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241 results on '"Montegrossi, Giordano"'

11. On the Electrochemical Growth of a Crystalline p–n Junction From Aqueous Solutions.

Author

Felici, Roberto, Baroni, Tommaso, Carlà, Francesco, Cioffi, Nicola, Di Benedetto, Francesco, Fontanesi, Claudio, Giaccherini, Andrea, Giurlani, Walter, Gonidec, Mathieu, Lavacchi, Alessandro, Berretti, Enrico, Marcantelli, Patrick, Montegrossi, Giordano, Bonechi, Marco, Picca, Rosaria A., Poggini, Lorenzo, Russo, Francesca, Sportelli, Maria C., Torsi, Luisa, and Innocenti, Massimo

Subjects
AQUEOUS solutions, ATOMIC layer deposition, SEMICONDUCTOR devices, ULTRAHIGH vacuum, SUBSTRATES (Materials science)
Abstract

Our society largely relies on inorganic semiconductor devices which are, so far, fabricated using expensive and complex processes requiring ultra‐high vacuum equipment. Here we report on the possibility of growing a p–n junction taking advantage of electrochemical processes based on the use of aqueous solutions. The growth of the junction has been carried out using the Electrochemical Atomic Layer Deposition (E‐ALD) technique, which allowed to sequentially deposit two different semiconductors, CdS and Cu2S, on an Ag(111) substrate, in a single procedure. The growth process was monitored in situ by Surface X‐Ray Diffraction (SXRD) and resulted in the fabrication of a thin double‐layer structure with a high degree of crystallographic order and a well‐defined interface. The high‐performance electrical characteristics of the device were analysed ex‐situ and show the characteristic feature of a diode. [ABSTRACT FROM AUTHOR]

Published
2024
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16. In-situ and operando Grazing Incidence XAS: a novel set-up and its application to model Pd electrodes for alcohols oxidation.

Author

Berretti, Enrico, Giaccherini, Andrea, Dell'Aquila, Vincenzo, Di Benedetto, Francesco, Montegrossi, Giordano, Lepore, Giovanni Orazio, Innocenti, Massimo, D'Acapito, Francesco, Vizza, Francesco, and Lavacchi, Alessandro

Subjects
GRAZING incidence, ALCOHOL oxidation, ALCOHOL as fuel, X-ray absorption, BIOCHEMICAL substrates, ELECTROCATALYSIS
Abstract

In this article, we present an in-situ and operando time-resolved X-ray Absorption Spectroscopy (XAS) technique which exploits a combination of Grazing Incidence XAS (GIXAS) and Fixed Energy X-ray Absorption Voltammetry (FEXRAV), the Grazing Incidence FEXRAV (GI-FEXRAV). A case-study is also outlined. Palladium ultra-low loadings were deposited above Au polycrystalline iso-oriented substrates adopting three different deposition methods: surface-controlled electrochemical methods, direct electrodeposition, and physical vapour deposition (PVD). These catalytical surfaces were prepared for the investigation by GI-FEXRAV of the Pd oxidation/dissolution phenomenon that could occur when the metal is used in the anodic compartment of Direct Alcohol Fuel Cells (DAFCs) or in electrochemical reformers. Moreover, we report a robust, low cost and versatile procedure to obtain wide and flat iso-oriented gold substrates that can mimic monocrystalline gold (1 1 1) in the electrochemical response. The use of GI-FEXRAV for the operando characterization of the catalysts, in conjunction with the designed experimental cell and our flexible Au-based electrochemical substrates show an invaluable potential in the operando study of fundamental phenomena in heterogeneous electrocatalysis model systems and, due to its versatility, paves the way to further studies on a wide selection of electrochemical systems. [ABSTRACT FROM AUTHOR]

Published
2024
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20. CO2 Leakage Scenarios in Shale Overburden

Author

Currenti, Gilda, primary, Cantucci, Barbara, additional, Montegrossi, Giordano, additional, Napoli, Rosalba, additional, Misnan, M. Shahir, additional, Rashidi, M. Rashad Amir, additional, Abu Bakar, Zainol Affendi, additional, Harith, Zuhar Zahir Tuan, additional, Bahri, Nabila Hannah Samsol, additional, and Hashim, Noorbaizura, additional

Published
2023
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25. The composition of asbestos bodies in human lungs

Author

Bardelli, Fabrizio, primary, Pacella, Alessandro, additional, Giacobbe, Carlotta, additional, Di Benedetto, Francesco, additional, Montegrossi, Giordano, additional, Borelli, Violetta, additional, and Ballirano, Paolo, additional

Published
2023
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27. Physico-chemical properties of quartz from industrial manufacturing and its cytotoxic effects on alveolar macrophages: The case of green sand mould casting for iron production

Author

Di Benedetto, Francesco, Gazzano, Elena, Tomatis, Maura, Turci, Francesco, Pardi, Luca A., Bronco, Simona, Fornaciai, Gabriele, Innocenti, Massimo, Montegrossi, Giordano, Muniz Miranda, Maurizio, Zoleo, Alfonso, Capacci, Fabio, Fubini, Bice, Ghigo, Dario, and Romanelli, Maurizio

Published
2016
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30. CO 2 Leakage Scenarios in Shale Overburden.

