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38 results on '"Salzano de Luna, Martina"'

1. Tailoring Chitosan/LTA Zeolite Hybrid Aerogels for Anionic and Cationic Dye Adsorption

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Salzano de Luna, Martina, Greco, Francesco, Pastore, Raffaele, Mensitieri, Giuseppe, Filippone, Giovanni, Aprea, Paolo, Mallamace, Domenico, Mallamace, Francesco, Chen, Sow-Hsin, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Salzano de Luna, Martina, Greco, Francesco, Pastore, Raffaele, Mensitieri, Giuseppe, Filippone, Giovanni, Aprea, Paolo, Mallamace, Domenico, Mallamace, Francesco, and Chen, Sow-Hsin

Abstract

Chitosan (CS) is largely employed in environmental applications as an adsorbent of anionic dyes, due to the presence in its chemical structure of amine groups that, if protonated, act as adsorbing sites for negatively charged molecules. Efficient adsorption of both cationic and anionic dyes is thus not achievable with a pristine chitosan adsorbent, but it requires the combination of two or more components. Here, we show that simultaneous adsorption of cationic and anionic dyes can be obtained by embedding Linde Type A (LTA) zeolite particles in a crosslinked CS-based aerogel. In order to optimize dye removal ability of the hybrid aerogel, we target the crosslinker concentration so that crosslinking is mainly activated during the thermal treatment after the fast freezing of the CS/LTA mixture. The adsorption of isotherms is obtained for different CS/LTA weight ratios and for different types of anionic and cationic dyes. Irrespective of the formulation, the Langmuir model was found to accurately describe the adsorption isotherms. The optimal tradeoff in the adsorption behavior was obtained with the CS/LTA aerogel (1:1 weight ratio), for which the maximum uptake of indigo carmine (anionic dye) and rhodamine 6G (cationic dye) is 103 and 43 mg g−1, respectively. The behavior observed for the adsorption capacity and energy cannot be rationalized as a pure superposition of the two components, but suggests that reciprocal steric effects, chemical heterogeneity, and molecular interactions between CS and LTA zeolite particles play an important role.

Published
2022

2. Tailoring Chitosan/LTA Zeolite Hybrid Aerogels for Anionic and Cationic Dye Adsorption

Author

Salzano de Luna, Martina, Greco, Francesco, Pastore, Raffaele, Mensitieri, Giuseppe, Filippone, Giovanni, Aprea, Paolo, Mallamace, Domenico, Mallamace, Francesco, Chen, Sow-Hsin, Salzano de Luna, Martina, Greco, Francesco, Pastore, Raffaele, Mensitieri, Giuseppe, Filippone, Giovanni, Aprea, Paolo, Mallamace, Domenico, Mallamace, Francesco, and Chen, Sow-Hsin

Abstract

Chitosan (CS) is largely employed in environmental applications as an adsorbent of anionic dyes, due to the presence in its chemical structure of amine groups that, if protonated, act as adsorbing sites for negatively charged molecules. Efficient adsorption of both cationic and anionic dyes is thus not achievable with a pristine chitosan adsorbent, but it requires the combination of two or more components. Here, we show that simultaneous adsorption of cationic and anionic dyes can be obtained by embedding Linde Type A (LTA) zeolite particles in a crosslinked CS-based aerogel. In order to optimize dye removal ability of the hybrid aerogel, we target the crosslinker concentration so that crosslinking is mainly activated during the thermal treatment after the fast freezing of the CS/LTA mixture. The adsorption of isotherms is obtained for different CS/LTA weight ratios and for different types of anionic and cationic dyes. Irrespective of the formulation, the Langmuir model was found to accurately describe the adsorption isotherms. The optimal tradeoff in the adsorption behavior was obtained with the CS/LTA aerogel (1:1 weight ratio), for which the maximum uptake of indigo carmine (anionic dye) and rhodamine 6G (cationic dye) is 103 and 43 mg g−1, respectively. The behavior observed for the adsorption capacity and energy cannot be rationalized as a pure superposition of the two components, but suggests that reciprocal steric effects, chemical heterogeneity, and molecular interactions between CS and LTA zeolite particles play an important role.

Published
2021

3. Some Aspects of the Liquid Water Thermodynamic Behavior: From The Stable to the Deep Supercooled Regime

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Mallamace, Francesco, Mensitieri, Giuseppe, Mallamace, Domenico, Salzano de Luna, Martina, Chen, Sow-Hsin, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Mallamace, Francesco, Mensitieri, Giuseppe, Mallamace, Domenico, Salzano de Luna, Martina, and Chen, Sow-Hsin

Abstract

Liquid water is considered to be a peculiar example of glass forming materials because of the possibility of giving rise to amorphous phases with different densities and of the thermodynamic anomalies that characterize its supercooled liquid phase. In the present work, literature data on the density of bulk liquid water are analyzed in a wide temperature-pressure range, also including the glass phases. A careful data analysis, which was performed on different density isobars, made in terms of thermodynamic response functions, like the thermal expansion αPemantics> and the specific heat differences CP−CVemantics>, proves, exclusively from the experimental data, the thermodynamic consistence of the liquid-liquid transition hypothesis. The study confirms that supercooled bulk water is a mixture of two liquid “phases”, namely the high density (HDL) and the low density (LDL) liquids that characterize different regions of the water phase diagram. Furthermore, the CP−CVemantics> isobars behaviors clearly support the existence of both a liquid–liquid transition and of a liquid–liquid critical point.

