{"id":63718,"date":"2020-06-21T19:11:35","date_gmt":"2020-06-21T19:11:35","guid":{"rendered":""},"modified":"2020-06-21T19:11:35","modified_gmt":"2020-06-21T19:11:35","slug":"apres-les-plantes-lhumidite-transformee-en-energie-a-luniversite-de-tel-aviv","status":"publish","type":"post","link":"https:\/\/harissa.com\/news-wp\/apres-les-plantes-lhumidite-transformee-en-energie-a-luniversite-de-tel-aviv\/","title":{"rendered":"Apr\u00e8s les plantes, l\u2019humidit\u00e9 transform\u00e9e en \u00e9nergie \u00e0 l\u2019universit\u00e9 de Tel Aviv"},"content":{"rendered":"<p>Apr\u00e8s les plantes, l\u2019humidit\u00e9 transform\u00e9e en \u00e9nergie \u00e0 l\u2019universit\u00e9 de Tel Aviv<\/p>\n<p>\nDes chercheurs ont d\u00e9couvert que des tensions \u00e9lectriques se d\u00e9veloppaient entre deux surfaces m\u00e9talliques avec une humidit\u00e9 \u00e0 plus de 60 % : Bient\u00f4t des batteries \u00e0 la vapeur ?<\/p>\n<p>Par SUE SURKES<\/p>\n<p>Les scientifiques isra\u00e9liens ont d\u2019ores et d\u00e9j\u00e0 appris comment produire de l\u2019eau \u00e0 partir de l\u2019air et vice versa, de l\u2019\u00e9lectricit\u00e9 \u00e0 partir des plantes. Aujourd\u2019hui, ils semblent d\u00e9j\u00e0 \u00eatre pr\u00eats \u00e0 cr\u00e9er de l\u2019\u00e9lectricit\u00e9 \u00e0 partir de l\u2019humidit\u00e9.<\/p>\n<p>La recherche \u2013 qui a \u00e9t\u00e9 dirig\u00e9e par le professeur Colin Price en collaboration avec le professeur Hadas Saaroni et la doctorante Judi Lax, qui appartiennent tous \u00e0 l\u2019\u00e9cole Porter de l\u2019universit\u00e9 de Tel Aviv d\u2019environnement et de sciences de la terre \u2013 s\u2019est bas\u00e9e sur la connaissance selon laquelle l\u2019\u00e9lectricit\u00e9 est g\u00e9n\u00e9r\u00e9e par une interaction entre les mol\u00e9cules d\u2019eau et les surfaces m\u00e9talliques.<\/p>\n<p>\u00ab Nous avons cherch\u00e9 \u00e0 exploiter un ph\u00e9nom\u00e8ne qui arrive naturellement \u2013 celui de l\u2019\u00e9lectricit\u00e9 cr\u00e9\u00e9e \u00e0 partir de l\u2019eau \u00bb, explique Price. \u00ab L\u2019\u00e9lectricit\u00e9 dans les orages n\u2019est g\u00e9n\u00e9r\u00e9e que par l\u2019eau dans ses diff\u00e9rentes phases \u2013 vapeur d\u2019eau, gouttes d\u2019eau et glace. Vingt minutes de d\u00e9veloppement de nuages, c\u2019est gr\u00e2ce \u00e0 cela qu\u2019on passe des gouttes d\u2019eau \u00e0 d\u2019\u00e9normes d\u00e9charges \u00e9lectriques \u2013 l\u2019\u00e9clair, qui fait un demi kilom\u00e8tre de longueur \u00bb.<\/p>\n<p>Au 19e si\u00e8cle, le physicien anglais Michael Faraday avait d\u00e9couvert que les gouttes d\u2019eau pouvaient charger d\u2019\u00e9lectricit\u00e9 les surfaces m\u00e9talliques en raison de la friction entre les deux \u00e9l\u00e9ments. Une \u00e9tude plus r\u00e9cente a montr\u00e9 que certains m\u00e9taux produisaient spontan\u00e9ment une d\u00e9charge \u00e9lectrique lorsqu\u2019ils \u00e9taient expos\u00e9s \u00e0 l\u2019humidit\u00e9.<\/p>\n<p>Travaillant sur les conclusions de d\u00e9couvertes faites pr\u00e9c\u00e9demment telles que celle-ci, les chercheurs ont d\u00e9cid\u00e9 de tester la possibilit\u00e9 de fabriquer une minuscule batterie \u00e0 faible tension en n\u2019utilisant rien d\u2019autre que l\u2019humidit\u00e9 dans l\u2019air.<\/p>\n<p>Ils ont expos\u00e9 deux m\u00e9taux diff\u00e9rents \u00e0 des niveaux diff\u00e9rents d\u2019humidit\u00e9, l\u2019un d\u2019entre eux plac\u00e9 \u00e0 la masse.<\/p>\n<p>\u00ab Nous avons d\u00e9couvert qu\u2019il n\u2019y avait pas de tension \u00e9lectrique entre les deux m\u00e9taux quand l\u2019air \u00e9tait sec \u00bb, explique Price. \u00ab Mais une fois que le niveau relatif d\u2019humidit\u00e9 a d\u00e9pass\u00e9 les 60 %, une tension \u00e9lectrique a commenc\u00e9 \u00e0 se d\u00e9velopper entre les deux surfaces de m\u00e9tal isol\u00e9es. Quand nous avons fait baisser le taux d\u2019humidit\u00e9 \u00e0 moins de 60 %, ce voltage a disparu. Quand nous avons fait l\u2019exp\u00e9rience \u00e0 l\u2019ext\u00e9rieur, dans des conditions naturelles, nous avons obtenu le m\u00eame r\u00e9sultat \u00bb.