Author

Currenti, Gilda, Cantucci, Barbara, Montegrossi, Giordano, Napoli, Rosalba, Misnan, M. Shahir, Rashidi, M. Rashad Amir, Abu Bakar, Zainol Affendi, Harith, Zuhar Zahir Tuan, Bahri, Nabila Hannah Samsol, and Hashim, Noorbaizura

Subjects
SEEPAGE, KNUDSEN flow, SHALE, CARBON dioxide, REACTIVE flow, LEAKAGE, SEDIMENT-water interfaces
Abstract

Potential CO2 leakage from deep geologic reservoirs requires evaluation on a site-specific basis to assess risk and arrange mitigation strategies. In this study, a heterogeneous and realistic numerical model was developed to investigate CO2 migration pathways and uprising time in a shaly overburden, located in the Malaysian off-shore. Fluid flow and reactive transport simulations were performed by TOUGHREACT to evaluate the: (1) seepage through the caprock; (2) CO2-rich brine leakage through a fault connecting the reservoir with seabed. The effect of several factors, which may contribute to CO2 migration, including different rock types and permeability, Fickian and Knudsen diffusion and CO2 adsorption in the shales were investigated. Obtained results show that permeability mainly ruled CO2 uprising velocity and pathways. CO2 migrates upward by buoyancy without any important lateral leakages due to poor-connection of permeable layers and comparable values of vertical and horizontal permeability. Diffusive flux and the Knudsen flow are negligible with respect to the Darcy regime, despite the presence of shales. Main geochemical reactions deal with carbonate and pyrite weathering which easily reach saturation due to low permeability and allowing for re-precipitation as secondary phases. CO2 adsorption on shales together with dissolved CO2 constituted the main trapping mechanisms, although the former represents likely an overestimation due to estimated thermodynamic parameters. Developed models for both scenarios are validated by the good agreement with the pressure profiles recorded in the exploration wells and the seismic data along a fault (the F05 fault), suggesting that they can accurately reproduce the main processes occurring in the system. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Low‐Temperature Thermochronologic Response to Magmatic Reheating: Insights From the Takab Metallogenic District of NW Iran, (Arabia‐Eurasia Collision Zone)

Author

Biralvand, Masoud, primary, Ballato, Paolo, additional, Balestrieri, Maria Laura, additional, Mohajjel, Mohammad, additional, Sobel, Edward R., additional, Dunkl, Istvan, additional, Montegrossi, Giordano, additional, Ghassemi, Mohammad R., additional, Glodny, Johannes, additional, and Strecker, Manfred R., additional

Published
2023
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34. CO2 Reaction-Diffusion Experiments in Shales and Carbonates

Author

Montegrossi, Giordano, primary, Cantucci, Barbara, additional, Piochi, Monica, additional, Fusi, Lorenzo, additional, Misnan, M. Shahir, additional, Rashidi, M. Rashad Amir, additional, Abu Bakar, Zainol Affendi, additional, Tuan Harith, Zuhar Zahir, additional, Bahri, Nabila Hannah Samsol, additional, and Hashim, Noorbaizura, additional

Published
2022
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35. Interplay between abiotic and microbial biofilm‐mediated processes for travertine formation: Insights from a thermal spring ( Piscine Carletti , Viterbo, Italy)

Author

Venturi, Stefania, primary, Crognale, Simona, additional, Di Benedetto, Francesco, additional, Montegrossi, Giordano, additional, Casentini, Barbara, additional, Amalfitano, Stefano, additional, Baroni, Tommaso, additional, Rossetti, Simona, additional, Tassi, Franco, additional, Capecchiacci, Francesco, additional, Vaselli, Orlando, additional, and Fazi, Stefano, additional

Published
2022
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38. Borehole observation-based in situ stress state estimation of the Los Humeros geothermal field (Mexico)

Author

European Commission, 0000-0002-6943-7257, Kruszewski, Michal, Montegrossi, Giordano, Parisio, Francesco, Saenger, Erik H., European Commission, 0000-0002-6943-7257, Kruszewski, Michal, Montegrossi, Giordano, Parisio, Francesco, and Saenger, Erik H.

Abstract

In this study, we present results of an in situ stress state estimation for the Los Humeros geothermal field (Mexico) located in the eastern section of the Trans-Mexican Volcanic Belt. During more than 40 years of geothermal energy production, issues related to induced seismicity, reservoir depletion, subsidence, and wellbore stability have occurred in Los Humeros. The in situ stress tensor, being one of the major controls on the above-mentioned phenomena, remains highly uncertain. The high temperatures of the geothermal reservoir at Los Humeros, often exceeding the critical point of water, promote difficulties in performing in situ stress measurements. In this study, based on data commonly acquired from drilling operations from eleven high-temperature wells within the Los Humeros caldera, we constrain the in situ stress state of the geothermal field. For this purpose, we employ borehole observations including borehole breakouts, instances of fluid circulation loss, and injection tests. Results from this study indicate predominantly strike-slip regime with a strong reverse component and NE-SW acting maximum horizontal stress. Utilizing slip and dilation tendency analysis, permeability and seismic activity of major fault zones within the geothermal field could be aptly explained by the acting stress regime. The outcome of this study provides valuable insights into the in situ stress state of the Los Humeros caldera and supports the exploration of conventional and unconventional (i.e., supercritical) geothermal resources.