Published
2021

4. The synergistic effect of an imidazolium salt and benzotriazole on the protection of bronze surfaces with chitosan-based coatings

Author

Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, Schrekker, Henri Stephan, Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, and Schrekker, Henri Stephan

Published
2020
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5. The synergistic effect of an imidazolium salt and benzotriazole on the protection of bronze surfaces with chitosan-based coatings

Author

Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, Schrekker, Henri Stephan, Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, and Schrekker, Henri Stephan

Published
2020
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6. The synergistic effect of an imidazolium salt and benzotriazole on the protection of bronze surfaces with chitosan-based coatings

Author

Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, Schrekker, Henri Stephan, Silva da Conceição, Debora Kelen, Nunes de Almeida, Kauana, Nhuch, Elsa, Raucci, Maria Grazia, Santillo, Chiara, Salzano de Luna, Martina, Ambrosio, Luigi, Lavorgna, Marino, Giuliani, Chiara, Di Carlo, Gabriella, Staccioli, Maria Paola, Falcade, Tiago, and Schrekker, Henri Stephan

Published
2020
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9. Optimization of dye adsorption capacity and mechanical strength of chitosan aerogels through crosslinking strategy and graphene oxide addition

Author

Salzano de Luna, Martina, Ascione, Chiara, Santillo, Chiara, Verdolotti, Letizia, Lavorgna, Marino, Buonocore, Giovanna Giuliana, Castaldo, Rachele, Filippone, Giovanni, Xia, Hesheng, Ambrosio, Luigi, Salzano de Luna, Martina, Ascione, Chiara, Santillo, Chiara, Verdolotti, Letizia, Lavorgna, Marino, Buonocore, Giovanna Giuliana, Castaldo, Rachele, Filippone, Giovanni, Xia, Hesheng, and Ambrosio, Luigi

Published
2019
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10. Optimization of dye adsorption capacity and mechanical strength of chitosan aerogels through crosslinking strategy and graphene oxide addition

Author

Salzano de Luna, Martina, Ascione, Chiara, Santillo, Chiara, Verdolotti, Letizia, Lavorgna, Marino, Buonocore, Giovanna Giuliana, Castaldo, Rachele, Filippone, Giovanni, Xia, Hesheng, Ambrosio, Luigi, Salzano de Luna, Martina, Ascione, Chiara, Santillo, Chiara, Verdolotti, Letizia, Lavorgna, Marino, Buonocore, Giovanna Giuliana, Castaldo, Rachele, Filippone, Giovanni, Xia, Hesheng, and Ambrosio, Luigi

Published
2019
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15. Optimization of dye adsorption capacity and mechanical strength of chitosan aerogels through crosslinking strategy and graphene oxide addition

Author

Salzano de Luna, Martina, Ascione, Chiara, Santillo, Chiara, Verdolotti, Letizia, Lavorgna, Marino, Buonocore, Giovanna Giuliana, Castaldo, Rachele, Filippone, Giovanni, Xia, Hesheng, Ambrosio, Luigi, Salzano de Luna, Martina, Ascione, Chiara, Santillo, Chiara, Verdolotti, Letizia, Lavorgna, Marino, Buonocore, Giovanna Giuliana, Castaldo, Rachele, Filippone, Giovanni, Xia, Hesheng, and Ambrosio, Luigi

Published
2019
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16. Chitosan-based coatings for corrosion protection of copper-based alloys: A promising more sustainable approach for cultural heritage applications

Author

Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, Di Carlo, Gabriella, Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, and Di Carlo, Gabriella

Published
2018
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17. Long-Lasting Efficacy of Coatings for Bronze Artwork Conservation: The Key Role of Layered Double Hydroxide Nanocarriers in Protecting Corrosion Inhibitors from Photodegradation

Author

Salzano de Luna, Martina, Buonocore, Giovanna G., Giuliani, Chiara, Messina, Elena, Di Carlo, Gabriella, Lavorgna, Marino, Ambrosio, Luigi, Ingo, Gabriel M., Salzano de Luna, Martina, Buonocore, Giovanna G., Giuliani, Chiara, Messina, Elena, Di Carlo, Gabriella, Lavorgna, Marino, Ambrosio, Luigi, and Ingo, Gabriel M.

Published
2018
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18. Chitosan-based coatings for corrosion protection of copper-based alloys: A promising more sustainable approach for cultural heritage applications

Author

Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, Di Carlo, Gabriella, Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, and Di Carlo, Gabriella

Published
2018
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19. Long-Lasting Efficacy of Coatings for Bronze Artwork Conservation: The Key Role of Layered Double Hydroxide Nanocarriers in Protecting Corrosion Inhibitors from Photodegradation

Author

Salzano de Luna, Martina, Buonocore, Giovanna G., Giuliani, Chiara, Messina, Elena, Di Carlo, Gabriella, Lavorgna, Marino, Ambrosio, Luigi, Ingo, Gabriel M., Salzano de Luna, Martina, Buonocore, Giovanna G., Giuliani, Chiara, Messina, Elena, Di Carlo, Gabriella, Lavorgna, Marino, Ambrosio, Luigi, and Ingo, Gabriel M.