<\/p>\n<p>Il ajoute que \u00ab l\u2019eau est une mol\u00e9cule tr\u00e8s particuli\u00e8re. Pendant les collisions mol\u00e9culaires, elle peut transf\u00e9rer une d\u00e9charge \u00e9lectrique d\u2019une mol\u00e9cule \u00e0 l\u2019autre. En passant par la friction, elle peut entra\u00eener une sorte d\u2019\u00e9lectricit\u00e9 statique \u00bb.<\/p>\n<p>\u00ab Nous avons tent\u00e9 de reproduire de l\u2019\u00e9lectricit\u00e9 en laboratoire et nous avons d\u00e9couvert que les diff\u00e9rentes surfaces de m\u00e9tal isol\u00e9es \u00e9taient constitu\u00e9es de diff\u00e9rentes quantit\u00e9s de d\u00e9charge n\u00e9es de la vapeur de l\u2019eau dans l\u2019atmosph\u00e8re, mais seulement si l\u2019humidit\u00e9 relative \u00e0 l\u2019air d\u00e9passait les 60 %. C\u2019est un ph\u00e9nom\u00e8ne qui est presque quotidien en Isra\u00ebl pendant l\u2019\u00e9t\u00e9, et qui se produit tous les jours dans la majorit\u00e9 des pays tropicaux, \u00bb remarque-t-il.<\/p>\n<p>Selon Price, cette \u00e9tude vient mettre \u00e0 l\u2019\u00e9preuve les id\u00e9es \u00e9tablies sur l\u2019humidit\u00e9 et sur son potentiel en tant que source d\u2019\u00e9nergie.<\/p>\n<p>\u00ab Les gens savent que l\u2019air chaud entra\u00eene de l\u2019\u00e9lectricit\u00e9 statique et que, parfois, vous prenez une d\u00e9charge lorsque vous touchez la poign\u00e9e en m\u00e9tal d\u2019une porte. On pense habituellement que l\u2019eau est un bon conducteur d\u2019\u00e9lectricit\u00e9 mais pas un \u00e9l\u00e9ment susceptible de cr\u00e9er une d\u00e9charge sur une surface. Il semble n\u00e9anmoins que les choses soient diff\u00e9rentes une fois que l\u2019humidit\u00e9 relative atteint un certain seuil \u00bb, explique-t-il.<\/p>\n<p>Les chercheurs ont \u00e9t\u00e9 en mesure de montrer que l\u2019air humide pouvait \u00eatre source de charge \u00e9lectrique sur les surfaces d\u2019environ un volt. \u00ab Si une pile AA est de 1,5 volt, il pourrait y avoir une application pratique \u00e0 l\u2019avenir : D\u00e9velopper des piles qui pourront \u00eatre charg\u00e9es \u00e0 partir de la vapeur d\u2019eau dans l\u2019air \u00bb, note Price.<\/p>\n<p>\u00ab Ces r\u00e9sultats pourraient prendre une importance particuli\u00e8re en tant que ressource \u00e9nerg\u00e9tique renouvelable dans les pays en d\u00e9veloppement o\u00f9 de nombreuses communaut\u00e9s n\u2019ont toujours pas acc\u00e8s \u00e0 l\u2019\u00e9lectricit\u00e9, mais o\u00f9 l\u2019humidit\u00e9 est constamment au-dessus de 60 % \u00bb.<\/p>\n<p>Cette recherche, qui a \u00e9t\u00e9 rendue publique par l\u2019universit\u00e9 la semaine derni\u00e8re, a \u00e9t\u00e9 publi\u00e9e dans le journal Nature Scientific Reports au mois de mai.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s les plantes, l\u2019humidit\u00e9 transform\u00e9e en \u00e9nergie \u00e0 l\u2019universit\u00e9 de Tel Aviv Des chercheurs ont d\u00e9couvert que des tensions \u00e9lectriques se d\u00e9veloppaient entre deux surfaces m\u00e9talliques avec une humidit\u00e9 \u00e0 plus de 60 % : Bient\u00f4t des batteries \u00e0 la vapeur ? Par SUE SURKES Les scientifiques isra\u00e9liens ont d\u2019ores et d\u00e9j\u00e0 appris comment produire&hellip;&nbsp;<\/p>\n","protected":false},"author":1,"featured_media":63719,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-63718","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Apr\u00e8s les plantes, l\u2019humidit\u00e9 transform\u00e9e en \u00e9nergie \u00e0 l\u2019universit\u00e9 de Tel Aviv | 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