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274 results on '"Sani, Elisa"'

1. Optical properties and corrosion resistance of Ti2AlC, Ti3AlC2, and Cr2AlC as candidates for Concentrated Solar Power receivers

Author

Azina, Clio, Badie, Sylvain, Litnovsky, Andrey, Silvestroni, Laura, Sani, Elisa, and Gonzalez-Julian, Jesus

Subjects
Physics - Applied Physics
Abstract

New generation concentrated solar power (CSP) plants require new solar receiver materials with selective optical properties and excellent corrosion resistance against molten salts. MAX phases are promising materials for CSP applications due to their optical properties and resistance to thermal shocks. Herein, we report a solar absorptance >/= 0.5 and a thermal emittance of 0.17-0.31 between 600 and 1500 K for Cr2AlC, Ti2AlC, and Ti3AlC2. These compositions were also exposed to solar salt corrosion at 600{\deg}C for up to 4 weeks. Cr2AlC exhibited superior corrosion resistance due to the formation of a protective nanometric layer., Comment: 17 pages, 5 figures, 1 table

Published
2022
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2. Comparative study of different functionalized graphene-nanoplatelet aqueous nanofluids for solar energy applications

Author

Vallejo, Javier P., Mercatelli, Luca, Martina, Maria Raffaella, Di Rosa, Daniele, Dell'Oro, Aldo, Lugo, Luis, and Sani, Elisa

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science, Physics - Chemical Physics, Physics - Optics
Abstract

The optical properties of nanofluids are peculiar and interesting for a variety of applications. Among them, the high light extinction coefficient of nanofluids can be useful in linear parabolic concentrating solar systems, while their properties under high light irradiation intensities can be exploited for direct solar steam generation. The optical characterization of colloids, including the study of non-linear optical properties, is thus a needed step to design the use of such novel materials for solar energy exploitation. In this work, we analysed two different types of nanofluids, consisting of polycarboxylate chemically modified graphene nanoplatelets (P-GnP) and sulfonic acid-functionalized graphene nanoplatelets (S-GnP) dispersed in water, at three concentrations from 0.005 wt% to 0.05 wt%. Moderately stable nanofluids were achieved with favourable light extinction properties, as well as a non-linear optical behaviour under high input solar intensities.

Published
2022
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7. Optical properties of dense zirconium and tantalum diborides for solar thermal absorbers

Author

Sani, Elisa, Mercatelli, Luca, Meucci, Marco, Balbo, Andrea, Musa, Clara, Licheri, Roberta, Orrù, Roberto, and Cao, Giacomo

Subjects
Condensed Matter - Materials Science
Abstract

Ultra-high temperature ceramics (UHTCs) are interesting materials for a large variety of applications under extreme conditions. This paper reports on the production and extensive characterization of highly dense, pure zirconium and tantalum diborides, with particular interest to their potential utilization in the thermal solar energy field. Monolithic bulk samples are produced by Spark Plasma Sintering starting from elemental reactants or using metal diboride powders previously synthesized by Self-propagating High-temperature Synthesis (SHS). Microstructural and optical properties of products obtained by the two processing methods have been comparatively evaluated. We found that pure diborides show a good spectral selectivity, which is an appealing characteristic for solar absorber applications. No, or very small, differences in the optical properties have been evidenced when the two investigated processes adopted for the fabrication of dense TaB2 and ZrB2, respectively, are compared.

Published
2018
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30. Recent advances on ISRU technologies and study of microgravity impact on blood cells for deep space exploration

Author

Cao, Giacomo, primary, Concas, Alessandro, additional, Orrù, Roberto, additional, Licheri, Roberta, additional, Sani, Elisa, additional, Dell’Oro, Aldo, additional, Fais, Giacomo, additional, Manis, Cristina, additional, Manca, Alessia, additional, Uras, Giuseppe, additional, Caboni, Pierluigi, additional, Locci, Antonio Mario, additional, Cincotti, Alberto, additional, Lai, Nicola, additional, Congiu, Terenzio, additional, Faa, Gavino, additional, Pisu, Massimo, additional, Brelstaff, Gavin, additional, and Pantaleo, Antonella, additional

Published
2023
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41. Enhanced and Selective Absorption of Molybdenum Nanostructured Surfaces for Concentrated Solar Energy Applications

Author

Santagata, Antonio, primary, Pace, Maria Lucia, additional, Bellucci, Alessandro, additional, Mastellone, Matteo, additional, Bolli, Eleonora, additional, Valentini, Veronica, additional, Orlando, Stefano, additional, Sani, Elisa, additional, Failla, Simone, additional, Sciti, Diletta, additional, and Trucchi, Daniele Maria, additional

Published
2022
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44. Sintering, Mechanical and Optical Properties of TiB 2 Composites with and without High-Energy Milling.

