{"id":22640,"date":"2023-04-14T10:05:45","date_gmt":"2023-04-14T10:05:45","guid":{"rendered":"https:\/\/cit.upc.edu\/?post_type=portfolio&p=22640"},"modified":"2023-04-17T08:48:56","modified_gmt":"2023-04-17T08:48:56","slug":"nous-metamaterials-capacos-de-detectar-la-quiralitat-molecular","status":"publish","type":"portfolio","link":"https:\/\/cit.upc.edu\/ca\/portfolio-item\/nous-metamaterials-capacos-de-detectar-la-quiralitat-molecular\/","title":{"rendered":"Nous metamaterials capa\u00e7os de detectar la quiralitat molecular"},"content":{"rendered":"\n

14\/04\/2023
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La quiralitat \u00e9s una propietat present a la natura que consisteix en la no superposici\u00f3 d\\’un objecte amb la seva imatge especular, o, el que \u00e9s el mateix, el seu reflex en un mirall. Aix\u00ed, per exemple, la m\u00e0 dreta no es pot superposar a la seva imatge especular, que \u00e9s la m\u00e0 esquerra. Tot i que la seva f\u00f3rmula molecular \u00e9s id\u00e8ntica, l\\’orientaci\u00f3 tridimensional \u00e9s diferent.\r
La detecci\u00f3 d\\’estructures quirals a trav\u00e9s d\\’espectrosc\u00f2pia quiral \u00e9s fonamental en qu\u00edmica, biologia i la ind\u00fastria farmac\u00e8utica, ja que proporciona informaci\u00f3 important sobre les estructures secund\u00e0ries de prote\u00efnes, transicions electr\u00f2niques i conformaci\u00f3 de petites mol\u00e8cules. No obstant aix\u00f2, detectar la quiralitat molecular resulta molt complicat, ja que el senyal que apareix en l\\’espectr\u00f2metre \u00e9s tan d\u00e8bil que fa dif\u00edcil identificar aquestes difer\u00e8ncies en l\\’estructura molecular.\u00a0\u00a0\u00a0\r
Per avan\u00e7ar en aquest camp, el grup de recerca Polyfunctional Polymeric Materials (POLY2) de la Universitat Polit\u00e8cnica de Catalunya – BarcelonaTech (UPC) treballar\u00e0 en el projecte CELICOIDS – Nanohelicoid metamaterials templated by cellulose nanocrystals with end-tethered polymers, en el marc del qual es desenvoluparan nous metamaterials \u2212materials dissenyats per tenir una propietat que no es troba en la natura\u2212 capa\u00e7os d\u2019augmentar la sensibilitat espectrosc\u00f2pica per distingir la quiralitat molecular. Aquests metamaterials, amb forma helicoidal, s\\’obtindran a partir de cel\u00b7lulosa, un polisac\u00e0rid extret del paper, cot\u00f3 o altres fibres vegetals, a la qual s\\’aplicar\u00e0 un tractament d\u2019hidr\u00f2lisi que permetr\u00e0 extreure nanocristalls de cel\u00b7lulosa, als quals s\\’acoblaran, als extrems, pol\u00edmers funcionals sint\u00e8tics. Aquests nanocristalls modificats s\\’utilitzaran com a plantilla per fabricar metamaterials met\u00e0l\u00b7lics.
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Resultats i impacte esperat<\/h4>\r
Els cristalls l\u00edquids de cel\u00b7lulosa en assecar-se, s\u00f3n capa\u00e7os d\u2019autoassemblar-se per formar estructures helicoidals. La novetat rau en el fet que ara es modificaran els extrems d\\’aquests cristalls nanom\u00e8trics per adjuntar-hi pol\u00edmers funcionals sint\u00e8tics que guiaran la formaci\u00f3 de nanohelicoides met\u00e0l\u00b7lics.\r
Com a resultat, s\u2019obtindr\u00e0 una pel\u00b7l\u00edcula que es podr\u00e0 impregnar amb metalls com l\\’or, per exemple, que quedar\u00e0 immobilitzat als extrems, on hi ha aquests pol\u00edmers funcionals. Despr\u00e9s de cristal\u00b7litzar el metall i d\\’eliminar la plantilla de cel\u00b7lulosa modificada, l\\’objectiu final \u00e9s aconseguir una estructura met\u00e0l\u00b7lica helicoidal nova, semblant a un cargol o rosca d\\’Arqu\u00edmedes, en escala nano. Aquest procediment \u00e9s pioner, ja que, fins ara, no ha estat possible fabricar estructures met\u00e0l\u00b7liques tan complexes mitjan\u00e7ant l\\’autoassemblatge.\r
L\\’estructura resultant ser\u00e0 tamb\u00e9 quiral i tindr\u00e0 propietats electromagn\u00e8tiques no observades a la natura, que milloraran la detecci\u00f3 de mol\u00e8cules quirals en diferents camps de recerca. Aix\u00ed, quan es combinin en una soluci\u00f3 d\\’estereois\u00f2mers, ho faran actuar com a vehicle de comunicaci\u00f3 entre la llum i les petites mol\u00e8cules quirals, amplificant el senyal global de la seva detecci\u00f3 en l\u2019espectrosc\u00f2pia, com el dicroisme circular.Les aplicacions finals d\\’aquests nous metamaterials van des de l\\’\u00f2ptica quiral al seu \u00fas en nanodispositius, m\u00e0quines i sensors quirals, a m\u00e9s d\\’aplicacions en els camps de la biologia o la ind\u00fastria farmac\u00e8utica. Tamb\u00e9 poden ser una base per a futurs dispositius d\\’encobriment d\\’invisibilitat i lents per a imatges de superresoluci\u00f3 en ci\u00e8ncies naturals i en l\\’\u00e0mbit m\u00e8dic.\r
A m\u00e9s, el proc\u00e9s d\\’enginyeria proposat, basat \u00fanicament en l\\’autoassemblatge, representa un canvi de paradigma en la recerca i la manufactura de metamaterials, ja que simplifica la fabricaci\u00f3 de metamaterials quirals, que actualment es basa en processos complexos i costosos a partir de la deposici\u00f3 de vapor al buit.
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Pressupost i finan\u00e7ament<\/h4>\r
CELICOIDS est\u00e0 finan\u00e7at amb prop de dos milions d\\’euros, gr\u00e0cies a un dels ajuts del Consell Europeu de Recerca (ERC, per les sigles en angl\u00e8s d\\’European Research Council), dins del programa Horizon Europe. El projecte t\u00e9 una durada de 5 anys (mar\u00e7 2023 – febrer 2028).
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El grup de recerca Polyfunctional Polymeric Materials (POLY2) de la Universitat Polit\u00e8cnica de Catalunya – BarcelonaTech (UPC) treballar\u00e0 en el projecte CELICOIDS – Nanohelicoid metamaterials templated by cellulose nanocrystals with end-tethered polymers, en el marc del qual es desenvoluparan nous metamaterials \u2212materials dissenyats per tenir una propietat que no es troba en la natura\u2212 capa\u00e7os d\u2019augmentar la sensibilitat espectrosc\u00f2pica per distingir la quiralitat molecular.<\/p>\n","protected":false},"author":5,"featured_media":22625,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":[],"portfolio-types":[998,408,1055,240],"class_list":["post-22640","portfolio","type-portfolio","status-publish","has-post-thumbnail","hentry","portfolio-types-materiales-de-frontera-ca","portfolio-types-salut","portfolio-types-sector-salut","portfolio-types-tecnologias-de-los-materiales-ca"],"yoast_head":"\nMetamaterials per detectar la quiralitat molecular - 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