This work deals with the composition and the state of conservation of the concrete of two hangars... more This work deals with the composition and the state of conservation of the concrete of two hangars designed and built by Pier Luigi Nervi in 1940- I 941. The interest in his project is related both to the use of on site prefabrication for so large structures (45x55m pian), and to some peculiarities of the mix design. In particular the aggregate/binder ratio and the lithological composition of the aggregates. The study has been performed by means of X ray diffractometry, optical microscopy in transmitted light on thin sections, ionic cromatography and carbonation tests. The twofold aim is to asses the conservation condition of concrete after 67 years of ageing in a marine spray environment and to relate the degradation phenomena both to mix design and to pouring operation.
ABSTRACT Strontium titanate-based perovskites have been prepared in the presence of Y and Co with... more ABSTRACT Strontium titanate-based perovskites have been prepared in the presence of Y and Co with the aim to substitute Sr and Ti, respectively, in the ST crystalline structure. The obtained samples have been characterized by XRD, Raman spectroscopy, FE-SEM, XPS and tested as photocatalysts in two gas–solid regime reactions: (i) 2-propanol complete mineralization and (ii) propene partial oxidation, using a system simulating solar irradiation. All the tested samples resulted active as photocatalysts but with significant differences. The lattice substitution of Sr by Y displays a beneficial effect on the 2-propanol photodegradation. Conversely, the partial presence of cobalt on the ST surface, as Co-oxide nanodispersed clusters with a dominant Co(II) phase, plays a substantial detrimental effect on the photo-degradation process of 2-propanol, but favours the photocatalytic partial oxidation of propene to propene oxide.
ABSTRACT Commercial and home prepared TiO2 samples were functionalized with a commercial Keggin h... more ABSTRACT Commercial and home prepared TiO2 samples were functionalized with a commercial Keggin heteropolyacid (HPA) H3PW12O40 (PW12) or with a hydrothermally home prepared K7PW11O39 salt (PW11). All the materials were characterized by specific surface area measurements (BET), XRD analyses, Raman, DRS along with SEM observations and they have been used for glucose photocatalytic conversion in aqueous suspension. Different reaction extent and distribution of intermediate oxidation products were observed depending on the photocatalyst. Gluconic acid, arabinose, erythrose and formic acid were observed as oxidation products when bare TiO2 or HPA/TiO2 composite materials were used. Glucose isomerization to form fructose was also observed and in some runs traces of glucaric acid and glyceraldehyde were also found. The carbon mass balance was accomplished in the presence of the commercial Evonik P25 TiO2 powder and the composites where TiO2 was present, whereas the presence of the solvothermically prepared TiO2 gave rise to a carbon unbalance, due to strong adsorption of the products on the photocatalyst surface. No reactivity was observed in the presence of PW12 alone while PW11 induced only isomerization of the glucose.
Bulletin of Engineering Geology and the Environment, 2015
ABSTRACT This paper deals with the compositional and textural characteristics determining open me... more ABSTRACT This paper deals with the compositional and textural characteristics determining open metastable structures in the pleistocenic sand outcropping in the Agrigento district (Sicily). The aim of the study was to individuate the bonding types occurring between grains that could generate matric suction phenomena. The composition and microfabric were characterised by means of granulometry, porosimetry, permeability, optical and ESEM-EDS microscopy, thermogravimetry and XR diffractometry, electric conductivity, and ionic chromatography. The data thus acquired show that the skeleton of the sand is constituted mostly by bioclasts and microfossils, calcite and quartz monocrystalline grains. Moreover, assemblages of silt and clay minerals are interposed among them. Cementation is generally absent even at the sites of contact between grains. Porosity is due mainly to interparticle voids. The spatial arrangement of sand, silt and limey grains, the pore geometry, volume and size distribution and network connectivity allow both capillary condensation and effective capillary transport of water. It appears that bonding is due mainly to capillary forces related to the texture and to the type of pores rather than being ruled by composition.
ABSTRACT The photocatalytic oxidation of trans-ferulic acid to vanillin in water has been studied... more ABSTRACT The photocatalytic oxidation of trans-ferulic acid to vanillin in water has been studied by using various TiO2 and WO3-loaded TiO2 samples as catalysts. Different values of selectivity were obtained depending on the physico-chemical properties of the single samples and a vanillin selectivity of 10% was reached in the presence of the commercial TiO2 Merck. Higher selectivity values were obtained by impregnation of TiO2 with H2WO4 followed by calcination. The increased production of vanillin exhibited by the obtained WO3-loaded TiO2 powders was attributed to a reduced further oxidation of the aldehyde caused by the presence of the practically inactive tungsten trioxide hydrate on the TiO2 surface. The best result (ca. 25% of selectivity) was obtained with the WO3(1%)/TiO2 sample.