Author

Taraborelli, Simone, Failla, Simone, Sani, Elisa, and Sciti, Diletta

Subjects
OPTICAL properties, SINTERING, FRACTURE toughness, WEAR resistance, HOT pressing, CUTTING tools, CERAMIC materials
Abstract

TiB2 is a promising material for several fields including impact-resistant armor, wear-resistant coatings, cutting tools and crucibles given its physical, mechanical and chemical properties, especially due to the combination of high hardness and exceptional wear resistance. It is however very difficult to sinter below 2000 °C, even under mechanical pressure; moreover, the low fracture toughness limits the applicability of the ceramic material. By using sintering additives, it is possible to improve the sintering process and increase the mechanical properties since the additives react with oxidized layers and form secondary phases. In this study, different preparation methods and various combinations of additives (B4C, Si3N4 and MoSi2) via hot pressing sintering have been explored. Through the synergy between optimized process and tailored composition, an almost fully dense material was obtained at 1700 °C with hardness of 24.4 ± 0.2 GPa and fracture toughness of 5.4 ± 0.2 MPa m1/2. However, the highest hardness (24.5 ± 0.2 GPa) and density values were obtained for only the high-energy-milled sample with WC-Co media, featuring a core–shell grain structure. Finally, optical properties for selected samples were measured, identifying the high-energy-milled TiB2 as the sample with the highest spectral selectivity α/ε and solar absorptance. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Multi-Scale Femtosecond-Laser Texturing for Photothermal Efficiency Enhancement on Solar Absorbers Based on TaB 2 Ceramics.

Author

Sani, Elisa, Sciti, Diletta, Failla, Simone, Melandri, Cesare, Bellucci, Alessandro, Orlando, Stefano, and Trucchi, Daniele M.

Subjects
*FEMTOSECOND lasers, *LASER machining, *SOLAR energy, *SURFACE texture, *TANTALUM
Abstract

Tantalum boride is an ultra-refractory and ultra-hard ceramic known so far for its favorable high-temperature thermo-mechanical properties and also characterized by a low spectral emittance, making it interesting for novel high-temperature solar absorbers for Concentrating Solar Power. In this work, we investigated two types of TaB2 sintered products with different porosities, and on each of them, we realized four femtosecond laser treatments differing in the accumulated laser fluence. The treated surfaces were then characterized by SEM-EDS, roughness analysis, and optical spectrometry. We show that, depending on laser processing parameters, the multi-scale surface textures produced by femtosecond laser machining can greatly increase the solar absorptance, while the spectral emittance increase is significantly lower. These combined effects result in increased photothermal efficiency of the absorber, with interesting perspectives for the application of these ceramics in Concentrating Solar Power and Concentrating Solar Thermal. To the best of our knowledge, this is the first demonstration of successful photothermal efficiency enhancement of ultra-hard ceramics using laser machining. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Are nanofluids suitable for volumetric absorption in ptc-csp plants? an exemplify, realistic assessment with characterised metal-oil nanofluids

Author

Carrillo-Berdugo, Iván, Martínez-Merino, Paloma, Estellé, Patrice, Sani, Elisa, Navas, Javier, Laboratoire de Génie Civil et Génie Mécanique (LGCGM), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)

Subjects
[SPI]Engineering Sciences [physics]
Abstract

AWARD FOR BEST PAPER IN RENEWABLE ENERGY 1; International audience; Concentrated solar power (CSP) has the potential to make prompt, significant carbon dioxide emission cuts by mitigating the intermittency of wind and photovoltaic power, therefore boosting their presence in our energy landscape. The low achievable energy conversion efficiency with CSP defines a limit for its operational value whose improvement could accelerate the deployment of this technology. The use of nanofluids asoptimised heat transfer fluids (HTF) has been proposed as a suitable strategy for such a purpose, if the physical properties that rule convection heat transfer are properly enhanced. More recently, nanofluids have been proposed to be used not only as HTF but, also, as volumetric absorbers for direct sunlight harvesting in CSP plants with parabolic trough collectors (PTC), if the absorption and scattering profile of nanofluids providesgood optical performance. Here we report on the design requirements for the achievement of the maximum working temperatures and assess the expected efficiencies for surface and volumetric PTC with Pd nanoplate-containing aromatic oilbased nanofluids. The analysis is based on numerical models for both types of PTC and considers the actual characteristics of PTC and the optical, thermal and rheological properties of thenanofluid, which has been characterised. Different case scenarios are compared.

Published
2021

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