{"id":35488,"date":"2013-01-27T22:31:29","date_gmt":"2013-01-27T22:31:29","guid":{"rendered":"http:\/\/www.pressenza.com\/?p=35488"},"modified":"2013-01-29T14:50:42","modified_gmt":"2013-01-29T14:50:42","slug":"quand-la-forme-agit-sur-la-matiere","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2013\/01\/quand-la-forme-agit-sur-la-matiere\/","title":{"rendered":"Une \u00e9nergie propre ? Quand la forme agit sur la mati\u00e8re !"},"content":{"rendered":"<p><span style=\"font-size: 13px; line-height: 19px;\">Un titre \u00e9trange\u00a0?\u00a0\u00a0Pour ceux que la g\u00e9om\u00e9trie fait peur, vous allez \u00eatre surpris\u00a0! (aussi simple que la terre tourne\u00a0!)<\/span><\/p>\n<p>Vous avez tous d\u00e9j\u00e0 utilis\u00e9 au moins une fois, des \u00ab\u00a0camping-gaz\u00a0\u00bb pour faire de la lumi\u00e8re dans votre tente.\u00a0<span style=\"font-size: 13px; line-height: 19px;\">\u00a0Vous savez, ces petites bouteilles bleu de gaz, avec une sorte de tissus qui enflamme spontan\u00e9ment le gaz d\u00e8s qu\u2019on ouvre le gaz.\u00a0\u00a0Le petit morceau de toile brille ensuite tant que le gaz s\u2019\u00e9chappe. C\u2019est une toile avec du fil de platine, et la r\u00e9action &lsquo;chimique&rsquo; de combustion est induite par &lsquo;catalyse&rsquo;.<\/span><\/p>\n<p>Que s\u2019est il pass\u00e9\u00a0?\u00a0\u00a0C\u2019est de la g\u00e9om\u00e9trie\u00a0!\u00a0\u00a0A l\u2019\u00e9chelle atomique, la g\u00e9om\u00e9trie joue un r\u00f4le actif. Ce qui parait banale \u00e0 notre \u00e9chelle (m, cm, mm\u2026) devient pr\u00e9pond\u00e9rant pour les atomes (nanom\u00e8tre\u2026)<\/p>\n<p>\u00c7a\u00a0\u00a0y est, le mot est l\u00e2ch\u00e9\u2026 \u00ab\u00a0nano\u00a0\u00bb:<\/p>\n<p>Dans le cas du fil de platine, il se trouve que la distance entre 2 atomes de platine est juste plus grand que celle de 2 atomes\u00a0\u00a0du gaz, et l\u00e0 par un ph\u00e9nom\u00e8ne d\u2019attraction presque bizarre,\u00a0\u00a0les 2 atomes de gaz vont se trouver \u00e9tir\u00e9s vers les 2 atomes de platine. Cela suffit pour rendre le gaz suffisamment instable, qu\u2019a la premi\u00e8re occasion, au passage d\u2019une mol\u00e9cule d\u2019oxyg\u00e8ne, il se lib\u00e8re du platine et\u00a0br\u00fble\u00a0l\u2019oxyg\u00e8ne.<\/p>\n<p>C\u2019est encore cette g\u00e9om\u00e9trie qui agit dans le micro-onde\u2026 En effet, qui dit micro-ondes, dit dimensions g\u00e9om\u00e9triques de l\u2019ordre du &lsquo;micron&rsquo; (1000\u00b5 = 1 mm)\u00a0: les ondes microm\u00e9triques.<\/p>\n<p>Et bien foncez sur vos cours de g\u00e9om\u00e9tries, Pythagore et autre\u2026 \u00e0 l\u2019\u00e9chelle atomique, comme pour la lampe \u00e0 gaz, la forme et les dimensions sont primordiales.\u00a0\u00a0Des scientifiques de l\u2019universit\u00e9 de Buffalo (USA) viennent de d\u00e9montrer une fois de plus ce ph\u00e9nom\u00e8ne.\u00a0\u00a0Ils ont fabriqu\u00e9 des cristaux de silicium de 10 nanom\u00e8tre de diam\u00e8tre, pleins de facettes, et la taille et les facettes sont id\u00e9ales pour l\u2019eau. Quand une mol\u00e9cule d\u2019eau entre en contacte avec un cristal, les 2 hydrog\u00e8nes et l\u2019oxyg\u00e8ne se s\u00e9parent spontan\u00e9ment. L\u2019oxyg\u00e8ne reste sur le cristal, mais l\u2019hydrog\u00e8ne s\u2019en va.<\/p>\n<p>Les r\u00e9sultats\u00a0publi\u00e9s en ligne\u00a0dans Nano Letters\u00a0le 14 janvier 2013.