| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Vitillo, Jenny Grazia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2018Understanding and Controlling the Dielectric Response of Metal–Organic Frameworkscitations
- 2018Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorptioncitations
- 2018On the structure of superbasic (MgO)n sites solvated in a faujasite zeolitecitations
- 2018Structure and Host–Guest Interactions of Perylene–Diimide Dyes in Zeolite L Nanochannelscitations
- 2017Core-Shell Structure of Palladium Hydride Nanoparticles Revealed by Combined X-ray Absorption Spectroscopy and X-ray Diffractioncitations
- 2014Evolution and reversibility of host/guest interactions with temperature changes in a methyl red@palygorskite polyfunctional hybrid nanocompositecitations
- 2012Evolution of host/guest interactions with heating in a palygorskite/methyl red (Maya Red) hybrid composite
- 2012Monolithic nanoporous-crystalline aerogels based on PPOcitations
- 2011Crystal structure refinement of a sepiolite/indigo Maya Blue pigment using molecular modelling and synchrotron diffractioncitations
- 2011Nanoporous crystalline phases of poly(2,6-dimethyl-1,4-phenylene)oxidecitations
- 2011Combined study of structural properties of metal-organic frameworks changing organic linkers and metal centers
- 2011Aerogels and polymorphism of isotactic poly(4-methyl-pentene-1)citations
- 2011Structure and thermodynamic properties of the NaMgH3 perovskitecitations
- 2011Structure-activity relationships of simple molecules adsorbed on MOF materials: in situ experiments vs. theory
- 2010Hydrogen adsorption by δ and ε crystalline phases of syndiotactic polystyrene aerogelscitations
- 2010Storage of hydrogen as a guest of a nanoporous polymeric crystalline phasecitations
- 2010Hydrogen adsorption by delta and epsilon crystalline phases of syndiotactic polystirene aerogelscitations
- 2009CO adsorption on CPO-27-Ni coordination polymer: spectroscopic features and interaction energycitations
- 2009CO adsorption on cpo-27-ni coordination polymercitations
- 2008Oriented TiO2 nanostructured pillar arrayscitations
- 2008Local structure of CPO-27-Ni metallorganic framework upon dehydration and coordination of NOcitations
Places of action
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article
Evolution and reversibility of host/guest interactions with temperature changes in a methyl red@palygorskite polyfunctional hybrid nanocomposite
Abstract
Palygorskite is a microporous clay mineral with several important applications, including use as dye nano-scaffold, due to its ability to incorporate apt guest molecules and form exceptionally stable composites. Such a property covers widespread fields of interest, from pottery pigments to light harvesting. In all these applications, the stability of these composites at progressively increasing temperatures is an important parameter to determine their condition of usage. This work investigates the nature and strength of the stabilizing host/guest interactions at the basis of the exceptional stability of the methyl red@palygorskite composite system, which undergo a dynamic but reversible evolution depending on the level of heating. A multi-technique analytical protocol involving synchrotron X-ray powder diffraction (S-XRPD) and thermogravimetric analysis (TGA) coupled with infrared spectroscopy (FT-IR) and gas chromatography (GC-MS) was followed, which allowed to sharply identify the species evolved during heating. Moderate temperatures (140°-300°C) cause stabilization of H-bonds between the structural H2O and the carboxyl group of the dye, whereas higher ones (> 300°C) trigger formation of direct COOH/octahedral Mg bonds favoured by dehydration. Cooling below 300°C implies gradual reversibility of the observed trend due to rehydration from environmental moisture; additional heating (> 400°C), conversely, causes methyl red decomposition, fragmentation and further expulsion from the host tunnels ( 500°C). The encapsulated dye in zwitterionic, trans and/or protonated form affects the hosting system properties, preventing structural folding and strongly modifying the mechanism of water release for both structural and zeolitic H2O. Experimental results were interpreted also with the help of structural models obtained by molecular mechanics simulations, offering atomistic insights on the mechanisms at the basis of the observed phenomena.