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J Am Chem Soc, 1981
for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.... more for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.58 mg of an orange solid. The solid was vacuum sublimed to give 0.050 g (0.16 mmol,87oPA) Of CWsWne (CO)&lnI (IR (hexane, cm-') 2131 (W), 2050 (S), f2oO9 (m)) which was identical with an authentic sample30 by TLC. Acknowledgment. We warmly thank the National (30) Quick, M. H.; Angelici, R.
Organometallics, 1982
for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.... more for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.58 mg of an orange solid. The solid was vacuum sublimed to give 0.050 g (0.16 mmol,87oPA) Of CWsWne (CO)&lnI (IR (hexane, cm-') 2131 (W), 2050 (S), f2oO9 (m)) which was identical with an authentic sample30 by TLC. Acknowledgment. We warmly thank the National (30) Quick, M. H.; Angelici, R.
Organometallics, 1992
The electronic structures of a series of closely related U(ηâµ-CâHâ)âL (L = -CHâ, -NHâ, -BHâ, -... more The electronic structures of a series of closely related U(ηâµ-CâHâ)âL (L = -CHâ, -NHâ, -BHâ, - NCS) complexes has been studied using the SCF Hartree-Fock-Slater first-principles discrete variational Xα method in combination with HeI and HeII UV photoelectron spectroscopy. The theoretical results reproduce the experimental HeI and He II photoelectron spectroscopic data, thus providing a reliable description of the metal-ligand
The question of the surface chemical composition of a series of nummi, having typology, mints and... more The question of the surface chemical composition of a series of nummi, having typology, mints and periods overlapping with those of the Misurata treasure, has been investigated. SEM/EDX and XPS measurements showed different silver plating techniques used in silvering the coins. A small cluster of coins was silvered by the technique of amalgam while an other cluster of coins did not show any content of mercury demonstrating so the use of different plating methods. As well as the segregation technique that was probably in some case used, a red-ox method involving the bronze coin surface with silver ammonia complexes is here proposed. The silver complexes were probably obtained by mixing chlorargyrite (a natural silver ore) powder with fermented urine that contains big quantity of ammonia due to the decomposition of urea. A series of experiments has shown the simplicity and the validity of the proposed method.
Journal of the Chemical Society, Perkin Transactions 2, 1980
ABSTRACT
Journal of the Chemical Society, Dalton Transactions, 1979
ABSTRACT
Spectrochimica Acta Part A: Molecular Spectroscopy, 1981
ABSTRACT
Geosciences, 2013
The conservation of the historic stone heritage has great importance when this material character... more The conservation of the historic stone heritage has great importance when this material characterizes the image of a city, as it happens in Syracuse (Sicily). Its historical buildings are afflicted by a heavy state of deterioration due to the particular microclimate, to pollution and to neglect endured over time. This article reports the investigations made on limestone samples from historic façades of the city and from the neighboring quarries still in operation, in order to understand the petrographic typology, the reaction to the degradation over time, the possible maintenance and recovery interventions, and the correct applications in buildings of new construction. For this aim, bulk and surface analysis have been made both on the quarry materials and on the corresponding aged materials. It is therefore possible to define the types of rock most suitable for the use in contemporary architecture guaranteeing criteria of perfect biocompatibility. In this way a natural material can be employed in traditional and innovative uses and ensure both the sustainability of the interventions and the continuity of a consolidated tradition.
Journal of Molecular Structure: THEOCHEM, 1981
Procedia Chemistry, 2013
ABSTRACT The microanalytical characterization of several motion-picture film samples of different... more ABSTRACT The microanalytical characterization of several motion-picture film samples of different support layers (cellulose nitrate, cellulose acetate and polyester) is presented. The goal of the work is to provide, by performing analyses and collecting data, a clear picture in order to better define the nature of the samples, their morphology, and any forms of degradation, by focusing on the causes and the mechanisms of weathering. To achieve these purposes several microanalitical techniques were used. (C) 2013 The Authors. Published by Elsevier B.V.
