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Bérerd N, Moncoffre N, Martinet P, Marcelin S, Baux D, Normand B. Influence of Water Radiolysis on the Passive Properties of 316L-Stainless Steel. Chemphyschem 2024:e202300785. [PMID: 38837507 DOI: 10.1002/cphc.202300785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 05/30/2024] [Accepted: 05/31/2024] [Indexed: 06/07/2024]
Abstract
This work aims to study the effect of radiolytic species induced by water radiolysis on the passive behavior of 316L stainless steel. For this purpose, the stainless steel/neutral and aerated 0.02 M Na2SO4, electrolyte solution interface was irradiated with proton beams. A wide range of energies between 2 and 16 MeV was selected, varying the maximum of the energy deposition between 0.5 and 122 μm in water from the interface. The irradiation experiments were performed at the CEMHTI cyclotron in Orléans and the 4 MV Van de Graaff accelerator at IP2I in Lyon (France). A dedicated irradiation device implemented with a 3-electrode cell dedicated to perform electrochemical measurements allows to measure the surface reactivity of the stainless steel as a function of the irradiation conditions. Results show that whatever the beam energy, the corrosion potential remains unchanged. It indicates that the very short-lived, highly reactive radiolytic species drive the corrosion potential and not only the recombination products such H2O2 or H2. The stainless steel remains in the passive state whatever the irradiation conditions. However, it is shown that, during irradiation, the passive film is less protective. This evolution is attributed to radiolysis of bound water molecules in the passive film.
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Affiliation(s)
- Nicolas Bérerd
- Institut de Physique des 2 Infinis de Lyon (UMR5822), MATiCE, CNRS/Université Lyon 1 et IUT Lyon 1, 4, rue Enrico Fermi, F-69622, Villeurbanne Cedex, France
| | - Nathalie Moncoffre
- Institut de Physique des 2 Infinis de Lyon (UMR5822), MATiCE, CNRS/Université Lyon 1 et IUT Lyon 1, 4, rue Enrico Fermi, F-69622, Villeurbanne Cedex, France
| | - Philippe Martinet
- Institut de Physique des 2 Infinis de Lyon (UMR5822), MATiCE, CNRS/Université Lyon 1 et IUT Lyon 1, 4, rue Enrico Fermi, F-69622, Villeurbanne Cedex, France
- Matériaux: Ingénierie et Science (UMR5510), INSA >Lyon, Campus LyonTech La Doua, 20 avenue Albert Einstein, F-69621, Villeurbanne cedex, France
| | - Sabrina Marcelin
- Matériaux: Ingénierie et Science (UMR5510), INSA >Lyon, Campus LyonTech La Doua, 20 avenue Albert Einstein, F-69621, Villeurbanne cedex, France
| | - Dominique Baux
- CEMHTI (UPR3079), CNRS, Site Cyclotron, CS 30058, 3 A rue de la Férollerie, F-45071, Orléans Cedex, France
| | - Bernard Normand
- Matériaux: Ingénierie et Science (UMR5510), INSA >Lyon, Campus LyonTech La Doua, 20 avenue Albert Einstein, F-69621, Villeurbanne cedex, France
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Binder J, Dabrowska AK, Tokarczyk M, Ludwiczak K, Bozek R, Kowalski G, Stepniewski R, Wysmolek A. Epitaxial Hexagonal Boron Nitride for Hydrogen Generation by Radiolysis of Interfacial Water. NANO LETTERS 2023; 23:1267-1272. [PMID: 36689737 PMCID: PMC9951249 DOI: 10.1021/acs.nanolett.2c04434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 01/16/2023] [Indexed: 06/17/2023]
Abstract
Hydrogen is an important building block in global strategies toward a future green energy system. To make this transition possible, intense scientific efforts are needed, also in the field of materials science. Two-dimensional crystals, such as hexagonal boron nitride (hBN), are very promising in this regard, as it has been demonstrated that micrometer-sized flakes are excellent barriers to molecular hydrogen. However, it remains an open question whether large-area layers fabricated by industrially relevant methods preserve such promising properties. In this work, we show that electron-beam-induced splitting of water creates hBN bubbles that effectively store molecular hydrogen for weeks and under extreme mechanical deformation. We demonstrate that epitaxial hBN allows direct visualization and monitoring of the process of hydrogen generation by radiolysis of interfacial water. Our findings show that hBN is not only a potential candidate for hydrogen storage but also holds promise for the development of unconventional hydrogen production schemes.
