Claudio Ferone | University Parthenope (original) (raw)
Papers by Claudio Ferone
Solid State Ionics, Jan 2, 2000
Zirconia gel has been hydrothermally treated at 1108C for 7 days in the presence of increasing co... more Zirconia gel has been hydrothermally treated at 1108C for 7 days in the presence of increasing concentrations of MOH basic mineralizers (M 5 Li, Na, K and (CH) N). The formation of crystalline products characterized by the presence of 3 4 single or mixed phases of zirconia either as stable (monoclinic) or metastable forms (tetragonal or cubic) has been detected. At increasing temperatures of calcination, the structure of metastable cubic changes from cubic to tetragonal, then to stable monoclinic; while the structure of metastable tetragonal changes directly into monoclinic. The rate of crystallization and 1 crystal growth of monoclinic zirconia, as well as the incorporation of M in the hydrothermally synthesized products are discussed in terms of nature and concentrations of mineralizers.
The reduction of metal (Fe3+ and Co2+)-exchanged A and X zeolites was studied by a temperature pr... more The reduction of metal (Fe3+ and Co2+)-exchanged A and X zeolites was studied by a temperature programmed reduction (TPR tecnique) in order to evaluate the reduction temperature of these samples. The study was been precedeed by a thermogravimetric analysis (TG-DTA) with the aim to define the temperature intervals which allow the investigated transformations to occur. In order to be able to study indetail the phases originating in the transformation of the zeolites lattice, X-ray diffractions were performed "in situ" with variable temperature and in the presence of a reducing gas (H2)
Materials, Jun 9, 2016
The preparation and characterization of composite materials based on geopolymers obtained from fl... more The preparation and characterization of composite materials based on geopolymers obtained from fly ash and epoxy resins are reported for the first time. These materials have been prepared through a synthetic method based on the concurrent reticulation of the organic and inorganic components that allows the formation of hydrogen bonding between the phases, ensuring a very high compatibility between them. These new composites show significantly improved mechanical properties if compared to neat geopolymers with the same composition and comparable performances in respect to analogous geopolymer-based composites obtained starting from more expensive raw material such as metakaolin. The positive combination of an easy synthetic approach with the use of industrial by-products has allowed producing novel low cost aluminosilicate binders that, thanks to their thixotropicity and good adhesion against materials commonly used in building constructions, could be used within the field of sustainable building.
Composites Part B-engineering, Nov 1, 2017
The present study reports on the preparation and characterization of new organic-inorganic geopol... more The present study reports on the preparation and characterization of new organic-inorganic geopolymer based hybrid foams obtained by reacting an aluminosilicate source and an alkalisilicate solution with mixtures of dialkylsiloxane oligomers or organic resins precursors. By using different amounts of Si 0 powder as in situ foaming agent, hybrid geopolymer-based foams with densities ranging from 0.25 to 0.85 g/cm 3 were successfully prepared. These new materials are characterized by remarkable mechanical properties, good fire resistance and low thermal conductivity, significantly better than those shown by neat geopolymer foams reported in the literature and comparable or even better than those of typical (not geopolymer) inorganic foamed materials with similar densities. 1. Highlights 1. Hybrid geopolymer-based foams with densities ranging from 0.25 to 0.85 g/cm 3 were obtained. 2. By using Si 0 powder as in situ foaming agent, a homogeneous and very regular foaming process was obtained. 3. Mechanical and thermal performances significantly better than those shown by neat geopolymeric foams and inorganic foamed-materials with similar densities.
Cement & Concrete Composites, May 1, 2015
Hybrid composite materials based on geopolymer and epoxy melamine resins have been designed to pr... more Hybrid composite materials based on geopolymer and epoxy melamine resins have been designed to produce a novel material showing high compatibility between the organic and inorganic phases. This has been realized through a synthetic method based on the co-reticulation in mild condition of the two phases. These materials show good interpenetration of the resin into the inorganic matrix up to nanometric level and significantly improved mechanical properties in respect to unmodified geopolymer without compromising the good thermal stability and fire resistance typical of unmodified geopolymers. These properties make the novel materials very attractive for the realization of thermo-resistant and thermo-insulating panels.