Published
2022

42. manuscript submitted to G3 in February 2022

Author

Biralvand, Masoud, Ballato, Paolo, Balestrieri, Maria Laura, Mohajjel, Mohammad, Sobel, Edward R., Dunkl, Istv��n, Montegrossi, Giordano, Ghassemi, Mohammad R., Glodny, Johannes, and Strecker, Manfred R

Abstract

Supporting Information for Discriminating the effect of magmatic reheating from exhumational cooling: insights from the Takab metallogenic district of NW Iran, (Arabia-Eurasia collision zone)

Published
2022
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43. In-Situ Stress State of the Ruhr Region (Germany) and its Implications for Geothermal Energy Utilization

Author

Kruszewski, Michal, Montegrossi, Giordano, Backers, Tobias, and Saenger, Erik

Subjects
permeability anisotropy, Ruhr region, geothermal energy, in-situ stress, slip tendency analysis
Abstract

In this study, we carry out a reactivation potential analysis of discontinuities revealed from heavily faulted and folded Upper Carboniferous rock strata of the Ruhr region. We based this study on the notion that slip is controlled by the ratio of shear to normal effective stresses acting on a pre-existing plane of weakness in the prevailing stress field configuration. The results of this analysis were supported by indicators of localized fluid flow, both on micro and macro scales, which confirm the relationship between secondary permeability and in-situ stress state in the Ruhr region. Findings from this study, in conjunction with results of destructive laboratory testing, indicate that the steep NW-SE- and NNE-SSW-striking planar discontinuities are likely to be either close to the critical state or critically stressed in the in-situ stress configuration in the Ruhr region. These planar structures, as evidenced by indicators of localised permeability, are the main fluid pathways in the studied region. The NE-SW-striking discontinuities, on the other hand, are most likely to be closed and hydraulically inactive. Based on results gained from this study, implications for the utilization of deep geothermal energy in the region were discussed.

Published
2022
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44. Biralvand_et_al_Suppl_Mat_Revised_December2022

Author

Biralvand, Masoud, Ballato, Paolo, Balestrieri, Maria Laura, mohajjel, mahammad, Sobel, Edward, Dunkl, István, Montegrossi, Giordano, Ghassemi, Mohammad R., Glodny, Johannes, and Strecker, Manfred R

Abstract

Low-temperature thermochronologic response to magmatic reheating: insights from the Takab metallogenic district of NW Iran, (Arabia-Eurasia collision zone)

Published
2022
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47. CO 2 Reaction-Diffusion Experiments in Shales and Carbonates.

Author

Montegrossi, Giordano, Cantucci, Barbara, Piochi, Monica, Fusi, Lorenzo, Misnan, M. Shahir, Rashidi, M. Rashad Amir, Abu Bakar, Zainol Affendi, Tuan Harith, Zuhar Zahir, Bahri, Nabila Hannah Samsol, and Hashim, Noorbaizura

Subjects
*GEOLOGICAL carbon sequestration, *CARBON dioxide, *OFFSHORE structures, *SHALE, *THERMAL diffusivity, *DIFFUSION coefficients, *CARBONATES, *CHEMICAL weathering
Abstract

The evaluation of caprock integrity and reservoir efficiency is critical for safe CO2 geological storage management. It is therefore important to investigate geochemical reactions between CO2-rich fluids and host rocks and their contribution in retaining CO2 at depth. This study deals with diffusive reaction experiments on shales and carbonate samples cored from an offshore structure in the Malaysian basin, a potential target for CO2-enhanced gas recovery. The aim is to evaluate the CO2 reaction front velocity in a typical shaly caprock and the mineral response of the reservoir. Rock samples were characterized in terms of texture, chemistry, and mineralogy by X-ray diffraction, electron microscopy (SEM), microanalysis (EDS), infrared spectroscopy (FT-IR), rock geochemistry (XRF), and mercury injection capillary permeability (MICP). Performed analyses show mineralogical alteration induced by CO2 as it penetrated into the samples. Carbonate dissolution and weathering of pyrite to form secondary carbonates belonging to siderite-ankerite series were observed along two reaction fronts. Estimated diffusion coefficients of CO2 are two orders of magnitude lower than CO2(aq) molecular diffusion in pure water and from half to an order of magnitude lower than diffusivity computed on unaltered sample, highlighting the important effect of gas–water–rock reactions on the CO2(aq) diffusivities in shales and carbonates. Results obtained in this study provide an insight regarding the effect of geochemical reactions on CO2 transport and represent a further discussion point on the diffusion coefficients. [ABSTRACT FROM AUTHOR]

Published
2023
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