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Ialyshev V, Boltaev G, Iqbal M, Khamis M, Alnaser AS. Enhancing Gas Solubility in Water via Femtosecond Laser-Induced Plasma. ACS OMEGA 2022; 7:28182-28189. [PMID: 35990450 PMCID: PMC9386792 DOI: 10.1021/acsomega.2c02384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
The generation of laser-induced plasma at the gas-liquid interface provides many fundamental and interesting scientific phenomena such as ionization, sharp explosion, shock wave radiation, bubble creation, and water splitting. However, despite the extensive research in this area, there is no reference on the effect of the surrounding environment on the chemical processes that occur during the laser-induced plasma-water interaction. In this work, we investigate the effect of the surrounding gas environment on femtosecond laser-induced plasma when generated at the pure water-gas interface. Ultrashort laser pulses were applied to water in the presence of air and N2 and Ar gas environments. Formation of a significant number of nitrate-based species in water was observed after exposure to femtosecond laser-induced plasma in air and N2 environments. The detected NO3 ions formed in the laser-treated water led to the appearance of an absorption peak in the UV range, a significant decrease in the water pH value, and a significant increase in water's electrical conductivity. All induced properties of water were stable for 3 months of monitoring after laser treatment. Our work shows that the generation of laser-induced plasma in water propagating into a gaseous medium facilitates the interaction between the two media, as a result of which the compositions of substances present in the gaseous medium can be dissolved in water without increasing the gas pressure. The presented approach may find applications in areas such as water purification, material synthesis, and environmental stewardship.
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Affiliation(s)
- Vadim Ialyshev
- Department
of Physics, American University of Sharjah, Sharjah 26666, UAE
| | - Ganjaboy Boltaev
- Department
of Physics, American University of Sharjah, Sharjah 26666, UAE
| | - Mazhar Iqbal
- Department
of Physics, American University of Sharjah, Sharjah 26666, UAE
| | - Mustafa Khamis
- Department
of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah 26666, UAE
| | - Ali S. Alnaser
- Department
of Physics, American University of Sharjah, Sharjah 26666, UAE
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4
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Investigation of mechanisms of radiolytic H2 production in C-S-H: Influence of water content and radiation induced defects. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Pignié MC, Shcherbakov V, Charpentier T, Moskura M, Carteret C, Denisov S, Mostafavi M, Thill A, Le Caër S. Confined water radiolysis in aluminosilicate nanotubes: the importance of charge separation effects. NANOSCALE 2021; 13:3092-3105. [PMID: 33522536 DOI: 10.1039/d0nr08948f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Imogolite nanotubes are potentially promising co-photocatalysts because they are predicted to have curvature-induced, efficient electron-hole pair separation. This prediction has however not yet been experimentally proven. Here, we investigated the behavior upon irradiation of these inorganic nanotubes as a function of their water content to understand the fate of the generated electrons and holes. Two types of aluminosilicate nanotubes were studied: one was hydrophilic on its external and internal surfaces (IMO-OH) and the other had a hydrophobic internal cavity due to Si-CH3 bonds (IMO-CH3), with the external surface remaining hydrophilic. Picosecond pulse radiolysis experiments demonstrated that the electrons are efficiently driven outward. For imogolite samples with very few external water molecules (around 1% of the total mass), quasi-free electrons were formed. They were able to attach to a water molecule, generating a water radical anion, which ultimately led to dihydrogen. When more external water molecules were present, solvated electrons, precursors of dihydrogen, were formed. In contrast, holes moved towards the internal surface of the tubes. They mainly led to the formation of dihydrogen and of methane in irradiated IMO-CH3. The attachment of the quasi-free electron to water was a very efficient process and accounted for the high dihydrogen production at low relative humidity values. When the water content increased, electron solvation dominated over attachment to water molecules. Electron solvation led to dihydrogen production, albeit to a lesser extent than quasi-free electrons. Our experiments demonstrated the spontaneous curvature-induced charge separation in these inorganic nanotubes, making them very interesting potential co-photocatalysts.
