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37 results on '"Vincenti, Maria Aurora"'

1. PNIPAM microgel coatings of LiF crystal radiation detectors

Author

Nigro, Valentina, Colantonio, Claudia, Piccinini, Massimo, Buratti, Elena, Ciciotti, Riccardo, Cisbani, Evaristo, Angelis, Cinzia De, Dinelli, Franco, Esposito, Giuseppe, Limosani, Francesca, Nichelatti, Enrico, Ronsivalle, Concetta, Vincenti, Maria Aurora, Ruzicka, Barbara, and Montereali, Rosa Maria

Published
2024
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11. Influence of a Solid Surface on PNIPAM Microgel Films.

Author

Nigro, Valentina, Angelini, Roberta, Buratti, Elena, Colantonio, Claudia, D'Amato, Rosaria, Dinelli, Franco, Franco, Silvia, Limosani, Francesca, Montereali, Rosa Maria, Nichelatti, Enrico, Piccinini, Massimo, Vincenti, Maria Aurora, and Ruzicka, Barbara

Subjects
MICROGELS, ATOMIC force microscopy, THIN films, ELECTROSTATIC interaction, CELL growth
Abstract

Stimuli-responsive microgels have attracted great interest in recent years as building blocks for fabricating smart surfaces with many technological applications. In particular, PNIPAM microgels are promising candidates for creating thermo-responsive scaffolds to control cell growth and detachment via temperature stimuli. In this framework, understanding the influence of the solid substrate is critical for tailoring microgel coatings to specific applications. The surface modification of the substrate is a winning strategy used to manage microgel–substrate interactions. To control the spreading of microgel particles on a solid surface, glass substrates are coated with a PEI or an APTES layer to improve surface hydrophobicity and add positive charges on the interface. A systematic investigation of PNIPAM microgels spin-coated through a double-step deposition protocol on pristine glass and on functionalised glasses was performed by combining wettability measurements and Atomic Force Microscopy. The greater flattening of microgel particles on less hydrophilic substrates can be explained as a consequence of the reduced shielding of the water–substrate interactions that favors electrostatic interactions between microgels and the substrate. This approach allows the yielding of effective control on microgel coatings that will help to unlock new possibilities for their application in biomedical devices, sensors, or responsive surfaces. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Visible Radiophotoluminescence of Color Centers in Lithium Fluoride Thin Films for High Spatial Resolution Imaging Detectors for Hard X-rays

Author

Vincenti, Maria Aurora, primary, Nichelatti, Enrico, additional, Nigro, Valentina, additional, Piccinini, Massimo, additional, Albertazzi, Bruno, additional, Benkadoum, Yaniss, additional, Dabrowski, Hannibal, additional, Koenig, Michel, additional, Rigon, Gabriel, additional, Mabey, Paul, additional, Mercere, Pascal, additional, Da Silva, Paulo, additional, Pikuz, Tatiana, additional, Ozaki, Norimasa, additional, Filippov, Evgeny, additional, Makarov, Sergey, additional, Pikuz, Sergey, additional, and Montereali, Rosa Maria, additional