Problem statement: Several studies on organotin(IV) dithiocarbamate compounds have been carried o... more Problem statement: Several studies on organotin(IV) dithiocarbamate compounds have been carried out but not on the synthesis and characterization together with cytotoxic assay of organotin(IV) N-benzyl-N-isopropyldithiocarbamate compounds. Approach: Three new ...
This study started with the restoration of a 14 th century Italian crosier during the final Maste... more This study started with the restoration of a 14 th century Italian crosier during the final Master year project at the Institute National du Patrimone in Paris (Palazzo 2014). The characterization and consolidation of the bone materials constituting the crosier was needed due to its poor state of conservation. Several products, both organic polymers and inorganic consolidants applied on artificially altered bone material underwent scientific investigations consisting of several analyses and mechanical tests in order to choose the most suitable for the restoration intervention. The results thus obtained showed that both nanolime and a mix of Paraloid ® and calcium phosphate seem to be adequate for treating such objects.
Close Document Image Close Document Printer Image Print This Document! Conservation Information N... more Close Document Image Close Document Printer Image Print This Document! Conservation Information Network (BCIN). Author: Rizzo, Giovanni; Algozzini, Giuseppina Maria; D'Agostino, Fabio; Megna, Bartolomeo; Ercoli, Laura ...
RIZZO G, ERCOLI L, ALGOZZINI G, D'AGOSTINO F, & MEGNA B (2004). Floor and wall m... more RIZZO G, ERCOLI L, ALGOZZINI G, D'AGOSTINO F, & MEGNA B (2004). Floor and wall mortars of archaeological site of Selinunte , Sicily. Paper presented at 8-th Int. Symposium on conservation of monuments in the Mediterranean basin-Influence of the environment and defense of ...
This work deals with the composition and the state of conservation of the concrete of two hangars... more This work deals with the composition and the state of conservation of the concrete of two hangars designed and built by Pier Luigi Nervi in 1940- I 941. The interest in his project is related both to the use of on site prefabrication for so large structures (45x55m pian), and to some peculiarities of the mix design. In particular the aggregate/binder ratio and the lithological composition of the aggregates. The study has been performed by means of X ray diffractometry, optical microscopy in transmitted light on thin sections, ionic cromatography and carbonation tests. The twofold aim is to asses the conservation condition of concrete after 67 years of ageing in a marine spray environment and to relate the degradation phenomena both to mix design and to pouring operation.
ABSTRACT Strontium titanate-based perovskites have been prepared in the presence of Y and Co with... more ABSTRACT Strontium titanate-based perovskites have been prepared in the presence of Y and Co with the aim to substitute Sr and Ti, respectively, in the ST crystalline structure. The obtained samples have been characterized by XRD, Raman spectroscopy, FE-SEM, XPS and tested as photocatalysts in two gas–solid regime reactions: (i) 2-propanol complete mineralization and (ii) propene partial oxidation, using a system simulating solar irradiation. All the tested samples resulted active as photocatalysts but with significant differences. The lattice substitution of Sr by Y displays a beneficial effect on the 2-propanol photodegradation. Conversely, the partial presence of cobalt on the ST surface, as Co-oxide nanodispersed clusters with a dominant Co(II) phase, plays a substantial detrimental effect on the photo-degradation process of 2-propanol, but favours the photocatalytic partial oxidation of propene to propene oxide.
ABSTRACT Commercial and home prepared TiO2 samples were functionalized with a commercial Keggin h... more ABSTRACT Commercial and home prepared TiO2 samples were functionalized with a commercial Keggin heteropolyacid (HPA) H3PW12O40 (PW12) or with a hydrothermally home prepared K7PW11O39 salt (PW11). All the materials were characterized by specific surface area measurements (BET), XRD analyses, Raman, DRS along with SEM observations and they have been used for glucose photocatalytic conversion in aqueous suspension. Different reaction extent and distribution of intermediate oxidation products were observed depending on the photocatalyst. Gluconic acid, arabinose, erythrose and formic acid were observed as oxidation products when bare TiO2 or HPA/TiO2 composite materials were used. Glucose isomerization to form fructose was also observed and in some runs traces of glucaric acid and glyceraldehyde were also found. The carbon mass balance was accomplished in the presence of the commercial Evonik P25 TiO2 powder and the composites where TiO2 was present, whereas the presence of the solvothermically prepared TiO2 gave rise to a carbon unbalance, due to strong adsorption of the products on the photocatalyst surface. No reactivity was observed in the presence of PW12 alone while PW11 induced only isomerization of the glucose.