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Affiliation(s)
- Marie-Claire Pignié
- NIMBE, UMR 3685 CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France.
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Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method. NANOMATERIALS 2020; 10:nano10091823. [PMID: 32932706 PMCID: PMC7559070 DOI: 10.3390/nano10091823] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/02/2020] [Accepted: 09/10/2020] [Indexed: 11/27/2022]
Abstract
Magnetic polymer gels are a new promising class of nanocomposite gels. In this work, magnetic PEO/iron oxide nanocomposite hydrogels were synthesized using the one-step γ-irradiation method starting from poly(ethylene oxide) (PEO) and iron(III) precursor alkaline aqueous suspensions followed by simultaneous crosslinking of PEO chains and reduction of Fe(III) precursor. γ-irradiation dose and concentrations of Fe3+, 2-propanol and PEO in the initial suspensions were varied and optimized. With 2-propanol and at high doses magnetic gels with embedded magnetite nanoparticles were obtained, as confirmed by XRD, SEM and Mössbauer spectrometry. The quantitative determination of γ-irradiation generated Fe2+ was performed using the 1,10-phenanthroline method. The maximal Fe2+ molar fraction of 0.55 was achieved at 300 kGy, pH = 12 and initial 5% of Fe3+. The DSC and rheological measurements confirmed the formation of a well-structured network. The thermal and rheological properties of gels depended on the dose, PEO concentration and initial Fe3+ content (amount of nanoparticles synthesized inside gels). More amorphous and stronger gels were formed at higher dose and higher nanoparticle content. The properties of synthesized gels were determined by the presence of magnetic iron oxide nanoparticles, which acted as reinforcing agents and additional crosslinkers of PEO chains thus facilitating the one-step gel formation.
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Influence of calcium to silica ratio on H2 gas production in calcium silicate hydrate. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2019.04.035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Soft X-ray Heterogeneous Radiolysis of Pyridine in the Presence of Hydrated Strontium-Hydroxyhectorite and its Monitoring by Near-Ambient Pressure Photoelectron Spectroscopy. Sci Rep 2018; 8:6164. [PMID: 29670155 PMCID: PMC5906652 DOI: 10.1038/s41598-018-24329-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 03/22/2018] [Indexed: 11/15/2022] Open
Abstract
The heterogeneous radiolysis of organic molecules in clays is a matter of considerable interest in astrochemistry and environmental sciences. However, little is known about the effects of highly ionizing soft X-rays. By combining monochromatized synchrotron source irradiation with in situ Near Ambient Pressure X-ray Photoelectron Spectroscopy (in the mbar range), and using the synoptic view encompassing both the gas and condensed phases, we found the water and pyridine pressure conditions under which pyridine is decomposed in the presence of synthetic Sr2+-hydroxyhectorite. The formation of a pyridine/water/Sr2+ complex, detected from the Sr 3d and N 1s core-level binding energies, likely presents a favorable situation for the radiolytic breaking of the O-H bond of water molecules adsorbed in the clay and the subsequent decomposition of the molecule. However, decomposition stops when the pyridine pressure exceeds a critical value. This observation can be related to a change in the nature of the active radical species with the pyridine loading. This highlights the fact that the destruction of the molecule is not entirely determined by the properties of the host material, but also by the inserted organic species. The physical and chemical causes of the present observations are discussed.
