{"id":1132137,"date":"2020-06-10T12:49:04","date_gmt":"2020-06-10T11:49:04","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=1132137"},"modified":"2020-08-01T23:38:34","modified_gmt":"2020-08-01T22:38:34","slug":"pour-la-premiere-fois-des-scientifiques-captent-le-mouvement-de-molecules-individuelles-dans-une-video-a-grande-vitesse","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2020\/06\/pour-la-premiere-fois-des-scientifiques-captent-le-mouvement-de-molecules-individuelles-dans-une-video-a-grande-vitesse\/","title":{"rendered":"Pour la premi\u00e8re fois, des scientifiques captent le mouvement de mol\u00e9cules individuelles dans une vid\u00e9o \u00e0 grande vitesse"},"content":{"rendered":"

Un groupe de scientifiques de l’Universit\u00e9 de Tokyo (Japon) et de l’Institut polytechnique et de l’Universit\u00e9 d’\u00c9tat de Virginie (\u00c9tats-Unis) a captur\u00e9 pour la premi\u00e8re fois le mouvement de mol\u00e9cules individuelles sur vid\u00e9o \u00e0 une vitesse sans pr\u00e9c\u00e9dent de 1600 images par seconde (fps), selon une recherche<\/a> publi\u00e9e jeudi dans le Bulletin de la Soci\u00e9t\u00e9 chimique du Japon.<\/p>\n

Au cours des recherches, les scientifiques ont \u00e9quip\u00e9 un puissant microscope \u00e9lectronique \u00e0 transmission, capable de r\u00e9soudre des objets plus petits qu’un angstr\u00f6m (un dix milliardi\u00e8me de m\u00e8tre), avec une cam\u00e9ra \u00e0 d\u00e9tection directe d’\u00e9lectrons pour capturer en temps r\u00e9el des \u00e9v\u00e9nements \u00e0 l’\u00e9chelle atomique \u00e0 une vitesse 100 fois plus rapide que les exp\u00e9riences pr\u00e9c\u00e9dentes de cette nature.<\/p>\n

\"\"<\/p>\n

Les chercheurs ont film\u00e9 des nanotubes de carbone vibrants contenant des mol\u00e9cules de fuller\u00e8ne, capturant, entre autres, le mouvement oscillatoire de ces mol\u00e9cules jamais vu auparavant, ce qui n’est perceptible qu’\u00e0 des fr\u00e9quences d’images tr\u00e8s \u00e9lev\u00e9es.<\/p>\n

Pour \u00e9liminer le bruit visuel caus\u00e9 par la haute sensibilit\u00e9 des cam\u00e9ras utilis\u00e9es, ainsi que les hautes fr\u00e9quences des prises de vue, il a \u00e9t\u00e9 n\u00e9cessaire d’utiliser un traitement d’images avanc\u00e9 connu sous le nom de \u00ab\u00a0minimisation de la variance totale\u00a0\u00bb de Chambolle[1]<\/a>.<\/p>\n

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<\/picture><\/div>\n<\/div>\n

\u00ab\u00a0Nous avons \u00e9t\u00e9 agr\u00e9ablement surpris que cette suppression du bruit et ce traitement de l’image r\u00e9v\u00e8lent le mouvement invisible des mol\u00e9cules de fuller\u00e8ne\u00a0\u00bb, a d\u00e9clar\u00e9 Koji Harano, co-auteur de la recherche.<\/p>\n

\u00ab\u00a0Nous avons toujours un s\u00e9rieux probl\u00e8me, \u00e0 savoir que le traitement [des images] est effectu\u00e9 apr\u00e8s<\/em> la capture de la vid\u00e9o\u00a0\u00bb, a d\u00e9clar\u00e9 M. Harano. \u00ab\u00a0Cependant, un retour visuel en temps r\u00e9el<\/em> des observations pourrait \u00eatre possible dans peu de temps gr\u00e2ce \u00e0 un \u00e9quipement informatique performant\u00a0\u00bb, a d\u00e9clar\u00e9 le chercheur.<\/p>\n

 <\/p>\n

Notes<\/strong><\/p>\n

[1]<\/a> Pour les sp\u00e9cialistes\u00a0: pr\u00e9sentation et colloque r\u00e9alis\u00e9s \u00e0 Bordeaux\u00a0: https:\/\/interactions19.sciencesconf.org\/data\/pages\/Caillaud.pdf<\/p>\n

 <\/p>\n<\/article>\n

Traduction de l’espagnol Claudie Baudoin<\/em><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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