Acta Crystallographica Section E-structure Reports Online, Jul 6, 2013
m434 Roviello et al. [FeCl 2 (C 18 H 25 N 3 O 2)] Acta Cryst. (2013). E69, m433-m434 supporting i... more m434 Roviello et al. [FeCl 2 (C 18 H 25 N 3 O 2)] Acta Cryst. (2013). E69, m433-m434 supporting information sup-1
Social Science Research Network, 2022
Materials, Sep 9, 2013
The preparation and the characterization of novel geopolymer-based hybrid composites are reported... more The preparation and the characterization of novel geopolymer-based hybrid composites are reported. These materials have been prepared through an innovative synthetic approach, based on a co-reticulation in mild conditions of commercial epoxy based organic resins and a metakaolin-based geopolymer inorganic matrix. This synthetic strategy allows the obtainment of a homogeneous dispersion of the organic particles in the inorganic matrix, up to 25% in weight of the resin. The materials obtained present significantly enhanced compressive strengths and toughness with respect to the neat geopolymer, suggesting their wide utilization for structural applications. A preliminary characterization of the porous materials obtained by removing the organic phase from the hybrid composites by means of heat treatments is also reported. Possible applications of these materials in the field of water purification, filtration, or as lightweight insulating materials are envisaged.
Materials, Jun 24, 2016
This study presents an experimental overview for the development of photocatalytic materials base... more This study presents an experimental overview for the development of photocatalytic materials based on geopolymer binders as catalyst support matrices. Particularly, geopolymer matrices obtained from different solid precursors (fly ash and metakaolin), composite systems (siloxane-hybrid, foamed hybrid), and curing temperatures (room temperature and 60˝C) were investigated for the same photocatalyst content (i.e., 3% TiO 2 by weight of paste). The geopolymer matrices were previously designed for different applications, ranging from insulating (foam) to structural materials. The photocatalytic activity was evaluated as NO degradation in air, and the results were compared with an ordinary Portland cement reference. The studied matrices demonstrated highly variable photocatalytic performance depending on both matrix constituents and the curing temperature, with promising activity revealed by the geopolymers based on fly ash and metakaolin. Furthermore, microstructural features and titania dispersion in the matrices were assessed by scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) analyses. Particularly, EDS analyses of sample sections indicated segregation effects of titania in the surface layer, with consequent enhancement or depletion of the catalyst concentration in the active sample region, suggesting non-negligible transport phenomena during the curing process. The described results demonstrated that geopolymer binders can be interesting catalyst support matrices for the development of photocatalytic materials and indicated a large potential for the exploitation of their peculiar features.
Materials, Mar 17, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials, Dec 2, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials, Jul 17, 2013
The preparation and characterization of metakaolin-based geopolymer mortars containing an organic... more The preparation and characterization of metakaolin-based geopolymer mortars containing an organic epoxy resin are presented here for the first time. The specimens have been prepared by means of an innovative in situ co-reticulation process, in mild conditions, of commercial epoxy based organic resins and geopolymeric slurry. In this way, geopolymer based hybrid mortars characterized by a different content of normalized sand (up to 66% in weight) and by a homogeneous dispersion of the organic resin have been obtained. Once hardened, these new materials show improved compressive strength and toughness in respect to both the neat geopolymer and the hybrid pastes since the organic polymer provides a more cohesive microstructure, with a reduced amount of microcracks. The microstructural characterization allows to point out the presence of an Interfacial Transition Zone similar to that observed in cement based mortars and concretes. A correlation between microstructural features and mechanical properties has been studied too.
Chemical Engineering Research and Design
Composites Part B: Engineering, 2018
Alkali activated waste fly ash as sustainable composite: Influence of curing and pozzolanic admix... more Alkali activated waste fly ash as sustainable composite: Influence of curing and pozzolanic admixtures on the early-age physicomechanical properties and residual strength after exposure at elevated temperature, Composites Part B (2017),
Microporous and Mesoporous Materials, Feb 1, 2023
Journal of materials chemistry. A, Materials for energy and sustainability, 2015
Please note that technical editing may introduce minor changes to the text and/or graphics, which... more Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal's standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains.