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9
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Wang F, Pernot P, Archirel P, Schmidhammer U, Ortiz D, Le Caër S, Mostafavi M. Observation and Simulation of Transient Anion Oligomers (LiClO4)n– (n = 1–4) in Diethyl Carbonate LiClO4 Solutions. J Phys Chem B 2017; 121:7464-7472. [DOI: 10.1021/acs.jpcb.7b04982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Furong Wang
- Laboratoire
de Chimie-Physique/ELYSE, UMR 8000 CNRS/UPS, Université Paris Sud, Bât. 349, F-91405 Orsay Cedex, France
| | - Pascal Pernot
- Laboratoire
de Chimie-Physique/ELYSE, UMR 8000 CNRS/UPS, Université Paris Sud, Bât. 349, F-91405 Orsay Cedex, France
| | - Pierre Archirel
- Laboratoire
de Chimie-Physique/ELYSE, UMR 8000 CNRS/UPS, Université Paris Sud, Bât. 349, F-91405 Orsay Cedex, France
| | - Uli Schmidhammer
- Laboratoire
de Chimie-Physique/ELYSE, UMR 8000 CNRS/UPS, Université Paris Sud, Bât. 349, F-91405 Orsay Cedex, France
| | - Daniel Ortiz
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris-Saclay, CEA Saclay Bât. 546, F-91191 Gif-sur-Yvette Cedex, France
| | - Sophie Le Caër
- LIONS, NIMBE, UMR 3685, CEA, CNRS, Université Paris-Saclay, CEA Saclay Bât. 546, F-91191 Gif-sur-Yvette Cedex, France
| | - Mehran Mostafavi
- Laboratoire
de Chimie-Physique/ELYSE, UMR 8000 CNRS/UPS, Université Paris Sud, Bât. 349, F-91405 Orsay Cedex, France
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10
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Giorla AB, Le Pape Y, Dunant CF. Computing Creep-Damage Interactions in Irradiated Concrete. JOURNAL OF NANOMECHANICS AND MICROMECHANICS 2017. [DOI: 10.1061/(asce)nm.2153-5477.0000118] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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11
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Lainé M, Balan E, Allard T, Paineau E, Jeunesse P, Mostafavi M, Robert JL, Le Caër S. Reaction mechanisms in swelling clays under ionizing radiation: influence of the water amount and of the nature of the clay mineral. RSC Adv 2017. [DOI: 10.1039/c6ra24861f] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Picosecond pulse radiolysis experiments performed on natural swelling clays evidence a fast trapping of electrons in the layers of the material.
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Affiliation(s)
- M. Lainé
- LIONS
- NIMBE
- CEA
- CNRS
- Université Paris Saclay
| | - E. Balan
- IMPMC
- Sorbonne Universities
- UPMC
- CNRS UMR-7590
- MNHN
| | - T. Allard
- IMPMC
- Sorbonne Universities
- UPMC
- CNRS UMR-7590
- MNHN
| | - E. Paineau
- Laboratoire de Physique des Solides
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- F-91405 Orsay Cedex
| | - P. Jeunesse
- Laboratoire de Chimie Physique
- CNRS/Université Paris-Sud
- F-91405 Orsay
- France
| | - M. Mostafavi
- Laboratoire de Chimie Physique
- CNRS/Université Paris-Sud
- F-91405 Orsay
- France
| | | | - S. Le Caër
- LIONS
- NIMBE
- CEA
- CNRS
- Université Paris Saclay
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12
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Application of Radiation Chemistry to Some Selected Technological Issues Related to the Development of Nuclear Energy. Top Curr Chem (Cham) 2016; 374:60. [DOI: 10.1007/s41061-016-0058-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/22/2016] [Indexed: 10/21/2022]
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13
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Frances L, Grivet M, Renault JP, Groetz JE, Ducret D. Hydrogen radiolytic release from zeolite 4A/water systems under γ irradiations. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.01.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Rébufa C, Traboulsi A, Labed V, Dupuy N, Sergent M. Experimental design approach for identification of the factors influencing the γ-radiolysis of ion exchange resins. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2014.07.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Fourdrin C, Aarrachi H, Latrille C, Esnouf S, Bergaya F, Le Caër S. Water radiolysis in exchanged-montmorillonites: the H2 production mechanisms. