\u00e8tes \u2013 il n&rsquo;est donc pas forc\u00e9ment judicieux de les fabriquer \u00e0 partir de mat\u00e9riaux qui peuvent durer des centaines d&rsquo;ann\u00e9es \u00bb.<\/p>\n<p><strong>EMPA<\/strong><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Les circuits imprim\u00e9s actuels ne sont gu\u00e8re recyclables. \u00a0Dans le cadre du projet de recherche de l&rsquo;UE \u00ab HyPELignum, des chercheurs de l&rsquo;Empa en Suisse ont d\u00e9velopp\u00e9 une variante biod\u00e9gradable avec leur biomat\u00e9riau enti\u00e8rement bas\u00e9 sur le bois. Ce biomat\u00e9riau peut \u00eatre transform\u00e9 en circuits imprim\u00e9s fonctionnels pour des appareils \u00e9lectroniques, de l&rsquo;ordinateur portable \u00e0 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":486823,"comment_status":"closed","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[5135,10630,10629],"domains":[47],"ppma_author":[1143],"class_list":["post-486819","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-circuit-imprime","tag-empa-fr","tag-materiau-biodegradable","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Des circuits imprim\u00e9s biod\u00e9gradables en bois pour une \u00e9lectr...<\/title>\n<meta name=\"description\" content=\"Des circuits imprim\u00e9s biod\u00e9gradables en bois. 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