Solid State Ionics, Dec 31, 2008
ABSTRACT An unconventional method for preparing monoclinic Sr-feldspar starting from a synthetic ... more ABSTRACT An unconventional method for preparing monoclinic Sr-feldspar starting from a synthetic Na-A zeolite is presented. Accordingly, samples of Sr2+-exchanged zeolite A (Sr-A), containing a residual 5% content of Na+, were thermally treated at temperatures up to 1150 °C for times up to 24 h. Sr-A zeolitic structure breakdown, occurred at about 900 °C and followed by the crystallization of the hexagonal form of Sr-feldspar (Sr-hexacelsian) at about 950 °C, resulted in the final conversion, in 1 h at 1150 °C, of the original zeolitic material into a monoclinic polymorph of Sr-feldspar. Increasing the duration of the thermal treatment up to about 5 h gave rise to the crystallization of monoclinic Sr-celsian at only 1000 °C.
Microporous and Mesoporous Materials, Sep 1, 2019
Many industrial applications need supporting or shaping powdery zeolites. Since geopolymers can b... more Many industrial applications need supporting or shaping powdery zeolites. Since geopolymers can be considered the amorphous counterpart or precursors of crystalline zeolites, it is possible to promote zeolite crystallization inside the geopolymeric matrix by tuning pH, temperature and time of the geopolymerization reaction. In this paper, combining zeolite crystallization with a foaming process initiated by silicon, a multifunctional self-supporting zeolitic material has been obtained with pores ranging from the micro to the macro range. Geopolymerization and crystallization have been realized simultaneously curing the samples at specific temperature and humidity conditions. Every specimen obtained at curing time higher than two days, regardless relative humidity and silicon content, contained zeolite A [LTA] and X [FAU] as the only crystalline phases. Finally, the porosity generated by the foaming process promotes the zeolite nucleation mainly on the surfaces of the pores, whereas the struts remain amorphous.
Solid State Ionics, Jan 2, 2000
Zirconia gel has been hydrothermally treated at 1108C for 7 days in the presence of increasing co... more Zirconia gel has been hydrothermally treated at 1108C for 7 days in the presence of increasing concentrations of MOH basic mineralizers (M 5 Li, Na, K and (CH) N). The formation of crystalline products characterized by the presence of 3 4 single or mixed phases of zirconia either as stable (monoclinic) or metastable forms (tetragonal or cubic) has been detected. At increasing temperatures of calcination, the structure of metastable cubic changes from cubic to tetragonal, then to stable monoclinic; while the structure of metastable tetragonal changes directly into monoclinic. The rate of crystallization and 1 crystal growth of monoclinic zirconia, as well as the incorporation of M in the hydrothermally synthesized products are discussed in terms of nature and concentrations of mineralizers.
The reduction of metal (Fe3+ and Co2+)-exchanged A and X zeolites was studied by a temperature pr... more The reduction of metal (Fe3+ and Co2+)-exchanged A and X zeolites was studied by a temperature programmed reduction (TPR tecnique) in order to evaluate the reduction temperature of these samples. The study was been precedeed by a thermogravimetric analysis (TG-DTA) with the aim to define the temperature intervals which allow the investigated transformations to occur. In order to be able to study indetail the phases originating in the transformation of the zeolites lattice, X-ray diffractions were performed "in situ" with variable temperature and in the presence of a reducing gas (H2)
Materials, Jun 9, 2016
The preparation and characterization of composite materials based on geopolymers obtained from fl... more The preparation and characterization of composite materials based on geopolymers obtained from fly ash and epoxy resins are reported for the first time. These materials have been prepared through a synthetic method based on the concurrent reticulation of the organic and inorganic components that allows the formation of hydrogen bonding between the phases, ensuring a very high compatibility between them. These new composites show significantly improved mechanical properties if compared to neat geopolymers with the same composition and comparable performances in respect to analogous geopolymer-based composites obtained starting from more expensive raw material such as metakaolin. The positive combination of an easy synthetic approach with the use of industrial by-products has allowed producing novel low cost aluminosilicate binders that, thanks to their thixotropicity and good adhesion against materials commonly used in building constructions, could be used within the field of sustainable building.
