-
1دورية أكاديمية
المساهمون: Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
المصدر: EISSN: 2046-2069 ; RSC Advances ; https://universite-paris-saclay.hal.science/hal-04032463Test ; RSC Advances, 2023, 13 (13), pp.8557-8563. ⟨10.1039/d3ra00443k⟩
مصطلحات موضوعية: [CHIM]Chemical Sciences
الوصف: International audience ; This study investigates the mechanism of dioxygen reduction catalyzed by gold nanoparticles using two electron donors, sodium ascorbate and hydroethidine, focusing on the potential ROS formation, such as O 2 ˙ − and H 2 O 2 .
العلاقة: hal-04032463; https://universite-paris-saclay.hal.science/hal-04032463Test; https://universite-paris-saclay.hal.science/hal-04032463/documentTest; https://universite-paris-saclay.hal.science/hal-04032463/file/document.pdfTest
الإتاحة: https://doi.org/10.1039/d3ra00443kTest
https://universite-paris-saclay.hal.science/hal-04032463Test
https://universite-paris-saclay.hal.science/hal-04032463/documentTest
https://universite-paris-saclay.hal.science/hal-04032463/file/document.pdfTest -
2مؤتمر
المؤلفون: Pignié, M.-C, Shcherbakov, Viacheslav, Charpentier, Thibault, Carteret, C, Denisov, Sergey, Mostafavi, Mehran, Thill, A, Le Caër, Sophie
المساهمون: Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Structure et Dynamique par Résonance Magnétique (LCF) (LSDRM), Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
المصدر: 19ème colloque annuel du Groupe Français des Argiles (GFA)
https://cea.hal.science/cea-03664836Test
19ème colloque annuel du Groupe Français des Argiles (GFA), May 2022, Paris, France
https://colloque-gfa.sciencesconf.orgTest/مصطلحات موضوعية: [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
الوصف: International audience
العلاقة: cea-03664836; https://cea.hal.science/cea-03664836Test; https://cea.hal.science/cea-03664836/documentTest; https://cea.hal.science/cea-03664836/file/LeCaer_GFA2022.pdfTest
-
3مؤتمر
المؤلفون: Puget, Marin, Shcherbakov, Viacheslav, Denisov, Sergey, Moreau, P., Dognon, Jean-Pierre, Mostafavi, Mehran, Le Caer, Sophie
المساهمون: Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Structure et Dynamique par Résonance Magnétique (LCF) (LSDRM)
المصدر: EMIRUM 2021 ; https://cea.hal.science/cea-03126694Test ; EMIRUM 2021, Jan 2021, Palaiseau, France ; http://emir.in2p3.fr/userspace/emirum/register/9Test
مصطلحات موضوعية: [CHIM.MATE]Chemical Sciences/Material chemistry
الوصف: International audience ; Numerous additives are used in electrolytes of lithium-ion batteries, especially for the formation of efficient solid electrolyteinterphase at the surface of the electrodes. It is, therefore, necessary to elucidate the degradation processes of these compoundssince it directly affects the lifetime of the battery. These mechanisms can be obtained through radiolysis. In this work, weinvestigated the degradation mechanisms induced by irradiation in fluoroethylene carbonate (FEC), a cyclic carbonate, whichis an additive commonly used in lithium-ion batteries. The first reaction steps were studied by pulse radiolysis. At longtimescales, the radiolytic yields of produced gases (H$_2$, CO, and CO$_2$) were quantified. Pulse radiolysis experimentsevidenced the formation of the FEC$^{●-}$ radical anion, characterized by an absorption band centered ca. 430 nm. The radicalanion is not detected when FEC is solubilized in other solvents: ethanol, diethylcarbonate, etc. This radical is indeed stabilizedin neat FEC, whereas the ring opens to form more stable radical anions when FEC is a solute in other solvents, as confirmedby calculations. A multi-species deconvolution of the spectrum measured in pure FEC revealed a small absorption bandcentered around 560 nm, attributed to the solvated electron, decaying in ca. 100 ps. In neat FEC, excess electrons primarilyundergo attachment compared to solvation. Together with gas chromatography coupled to mass spectrometry measurements,all these observations have allowed us to propose a reaction scheme for both the oxidizing and reducing pathways at stake inirradiated FEC. This work gives clues for the reaction mechanisms undergone by FEC present in electrolytes of lithium-ionbatteries and evidences that the nature of the primary species formed in FEC depends on the amount of FEC in the solution
العلاقة: cea-03126694; https://cea.hal.science/cea-03126694Test; https://cea.hal.science/cea-03126694/documentTest; https://cea.hal.science/cea-03126694/file/LeCaer_Emirum2021.pdfTest
-
4دورية أكاديمية
المؤلفون: Pignie, Marie-Claire, Shcherbakov, Viacheslav, Charpentier, Thibault, Moskura, Mélanie, Carteret, Cedric, Denisov, Sergey, Mostafavi, Mehran, Thill, Antoine, Le Caer, Sophie
المساهمون: Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire (LIONS), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire Structure et Dynamique par Résonance Magnétique (LCF) (LSDRM), Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), DIM RESPORE (GRANITE Project)
المصدر: ISSN: 2040-3364.
