Descrizione del progetto
Metamateriali avanzati
I metamateriali sono materiali compositi concepiti e fabbricati in modo artificiale a partire da unità dotate di proprietà e funzioni specifiche. Queste microstrutture interne e la loro disposizione secondo geometrie specifiche offrono ai metamateriali capacità che i materiali naturali non possono possedere. Finanziato dal Consiglio europeo della ricerca, il progetto CELICOIDS si propone di sviluppare metamateriali chirali privi di simmetria speculare, ma in grado di far ruotare onde elettromagnetiche. Tali materiali auto assemblati risultano di particolare interesse per la chimica analitica e la biologia. I ricercatori utilizzeranno nanocristalli di cellulosa come piattaforma per generarli e renderli funzionali ai fini di ulteriori applicazioni.
Obiettivo
Chirality plays a fundamental role in natural sciences and pharmacology. The ability to detect chiral molecules relies heavily on inherently weak circularly polarized light-matter interactions. Such interactions are enhanced in the presence of chiral metamaterials, which exhibit extraordinary electromagnetic properties not observed in nature. To date, large and broadband circular dichroism in the UV-visible spectrum requires arrays of metallic nanohelices in order to combine internal and Bragg resonances. However, their fabrication relies on costly electron/ion beam lithography or physical vapor deposition, in which it is difficult and time-consuming to control nanoscale morphology over large areas. New types of helix metamaterials and engineering processes based on self-assembly concepts are absolutely necessary in order to be viable for future technologies. Nevertheless, self-assembled metamaterials with large, broadband and tunable chiroptical responses in the UV-visible region is a great challenge due to the required subwavelength feature sizes. To this end, the helicoidal morphologies of chiral liquid crystals provide the ideal platform for maximizing chiral light-matter interactions. The objective of CELICOIDS is to investigate the use of the chiral liquid crystal phases of cellulose nanocrystals with end-tethered polyoxyethylene analogues as templates for the fabrication of a new class of metamaterial, solid metallic nanohelicoids. A recent breakthrough that now makes this project possible is the discovery that such cellulose nanocrystal hybrids form chiral liquid crystal phases. As one of the very few researchers in the world with the combined expertise in cellulose chemistry, polymer grafting and colloidal assembly, I am the ideal candidate to achieve success. New functionalities are envisioned thereafter, applicable to future devices for invisibility cloaking, super-resolution imaging and chiral sensing, prompting a change in paradigm in metamaterials.
Campo scientifico
- natural sciencesphysical sciencesopticsmicroscopysuper resolution microscopy
- natural scienceschemical sciencespolymer sciences
- engineering and technologynanotechnologynano-materialsnanocrystals
- medical and health sciencesbasic medicinepharmacology and pharmacy
- engineering and technologymaterials engineeringliquid crystals
Parole chiave
Programma(i)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Argomento(i)
Meccanismo di finanziamento
ERC - Support for frontier research (ERC)Istituzione ospitante
08034 Barcelona
Spagna