Procedia Chemistry, 2013
The debate on graphic vandalism is recent in Italy and there are few comprehensive studies on thi... more The debate on graphic vandalism is recent in Italy and there are few comprehensive studies on this subject. The graffitism is not only an aesthetic damage but a serious and irreversible degradation of the stone, by altering its state of preservation in a irreversible way. This work approaches the graphic vandalism by following two routes: a) the micro analytical study of the interaction of spray varnishes with some stone samples (obtained from Ragusa and Palazzolo (Sicily) lythothypes) and with real stone samples (coming from historical buildings sited in Ortigia-Syracuse); b) the testing of the effectiveness and efficiency of some commercial products used to remove the varnish constituents from some stone specimens, by checking the presence of residues onto the analyzed surfaces. In both cases, several micro analytical techniques were used.
Journal of the Chemical Society, Dalton Transactions, 1980
ABSTRACT
The Journal of Physical Chemistry C, 2014
ABSTRACT ZnO nanorods (NRs) grown by chem. bath deposition (CBD) are among the most promising sem... more ABSTRACT ZnO nanorods (NRs) grown by chem. bath deposition (CBD) are among the most promising semiconducting nanostructures currently investigated for a variety of applications. Still, contrasting exptl. results appear in the literature on the microscopic mechanisms leading to high aspect ratio and vertically aligned ZnO NRs. Here, we report on CBD of ZnO NRs using Zn nitrate salt and hexamethylenetetramine (HMTA), evidencing a double role of HMTA in the NRs growth mechanism. Beyond the well-established pH buffering activity, HMTA is shown to introduce a strong steric hindrance effect, biasing growth along the c-axis and ensuring the vertical arrangement. This twofold function of HMTA should be taken into account for avoiding detrimental phenomena such as merging or suppression of NRs, which occur at low HMTA concn.
2011 International Students and Young Scientists Workshop "Photonics and Microsystems", 2011
ABSTRACT Undoped and doped TiO2 nanoparticles were prepared from titanium tetraisopropoxide hydro... more ABSTRACT Undoped and doped TiO2 nanoparticles were prepared from titanium tetraisopropoxide hydrolysis using sol-gel method. TiO2 nanoparticles were dried and then annealed at 120 °C for 2 h and used without any other treatments for characterization and photocatalytic measurements. Characterizations of nano titania powders were carried out with several experimental techniques such as Thermal Analysis (DSC/TG), X-Ray Diffraction (XRD), Scanning Electron Microscope and Energy Dispersive X-ray spectroscopy (SEM/EDX), UV-Vis spectrophotometry, and Raman spectroscopy. Methyl orange photocatalytic degradation by TiO2 powders was investigated.
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1996
Metal Organic Chemical Vapor Deposition technique (MO-CVD) has been used to produce calcium-phosp... more Metal Organic Chemical Vapor Deposition technique (MO-CVD) has been used to produce calcium-phosphate-based bioceramic coatings. The obtained films have been studied after treatment at different temperatures in their bulk compositions using the X-ray diffraction (XRD) and in their surface composition using the X-ray photoelectron spectroscopy (XPS) and the secondary ion mass spectrometry (SIMS). β-tricalcium phosphate and stoichiometric hydroxylapatite have been
J Am Chem Soc, 1981
for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.... more for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.58 mg of an orange solid. The solid was vacuum sublimed to give 0.050 g (0.16 mmol,87oPA) Of CWsWne (CO)&lnI (IR (hexane, cm-') 2131 (W), 2050 (S), f2oO9 (m)) which was identical with an authentic sample30 by TLC. Acknowledgment. We warmly thank the National (30) Quick, M. H.; Angelici, R.
Organometallics, 1982
for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.... more for 18 h as described in the previous experimental. The solvent was blown off with Nz to yield 0.58 mg of an orange solid. The solid was vacuum sublimed to give 0.050 g (0.16 mmol,87oPA) Of CWsWne (CO)&lnI (IR (hexane, cm-') 2131 (W), 2050 (S), f2oO9 (m)) which was identical with an authentic sample30 by TLC. Acknowledgment. We warmly thank the National (30) Quick, M. H.; Angelici, R.
