
{"id":21550,"date":"2016-02-09T11:24:57","date_gmt":"2016-02-09T10:24:57","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/?p=21550"},"modified":"2016-06-20T15:23:28","modified_gmt":"2016-06-20T13:23:28","slug":"micromotors-use-surface-variations-for-docking-and-guiding-3","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/micromotors-use-surface-variations-for-docking-and-guiding-3\/","title":{"rendered":"Nous Micromotors que s&#8217;orienten mitjan\u00e7ant petites alteracions en la superf\u00edcie"},"content":{"rendered":"<p>Aquest nou estudi, resultat d&#8217;una col\u00b7laboraci\u00f3 entre la recerca experimental i la te\u00f2rica, demostra que les part\u00edcules poden utilitzar les caracter\u00edstiques de les superf\u00edcies sobre les quals es desplacen per canviar la seva direcci\u00f3 de moviment. \u201cEls micromotors tendeixen a assentar-se i a moure&#8217;s prop de les superf\u00edcies, i hem vist que aquesta tend\u00e8ncia interfereix en la seva traject\u00f2ria\u201d, comenta Samuel S\u00e1nchez, professor ICREA i investigador principal del grup Smart nano-bio-devices en el IBEC i en el Stuttgart MPI-ES. \u201cAquesta peculiaritat ens ha portat a explorar nous m\u00e8todes per guiar micromotors mitjan\u00e7ant alteracions en la superf\u00edcie\u201d.<\/p>\n<p><img decoding=\"async\" class=\"left size-full wp-image-21507 lazyload\" data-src=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2016\/02\/Fig-3-Sanchez-web-1.jpg\" alt=\"\" width=\"600\" height=\"201\" data-srcset=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2016\/02\/Fig-3-Sanchez-web-1.jpg 600w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2016\/02\/Fig-3-Sanchez-web-1-300x101.jpg 300w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2016\/02\/Fig-3-Sanchez-web-1-230x77.jpg 230w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2016\/02\/Fig-3-Sanchez-web-1-150x50.jpg 150w\" data-sizes=\"(max-width: 600px) 100vw, 600px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 600px; --smush-placeholder-aspect-ratio: 600\/201;\" \/><\/p>\n<h6 class=\"caption\" style=\"padding: 0px 10px 10px 30px;\">Imatge, esquerra: Una part\u00edcula activa s&#8217;aproxima a un pas microfabricat i es reorienta despla\u00e7ant-se al seu llarg.<\/h6>\n<p>Mitjan\u00e7ant un proc\u00e9s de microfabricaci\u00f3, els investigadors van modificar la superf\u00edcie creant una s\u00e8rie de diminutes marques (diverses vegades m\u00e9s petites que el radi de la part\u00edcula), de manera que, un tipus espec\u00edfic de micromotors -creats a partir de part\u00edcules esf\u00e8riques Janus, la superf\u00edcie de les quals t\u00e9 dues o m\u00e9s propietats f\u00edsiques diferents- poguessin usar-les com a guia per seguir un recorregut espec\u00edfic. Aquesta estrat\u00e8gia est\u00e0 inspirada en la que utilitzen els motors moleculars en els sistemes naturals, quan, a l&#8217;interior cel\u00b7lular, les prote\u00efnes motores s&#8217;uneixen als filaments del citosquelet per aconseguir el moviment direccional.<\/p>\n<p>Les part\u00edcules Janus -que prenen el seu nom del D\u00e9u de les portes en la mitologia romana i que es representa amb dues cares mirant punts oposats-, estan formades per una meitat de plat\u00ed i l&#8217;altra de s\u00edlice. Quan la cara del plat\u00ed actua com un catalitzador en per\u00f2xid d&#8217;hidrogen, la cara de s\u00edlice roman inert, una asimetria en les propietats qu\u00edmiques que produeix el moviment d&#8217;autopropulsi\u00f3 en aquests col\u00b7loides. Els investigadors van detectar que les part\u00edcules tendien a tenir una orientaci\u00f3 estable paral\u00b7lela a la superf\u00edcie, i van explotar aquest fenomen per guiar les part\u00edcules al llarg de les diminutes passes, d&#8217;aquesta manera, van poder demostrar que, l&#8217;activitat qu\u00edmica de les part\u00edcules i les interaccions hidrodin\u00e0miques associades amb les superf\u00edcies properes s\u00f3n responsables del fenomen observat.<\/p>\n<p>\u201cEls resultats de l&#8217;estudi obren la possibilitat de guiar aquest tipus de part\u00edcules al llarg de vies complexes mitjan\u00e7ant petites modificacions de la superf\u00edcie\u201d, comenta Samuel. \u201cAix\u00f2 pot tenir implicacions significatives en el disseny de nous micromotors artificials per a m\u00faltiples aplicacions\u201d.<\/p>\n<p>&#8212;<\/p>\n<p>Simmchen, J., Katuri, J., Uspal, W.E., Popescu, M.N., Tasinkevych, M., and S\u00e1nchez, S. (2016). <a href=\"http:\/\/www.nature.com\/ncomms\/2016\/160209\/ncomms10598\/full\/ncomms10598.html\">Topographical pathways guide chemical microswimmers<\/a>. <em>Nat. Commun<\/em>, 7, 10598<\/p>\n","protected":false},"excerpt":{"rendered":"<h3>Investigadors de l&#8217;IBEC, en col\u00b7laboraci\u00f3 amb el Max-Planck Institute for Intelligent Systems i la Universitat de Stuttgart, han descrit, en un article publicat avui en la revista Nature Communications, un tipus de micromotor que es guia utilitzant diminuts patrons topogr\u00e0fics en les superf\u00edcies per les quals es despla\u00e7a.<\/h3>\n<p>Els anteriors micromotors de Samuel S\u00e1nchez i Mykola Tasinkevych es guiaven a trav\u00e9s dels fluids utilitzant un revestiment magn\u00e8tic dissenyat especialment, la qual cosa permetia que, combinat amb camps magn\u00e8tics externs, es pogu\u00e9s controlar la seva traject\u00f2ria.<\/p>\n","protected":false},"author":4,"featured_media":21509,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-21550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies-de-recerca"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nous Micromotors que s&#039;orienten mitjan\u00e7ant petites alteracions en la superf\u00edcie - Institute for Bioengineering of Catalonia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ibecbarcelona.eu\/ca\/micromotors-use-surface-variations-for-docking-and-guiding-3\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nous Micromotors que s&#039;orienten mitjan\u00e7ant petites alteracions en la superf\u00edcie - Institute for Bioengineering of Catalonia\" \/>\n<meta property=\"og:description\" content=\"Investigadors de l&#039;IBEC, en col\u00b7laboraci\u00f3 amb el Max-Planck Institute for Intelligent Systems i la Universitat de Stuttgart, han descrit, en un article publicat avui en la revista Nature Communications, un tipus de micromotor que es guia utilitzant diminuts patrons topogr\u00e0fics en les superf\u00edcies per les quals es despla\u00e7a.  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