مصطلحات موضوعية: [CHIM.MATE]Chemical Sciences/Material chemistry
الوصف: International audience ; 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-CH$_3$ bonds (IMO-CH$_3$), 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-CH$_3$. 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, 2 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.
العلاقة: cea-03125779; https://cea.hal.science/cea-03125779Test; https://cea.hal.science/cea-03125779/documentTest; https://cea.hal.science/cea-03125779/file/Nanoscale_leCaer2021_V0.pdfTest
الإتاحة: https://doi.org/10.1039/D0NR08948FTest
https://cea.hal.science/cea-03125779Test
https://cea.hal.science/cea-03125779/documentTest
https://cea.hal.science/cea-03125779/file/Nanoscale_leCaer2021_V0.pdfTest -
5دورية أكاديمية
المؤلفون: Kaczmarek, Renata, Ward, Samuel, Debnath, Dipra, Jacobs, Taisiya, Stark, Alexander, Korczyński, Dariusz, Kumar, Anil, Sevilla, Michael, Denisov, Sergey, Shcherbakov, Viacheslav, Pernot, Pascal, Mostafavi, Mehran, Dembinski, Roman, Adhikary, Amitava
المساهمون: Department of Bioorganic Chemistry Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences (PAN), Oakland University, Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
المصدر: ISSN: 0947-6539.
مصطلحات موضوعية: Phosphorodithioate, backbone-to-base hole transfer, base-to-backbone hole transfer, guanine cation radical, thiyl radicals, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
الوصف: International audience ; Directionality of the hole transfer processes between DNA-backbone and -base was investigated using phosphorodithioate [P(S−)=S] components. ESR spectroscopy in homogeneous frozen aqueous solutions, pulse radiolysis in aqueous solution at ambient temperature confirmed initialformation of G•+-P(S−)=S. The ionization potential of G-P(S−)=S was calculated to be slightly lower than that of guanine in 5’-dGMP. Subsequent thermally-activated hole transfer from G•+ to P(S−)=S led to dithiyl radical (P-2S•) formation on μs timescale. In parallel, ESR spectroscopy andpulse radiolysis, and density functional theory (DFT) calculations confirmed P-2S• formation in abasic phosphorodithioate model compound. ESR investigations at low temperatures and higher G-P(S−)=S concentrations showed a bimolecular conversion of P-2S• to the σ2-σ*1-bonded dimeranion radical [-P-2S∸2S-P-]− [ΔG (150 K, DFT) = −7.2 kcal/mol]. However, [-P-2S∸2S-P-]−formation was not observed by pulse radiolysis [ΔG° (298 K, DFT) = −1.4 kcal/mol]. Neither P-2S• nor [-P-2S∸2S-P-]− oxidized guanine base; base-to-backbone hole transfer occurs in phosphorodithioate.
العلاقة: hal-02563589; https://hal.science/hal-02563589Test; https://hal.science/hal-02563589/documentTest; https://hal.science/hal-02563589/file/Kaczmarek2021.pdfTest
الإتاحة: https://doi.org/10.1002/chem.202000247Test
https://hal.science/hal-02563589Test
https://hal.science/hal-02563589/documentTest
https://hal.science/hal-02563589/file/Kaczmarek2021.pdfTest -
6دورية أكاديمية
المؤلفون: Kaczmarek, Renata, Ward, Samuel, Debnath, Dipra, Jacobs, Taisiya, Stark, Alexander D., Korczyński, Dariusz, Kumar, Anil, Sevilla, Michael D., Denisov, Sergey A., Shcherbakov, Viacheslav, Pernot, Pascal, Mostafavi, Mehran, Dembinski, Roman, Adhikary, Amitava
المصدر: Chemistry – A European Journal ; volume 26, issue 43, page 9403-9403 ; ISSN 0947-6539 1521-3765
-
7دورية أكاديمية
المصدر: RSC Advances; 2023, Vol. 13 Issue 13, p8557-8563, 7p
-
8دورية أكاديمية
المؤلفون: Denisov, Sergey, Ward, Samuel, Shcherbakov, Viacheslav, Stark, Alexander D., Kaczmarek, Renata, Radzikowska-Cieciura, Ewa, Debnath, Dipra, Jacobs, Taisiya, Kumar, Anil, Sevilla, Michael D., Pernot, Pascal, Dembinski, Roman, Mostafavi, Mehran, Adhikary, Amitava
المساهمون: Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Oakland University, Department of Bioorganic Chemistry Centre of Molecular and Macromolecular Studies Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences = Académie polonaise des sciences (PAN)
المصدر: ISSN: 1520-6106.