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9530-7. [PMID: 23875719 DOI: 10.1021/es401490t] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The radiolysis of water confined in montmorillonites is studied as a function of the composition of the montmorillonite, the nature of the exchangeable cation, and the relative humidity by following the H2 production under electron irradiation. It is shown that the main factor influencing this H2 production is the water amount in the interlayer space. The effect of the exchangeable cation is linked to its hydration enthalpy. When the water amount is high enough to get a basal distance higher than 1.3 nm, then a total energy transfer from the montmorillonite sheets to the interlayer space occurs, and the H2 production measured is very similar to the one obtained in bulk water. For a basal distance smaller than 1.3 nm, the H2 production increases with the relative humidity and thus with the water amount. Lastly, electron paramagnetic resonance measurements evidence the formation of a new defect induced by ionizing radiation. It consists of a hydrogen radical (H2 precursor) trapped in the structure. This implies that structural hydroxyl bonds can be broken under irradiation, potentially accounting for the observed H2 production.
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Affiliation(s)
- C Fourdrin
- Laboratoire des Solides Irradiés, UMR 7642, Ecole Polytechnique, F-91128 Palaiseau Cedex, France.
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16
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Jurkin T, Pucić I. Irradiation effects in poly(ethylene oxide)/silica nanocomposite films and gels. POLYM ENG SCI 2013. [DOI: 10.1002/pen.23611] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tanja Jurkin
- Division of Materials Chemistry; Ruđer Bošković Institute; Bijenička 54 Zagreb Croatia
| | - Irina Pucić
- Division of Materials Chemistry; Ruđer Bošković Institute; Bijenička 54 Zagreb Croatia
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17
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Dondi D, Buttafava A, Zeffiro A, Bracco S, Sozzani P, Faucitano A. Reaction Mechanisms in Irradiated, Precipitated, and Mesoporous Silica. J Phys Chem A 2013; 117:3304-18. [DOI: 10.1021/jp310683e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- D. Dondi
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
| | - A. Buttafava
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
| | - A. Zeffiro
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
| | - S. Bracco
- Department of Materials Science, University of Milano Bicocca, Via R. Cozzi 53, 20125
Milano, Italy
| | - P. Sozzani
- Department of Materials Science, University of Milano Bicocca, Via R. Cozzi 53, 20125
Milano, Italy
| | - A. Faucitano
- Department of Chemistry, University of Pavia, V.le Taramelli 12, 27100 Pavia, Italy
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18
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Kumagai Y, Kimura A, Taguchi M, Nagaishi R, Yamagishi I, Kimura T. Hydrogen production in gamma radiolysis of the mixture of mordenite and seawater. J NUCL SCI TECHNOL 2013. [DOI: 10.1080/00223131.2013.757453] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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19
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Dondi D, Buttafava A, Zeffiro A, Conzatti L, Faucitano A. The role of silica in radiation induced grafting and crosslinking of silica/elastomers blends. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.08.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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20
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Effect of silica gel on radiation-induced reduction of dichromate ion in aqueous acidic solution. Radiat Phys Chem Oxf Engl 1993 2011. [DOI: 10.1016/j.radphyschem.2011.01.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Water Radiolysis: Influence of Oxide Surfaces on H2 Production under Ionizing Radiation. WATER 2011. [DOI: 10.3390/w3010235] [Citation(s) in RCA: 261] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Musat R, Moreau S, Poidevin F, Mathon MH, Pommeret S, Renault JP. Radiolysis of water in nanoporous gold. Phys Chem Chem Phys 2010; 12:12868-74. [DOI: 10.1039/c0cp00967a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Brodie-Linder N, Le Caër S, Alam MS, Renault JP, Alba-Simionesco C. H2 formation by electron irradiation of SBA-15 materials and the effect of CuII grafting. Phys Chem Chem Phys 2010; 12:14188-95. [DOI: 10.1039/c0cp00115e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Brunet F, Charpentier T, Le Caër S, Renault JP. Solid-state NMR characterization of a controlled-pore glass and of the effects of electron irradiation. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 33:1-11. [PMID: 18234479 DOI: 10.1016/j.ssnmr.2007.12.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2007] [Indexed: 05/25/2023]
