{"id":100457,"date":"2018-10-11T10:05:33","date_gmt":"2018-10-11T08:05:33","guid":{"rendered":"https:\/\/batijournal.com\/?p=100457"},"modified":"2019-07-15T11:21:34","modified_gmt":"2019-07-15T09:21:34","slug":"un-pigment-bleu-de-legypte-antique-pour-refroidir-les-batiments","status":"publish","type":"post","link":"https:\/\/batijournal.com\/index.php\/un-pigment-bleu-de-legypte-antique-pour-refroidir-les-batiments\/100457\/","title":{"rendered":"Un pigment bleu de l&rsquo;Egypte antique pour refroidir les b\u00e2timents"},"content":{"rendered":"<p>Un pigment bleu utilis\u00e9 par les \u00c9gyptiens, il y a des milliers d&rsquo;ann\u00e9es, va trouver des applications dans le refroidissement des fa\u00e7ades et des toits des b\u00e2timents. Le bleu \u00e9gyptien, d\u00e9riv\u00e9 du silicate de cuivre et de calcium, \u00e9tait couramment utilis\u00e9 sur les repr\u00e9sentations anciennes des dieux et de la royaut\u00e9 dans l&rsquo;Egypte antique. Une \u00e9quipe de chercheurs du Laboratoire national Lawrence Berkeley (Berkeley Lab) a mesur\u00e9 la temp\u00e9rature des surfaces rev\u00eatues de cette couleur expos\u00e9es au soleil. Ils ont d\u00e9couvert que ce bleu fluorescent peut \u00e9mettre pr\u00e8s de 100 % des photons absorb\u00e9s. L&rsquo;efficacit\u00e9 \u00e9nerg\u00e9tique du processus d&rsquo;\u00e9mission peut atteindre 70% (les photons infrarouges transportent moins d&rsquo;\u00e9nergie que les photons visibles). Les chercheurs avaient d\u00e9j\u00e0 montr\u00e9 que les pigments fluorescents rouge rubis pouvaient constituer une alternative efficace au blanc. Cette nouvelle d\u00e9couverte ajoute une couleur \u00e0 la palette. Ils ont aussi d\u00e9couvert que des couleurs fluorescentes vertes et noires peuvent \u00eatre produites avec des co-pigments jaunes et oranges. Les nouveaux r\u00e9sultats ont r\u00e9cemment \u00e9t\u00e9 publi\u00e9s dans le Journal of Applied Physics. En plus de son potentiel de refroidissement pour les b\u00e2timents, la fluorescence du bleu \u00e9gyptien pourrait \u00e9galement \u00eatre utile pour la production d\u2019\u00e9nergie solaire photovolta\u00efques.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un pigment bleu utilis\u00e9 par les \u00c9gyptiens, il y a des milliers d&rsquo;ann\u00e9es, va trouver des applications dans le refroidissement des fa\u00e7ades et des toits des b\u00e2timents. Le bleu \u00e9gyptien, d\u00e9riv\u00e9 du silicate de cuivre et de calcium, \u00e9tait couramment utilis\u00e9 sur les repr\u00e9sentations anciennes des dieux et de la royaut\u00e9 dans l&rsquo;Egypte antique. Une [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":100458,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[10530,6340,10771,10775],"tags":[126],"class_list":["post-100457","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-architecture-conception","category-5facades","category-actualites-5facades","tag-facade"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Un pigment bleu de l&#039;Egypte antique pour refroidir les b\u00e2timents<\/title>\n<meta name=\"description\" content=\"Un pigment bleu utilis\u00e9 par les \u00c9gyptiens va trouver des applications dans le refroidissement des fa\u00e7ades et des toits des b\u00e2timents\" \/>\n<meta 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