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286 results on '"Gruttadauria, M"'

7. Elettrodeposizione di bitiofene fulleropirrolidina per la realizzazione di sensori piezoresistivi

Author

Chiappara, C., Arrabito, G., Campisciano V., Errico, V., Saggio, M., Gruttadauria, M., Giacalone, F., Scopelliti, M., Pignataro, B., Chiappara, C., Arrabito, G., Campisciano V., Errico, V., Saggio, M., Gruttadauria, M., Giacalone, F., Scopelliti, M., and Pignataro, B.

Subjects
elettrochimica, sensori piezoresistivi, Settore CHIM/01 - Chimica Analitica, elettropolimerizzazione
Abstract

Un nuovo sistema donatore-accettore bisaddotto bitiofene fulleropirrolidi na (bis-C60Bi) è stato elettropolimerizzato su ITO/PET(ossido di Indio-Sta gno)/PoliEtilene Tereftalato per cronoamperometria. E’ stato applicato un potenziale anodico di 1.5V alla soluzione di monomero per un certo tempo ¿QR DOO¶RWWHQLPHQWR GL XQ ¿OP VRWWLOH SROLPHULFR VXO VXEVWUDWR &DUDWWHUL]]D zioni XPS, UV-vis hanno confermato la presenza del polimero sull’elettrodo. ...

Published
2019

10. Tuneable Emission of Polyhedral Oligomeric Silsesquioxane Based Nanostructures that Self-Assemble in the Presence of Europium(III) Ions: Reversible trans-to-cis Isomerization

Author

Cinà, V., Carbonell, Esther, Fusaro, L., García Gómez, Hermenegildo, Gruttadauria, M., Giacalone, F., Aprile, C., Cinà, V., Carbonell, Esther, Fusaro, L., García Gómez, Hermenegildo, Gruttadauria, M., Giacalone, F., and Aprile, C.

Abstract

Hybrid nanostructures with switchable and reversible “blue-red-green” emission were efficiently synthesized. These nanostructures comprise polyhedral oligomeric silsesquioxanes (POSS) that behave as a nanocage that can be functionalized with terpyridine-based organic ligands, which can be easily complexed with europium (III) ions. The complexes were characterized by UV-Vis and fluorescence spectroscopy and their stoichiometry was also confirmed by H NMR spectroscopy. In the presence of the Eu(III) ions, the octafunctionalized nanocages self-assemble to form 3D architectures that display an intense red-emission, especially in the solid state. The presence of an alkenyl group bridging the inorganic core to the organic moiety was employed to tune the emission properties by trans-cis isomerization of the double bond. In the case of the octafunctionalized nanocages (O-POSS), this isomerization was monitored in the presence of Eu(III) cations and was accompanied by an evident colour change from blue (trans-O-POSS) to red (Eu@trans-O-POSS) and finally to green (cis-O-POSS) as consequence of the release of the metal cations. This behaviour, together with the easy dispersion of the dry powder and the possibility of coating as a film in presence of small amounts of solvent, makes the emissive solid promising for applications in materials science.

Published
2019

13. Lipase-catalyzed resolution of anti-substituted 1,3-dioxepan-5-ols

Author

Gruttadauria, M., LO MEO, P., Riela, S., Giacalone, F., Noto, R., GRUTTADAURIA M, LO MEO P, RIELA S, GIACALONE F, and NOTO R

Subjects
Settore CHIM/06 - Chimica Organica, lipase, stereoselective reaction, 1,3-dioxepan-5-ols
Abstract

Several anti-6-substituted 1,3-dioxepan-5-ols were kinetically resolved using an immobilized lipase (Amano PS–C II) in toluene in the presence of vinyl acetate at 30 C. This approach provided, in some cases, the alcohol and the acetate in high enantiomeric purity, depending on the nature of the substituent (R = N3, SePh, I, OBn) and the acetal group (unsubstituted or dimethyl). The role of the size of substituents is also discussed. Enantiopure anti-6-substituted 1,3-dioxepan-5-ols are useful building blocks.

Published
2006

40. Site-specific halloysite functionalization by polydopamine: A new synthetic route for potential near infrared-activated delivery system

Author

Maria Laura Alfieri, Leonarda F. Liotta, Noemi Gallucci, Serena Riela, Michelangelo Gruttadauria, Gerardino D'Errico, Mariano Licciardi, Gianfranco Sfuncia, Giuseppe Nicotra, Marina Massaro, Marco d'Ischia, Alfieri M.L., Massaro M., d'Ischia M., D'Errico G., Gallucci N., Gruttadauria M., Licciardi M., Liotta L.F., Nicotra G., Sfuncia G., Riela S., Alfieri, Ml, Massaro, M, D'Ischia, M, D'Errico, G, Gallucci, N, Gruttadauria, M, Licciardi, M, Liotta, Lf, Nicotra, G, Sfuncia, G, and Riela, S

Subjects
Hyperthermia effect, Polydopamine, Indoles, Materials science, Polymers, Halloysite nanotube, Nanotechnology, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Halloysite, Nanomaterials, Biomaterials, Colloid and Surface Chemistry, Coating, Secondary modification, Delivery system, Nanotubes, Aqueous solution, Site-specific functionalization, biology, Halloysite nanotubes, Hyperthermia effects, 021001 nanoscience & nanotechnology, Grafting, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Polymerization, Biotin-avidin interaction, biology.protein, engineering, Clay, Surface modification, 0210 nano-technology, Avidin
Abstract

Halloysite nanotubes (HNTs) represent a versatile core structure for the design of functional nanosystems of biomedical interest. However, the development of selective methodologies for the site-controlled functionalization of the nanotubes at specific sites is not an easy task. This study aims to accomplish a procedure for the site-selective/specific, “pin-point”, functionalization of HNTs with polydopamine (HNTs@PDA). This goal was achieved, at pH 6.5, by exploiting the basicity of ZnO nanoparticles anchored on the HNTs external surface (HNTs@ZnO) to induce a punctual polydopamine polymerization and coating. The morphology and the chemical composition of the nanomaterial was demonstrated by several techniques. Turbidimetric analysis showed that PDA coating affected the aqueous stability of HNTs@PDA compared to both HNTs@ZnO and HNTs. Notably, hyperthermia studies revealed that the nanomaterial induced a local thermic rise, up to 50 °C, under near-infrared (NIR) irradiation. Furthermore, secondary functionalization of HNTs@PDA by selective grafting of biotin onto the PDA coating followed by avidin binding was also accomplished.

Published
2022

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