Abstract
Controlled-pore glasses (CPGs) are silica-based materials which provide an adequate model system for a better understanding of the radiation chemistry of glasses, especially under nanoscopic confinement. This paper presents a characterization of a nanoporous CPG before and after electron irradiation using multinuclear solid-state magnetic resonance (NMR). 1H MAS NMR has been used for studying the surface proton sites and it is observed that the irradiation leads to a dehydration of the material. Accordingly, concerning the silicon sites near the surface, the observed variation of the Q4, Q3 and Q2 species from 1H-29Si CPMAS spectra shows an increase of the surface polymerization under irradiation, implying in majority a Q2 to Q3/Q4 conversion mechanism. Similarly, 1H-17 O CPMAS measurements exhibit an increase of Si-O-Si groups at the expenses of Si-OH groups. In addition, modifications of the environment of the residual boron atoms are also put in evidence from 11B MAS and MQMAS NMR These data show that MAS NMR methods provide sensitive tools for the characterization of these porous glasses and of the tiny modifications occurring under electron irradiation.
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Affiliation(s)
- F Brunet
- Laboratoire de Structure et de Dynamique par Résonance Magnétique CEA/Saclay, DSM/DRECAM/SCM URA 331 CNRS, F-91191 Gif-sur-Yvette, France.
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25
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Hydrogen peroxide formation in the radiolysis of hydrated nanoporous glasses: A low and high dose rate study. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.10.102] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Le Caër S, Palmer DJ, Lima M, Renault JP, Vigneron G, Righini R, Pommeret S. Time-Resolved Studies of Water Dynamics and Proton Transfer at the Alumina−Air Interface. J Am Chem Soc 2007; 129:11720-9. [PMID: 17725350 DOI: 10.1021/ja0691730] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The present study aims to understand the dynamical properties of water and OH groups layered on an alumina surface mainly by means of femtosecond IR-pump IR-probe transient absorption spectroscopy. The experimental results obtained demonstrate the existence of several kinds of O-H vibrators on the surface of alumina membranes, distinguishing them by their behavior on the femtosecond time scale and by the anisotropy of their spectral response. In the high-frequency region (>3400 cm-1), the absorption is due to well-packed aluminol groups and to physisorbed water patches on the surface. When pumping at 3200 cm-1, physisorbed water hydrogen-bonded to AlOH2+ groups is observed. The anisotropy measurements demonstrate the existence of an efficient energy-transfer mechanism among the water molecules characterized by a time constant of 400 +/- 100 fs. The persisting anisotropy at long times, especially in the case of AlOH groups and of the structured physisorbed water layer on top of them, proves the anisotropic structuring induced by the surface. The excitation at 3000 cm-1 enables the detection of a photon-induced proton-transfer reaction. The proton back-transfer reaction time constant is 350 +/- 50 fs. From anisotropy measurements, we estimate the proton hopping time to be 900 +/- 100 fs in a locally extended water network lying on the surface.
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Affiliation(s)
- Sophie Le Caër
- Laboratoire Claude Fréjacques, CEA/Saclay, DSM/DRECAM/SCM, URA 331 CNRS, F-91191 Gif-sur-Yvette Cedex, France.
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