A5084872602- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Liquid Crystal Research Advancements
- Photochemistry and Electron Transfer Studies
- Cultural Heritage Materials Analysis
- Porphyrin and Phthalocyanine Chemistry
- Building materials and conservation
- Conservation Techniques and Studies
- Nonlinear Optical Materials Studies
- Spectroscopy and Chemometric Analyses
- Bone Tissue Engineering Materials
- Optical Coatings and Gratings
- Mineralogy and Gemology Studies
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Research
- Surfactants and Colloidal Systems
- Glass properties and applications
- Optical Polarization and Ellipsometry
- Advanced Drug Delivery Systems
- Surface Roughness and Optical Measurements
- Polymer Surface Interaction Studies
- Electrochemical Analysis and Applications
- Electrostatics and Colloid Interactions
- Pigment Synthesis and Properties
- Solid State Laser Technologies
University of Parma
2001-2010
University of Milano-Bicocca
2009
Institute for the Dynamics of Environmental Processes
2009
European Synchrotron Radiation Facility
2008
National Interuniversity Consortium for the Physical Sciences of Matter
2005
Istituto Nazionale per la Fisica della Materia
2000-2003
Abstract Powdered pigments found in bowls from the Pompeii archaeological site and some wall‐painting fragments Vesuvian area (conserved National Archaeological Museum of Naples) were investigated by microscopic Raman FTIR spectroscopies, X‐ray diffraction scanning electron microscopy‐energy dispersive X‐ray. Brown, red yellow are common ochres based on goethite haematite. The blue pigment is Egyptian blue: presence tridymite cristobalite indicates firing temperatures 1000–1100 °C range....
In this Letter, we present a method for the decoration of layer-by-layer (LbL) structures by heavy metal ions, which allows X-ray reflectivity (XRR) measurements at solid/water interface. The improved contrast has allowed us to obtain well-structured curves from samples liquid/solid interface that can be used film structure modeling. developed technique was also follow formation complexes between DNA and LbL multilayer. XRR data are confirmed independent null-ellipsometric solid/liquid on...
The chemical properties of Disperse Red 1 (DR1), a dye molecule commonly used as an active guest thin silica or ORMOSILs films for optical applications, were investigated by micro-Raman spectroscopy. influence the acid catalyst was studied in DR1 + TEOS (tetraethyl orthosilicate), GLYMO (3-glycidoxypropyltrimethoxysilane) and ICPTEOS [3-(triethoxysilyl)propyl isocyanate] sol–gel starting solutions on corresponding bulk glasses. A protonated form found some glasses, its Raman spectrum is...
Polarization holographic gratings in sp configuration are written at 488 nm photorefractive organic–inorganic films based on SiO2 . The films, prepared by a solgel technique, contain Disperse Red 1, carbazole units, and 2, 4, 7-trinitro-9-fluorenone. characterized their diffraction efficiency for 632.8-nm probe. polarization act as half-wave plate, the is independent of direction
The mechanism of photoinduced anisotropy through photoisomerization has been studied by measuring dichroism and birefringence in solgel silica-based glasses containing an azo dye (Disperse Red 1) a plasticizer (carbazole). equations commonly adopted to describe the molecular orientation (Sekkat's theory) have solved numerically analytically within two different approximations. results applied measured with expanded beams, dominant mechanisms driving azo-dye investigated materials during both...
A fast method to obtain the molar composition of garnets starting from their Raman spectra was recently proposed. The method, called MIRAGEM—MIcro‐RAman Garnets Evaluation Method is based on assumption that in a garnet solid‐solution wavenumbers are linear combinations end‐member wavenumbers, weighted by fraction. In this work, application MIRAGEM belonging ugrandite family discussed detail, showing very good correspondence with electron‐microscope‐microprobe results grossular‐andradite...
A micro-Raman investigation on four wooden polychrome sculptures of Jan Geernaert (1704-1777), a Flemish sculptor who worked in Italy the 18th century, is presented. The statues, representing Holy Virgin Mary, with infant Jesus three them, were created period 1750-1770 and are all made by poplar wood. purpose investigations was to identify original pigments used after later repainting interventions. In wood covered groundwork, gypsum animal glue. All identified, both pictorial cover or...
The implantation of controlled drug release devices represents a new strategy in the treatment neurodegenerative disorders. Sol-gel titania implants filled with valproic acid, have been used for this purpose to treat induced epilepsy rats. kinetics depend on: (a) porosity, (b) chemical interactions between acid and surface hydroxyl groups titania, (c) particle size, (d) size agglomerates. concentration water hydrolysis reaction is an important variable degree hydroxylation, structural...
The photoinduced optical retardation in mesostructured polymeric materials containing photo-orientable dyes has been investigated as a function of time and pump irradiance by an imaging pump-probe technique. samples show higher maximum lower residual anisotropy than amorphous ones. Several hypotheses are made to explain both results, taking into account the influence mesostructures on chromophores. retardation-irradiance curves measured different fitted against current available models.
Abstract Polymeric films (low‐density polyethylene and oriented polypropylene) for packaging applications coated with organic–inorganic nanocomposite hybrids have been prepared by sol‐gel process. Tetraethoxysilane two different organic phases, polyvinyl alcohol a diblock copolymer polyethylene‐polyethylene glycol were used as precursors. Information about the hydrolysis polycondensation degrees was obtained investigating vibrational features of coatings means attenuated total...