Published
2023
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15. Posters

Author

Atanassov, A., Zlateva, G., Baleva, M., Wischmeier, Lars, Bekeny, Chegnui, Voss, Tobias, Popescu, Alexandru, Walldorf, Daniel, Schorstein, Kai, Walther, Thomas, Marinova, M., Gnoli, Andrea, Righini, Marcofabio, Vredenborg, Arno, Roeterdink, Wim G., Janssen, Maurice H. M., Salumbides, E., Hannemann, S., Reinhold, E., Labazan, I., Witte, S., Zinkstok, R., Eikema, K., Ubachs, W., Goc, Jacek P., Bartczak, Adam, Zaparucha, Marek, Trojan-Piegza, J., Zych, E., Niittykoski, J., Hölsa, J., Davydenko, L., Babich, I., Plyuto, Y., van Langeveld, A. D., Moulijn, J. A., Gawelda, W., Sobanek, B., Pham, V. T., Kaiser, M., Zaushitsyn, Y., Tarnovsky, A., Grolimund, D., Johnson, S. L., Abela, R., Chergui, M., Bressler, C., Pazik, R., Hreniak, D., Strek, W., Speghini, A., Bettinelli, M., Blanco, V. Diez, Siegel, J., Solis, J., Bonacina, L., Larrégaray, P., van Mourik, F., Troncale, V., Seliuta, D., Goncharova, Olga, Gaspar de Oliveira, Cristina, Coelho de Oliveira, Paulo, de Oliveira, Cristina Gaspar, Almaviva, Salvatore, Baldacchini, Giuseppe, Bonfigli, Francesca, Montereali, Rosa Maria, Vincenti, Maria Aurora, van der Sneppen, Lineke, Carey, James, Tull, Brian, Sheehy, Michael, Diebold, Eric, Mazur, Eric, Di Bartolo, Baldassare, editor, and Forte, Ottavio, editor

Published
2006
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21. Photo-induced gratings in thin color center layers on lithium fluoride

Author

Bonfigli, Francesca, Vincenti, Maria Aurora, Almaviva, Salvatore, Montereali, Rosa Maria, Nichelatti, Enrico, Nogueira, Rogerio N., and Kalinowski, Hypolito Jose

Subjects
Lithium compounds -- Optical properties, Fluorine compounds -- Optical properties, Diffraction gratings -- Observations, Astronomy, Physics
Abstract

We study the recording of permanent Bragg gratings on surface-colored lithium fluoride (LiF) crystals by using the interference pattern of a continuous-wave UV argon-ion laser operating at 244 nm. Gratings with spatial periodicity ranging from 400 to 1000 nm are written by using a phase-mask interferometer and are stable for several months after the writing process. Absorption and photoluminescence spectra show the bleaching of primary F and F -aggregate laser-active color centers as a result of the process. Confocal microscopy is used to determine the pitch and the profile of the fluorescent gratings. The UV laser-induced optical bleaching in highly colored LiF ultrathin layers is responsible for the periodic spatial modulation of absorption and photoemission properties that characterize the gratings. In the colored surface layer, a reduction of as much as 50% of the initial color-center-induced refractive-index increase has been estimated in the bleached areas. OCIS codes: 050.2770, 140.3380, 140.1700, 230.4000.

Published
2009

28. X‐ray microscopy of plant cells by using LiF crystal as a detector

Author

Reale, Lucia, primary, Bonfigli, Francesca, additional, Lai, Antonia, additional, Flora, Francesco, additional, Poma, Anna, additional, Albertano, Patrizia, additional, Bellezza, Simona, additional, Montereali, Rosa Maria, additional, Faenov, Anatoly, additional, Pikuz, Tania, additional, Almaviva, Salvatore, additional, Vincenti, Maria Aurora, additional, Francucci, Massimo, additional, Gaudio, Pasqualino, additional, Martellucci, Sergio, additional, and Richetta, Maria, additional

Published
2008
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30. Colour Centre Bragg Grating Recording in Lithium Fluoride Thin Layers

Author

Bonfigli, Francesca, primary, Vincenti, Maria Aurora, additional, Almaviva, Salvatore, additional, Montereali, Rosa Maria, additional, Nichelatti, Enrico, additional, Kalinowski, Hypolito José, additional, Nogueira, Rogério N., additional, Wetter, Niklaus Ursus, additional, and Frejlich, Jaime, additional

Published
2008
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31. High‐resolution water window X‐ray imaging of in vivo cells and their products using LiF crystal detectors

Author

Bonfigli, Francesca, primary, Faenov, Anatoly, additional, Flora, Francesco, additional, Francucci, Massimo, additional, Gaudio, Pasqualino, additional, Lai, Antonia, additional, Martellucci, Sergio, additional, Montereali, Rosa Maria, additional, Pikuz, Tania, additional, Reale, Lucia, additional, Richetta, Maria, additional, Vincenti, Maria Aurora, additional, and Baldacchini, Giuseppe, additional

Published
2007
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35. High-resolution water window X-ray imaging of in vivo cells and their products using LiF crystal detectors.

