
{"id":6595,"date":"2012-09-17T07:44:00","date_gmt":"2012-09-17T07:44:00","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/new\/escanejant-lactivitat-electrocatalitica-de-nanoparticules-individuals\/"},"modified":"2015-10-20T14:45:15","modified_gmt":"2015-10-20T14:45:15","slug":"escanejant-lactivitat-electrocatalitica-de-nanoparticules-individuals","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/escanejant-lactivitat-electrocatalitica-de-nanoparticules-individuals\/","title":{"rendered":"Escanejant l&#8217;activitat electrocatal\u00edtica de nanopart\u00edcules individuals"},"content":{"rendered":"<h6 class=\"caption\" style=\"width: 230px; float: left; padding: 0px 10px 10px 0px; margin-top: 100px;\">Imatge: P-ECi de densitat actual d&#8217;una \u00fanica nanopart\u00edcula de plat\u00ed a potencial de \u22120.5. Barra d&#8217;escala 3 \u00b5m.<\/h3>\n<p>Els catalitzadors a base de nanopart\u00edcules es fan servir en l&#8217;elaboraci\u00f3 de pol\u00edmers i biocombustibles, sintetitzaci\u00f3 de nous f\u00e0rmacs, dispositius de control de la pol\u00b7luci\u00f3 i tecnologia de c\u00e8l\u00b7lules de combustible, i \u00e9s vital tant caracteritzar-los com anar descobrint-ne els m\u00e9s efectius. A l&#8217;art\u00edcle publicat l&#8217;agost, l&#8217;investigador s\u00e8nior del grup Nanosondes i Nanocommutadors, l&#8217;Ismael D\u00edez-P\u00e9rez \u2013 en col\u00b7laboraci\u00f3 amb investigadors del Biodesign Institute de l&#8217;Arizona State University \u2013 revel\u00b7la una forma innovadora de mesurar les reaccions catalitzadores de nanopart\u00edcules individuals, a m\u00e9s de part\u00edcules m\u00faltiples impreses en arrays.<\/p>\n<p>&#8220;La major part dels materials catal\u00edtics obtinguts en laboratoris contenen nanopart\u00edcules variades amb diferents activitats electrocatal\u00edtiques, per\u00f2 fins ara nom\u00e9s ha estat possible mesurar la mitjana de propietats de totes elles, i no les propietats de part\u00edcules individuals,&#8221; explica l&#8217;Ismael. &#8220;Si podem mesurar les reaccions catal\u00edtiques de part\u00edcules individuals, podrem entendre com la mida, l&#8217;orientaci\u00f3 dels cristalls i la composici\u00f3 de la nanopart\u00edcula estan relacionats amb l&#8217;efici\u00e8ncia d&#8217;una reacci\u00f3 catal\u00edtica, a m\u00e9s de poder escanejar arrays sencers d&#8217;aquestes reaccions, que es poden fer servir per un filtrat r\u00e0pid.&#8221;<\/p>\n<p>Dins de l&#8217;estudi, les nanopart\u00edcules s&#8217;investiguen fent servir una nova t\u00e8cnica desenvolupada anteriorment pel mateix grup, l&#8217;escanejat electroqu\u00edmic plasm\u00f2nic. Aquest consisteix en el processat \u00f2ptic de reaccions electroqu\u00edmiques basades en la reson\u00e0ncia en superf\u00edcie de plasmons, un proc\u00e9s de detecci\u00f3 que t\u00e9 lloc quan un raig de llum polaritzada xoca amb un prisma cobert per una delgada capa met\u00e0l\u00b7lica. &#8220;B\u00e0sicament, mesurem les reaccions electroqu\u00edmiques, no mirant els electrodes, sin\u00f3 concentrant-nos en les reaccions properes a ells,&#8221; diu l&#8217;Ismael. &#8220;Aquestes causen canvis en la reflectivitat de la llum, que la nova t\u00e8cnica converteix en una imatge \u00f2ptica.&#8221;<\/p>\n<p>Fent servir aquesta t\u00e8cnica, els investigadors van poder estudiar part\u00edcules individuals, que apareixen com punts en un array que van apareixent al llarg del temps, a mesura que canvia el potencial. Els resultats van mostrar que el corrent electrocatal\u00edtic augmenta proporcionalment a la densitat de nanopart\u00edcules. Els cient\u00edfics tamb\u00e9 van poder estudiar l&#8217;activitat electrocatal\u00edtica de les nanopart\u00edcules de plat\u00ed impreses en un microarray, mostrant per primera vegada la possibilitat d&#8217;un processat d&#8217;alt rendiment de l&#8217;activitat catalitzadora de les nanopart\u00edcules.<\/p>\n<p>Aquesta nova t\u00e8cnica, r\u00e0pida i no invasiva, tamb\u00e9 sembla prometedora per la recerca de nous catalitzadors, i es pot fer servir en altres \u00e0rees on actualment es fan servir m\u00e8todes convencionals de detecci\u00f3 electroqu\u00edmica.<\/p>\n<p>&#8212;<\/p>\n<div>\n<p>D\u00edez P\u00e9rez, I., Wang, L., Wiktor, P., Gu, Y., L., Z., W., W., Lu, J., Wang, S., Gong, Q. &amp; Tao, N. (2012). <strong><a href=\"http:\/\/www.nature.com\/nnano\/journal\/vaop\/ncurrent\/full\/nnano.2012.134.html\" target=\"_blank\">Imaging the electrocatalytic activity of single nanoparticles<\/a><\/strong>. <em>Nature Nanotechnology<\/em>, 7, 668\u2013672<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<h3><img decoding=\"async\" class=\"left size-full wp-image-6591 lazyload\" data-src=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/09\/ismanature.jpg\" border=\"0\" width=\"227\" height=\"214\" data-srcset=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/09\/ismanature.jpg 227w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/09\/ismanature-159x150.jpg 159w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/09\/ismanature-150x141.jpg 150w\" data-sizes=\"(max-width: 227px) 100vw, 227px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 227px; --smush-placeholder-aspect-ratio: 227\/214;\" \/>Un investigador del IBEC ha col\u00b7laborat en un article publicat a la revista <em>Nature Nanotechnology<\/em> en el que es descriu un nou i efectiu m\u00e8tode per caracteritzar i millorar els catalitzadors a base de nanopart\u00edcules, que juguen rols essencials en la biomedicina, la ind\u00fastria i la vida quotidiana en afectar el ritme amb el que tenen lloc les reaccions qu\u00edmiques.<\/h3>\n","protected":false},"author":4,"featured_media":6591,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-6595","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 v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Escanejant l&#039;activitat 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