{"id":218548,"date":"2016-03-07T12:13:33","date_gmt":"2016-03-07T12:13:33","guid":{"rendered":"https:\/\/eenewseurope.artwhere.co\/pistes-electriques-deformables-et-etirables\/"},"modified":"2016-03-07T12:13:33","modified_gmt":"2016-03-07T12:13:33","slug":"pistes-electriques-deformables-et-etirables","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/pistes-electriques-deformables-et-etirables\/","title":{"rendered":"Pistes \u00e9lectriques d\u00e9formables et \u00e9tirables"},"content":{"rendered":"<p>Les pistes \u00e9lectriques sont traditionnellement imprim\u00e9es en dur sur des cartes. Celles qui ont \u00e9t\u00e9 d\u00e9velopp\u00e9es \u00e0 l\u2019EPFL sont aussi souples que du caoutchouc et peuvent \u00eatre \u00e9tir\u00e9es jusqu\u2019\u00e0 quatre fois leur longueur d&rsquo;origine dans toutes les directions. Les pistes peuvent \u00eatre \u00e9tir\u00e9es un million de fois sans se fracturer et surtout sans que la conductivit\u00e9 \u00e9lectrique ne soit interrompue. Cette invention fait l\u2019objet d\u2019une publication dans la revue&nbsp;<em>Advanced Materials<\/em>.<\/p>\n<p>Alliant solidit\u00e9 et souplesse, ce nouveau film m\u00e9tallique en partie liquide pourrait \u00eatre utilis\u00e9 pour un large panel d\u2019applications. Il devrait permettre l\u2019\u00e9laboration de circuits \u00e9tirables et d\u00e9formables, et donc des peaux artificielles pour proth\u00e8ses ou machines robotiques. Int\u00e9gr\u00e9 \u00e0 des tissus, il pourrait aussi \u00eatre utilis\u00e9 pour la conception de v\u00eatements connect\u00e9s. \u00c9pousant facilement le relief et les mouvements du corps humain, il est pressenti pour la r\u00e9alisation de capteurs d\u00e9di\u00e9s au monitoring de certaines fonctions biologiques.<\/p>\n<p>\u00abOn peut imaginer toutes sortes d\u2019utilisations sur des formes complexes, en mouvements ou qui \u00e9voluent au cours du temps\u00bb, rel\u00e8ve Hadrien Michaud, doctorant au Laboratoire d\u2019interfaces bio\u00e9lectroniques souples (LSBI) et l\u2019un des auteurs de l\u2019\u00e9tude.<\/p>\n<p>Objet de nombreuses recherches, la r\u00e9alisation de circuits \u00e9lectroniques \u00e9lastiques est une v\u00e9ritable gageure, les composants utilis\u00e9s traditionnellement pour la fabrication de circuits \u00e9tant rigides par nature. L\u2019utilisation de m\u00e9taux liquides, int\u00e9gr\u00e9s en couche mince dans des supports de polym\u00e8res aux propri\u00e9t\u00e9s \u00e9lastiques, appara\u00eet donc naturellement comme une piste prometteuse.<\/p>\n<p><strong>Fins et fiables<\/strong><\/p>\n<p>En raison de la grande tension de surface de certains de ces m\u00e9taux liquides, les exp\u00e9riences men\u00e9es jusque-l\u00e0 ne permettaient de r\u00e9aliser que des structures relativement \u00e9paisses. \u00abGr\u00e2ce aux m\u00e9thodes de d\u00e9position et de structuration que nous avons d\u00e9velopp\u00e9es, il est possible de faire des connexions tr\u00e8s fines, c\u2019est-\u00e0-dire de quelques centaines de nanom\u00e8tres d\u2019\u00e9paisseur, et qui restent tr\u00e8s fiables\u00bb, pr\u00e9cise St\u00e9phanie Lacour, titulaire de Chaire Fondation Bertarelli de technologie neuroprosth\u00e9tique et qui dirige le laboratoire.<\/p>\n<p>En plus d\u2019une technique de fabrication bien sp\u00e9cifique, le secret des chercheurs est d\u2019avoir choisi les bons ingr\u00e9dients, c\u2019est-\u00e0-dire un alliage d\u2019or et de gallium. \u00abCe dernier a non seulement de bonnes propri\u00e9t\u00e9s \u00e9lectriques, mais \u00e9galement un seuil de fusion tr\u00e8s bas, soit \u00e0 pr\u00e8s de 30<sup>o<\/sup>C,\u00bb explique Arthur Hirsch, doctorant au LSBI et co-auteur de la recherche. \u00ab Il fond donc dans la main, et gr\u00e2ce \u00e0 un ph\u00e9nom\u00e8ne de surfusion, il reste ensuite liquide \u00e0 temp\u00e9rature ambiante, voire plus basse.\u00bb Quant \u00e0 la couche d\u2019or, elle permet de garantir l\u2019homog\u00e9n\u00e9it\u00e9 du m\u00e9tal, en \u00e9vitant que le gallium, une fois en contact avec le polym\u00e8re, ne forme un r\u00e9seau de gouttelettes et donc un film discontinu et non conducteur.<\/p>\n<p><a href=\"http:\/\/www.epfl.ch\/\">http:\/\/www.epfl.ch\/<\/a><\/p>\n<p>*EPFL Ecole Polytechnique F\u00e9d\u00e9rale de Lausanne<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs de l\u2019EPFL* ont cr\u00e9\u00e9 des pistes \u00e9lectriques d\u00e9formables et \u00e9tirables jusqu\u2019\u00e0 quatre fois leur longueur. Elles pourraient servir \u00e0 la r\u00e9alisation de peaux artificielles, de v\u00eatements connect\u00e9s ou de capteurs corporels.<\/p>\n","protected":false},"author":11,"featured_media":218549,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[],"domains":[47],"ppma_author":[1143],"class_list":["post-218548","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Pistes \u00e9lectriques d\u00e9formables et \u00e9tirables ...<\/title>\n<meta name=\"description\" content=\"Des chercheurs de l\u2019EPFL* ont cr\u00e9\u00e9 des pistes \u00e9lectriques d\u00e9formables et \u00e9tirables jusqu\u2019\u00e0 quatre fois leur longueur. 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