Author

Bonfigli, Francesca, Faenov, Anatoly, Flora, Francesco, Francucci, Massimo, Gaudio, Pasqualino, Lai, Antonia, Martellucci, Sergio, Montereali, Rosa Maria, Pikuz, Tania, Reale, Lucia, Richetta, Maria, Vincenti, Maria Aurora, and Baldacchini, Giuseppe

Abstract

High contrast imaging of in vivo Chlorella sorokiniana cells with submicron spatial resolution was obtained with a contact water window X-ray microscopy technique using a point-like, laser-plasma produced, water-window X-ray radiation source, and LiF crystals as detectors. This novel type of X-ray imaging detectors is based on photoluminescence of stable electronic point defects, characterized by high intrinsic resolution. The fluorescence images obtained on LiF crystals exposed in single-shot experiments demonstrate the high sensitivity and dynamic range of this new detector. The powerful performances of LiF crystals allowed us to detect the exudates of Chlorella cells in their living medium and their spatial distribution in situ , without any special sample preparation. Microsc. Res. Tech., 2008. © 2007 Wiley-Liss, Inc. [ABSTRACT FROM AUTHOR]

Published
2008
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36. Photoluminescent Color-Center Based Lithium Fluoride Radiation Detectors for Proton Beam Diagnostics

Author

Piccinini, Massimo, Ampollini, Alessandro, Picardi, Luigi, Ronsivalle, Concetta, Vadrucci, Monia, Bonfigli, Francesca, Libera, Stefano, Nichelatti, Enrico, Vincenti, Maria Aurora, and Montereali, Rosa Maria

Abstract

Lithium fluoride (LiF) is a well-known dosimeter material and is sensitive to any kind of ionizing radiation. A linear accelerator for protontherapy under development at ENEA C.R. Frascati was used to irradiate LiF crystals and thin films at room temperature with proton beams of 3 and 7 MeV energy in a dose range from 103 to 107 Gy. The irradiation of LiF induced the formation of stable F2 and F3+ color centers (CCs), which emit with broad photoluminescence (PL) bands under optical pumping at wavelengths close to 450 nm. By acquiring the PL image of the irradiated spots with a conventional fluorescence microscope, the transversal proton beam intensity was mapped with a high spatial resolution. The integrated PL intensity was also measured as a function of the irradiation dose: LiF films showed a linear PL response extending over three orders of magnitude of dose range, independently on the beam energy. It was also possible to measure the CCs PL distribution with proton penetration depth and direct imaging the Bragg peak, which gives an estimation of the proton beam energy. The sensitivity of the optical reading techniques and the high emission efficiency of CCs provided encouraging results to use photoluminescent color-center LiF-based radiation detectors for proton beam dosimetry and imaging applications.

Published
2006
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37. Versatile Lithium Fluoride Luminescent Detectors for High Resolution Imaging Applications from Extreme Ultraviolet to Soft and Hard X-Rays

Author

Bonfigli, Francesca, Nichelatti, Enrico, Vincenti, Maria Aurora, and Montereali, Rosa Maria

Abstract

X-ray imaging represents a very relevant tool in basic and applied research fields due to the possibility of performing non-destructive investigations with high spatial resolution. We present innovative X-ray imaging detectors based on visible photoluminescence from aggregate electronic defects locally created in lithium fluoride (LiF) during irradiation. Among the peculiarities of these detectors, noteworthy ones are their very high spatial resolution (intrinsic ∼2 nm, standard ∼300 nm) across a large field of view (>10 cm2), wide dynamic range (>103) and their insensitivity to ambient light. The material photoluminescence response can be enhanced through the proper choice of reflecting substrates and multi-layer designs in the case of LiF films. The present investigation deals with the most appealing X-ray imaging applications, from simple lensless imaging configurations with commonly-available laboratory polychromatic X-ray sources to X-ray imaging-dedicated synchrotron beamlines in absorption and phase contrast experiments.

Published
2006
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