{"id":1131,"date":"2024-12-28T11:57:25","date_gmt":"2024-12-28T10:57:25","guid":{"rendered":"https:\/\/www.artinphysics.fr\/?page_id=1131"},"modified":"2025-06-21T22:14:03","modified_gmt":"2025-06-21T20:14:03","slug":"1131-2","status":"publish","type":"page","link":"https:\/\/www.artinphysics.fr\/index.php\/1131-2\/","title":{"rendered":""},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-1024x683.jpg\" alt=\"\" class=\"wp-image-1132\" srcset=\"https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-1024x683.jpg 1024w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-300x200.jpg 300w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-768x512.jpg 768w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-1536x1024.jpg 1536w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-2048x1365.jpg 2048w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-500x333.jpg 500w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-800x533.jpg 800w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-1280x853.jpg 1280w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-1920x1280.jpg 1920w, https:\/\/www.artinphysics.fr\/wp-content\/uploads\/2024\/12\/danielrytz_006-507x338.jpg 507w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Photo n\u00b02 \u2013 A la d\u00e9couverte de la croissance cristalline&nbsp;<\/h4>\n\n\n\n<p>Pour cette seconde \u00e9tape de la s\u00e9rie \u00ab \u00c0 la d\u00e9couverte de la croissance cristalline \u00bb, j\u2019ai eu la chance de rencontrer Daniel Rytz, fondateur de l\u2019entreprise Brevalor. Son expertise : la fabrication de cristaux persistants capables d\u2019absorber la lumi\u00e8re, puis de la restituer lentement, en une douce lueur verte qui se prolonge des heures durant.<\/p>\n\n\n\n<p>Il transportait ce jour-l\u00e0 une mallette renfermant une incroyable collection de cristaux, dont j\u2019ai photographi\u00e9 chaque pi\u00e8ce avec fascination. Un v\u00e9ritable tr\u00e9sor visuel. Certains de ces mat\u00e9riaux \u00e9taient persistants, d\u2019autres non. Mais un en particulier attira mon attention : une \u00e9trange pyramide rouge.<\/p>\n\n\n\n<p>Un de ses c\u00f4t\u00e9s brillait d\u2019une parfaite r\u00e9gularit\u00e9, tandis que les autres semblaient sculpt\u00e9s par des ondulations presque liquides. Son sommet, l\u00e9g\u00e8rement aplati, tranchait avec la sym\u00e9trie du reste. Intrigu\u00e9, j\u2019\u00e9coutai les explications de Daniel : il s\u2019agissait d\u2019un double tungstate, compos\u00e9 d\u2019ions potassium et europium. Sa croissance cristalline, bien que similaire \u00e0 celle du rubis observ\u00e9 pr\u00e9c\u00e9demment, reposait sur une organisation interne tr\u00e8s diff\u00e9rente \u2013 ce qui expliquait sa forme si singuli\u00e8re.<\/p>\n\n\n\n<p>Daniel m\u2019expliqua alors que la forme g\u00e9om\u00e9trique d\u2019un cristal d\u00e9pend directement de la disposition des atomes dans sa maille \u00e9l\u00e9mentaire. Selon leur agencement, les cristaux peuvent prendre des formes \u00e9tonnantes : carr\u00e9s, hexagones, pyramides\u2026 Cette pyramide rouge n\u2019\u00e9tait qu\u2019un exemple parmi tant d\u2019autres. D\u2019ailleurs, les collections du Mus\u00e9um d\u2019Histoire Naturelle ou des Mines de Paris regorgent de cristaux naturels aux g\u00e9om\u00e9tries tout aussi fascinantes.<\/p>\n\n\n\n<p>Mais celui-ci avait une autre surprise \u00e0 offrir. Daniel alluma une lampe bleue. Aussit\u00f4t, la pyramide s\u2019illumina d\u2019une lueur orang\u00e9e, presque irr\u00e9elle. C\u2019\u00e9tait l\u2019europium, me dit-il, un ion de la famille des terres rares, qui absorbait la lumi\u00e8re bleue pour la r\u00e9\u00e9mettre sous forme d\u2019une fluorescence d\u00e9licatement rouge-orang\u00e9e. Ce halo r\u00e9v\u00e9la d\u2019un coup les subtilit\u00e9s de ses reliefs, enrichissant mes compositions photographiques d\u2019une nouvelle profondeur.<\/p>\n\n\n\n<p>Une r\u00e9alisation Art in physics, sur la base des recherches de Daniel Rytz, textes librement inspir\u00e9s des prises de vues et des photographies d\u2019Hippolyte Dupont.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"https:\/\/www.artinphysics.fr\/index.php\/1134-2\/\">Acc\u00e9der au podcast n\u00b03<\/a> \u2013 <a href=\"https:\/\/www.artinphysics.fr\">Retour \u00e0 l\u2019accueil<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Pour en savoir plus : <\/h4>\n\n\n\n<div style=\"height:4px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<h5 class=\"wp-block-heading\"><strong>Pour comprendre l\u2019organisation des cristaux&nbsp;:<\/strong><strong> <\/strong><\/h5>\n\n\n\n<p>&#8220;<strong>Les cristaux : des \u00e9difices ordonn\u00e9s &#8211; Enseignement Scientifique \u2013 Premi\u00e8re&#8221; NOVELCLASS<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Les cristaux : des \u00e9difices ordonn\u00e9s - Enseignement Scientifique - Premi\u00e8re\" width=\"880\" height=\"495\" src=\"https:\/\/www.youtube.com\/embed\/sQmObk3kZ-k?start=41&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<h5 class=\"wp-block-heading\"><strong><strong>Pour voir comment fonctionne la fluorescence :  <\/strong><\/strong><\/h5>\n\n\n\n<p><strong>La fluorescence expliqu\u00e9e avec mes \u00e9tag\u00e8res<\/strong>, Julien Bobroff<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"La fluorescence expliqu\u00e9e avec mes \u00e9tag\u00e8res (short n\u00b0133)\" width=\"880\" height=\"495\" src=\"https:\/\/www.youtube.com\/embed\/o_t9juDTpZk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Photo n\u00b02 \u2013 A la d\u00e9couverte de la croissance cristalline&nbsp; Pour cette seconde \u00e9tape de la s\u00e9rie \u00ab \u00c0 la<\/p>\n<p><a href=\"https:\/\/www.artinphysics.fr\/index.php\/1131-2\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"><\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"class_list":["post-1131","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/pages\/1131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/comments?post=1131"}],"version-history":[{"count":6,"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/pages\/1131\/revisions"}],"predecessor-version":[{"id":1218,"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/pages\/1131\/revisions\/1218"}],"wp:attachment":[{"href":"https:\/\/www.artinphysics.fr\/index.php\/wp-json\/wp\/v2\/media?parent=1131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}