Organometallics, 1992
The electronic structures of a series of closely related U(ηâµ-CâHâ)âL (L = -CHâ, -NHâ, -BHâ, -... more The electronic structures of a series of closely related U(ηâµ-CâHâ)âL (L = -CHâ, -NHâ, -BHâ, - NCS) complexes has been studied using the SCF Hartree-Fock-Slater first-principles discrete variational Xα method in combination with HeI and HeII UV photoelectron spectroscopy. The theoretical results reproduce the experimental HeI and He II photoelectron spectroscopic data, thus providing a reliable description of the metal-ligand
The question of the surface chemical composition of a series of nummi, having typology, mints and... more The question of the surface chemical composition of a series of nummi, having typology, mints and periods overlapping with those of the Misurata treasure, has been investigated. SEM/EDX and XPS measurements showed different silver plating techniques used in silvering the coins. A small cluster of coins was silvered by the technique of amalgam while an other cluster of coins did not show any content of mercury demonstrating so the use of different plating methods. As well as the segregation technique that was probably in some case used, a red-ox method involving the bronze coin surface with silver ammonia complexes is here proposed. The silver complexes were probably obtained by mixing chlorargyrite (a natural silver ore) powder with fermented urine that contains big quantity of ammonia due to the decomposition of urea. A series of experiments has shown the simplicity and the validity of the proposed method.
Journal of the Chemical Society, Perkin Transactions 2, 1980
ABSTRACT
Journal of the Chemical Society, Dalton Transactions, 1979
ABSTRACT
Spectrochimica Acta Part A: Molecular Spectroscopy, 1981
ABSTRACT
Geosciences, 2013
The conservation of the historic stone heritage has great importance when this material character... more The conservation of the historic stone heritage has great importance when this material characterizes the image of a city, as it happens in Syracuse (Sicily). Its historical buildings are afflicted by a heavy state of deterioration due to the particular microclimate, to pollution and to neglect endured over time. This article reports the investigations made on limestone samples from historic façades of the city and from the neighboring quarries still in operation, in order to understand the petrographic typology, the reaction to the degradation over time, the possible maintenance and recovery interventions, and the correct applications in buildings of new construction. For this aim, bulk and surface analysis have been made both on the quarry materials and on the corresponding aged materials. It is therefore possible to define the types of rock most suitable for the use in contemporary architecture guaranteeing criteria of perfect biocompatibility. In this way a natural material can be employed in traditional and innovative uses and ensure both the sustainability of the interventions and the continuity of a consolidated tradition.
Journal of Molecular Structure: THEOCHEM, 1981
Procedia Chemistry, 2013
ABSTRACT The microanalytical characterization of several motion-picture film samples of different... more ABSTRACT The microanalytical characterization of several motion-picture film samples of different support layers (cellulose nitrate, cellulose acetate and polyester) is presented. The goal of the work is to provide, by performing analyses and collecting data, a clear picture in order to better define the nature of the samples, their morphology, and any forms of degradation, by focusing on the causes and the mechanisms of weathering. To achieve these purposes several microanalitical techniques were used. (C) 2013 The Authors. Published by Elsevier B.V.
Procedia Chemistry, 2013
The debate on graphic vandalism is recent in Italy and there are few comprehensive studies on thi... more The debate on graphic vandalism is recent in Italy and there are few comprehensive studies on this subject. The graffitism is not only an aesthetic damage but a serious and irreversible degradation of the stone, by altering its state of preservation in a irreversible way. This work approaches the graphic vandalism by following two routes: a) the micro analytical study of the interaction of spray varnishes with some stone samples (obtained from Ragusa and Palazzolo (Sicily) lythothypes) and with real stone samples (coming from historical buildings sited in Ortigia-Syracuse); b) the testing of the effectiveness and efficiency of some commercial products used to remove the varnish constituents from some stone specimens, by checking the presence of residues onto the analyzed surfaces. In both cases, several micro analytical techniques were used.
