1,720,976 research outputs found
Reseda luteola L. : Characterization of the plant extract for the identification of compounds involved in the preparation oflake pigments and in dyeing processes
No full textNanocellulose based materials for cultural heritage: wood and textile applications
No full textNowadays, nanotechnology offers new means for the consolidation of historical papers, ancient woods and textile materials from natural fibers. Among the most promising materials that are widely used in this area are those based on crystalline nanocellulose (CNC). The application of these new materials in Cultural Heritage field is the subject of the research work presented here, that will constitute a Master's Degree Thesis in Nanotechnology Engineering, coordinated by Prof. Mattiello (Sapienza University of Rome), Prof. Graiff (University of Parma) and Dr. Morresi (Vatican Museums Diagnostic Laboratory for Conservation and Restoration)
Restauro delle strutture murarie del mausoleo alfa lungo la via Clodia nell’area extraterritoriale di Santa Maria di Galeria, Città del Vaticano
No full textProgetto definitivo ed esecutivo. Committente: Musei Vaticani, Città del Vaticano; Responsabili scientifici: dott. G. Filippi (Musei Vaticani), E. Pallottino (Dipartimento di Architettura); responsabili della progettazione e coordinatori dell'esecuzione: L. De Blasi (archeologo; Musei Vaticani), G. Devreux (responsabile del Laboratorio Restauro Marmi e Calchi dei Musei Vaticani), P. Porretta (architetto, Roma Tre), E. Rinaldi (archeologo, Roma Tre), U. Santamaria (responsabile del Laboratorio di Diagnostica per la Conservazione ed il Restauro); gruppo di progettazione: G. Ajo’, S. Calvigioni, C. Maestri, M. Magazzù, M. Fadd
Restauro delle strutture murarie del mausoleo beta lungo la via Clodia nell’area extraterritoriale di Santa Maria di Galeria, Città del Vaticano
No full textProgetto definitivo ed esecutivo. Committente: Musei Vaticani, Città del Vaticano; Responsabili scientifici: dott. G. Filippi (Musei Vaticani), E. Pallottino (Dipartimento di Architettura); responsabili della progettazione e coordinatori dell'esecuzione: L. De Blasi (archeologo; Musei Vaticani), G. Devreux (responsabile del Laboratorio Restauro Marmi e Calchi dei Musei Vaticani), P. Porretta (architetto, Roma Tre), U. Santamaria (responsabile del Laboratorio di Diagnostica per la Conservazione ed il Restauro); gruppo di progettazione: I. Ameli, E. Antonucci, G. Bracq, A. Miranti, A. Moscone, L.F. Pan
Identification of organic compound in polychrome works of art by micro-sampling with Ag-gel matrix associated with SERS analysis
No full textStudy of the effect of protective on wood photo-degradation by colour measurements, FT-IR spectroscopy and hyperspectral imaging
No full textThe aim of this work is to investigate the effect of protective materials on poplar (Populus spp.) wood modifications as consequence of artificial photo-degradation in controlled environment. Starting from previous results [1-4], this study tried to understand what happens to wood surface under the protective layer.
As protective materials, shellac, beeswax and Linfoil® were tested to compare traditional and novel products generally used for wood. The samples covered by these protective layers were artificially aged in Solar Box for 1064 hours. As comparison, also uncovered samples were tested.
At chosen times, the samples were investigated by reflectance spectrophotometry, Fourier transform infrared spectroscopy and hyperspectral imaging in order to study the colour and chemical modification occurred to wood both covered and uncovered with the protective products. The obtained data were statistically elaborated in order to verify their significance.
Colour measurements highlighted that the protective materials reduced the wood colour changes in respect to un-protected samples. FT-IR spectroscopy demonstrated that photo-degradation caused mainly lignin decomposition with the production of new chromophore groups on wood surface. Also in this case un-covered wood underwent greater modifications in respect to protected one. Hyperspectral imaging in the SWIR range (1000-2500 nm), coupled with chemometric methods, clearly showed the variation between the spectral behavior of poplar wood for ageing time 0 and 1064 hours, with different protective layers.
It is interesting to note that protective materials have a partial effect on wood photo-degradation by little reducing the changes.
Such results can contribute to evaluate the effect of protective materials on wood during sun exposure
Hyperspectral imaging as a technique for investigating the effect of consolidating materials on wood
No full textThe focus of this study was to investigate the potential of hyperspectral imaging (HSI) in the monitoring
of commercial consolidant products applied on wood samples. Poplar (Populus spp.) and walnut (Juglans
Regia L.) were chosen for the consolidant application. Both traditional and innovative products were selected,
based on acrylic, epoxy, and aliphatic compounds. Wood samples were stressed by freeze/thaw cycles in order
to cause material degradation without the loss of wood components. Then the consolidant was applied under
vacuum. The samples were finally artificially aged for 168 h in a solar box chamber. The samples were acquired
in the short wave infrared (1000 to 2500 nm) range by SISUChema XLTMdevice (Specim, Finland) after 168 h of
irradiation. As comparison, color measurement was also used as an economic, simple, and noninvasive technique
to evaluate the deterioration and consolidation effects on wood. All data were then processed adopting a
chemometric approach finalized to define correlation models, HSI based, between consolidating materials, wood
species, and short-time aging effects
X-ray fluorescence investigation on yellow pigments based on lead, tin and antimony through the comparison between laboratory and portable instruments
No full texttThis paper presents an investigation of yellow pigments based on lead, tin and antimony through X-rayfluorescence spectroscopy with the aim of comparing portable and laboratory instruments and discussingthe potential application on artworks. Artificial yellow pigments, based on Pb-Sb-Sn, and produced inour laboratory, were chosen in order to have a well-known and already characterized sample set. Thedifferentiation in artworks of these pigments is still a challenge if non-invasive portable X-ray spectro-meters are used, as commonly occurs in practice. The analysis was performed by using the Bruker M4Tornado laboratory equipment and the Assing Surface Monitor II portable apparatus. Scanning electronmicroscopy with energy dispersive spectroscopy was also applied for a semi-quantitative analysis ofthe chosen pigments. In order to perform a significant statistical comparison of acquired and processeddata, all the analyses have been carried out by using the same sample, the same acquisition set-up and,at the same time, operative conditions for both instruments. A chemometric approach, based on theprincipal component analysis and multivariate analytical tools, was applied in order to verify the spec-tral differences, and related informative content, between the different produced yellow pigments. Themultivariate approach revealed instrumental differences between the two systems and allowed the com-parison of the common characteristics of the analyzed pigments set. The potential of this new approachis also linked to the possibility of differentiating artificial yellow pigments, both in terms of compositionand, above all, in terms of recipes for their production
- …
