{"id":49884,"date":"2023-09-21T23:14:16","date_gmt":"2023-09-21T23:14:16","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau"},"modified":"2023-09-22T00:47:39","modified_gmt":"2023-09-22T00:47:39","slug":"quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau","title":{"rendered":"Quand le verre romain vieux de 2000 ans se transforme en nanomat\u00e9riau"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>La verrerie romaine a connu un immense essor apre\u0300s le 1er sie\u0300cle apre\u0300s J.-C. et les objets issus de cette industrie, re\u0301cipients ou re\u0301alisations plus artistiques, sont connus dans tout le monde romain. Certains intacts et d\u2019autres moins bien conserve\u0301s. Sont e\u0301galement retrouve\u0301s des milliers de petits fragments de bibelots qui furent brise\u0301s de\u0300s cette e\u0301poque. Plusieurs affichent a\u0300 leur surface de magnifiques couleurs irise\u0301es : du bleu, du vert, de l\u2019orange et me\u0302me des reflets dore\u0301s. Ces de\u0301bris sont aujourd\u2019hui utilise\u0301s en orfe\u0300vrerie tandis que les plus gros morceaux sont expose\u0301s dans des muse\u0301es.<\/p>\n

Un miroir dore\u0301<\/b><\/p>\n

Quelques-uns atterrissent aussi dans des laboratoires de physique comme le Silklab de l\u2019Universite\u0301 Tufts, a\u0300 Boston (Etats-Unis), ou\u0300 ils ont e\u0301te\u0301 examine\u0301s par Fiorenzo Omenetto et Giulia Guidetti, experts en science des mate\u0301riaux. Les deux chercheurs ont notamment e\u0301tudie\u0301 un fragment de verre retrouve\u0301 pre\u0300s de l\u2019ancienne ville d\u2019Aquile\u0301e, en Italie, et surnomme\u0301 \u201cverre wow\u201d tant ses couleurs ont impressionne\u0301 : il a garde\u0301 sa patine vert fonce\u0301 d\u2019origine mais une partie de sa surface est recouverte d\u2019une fine couche, d\u2019un millime\u0300tre d\u2019e\u0301paisseur, qui affiche un reflet dore\u0301 presque parfait, semblable a\u0300 celui d\u2019un miroir.<\/p>\n

La datation de l\u2019e\u0301chantillon re\u0301ve\u0300le qu\u2019il a e\u0301te\u0301 fabrique\u0301 entre le 1er sie\u0300cle avant J.-C. et le 1er sie\u0300cle apre\u0300s J.-C. a\u0300 partir, d\u2019apre\u0300s l\u2019analyse chimique, de sable en provenance d\u2019Egypte. L\u2019examen au microscope a\u0300 balayage e\u0301lectronique indique, lui, que la pellicule mordore\u0301e est compose\u0301e de couches de silice tre\u0300s re\u0301gulie\u0300res, d\u2019une e\u0301paisseur microme\u0301trique, alternant haute et basse densite\u0301. Un arrangement qui rappelle les miroirs de Bragg (mis au point par William Lawrence Bragg, laure\u0301at du prix Nobel de physique de 1915) ou\u0300 chaque couche re\u0301fle\u0301chit fortement une longueur d\u2019onde diffe\u0301rente. L\u2019empilement vertical de dizaines de couches de Bragg a donne\u0301 a\u0300 la pellicule son aspect de miroir dore\u0301.<\/p>\n

Transformation naturelle<\/b><\/p>\n

En fait, il s\u2019est forme\u0301 a\u0300 la surface de ce verre de ve\u0301ritables cristaux photoniques. L\u2019utilisation et la synthe\u0300se de ces cristaux, un premier pas vers la manipulation de la lumie\u0300re, sont des de\u0301fis pour les physiciens depuis plusieurs anne\u0301es car ils peuvent avoir de multiples applications dans l\u2019industrie des lasers, des communications ou des mate\u0301riaux furtifs. \u201cC\u2019est vraiment remarquable de trouver du verre qui est reste\u0301 pendant pre\u0300s de 2000 ans dans la boue et de se retrouver avec un exemple classique de composant nanophotonique\u201d, s\u2019e\u0301tonne, dans un communique\u0301, Fiorenzo Omenetto.<\/p>\n

Mais comment ces cristaux photoniques se sont-ils forme\u0301s ? Selon les chercheurs, qui publient leurs re\u0301sultats dans les Pnas, le temps y est pour beaucoup. Au fil des anne\u0301es, la pluie et l\u2019argile qui entouraient le verre ont ge\u0301ne\u0301re\u0301 une corrosion cyclique de la silice avec une inclusion de mine\u0301raux qui ont structure\u0301 des centaines de couches de 100 nanome\u0300tres d\u2019e\u0301paisseur de mate\u0301riau cristallin. Ils espe\u0300rent maintenant mieux comprendre ce processus pour tenter de l\u2019acce\u0301le\u0301rer et ainsi cultiver en laboratoire des cristaux photoniques pluto\u0302t que de les fabriquer.<\/p>\n

Pour plus d’informations et d’analyses sur la Senegal<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Senegal. La verrerie romaine a connu un immense essor apre\u0300s le 1er sie\u0300cle apre\u0300s J.-C. et les objets issus de cette industrie, re\u0301cipients ou re\u0301alisations plus artistiques, sont connus dans tout le monde romain. Certains intacts et d\u2019autres moins bien conserve\u0301s. Sont e\u0301galement retrouve\u0301s des milliers de petits fragments de bibelots qui furent […]<\/p>\n","protected":false},"author":82,"featured_media":49883,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[43,47,44],"class_list":["post-49884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press-2","tag-africa-press-senegal","tag-senegal-2"],"yoast_head":"\nQuand le verre romain vieux de 2000 ans se transforme en nanomat\u00e9riau - Senegal<\/title>\n<meta name=\"description\" content=\"La verrerie romaine a connu un immense essor apre\u0300s le 1er sie\u0300cle apre\u0300s J.-C. et les objets issus de cette industrie, ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quand le verre romain vieux de 2000 ans se transforme en nanomat\u00e9riau\" \/>\n<meta property=\"og:description\" content=\"La verrerie romaine a connu un immense essor apre\u0300s le 1er sie\u0300cle apre\u0300s J.-C. et les objets issus de cette industrie, ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-21T23:14:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-22T00:47:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2023\/09\/sm_1695327037.324592.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"899\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Quand le verre romain vieux de 2000 ans se transforme en nanomat\u00e9riau\",\"datePublished\":\"2023-09-21T23:14:16+00:00\",\"dateModified\":\"2023-09-22T00:47:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau\"},\"wordCount\":604,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2023\/09\/sm_1695327037.324592.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Senegal\",\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/quand-le-verre-romain-vieux-de-2000-ans-se-transforme-en-nanomateriau\",\"name\":\"Quand le verre romain vieux de 2000 ans se transforme en nanomat\u00e9riau - 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