مصطلحات موضوعية: [CHIM]Chemical Sciences
الوصف: International audience
العلاقة: hal-04057253; https://hal.science/hal-04057253Test; PUBMEDCENTRAL: PMC8776618
-
9رسالة جامعية
المؤلفون: Shcherbakov, Viacheslav
المساهمون: Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, Mehran Mostafavi
المصدر: https://theses.hal.science/tel-03793338Test ; Catalysis. Université Paris-Saclay, 2022. English. ⟨NNT : 2022UPASF032⟩.
مصطلحات موضوعية: Radiosensitization, Gold nanoparticles, Radical, Catalysis, Radiosensibilisation, Nanoparticules d'or, Catalyse, [CHIM.CATA]Chemical Sciences/Catalysis
الوصف: Gold nanoparticles (AuNPs) are a promising class of radiosensitizers, agents that increase radiotherapy efficacy. In 2004, it was demonstrated that (AuNPs) accelerated tumour size reduction in mice after radio treatment. The use of gold was motivated by the so-called dose enhancement effect. Since gold has a high atomic number (Z=79), it absorbs more energy at the keV range than water or soft-tissue, increasing the overall ionization of irradiated volume due to the emission of secondary electrons and photons. Later, in vivo and in vitro experiments showed that the dose enhancement effect could not explain the observed radiosensitization. Nowadays, the proposed mechanism of nanoparticle-induced radiosensitization includes different physical, chemical, and biological effects. However, there is no consensus on the exact mechanism. The chemical effects are usually associated with the increased formation of reactive oxygen species (ROS), such as hydroxyl radicals (•OH), superoxide radicals (O₂•⁻), and hydrogen peroxide (H₂O₂), in the presence of nanoparticles. The primary method to detect ROS in biological studies is the use of fluorescent dyes. It is based on the oxidation of a non-fluorescent molecule to a fluorescent one in the reaction with ROS, assuming that increase in fluorescent intensity is proportional to the increase in ROS concentration. However, a dye oxidation process is a multistep process that includes the formation of a variety of products (not only the fluorescent one). AuNPs possess catalytic activity, which can change reaction pathways. In the current work, we examined the idea of increased ROS production in the presence of AuNPs with and without the use of ionizing radiation. First, we studied the effect of AuNPs on water radiolysis by directly measuring solvated electron yields evolution in time using the picosecond pulse radiolysis technique. There was no increase in primary water radicals production in the presence of AuNPs of different sizes and at a concentration up to 3 mM of gold (600 µM/m ...
العلاقة: NNT: 2022UPASF032; tel-03793338; https://theses.hal.science/tel-03793338Test; https://theses.hal.science/tel-03793338/documentTest; https://theses.hal.science/tel-03793338/file/101885_SHCHERBAKOV_2022_archivage.pdfTest
-
10دورية أكاديمية
المؤلفون: Shcherbakov, Viacheslav, Denisov, Sergey, Mostafavi, Mehran
المساهمون: Institut de Chimie Physique (ICP), Institut de Chimie - CNRS Chimie (INC-CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
المصدر: ISSN: 2079-4991.
مصطلحات موضوعية: [CHIM.CATA]Chemical Sciences/Catalysis, [CHIM]Chemical Sciences
الوصف: International audience ; The ability of gold nanoparticles (AuNPs) to catalyze reactions involving radicals is poorly studied. However, AuNPs are used in applications where chemical reactions involving transient radicals occur. Herein, we investigate AuNPs’ catalytic effect on 2-propanol oxidation and acetanilide hydroxylation in aqueous solutions under ionizing radiation at room temperature. In both cases, the presence of AuNPs led to selective oxidation of organic radicals, significantly changing the products’ composition and ratio. Based on these observations, we stress how AuNPs’ catalytic activity can affect the correctness of reactive oxygen species concentration determination utilizing organic dyes. We also provide a discussion on the role of AuNPs’ catalytic activity in the radiosensitization effect actively studied for radiotherapy.
العلاقة: hal-03322574; https://hal.science/hal-03322574Test; PUBMEDCENTRAL: PMC7998999
النص الكامل