Composites Part B-engineering, Nov 1, 2017
The present study reports on the preparation and characterization of new organic-inorganic geopol... more The present study reports on the preparation and characterization of new organic-inorganic geopolymer based hybrid foams obtained by reacting an aluminosilicate source and an alkalisilicate solution with mixtures of dialkylsiloxane oligomers or organic resins precursors. By using different amounts of Si 0 powder as in situ foaming agent, hybrid geopolymer-based foams with densities ranging from 0.25 to 0.85 g/cm 3 were successfully prepared. These new materials are characterized by remarkable mechanical properties, good fire resistance and low thermal conductivity, significantly better than those shown by neat geopolymer foams reported in the literature and comparable or even better than those of typical (not geopolymer) inorganic foamed materials with similar densities. 1. Highlights 1. Hybrid geopolymer-based foams with densities ranging from 0.25 to 0.85 g/cm 3 were obtained. 2. By using Si 0 powder as in situ foaming agent, a homogeneous and very regular foaming process was obtained. 3. Mechanical and thermal performances significantly better than those shown by neat geopolymeric foams and inorganic foamed-materials with similar densities.
Cement & Concrete Composites, May 1, 2015
Hybrid composite materials based on geopolymer and epoxy melamine resins have been designed to pr... more Hybrid composite materials based on geopolymer and epoxy melamine resins have been designed to produce a novel material showing high compatibility between the organic and inorganic phases. This has been realized through a synthetic method based on the co-reticulation in mild condition of the two phases. These materials show good interpenetration of the resin into the inorganic matrix up to nanometric level and significantly improved mechanical properties in respect to unmodified geopolymer without compromising the good thermal stability and fire resistance typical of unmodified geopolymers. These properties make the novel materials very attractive for the realization of thermo-resistant and thermo-insulating panels.
Acta Crystallographica Section E-structure Reports Online, Jul 6, 2013
m434 Roviello et al. [FeCl 2 (C 18 H 25 N 3 O 2)] Acta Cryst. (2013). E69, m433-m434 supporting i... more m434 Roviello et al. [FeCl 2 (C 18 H 25 N 3 O 2)] Acta Cryst. (2013). E69, m433-m434 supporting information sup-1
Social Science Research Network, 2022
Materials, Sep 9, 2013
The preparation and the characterization of novel geopolymer-based hybrid composites are reported... more The preparation and the characterization of novel geopolymer-based hybrid composites are reported. These materials have been prepared through an innovative synthetic approach, based on a co-reticulation in mild conditions of commercial epoxy based organic resins and a metakaolin-based geopolymer inorganic matrix. This synthetic strategy allows the obtainment of a homogeneous dispersion of the organic particles in the inorganic matrix, up to 25% in weight of the resin. The materials obtained present significantly enhanced compressive strengths and toughness with respect to the neat geopolymer, suggesting their wide utilization for structural applications. A preliminary characterization of the porous materials obtained by removing the organic phase from the hybrid composites by means of heat treatments is also reported. Possible applications of these materials in the field of water purification, filtration, or as lightweight insulating materials are envisaged.
Materials, Jun 24, 2016
This study presents an experimental overview for the development of photocatalytic materials base... more This study presents an experimental overview for the development of photocatalytic materials based on geopolymer binders as catalyst support matrices. Particularly, geopolymer matrices obtained from different solid precursors (fly ash and metakaolin), composite systems (siloxane-hybrid, foamed hybrid), and curing temperatures (room temperature and 60˝C) were investigated for the same photocatalyst content (i.e., 3% TiO 2 by weight of paste). The geopolymer matrices were previously designed for different applications, ranging from insulating (foam) to structural materials. The photocatalytic activity was evaluated as NO degradation in air, and the results were compared with an ordinary Portland cement reference. The studied matrices demonstrated highly variable photocatalytic performance depending on both matrix constituents and the curing temperature, with promising activity revealed by the geopolymers based on fly ash and metakaolin. Furthermore, microstructural features and titania dispersion in the matrices were assessed by scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) analyses. Particularly, EDS analyses of sample sections indicated segregation effects of titania in the surface layer, with consequent enhancement or depletion of the catalyst concentration in the active sample region, suggesting non-negligible transport phenomena during the curing process. The described results demonstrated that geopolymer binders can be interesting catalyst support matrices for the development of photocatalytic materials and indicated a large potential for the exploitation of their peculiar features.