Journal of the Chemical Society, Dalton Transactions, 1980
ABSTRACT
The Journal of Physical Chemistry C, 2014
ABSTRACT ZnO nanorods (NRs) grown by chem. bath deposition (CBD) are among the most promising sem... more ABSTRACT ZnO nanorods (NRs) grown by chem. bath deposition (CBD) are among the most promising semiconducting nanostructures currently investigated for a variety of applications. Still, contrasting exptl. results appear in the literature on the microscopic mechanisms leading to high aspect ratio and vertically aligned ZnO NRs. Here, we report on CBD of ZnO NRs using Zn nitrate salt and hexamethylenetetramine (HMTA), evidencing a double role of HMTA in the NRs growth mechanism. Beyond the well-established pH buffering activity, HMTA is shown to introduce a strong steric hindrance effect, biasing growth along the c-axis and ensuring the vertical arrangement. This twofold function of HMTA should be taken into account for avoiding detrimental phenomena such as merging or suppression of NRs, which occur at low HMTA concn.
2011 International Students and Young Scientists Workshop "Photonics and Microsystems", 2011
ABSTRACT Undoped and doped TiO2 nanoparticles were prepared from titanium tetraisopropoxide hydro... more ABSTRACT Undoped and doped TiO2 nanoparticles were prepared from titanium tetraisopropoxide hydrolysis using sol-gel method. TiO2 nanoparticles were dried and then annealed at 120 °C for 2 h and used without any other treatments for characterization and photocatalytic measurements. Characterizations of nano titania powders were carried out with several experimental techniques such as Thermal Analysis (DSC/TG), X-Ray Diffraction (XRD), Scanning Electron Microscope and Energy Dispersive X-ray spectroscopy (SEM/EDX), UV-Vis spectrophotometry, and Raman spectroscopy. Methyl orange photocatalytic degradation by TiO2 powders was investigated.
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1996
Metal Organic Chemical Vapor Deposition technique (MO-CVD) has been used to produce calcium-phosp... more Metal Organic Chemical Vapor Deposition technique (MO-CVD) has been used to produce calcium-phosphate-based bioceramic coatings. The obtained films have been studied after treatment at different temperatures in their bulk compositions using the X-ray diffraction (XRD) and in their surface composition using the X-ray photoelectron spectroscopy (XPS) and the secondary ion mass spectrometry (SIMS). β-tricalcium phosphate and stoichiometric hydroxylapatite have been
Microchemical Journal, Volume 135, November 2017, Pages 140-147 Insights into the diets of early... more Microchemical Journal, Volume 135, November 2017, Pages 140-147
Insights into the diets of early societies can be gained, indirectly, from the cultural evidence of artefacts related to
food procurement, preparation and consumption and human skeletal remains. However,more direct evidence for
dietary constituents derives from the identification of intact plant and animal remains collected during the excavations
but also from the exam of the amorphous remains of foodstuff associated with artefacts. Organic residues
adhering to the surface or absorbed into the porous fabric of an unglazed cooking vessel should provide important
information both about the usage of the vessel and dietary practices. This contribute deals with the results of a
combined analytical research via 1H-1H NMR 2D-TOCSY, ATR FT-IR and SEM-EDX on organic residues on pottery
from two Sicilian prehistoric sites of Monte Kronio and Sant'Ippolito. The goal was that to shed new light on the
use of certain ceramic shapes and infer some hypothesis about ancient dietary habits.
![Research paper thumbnail of Analysis of organic residues on Sicilian prehistoric pottery via SEM-EDX and 1H NMR spectroscopy [Abstract]](https://attachments.academia-assets.com/47159154/thumbnails/1.jpg)
](ISA 2016, 41st International Symposium on Archaeometry. Book of Abstracts, p. 386