Published
2018
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20. Chitosan-based coatings for corrosion protection of copper-based alloys: A promising more sustainable approach for cultural heritage applications

Author

Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, Di Carlo, Gabriella, Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, and Di Carlo, Gabriella

Published
2018
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21. Chitosan-based coatings for corrosion protection of copper-based alloys: A promising more sustainable approach for cultural heritage applications

Author

Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, Di Carlo, Gabriella, Giuliani, Chiara, Pascucci, Marianna, Riccucci, Cristina, Messina, Elena, Salzano de Luna, Martina, Lavorgna, Marino, Ingo, Gabriel Maria, and Di Carlo, Gabriella

Published
2018
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22. Long-Lasting Efficacy of Coatings for Bronze Artwork Conservation: The Key Role of Layered Double Hydroxide Nanocarriers in Protecting Corrosion Inhibitors from Photodegradation

Author

Salzano de Luna, Martina, Buonocore, Giovanna G., Giuliani, Chiara, Messina, Elena, Di Carlo, Gabriella, Lavorgna, Marino, Ambrosio, Luigi, Ingo, Gabriel M., Salzano de Luna, Martina, Buonocore, Giovanna G., Giuliani, Chiara, Messina, Elena, Di Carlo, Gabriella, Lavorgna, Marino, Ambrosio, Luigi, and Ingo, Gabriel M.

Published
2018
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37. Dynamics and Structures of Nanoparticles in Polymer Melts

Author

Salzano de Luna, Martina and Salzano de Luna, Martina

Abstract

The possibility of combining the physical properties of different components to obtain materials with new structural or functional features is what really makes polymer nanocomposites attractive. Actually, to fully exploit the potential of such a class of materials, the morphological and structural implications stemming from the nanometric sizes of the filler have to be taken into account. In the present dissertation, the physical mechanisms governing the nanoparticle dynamics and connectivity in polymer melts are investigated from a fundamental point of view. For such a purpose, the linear viscoelastic response of polymer nanocomposites has been deeply studied and morphological analyses have been used as support. As thermodynamically out-of-equilibrium materials, if provided by sufficient energy, polymer nanocomposites evolve to achieve equilibrium. In this process, the nanoparticles rearrange themselves in the melt and typically aggregate, dictating the ultimate microstructure of the material from which its macroscopic performances depend. In the first part of the study, the key role of the mobility of nanoparticles on their dynamics of assembly has been highlighted. The investigation then focuses on the rheological implications of the superstructures formed by the nanoparticles when they are free to rearrange in the host polymer medium. A simple two-phase model, recently proposed in the literature, has been used for such a purpose. First, the ability of the model in recognizing the elasticity of filler networks too weak to be identified by conventional viscoelastic analyses has been demonstrated. More importantly, the generalization of the model has been proposed and validated, proving that it is able to describe the linear viscoelasticity of polymer nanocomposites differing among them both in the nature of the nanoparticles and in the affinity between the polymer and filler phases. A further test of the robustness of the approach is given by verifying the possib

Published
2015

38. Dynamics and Structures of Nanoparticles in Polymer Melts

Author

Salzano de Luna, Martina and Salzano de Luna, Martina

Abstract

The possibility of combining the physical properties of different components to obtain materials with new structural or functional features is what really makes polymer nanocomposites attractive. Actually, to fully exploit the potential of such a class of materials, the morphological and structural implications stemming from the nanometric sizes of the filler have to be taken into account. In the present dissertation, the physical mechanisms governing the nanoparticle dynamics and connectivity in polymer melts are investigated from a fundamental point of view. For such a purpose, the linear viscoelastic response of polymer nanocomposites has been deeply studied and morphological analyses have been used as support. As thermodynamically out-of-equilibrium materials, if provided by sufficient energy, polymer nanocomposites evolve to achieve equilibrium. In this process, the nanoparticles rearrange themselves in the melt and typically aggregate, dictating the ultimate microstructure of the material from which its macroscopic performances depend. In the first part of the study, the key role of the mobility of nanoparticles on their dynamics of assembly has been highlighted. The investigation then focuses on the rheological implications of the superstructures formed by the nanoparticles when they are free to rearrange in the host polymer medium. A simple two-phase model, recently proposed in the literature, has been used for such a purpose. First, the ability of the model in recognizing the elasticity of filler networks too weak to be identified by conventional viscoelastic analyses has been demonstrated. More importantly, the generalization of the model has been proposed and validated, proving that it is able to describe the linear viscoelasticity of polymer nanocomposites differing among them both in the nature of the nanoparticles and in the affinity between the polymer and filler phases. A further test of the robustness of the approach is given by verifying the possib

Published
2015

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