Bulletin of Engineering Geology and the Environment, 2015
ABSTRACT This paper deals with the compositional and textural characteristics determining open me... more ABSTRACT This paper deals with the compositional and textural characteristics determining open metastable structures in the pleistocenic sand outcropping in the Agrigento district (Sicily). The aim of the study was to individuate the bonding types occurring between grains that could generate matric suction phenomena. The composition and microfabric were characterised by means of granulometry, porosimetry, permeability, optical and ESEM-EDS microscopy, thermogravimetry and XR diffractometry, electric conductivity, and ionic chromatography. The data thus acquired show that the skeleton of the sand is constituted mostly by bioclasts and microfossils, calcite and quartz monocrystalline grains. Moreover, assemblages of silt and clay minerals are interposed among them. Cementation is generally absent even at the sites of contact between grains. Porosity is due mainly to interparticle voids. The spatial arrangement of sand, silt and limey grains, the pore geometry, volume and size distribution and network connectivity allow both capillary condensation and effective capillary transport of water. It appears that bonding is due mainly to capillary forces related to the texture and to the type of pores rather than being ruled by composition.
ABSTRACT The photocatalytic oxidation of trans-ferulic acid to vanillin in water has been studied... more ABSTRACT The photocatalytic oxidation of trans-ferulic acid to vanillin in water has been studied by using various TiO2 and WO3-loaded TiO2 samples as catalysts. Different values of selectivity were obtained depending on the physico-chemical properties of the single samples and a vanillin selectivity of 10% was reached in the presence of the commercial TiO2 Merck. Higher selectivity values were obtained by impregnation of TiO2 with H2WO4 followed by calcination. The increased production of vanillin exhibited by the obtained WO3-loaded TiO2 powders was attributed to a reduced further oxidation of the aldehyde caused by the presence of the practically inactive tungsten trioxide hydrate on the TiO2 surface. The best result (ca. 25% of selectivity) was obtained with the WO3(1%)/TiO2 sample.
Problem statement: Several studies on organotin(IV) dithiocarbamate compounds have been carried o... more Problem statement: Several studies on organotin(IV) dithiocarbamate compounds have been carried out but not on the synthesis and characterization together with cytotoxic assay of organotin(IV) N-benzyl-N-isopropyldithiocarbamate compounds. Approach: Three new ...
This study started with the restoration of a 14 th century Italian crosier during the final Maste... more This study started with the restoration of a 14 th century Italian crosier during the final Master year project at the Institute National du Patrimone in Paris (Palazzo 2014). The characterization and consolidation of the bone materials constituting the crosier was needed due to its poor state of conservation. Several products, both organic polymers and inorganic consolidants applied on artificially altered bone material underwent scientific investigations consisting of several analyses and mechanical tests in order to choose the most suitable for the restoration intervention. The results thus obtained showed that both nanolime and a mix of Paraloid ® and calcium phosphate seem to be adequate for treating such objects.
Close Document Image Close Document Printer Image Print This Document! Conservation Information N... more Close Document Image Close Document Printer Image Print This Document! Conservation Information Network (BCIN). Author: Rizzo, Giovanni; Algozzini, Giuseppina Maria; D'Agostino, Fabio; Megna, Bartolomeo; Ercoli, Laura ...
RIZZO G, ERCOLI L, ALGOZZINI G, D'AGOSTINO F, & MEGNA B (2004). Floor and wall m... more RIZZO G, ERCOLI L, ALGOZZINI G, D'AGOSTINO F, & MEGNA B (2004). Floor and wall mortars of archaeological site of Selinunte , Sicily. Paper presented at 8-th Int. Symposium on conservation of monuments in the Mediterranean basin-Influence of the environment and defense of ...
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on site prefabrication for so large structures (45x55m pian), and to some peculiarities of the mix design. In particular the aggregate/binder ratio and the lithological composition of the aggregates. The study has been
performed by means of X ray diffractometry, optical microscopy in transmitted light on thin sections, ionic cromatography and carbonation tests. The twofold aim is to asses the conservation condition of concrete after 67 years of ageing in a marine spray environment and to relate the degradation phenomena both to mix design and to pouring operation.
on site prefabrication for so large structures (45x55m pian), and to some peculiarities of the mix design. In particular the aggregate/binder ratio and the lithological composition of the aggregates. The study has been
performed by means of X ray diffractometry, optical microscopy in transmitted light on thin sections, ionic cromatography and carbonation tests. The twofold aim is to asses the conservation condition of concrete after 67 years of ageing in a marine spray environment and to relate the degradation phenomena both to mix design and to pouring operation.