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2. Optical grade bromide-based thin film electrolytes

Author

Melchioni, Nicola, Trupiano, Giacomo, Tofani, Giorgio, Bertini, Riccardo, Mezzetta, Andrea, Bianco, Federica, Guazzelli, Lorenzo, Beltram, Fabio, Pomelli, Christian Silvio, Roddaro, Stefano, Tredicucci, Alessandro, and Paolucci, Federico

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science, Physics - Optics
Abstract

Controlling the charge density in low-dimensional materials with an electrostatic potential is a powerful tool to explore and influence their electronic and optical properties. Conventional solid gates impose strict geometrical constraints to the devices and often absorb electromagnetic radiation in the infrared (IR) region. A powerful alternative is ionic liquid (IL) gating. This technique only needs a metallic electrode in contact with the IL and the highest achievable electric field is limited by the electrochemical interactions of the IL with the environment. Despite the excellent gating properties, a large number of ILs is hardly exploitable for optical experiments in the mid-IR region, because they typically suffer from low optical transparency and degradation in ambient conditions. Here, we report the realization of two electrolytes based on bromide ILs dissolved in polymethyl methacrylate (PMMA). We demonstrate that such electrolytes can induce state-of-the-art charge densities as high as $20\times10^{15}\ \mathrm{cm^{-2}}$. Thanks to the low water absorption of PMMA, they work both in vacuum and in ambient atmosphere after a simple vacuum curing. Furthermore, our electrolytes can be spin coated into flat thin films with optical transparency in the range from 600 cm$^{-1}$ to 4000 cm$^{-1}$. Thanks to these properties, the electrolytes are excellent candidates to fill the gap as versatile gating layers for electronic and mid-IR optoelectronic devices., Comment: 15 pages, 4 figures

Published
2023
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10. A Combined Experimental/Computational Study of Dicationic Ionic Liquids with Bromide and Tungstate Anions.

Author

Cardoso Gomes, Guelber, Ferdeghini, Claudio, Guglielmero, Luca, D'Andrea, Felicia, Guazzelli, Lorenzo, Mezzetta, Andrea, and Pomelli, Christian Silvio

Subjects
IONIC liquids, ANIONS, TUNGSTATES, BROMIDES, CATALYTIC activity
Abstract

A panel of dicationic ionic liquids (DILs) with different rigid xylyl (ortho, meta, para) spacers and different anions (bromide and tungstate) has been synthetised and characterised through different experimental and computational techniques. Differences and analogies between the systems are analysed using information derived from their DFT structures, semiempirical dynamics, thermal behaviour, and catalytic properties versus the well-known reaction of CO2 added to epichlorohydrin. A comparison between the proposed systems and some analogues that present non-rigid spacers shows the key effect displayed by structure rigidity on their characteristics. The results show an interesting correlation between structure, flexibility, properties, and catalytic activity. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Hydrogen Sulfide and Ionic Liquids: Absorption, Separation, and Oxidation

Author

Chiappe, Cinzia, Pomelli, Christian Silvio, Wong, Wai-Yeung, Editor-in-Chief, Olivucci, Massimo, Editor-in-Chief, Bayley, Hagan, Series Editor, Hughes, Greg, Series Editor, Hunter, Christopher A., Series Editor, Hwang, Seong-Ju, Series Editor, Ishihara, Kazuaki, Series Editor, Kirchner, Barbara, Series Editor, Krische, Michael J., Series Editor, Larsen, Delmar, Series Editor, Lehn, Jean-Marie, Series Editor, Luque, Rafael, Series Editor, Siegel, Jay S., Series Editor, Thiem, Joachim, Series Editor, Venturi, Margherita, Series Editor, Wong, Chi-Huey, Series Editor, Wong, Henry N.C., Series Editor, Yam, Vivian Wing-Wah, Series Editor, Yan, Chunhua, Series Editor, You, Shu-Li, Series Editor, and Perlt, Eva, editor

Published
2018
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21. Optical grade bromide-based thin film electrolytes

Author

Melchioni, Nicola, primary, Trupiano, Giacomo, additional, Tofani, Giorgio, additional, Bertini, Riccardo, additional, Mezzetta, Andrea, additional, Bianco, Federica, additional, Guazzelli, Lorenzo, additional, Beltram, Fabio, additional, Pomelli, Christian Silvio, additional, Roddaro, Stefano, additional, Tredicucci, Alessandro, additional, and Paolucci, Federico, additional

Published
2023
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22. Betaine mediated enhancement of thermal stability and acidity tolerance of vanadium(V) solutions.

Author

Guglielmero, Luca, Mezzetta, Andrea, D'Andrea, Felicia, Guazzelli, Lorenzo, and Pomelli, Christian Silvio

Subjects
VANADIUM, BETAINE, THERMAL stability, ACIDITY, FLOW batteries, THERMAL analysis
Abstract

A panel of novel vanadium(IV)–betaine complexes has been synthesized according to new and efficient methodologies and characterized through both spectroscopic techniques and thermal analyses. Vanadium(IV)–betaine solutions have been electrochemically oxidized and the effect of betaine ligands on the thermal and pH stability of vanadium(V) solutions has been evaluated under different temperature and acidity conditions. The obtained results displayed a remarkable effect for both of the examined parameters, achieving the preparation of aqueous vanadium(V) solutions displaying long term stability at more than 55 °C under mild acidic conditions. The species formed in the betaine rich vanadium(V) solutions have been sprectroscopically identified in relationship with the acidity of the solution, and the obtained results were confirmed through computational techniques. Vanadium–betaine based solutions have been finally tested in a lab-scale redox flow battery setup, providing preliminary insight into the possible use of this type of electrolyte in VRFBs. [ABSTRACT FROM AUTHOR]

Published
2023
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23. Structural Features and Properties of Metal Complexes in Ionic Liquids: Application in Alkylation Reactions

Author

Chiappe, Cinzia, Ghilardi, Tiziana, Pomelli, Christian Silvio, Beller, Matthias, Series editor, Brown, John M., Series editor, Dixneuf, Pierre H., Series editor, Dupont, Jairton, Series editor, Fürstner, Alois, Series editor, Glorius, Frank, Series editor, Gooßen, Lukas J., Series editor, Ikariya, Takao, Series editor, Nolan, Steve, Series editor, Okuda, Jun, Series editor, Oro, Luis A., Series editor, Zhou, Qi-Lin, Series editor, and Kollár, László, editor

Published
2015
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42. Influence of the interaction between hydrogen sulfide and ionic liquids on solubility: experimental and theoretical investigation

Author

Pomelli, Christian Silvio, Chiappe, Cinzia, Vidis, Ana, Laurenczy, Gabor, and Dyson, Paul J.

Subjects
Hydrogen sulfide -- Research, Hydrogen sulfide -- Chemical properties, Ionic solutions -- Research, Ionic solutions -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The behavior of [H.sub.2]S in several ionic liquids (ILs) is investigated. Results show extremely high solubilities in ILs suggesting the occurrence of specific interactions between H2S and the examined ILs.

Published
2007

49. pH-Responsive Nanostructures Based on Surface Active Fatty Acid-Protic Ionic Liquids for Imiquimod Delivery in Skin Cancer Topical Therapy

Author

Tampucci, Silvia, primary, Guazzelli, Lorenzo, additional, Burgalassi, Susi, additional, Carpi, Sara, additional, Chetoni, Patrizia, additional, Mezzetta, Andrea, additional, Nieri, Paola, additional, Polini, Beatrice, additional, Pomelli, Christian Silvio, additional, Terreni, Eleonora, additional, and Monti, Daniela, additional

Published
2020
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