Materials, Mar 17, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials, Dec 2, 2022
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials, Jul 17, 2013
The preparation and characterization of metakaolin-based geopolymer mortars containing an organic... more The preparation and characterization of metakaolin-based geopolymer mortars containing an organic epoxy resin are presented here for the first time. The specimens have been prepared by means of an innovative in situ co-reticulation process, in mild conditions, of commercial epoxy based organic resins and geopolymeric slurry. In this way, geopolymer based hybrid mortars characterized by a different content of normalized sand (up to 66% in weight) and by a homogeneous dispersion of the organic resin have been obtained. Once hardened, these new materials show improved compressive strength and toughness in respect to both the neat geopolymer and the hybrid pastes since the organic polymer provides a more cohesive microstructure, with a reduced amount of microcracks. The microstructural characterization allows to point out the presence of an Interfacial Transition Zone similar to that observed in cement based mortars and concretes. A correlation between microstructural features and mechanical properties has been studied too.
Chemical Engineering Research and Design
Composites Part B: Engineering, 2018
Alkali activated waste fly ash as sustainable composite: Influence of curing and pozzolanic admix... more Alkali activated waste fly ash as sustainable composite: Influence of curing and pozzolanic admixtures on the early-age physicomechanical properties and residual strength after exposure at elevated temperature, Composites Part B (2017),
Microporous and Mesoporous Materials, Feb 1, 2023
Journal of materials chemistry. A, Materials for energy and sustainability, 2015
Please note that technical editing may introduce minor changes to the text and/or graphics, which... more Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal's standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains.
Solid State Ionics, Dec 31, 2008
ABSTRACT An unconventional method for preparing monoclinic Sr-feldspar starting from a synthetic ... more ABSTRACT An unconventional method for preparing monoclinic Sr-feldspar starting from a synthetic Na-A zeolite is presented. Accordingly, samples of Sr2+-exchanged zeolite A (Sr-A), containing a residual 5% content of Na+, were thermally treated at temperatures up to 1150 °C for times up to 24 h. Sr-A zeolitic structure breakdown, occurred at about 900 °C and followed by the crystallization of the hexagonal form of Sr-feldspar (Sr-hexacelsian) at about 950 °C, resulted in the final conversion, in 1 h at 1150 °C, of the original zeolitic material into a monoclinic polymorph of Sr-feldspar. Increasing the duration of the thermal treatment up to about 5 h gave rise to the crystallization of monoclinic Sr-celsian at only 1000 °C.
Microporous and Mesoporous Materials, Sep 1, 2019
Many industrial applications need supporting or shaping powdery zeolites. Since geopolymers can b... more Many industrial applications need supporting or shaping powdery zeolites. Since geopolymers can be considered the amorphous counterpart or precursors of crystalline zeolites, it is possible to promote zeolite crystallization inside the geopolymeric matrix by tuning pH, temperature and time of the geopolymerization reaction. In this paper, combining zeolite crystallization with a foaming process initiated by silicon, a multifunctional self-supporting zeolitic material has been obtained with pores ranging from the micro to the macro range. Geopolymerization and crystallization have been realized simultaneously curing the samples at specific temperature and humidity conditions. Every specimen obtained at curing time higher than two days, regardless relative humidity and silicon content, contained zeolite A [LTA] and X [FAU] as the only crystalline phases. Finally, the porosity generated by the foaming process promotes the zeolite nucleation mainly on the surfaces of the pores, whereas the struts remain amorphous.