145 research outputs found

    Colloidal CuFeS2 Nanocrystals: Intermediate Fe d-Band Leads to High Photothermal Conversion Efficiency

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    We describe the colloidal hot-injection synthesis of phase-pure nanocrystals (NCs) of a highly abundant mineral, chalcopyrite (CuFeS2). Absorption bands centered at around 480 and 950 nm, spanning almost the entire visible and near infrared regions, encompass their optical extinction characteristics. These peaks are ascribable to electronic transitions from the valence band (VB) to the empty intermediate band (IB), located in the fundamental gap and mainly composed of Fe 3d orbitals. Laser-irradiation (at 808 nm) of an aqueous suspension of CuFeS2 NCs exhibited significant heating, with a photothermal conversion efficiency of 49%. Such efficient heating is ascribable to the carrier relaxation within the broad IB band (owing to the indirect VB-IB gap), as corroborated by transient absorption measurements. The intense absorption and high photothermal transduction efficiency (PTE) of these NCs in the so-called biological window (650-900 nm) makes them suitable for photothermal therapy as demonstrated by tumor cell annihilation upon laser irradiation. The otherwise harmless nature of these NCs in dark conditions was confirmed by in vitro toxicity tests on two different cell lines. The presence of the deep Fe levels constituting the IB is the origin of such enhanced PTE, which can be used to design other high performing NC photothermal agents.Comment: 12 pages, Chemistry of Materials, 31-May-201

    Collezionismo e identit\ue0: il caso Campori. Retaggio medievalista e continuit\ue0 del patriziato modenese

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    Collezioni, musei, identit\ue0 costituiscono tre facce del prisma del patrimonio culturale, colto nella sua fase di formazione fra Settecento e Novecento: il prodotto dell'incontro fra un bene storico-artistico e un particolare investimento simbolico compiuto da una comunit\ue

    Proposte per un'articolazione editoriale delle Lettere del Guarini

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    La relazione svolge una ricognizione sulla questione ecdotica delle Lettere del Guarini e propone soluzioni editoriali

    Dare una storia della pittura alla patria: Giuseppe Campori fra Risorgimento, erudizione e collezionismo

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    interventi dedicati al rapporto fra la scrittura e l'immagine nella ricognizione della memoria storica storica risorgimentale, alla ricerca dell'identit\ue0 nazional
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