\u00a0Les scientifiques\u00a0ont pu v\u00e9rifier que l&rsquo;hydrog\u00e8ne\u00a0qu&rsquo;ils ont fait \u00e9tait\u00a0relativement pure\u00a0en le testant\u00a0avec succ\u00e8s\u00a0dans une\u00a0petite pile \u00e0 combustible\u00a0qui a aliment\u00e9\u00a0un ventilateur.<br \/>\n\u00ab\u00a0Avec le d\u00e9veloppement, cette technologie pourrait\u00a0former\u00a0la base d&rsquo;une batterie \u00e0 l\u2019eau pour g\u00e9n\u00e9rer de l&rsquo;hydrog\u00e8ne\u00a0sur demande \u00bb,\u00a0a d\u00e9clar\u00e9 le chercheur\u00a0Paras\u00a0Prasad, directeur ex\u00e9cutif\u00a0de l&rsquo;Institut\u00a0UB\u00a0pour Lasers,\u00a0photonique et biophotonique\u00a0(ILPB) et un\u00a0SUNY\u00a0professeur \u00e9m\u00e9rite\u00a0dans les services d&rsquo;UB\u00a0de chimie, physique,\u00a0g\u00e9nie \u00e9lectrique\u00a0et m\u00e9decine.\u00a0\u00ab\u00a0L&rsquo;application la plus pratique serait les sources d&rsquo;\u00e9nergie portables\u00a0\u00bb (1).<\/p>\n<p>[media-credit name=\u00a0\u00bbImage : Charles Ruiz \/ Pressenza\u00a0\u00bb align=\u00a0\u00bbaligncenter\u00a0\u00bb width=\u00a0\u00bb300&Prime;]<a href=\"http:\/\/www.pressenza.com\/wp-content\/uploads\/2013\/01\/forme-agit-sur-matiere-pile-combustible.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-35667\" title=\"forme agit sur matiere pile  combustible\" src=\"http:\/\/www.pressenza.com\/wp-content\/uploads\/2013\/01\/forme-agit-sur-matiere-pile-combustible-300x206.jpg\" alt=\"\" width=\"300\" height=\"206\" srcset=\"https:\/\/www.pressenza.com\/wp-content\/uploads\/2013\/01\/forme-agit-sur-matiere-pile-combustible-300x206.jpg 300w, https:\/\/www.pressenza.com\/wp-content\/uploads\/2013\/01\/forme-agit-sur-matiere-pile-combustible-600x412.jpg 600w, https:\/\/www.pressenza.com\/wp-content\/uploads\/2013\/01\/forme-agit-sur-matiere-pile-combustible.jpg 622w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>[\/media-credit]<\/p>\n<p>Une \u00e9nergie propre\u00a0?<\/p>\n<p>Sans doute, \u00e0 condition que la soci\u00e9t\u00e9 l\u2019int\u00e8gre dans un projet d&rsquo;\u00e9co-soci\u00e9t\u00e9, sans guerre et sans violence, sans quoi de telles d\u00e9couvertes , aussi bonnes soient elles, risquent de\u00a0dispara\u00eetre\u00a0dans l\u2019armement sans solutionner notre futur\u00a0!<\/p>\n<p><span style=\"font-size: 13px; line-height: 19px;\">(1)\u00a0<\/span><a style=\"font-size: 13px; line-height: 19px;\" href=\"http:\/\/www.technology.org\/2013\/01\/25\/just-add-water-how-scientists-are-using-silicon-to-produce-hydrogen-on-demand\/\" target=\"_blank\">http:\/\/www.technology.org\/<wbr>2013\/01\/25\/just-add-water-how-<wbr>scientists-are-using-silicon-<wbr>to-produce-hydrogen-on-demand\/<\/wbr><\/wbr><\/wbr><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un titre \u00e9trange\u00a0?\u00a0\u00a0Pour ceux que la g\u00e9om\u00e9trie fait peur, vous allez \u00eatre surpris\u00a0! (aussi simple que la terre tourne\u00a0!) Vous avez tous d\u00e9j\u00e0 utilis\u00e9 au moins une fois, des \u00ab\u00a0camping-gaz\u00a0\u00bb pour faire de la lumi\u00e8re dans votre tente.\u00a0\u00a0Vous savez, ces&hellip;<\/p>\n","protected":false},"author":924,"featured_media":35669,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[495],"tags":[3200,3199],"class_list":["post-35488","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sciences-technologie","tag-energie-propre","tag-nanoparticules"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Une \u00e9nergie propre ? 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