Article
Engineering, Environmental
Juliana Mendonca Silva de Jesus, Flavio Kiyoshi Tominaga, Allan dos Santos Argolo, Ana Cristina Gomes Nascimento, Sueli Ivone Borrely, Daniel Perez Vieira, Daniele Maia Bila, Antonio Carlos Silva Costa Teixeira
Summary: This study investigates the feasibility of using ionizing sources to degrade progestins hormones in synthetic solutions and real pharmaceutical wastewater. The results show that LNG is more difficult to degrade compared to GES, and LNG exhibits greater reactivity with reducing species. Furthermore, the irradiation process reduces the toxicity of the substances to biological organisms.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Chemistry, Physical
Stavroula Isidora Giannakandropoulou, Hortense Desjonqueres, Charles Wittebroodt, Gerard Baldacchino
Summary: This article investigates the anoxic corrosion process of a carbon steel/ultrapure deaerated water system under gamma radiation and examines the generation of molecular hydrogen gas. The study adopts an experimental setup to estimate the corrosion rate during pre-irradiation, irradiation, and post-irradiation phases. Post mortem analyses reveal chemical changes in solution and the formation of a thin corrosion layer composed of magnetite. The results suggest that gamma radiation slightly reduces the carbon steel corrosion rate and inhibits the formation of a thick protective layer, potentially leading to a reduced component lifetime.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Chemistry, Physical
Thibaut Herin, Thibault Charpentier, Pascal Bouniol, Sophie Le Caer
Summary: Under radiation, cementitious materials undergo radiolysis and produce dihydrogen gas. This study focuses on the radiolytic behavior of portlandite, a main hydration product of cement. It is found that a portion of the dihydrogen gas remains trapped in the crystal lattice and can be released after heating. The results are important for a better understanding of materials used in the nuclear industry.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Jacy K. Conrad, Aliaksandra Lisouskaya, Logan Barr, Craig R. Stuart, David M. Bartels
Summary: Pulsed electron radiolysis was used to investigate the chemical reaction kinetics and Arrhenius parameters of iron(II) reactions in aqueous solutions. The second-order reactions between Fe2+ and the hydrated electron (e(aq) (-)) as well as the perhydroxyl radical (HO2 (& BULL;)), generated from water radiolysis, were studied up to high temperatures using custom-built flow-through cells with a multichannel optical detection system. It was discovered that the reaction with the HO2 (& BULL;) radical proceeded via the formation of a metal-ion adduct species, Fe2+-HO2 (& BULL;). The molar extinction coefficient and first-order decay rate coefficients of the adduct were also determined.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Astronomy & Astrophysics
M. J. Starkey, S. A. Fuselier, M. I. Desai, S. J. Schwartz, C. T. Russell, H. Wei, H. Madanian, J. Mukherjee, L. B. Wilson
Summary: The study focused on the acceleration of He+ pickup ions downstream of quasiperpendicular shocks in relation to the fast-mode Mach number and shock obliquity. Positive correlation was found between the spectral index ratio and M-f, indicating enhanced perpendicular energization of He+ PUIs as the shock strength increases.
ASTROPHYSICAL JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Changjiang Hu, Liwei Cheng, Liheng Zhou, Zhiwen Jiang, Pingping Gan, Shuiyan Cao, Qiuhao Li, Chong Chen, Yunlong Wang, Mehran Mostafavi, Shuao Wang, Jun Ma
Summary: In this study, Zr/Hf-based nanoscale UiO-66 metal-organic frameworks were used as highly effective and stable radiation sensitizers for water splitting under gamma-ray irradiation. The unique structure of these frameworks allows for increased scattering between secondary electrons and water, resulting in enhanced H2 production. The use of a small quantity of UiO-66-Hf-OH achieves a gamma-rays-to-hydrogen conversion efficiency exceeding 10%, surpassing existing methods. This work demonstrates the feasibility and advantages of MOF-assisted radiolytic water splitting and offers a competitive method for creating a green H2 economy.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Optics
A. Dochain, V. M. Andrianarijaona, X. Urbain
Summary: In this study, the branching ratios and the preference for higher excited states in mutual neutralization reactions between He+ and H-/D- ions at low collision energies have been investigated through measurements and model analysis.
Article
Astronomy & Astrophysics
Zhe Chang, Xukun Zhang, Jing-Zhi Zhou
Summary: The LHAASO Collaboration has observed ultrahigh-energy photons from gamma-ray Galactic sources and investigated the possibility of nearby pulsars as the sources. They found that protons could be accelerated to PeV near the pulsars and the suggested origin pulsars' gamma-ray spectra match well with the observed gamma-ray spectra.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ekrem Oguzhan Anguner, Gerrit Spengler, Elena Amato, Sabrina Casanova
Summary: The Pevatron test statistic (PTS) is used to analyze data from gamma-ray observatories and confirm the previous results for RX J1713.7-3946, Vela Jr, and HESS J1745-290. High angular resolution observations are necessary to resolve source confusion in Pevatron searches. No statistically significant conclusion with respect to Pevatron associations could be drawn for the diffuse gamma-ray emission around the Galactic Centre and several unidentified gamma-ray sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Jacy K. Conrad, Aliaksandra Lisouskaya, Stephen P. Mezyk, David M. Bartels
Summary: The reactivity of chromium(III) species with the major oxidizing and reducing radiolysis products of water was investigated, and it was found that the reaction between hydrated electron and Cr(III) species showed positive temperature dependence. The reaction between acidic Cr(III) species and hydroxyl radical was also studied, showing a rate coefficient at 25 degrees C. These findings are important for developing improved models of aqueous chromium speciation for the remediation of liquid high-level nuclear waste.
Article
Physics, Nuclear
Zhe Chang, Yu-Ting Kuang, Xukun Zhang, Jing-Zhi Zhou
Summary: Recently, LHAASO has detected ultrahigh-energy photons up to 1.4 PeV from 12 gamma-ray Galactic sources. In this paper, the possibility of leptonic origin of the gamma-ray is investigated. The Hertzian dipole model is used to describe the pulsars around the sources, where electrons can be accelerated to PeV by the electromagnetic fields of pulsars. The energy distribution of electrons and the leptonic gamma-ray spectra can be calculated using the assumption of uniformly distributed initial electrons in a spherical shell around the pulsar.
Article
Astronomy & Astrophysics
V. A. Acciari, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, D. Baack, A. Babic, B. Banerjee, U. Barres de Almeida, J. A. Barrio, J. Becerra Gonzalez, W. Bednarek, L. Bellizzi, E. Bernardini, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, G. Busetto, R. Carosi, G. Ceribella, M. Cerruti, Y. Chai, A. Chilingarian, S. Cikota, S. M. Colak, U. Colin, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, V D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, V. Fallah Ramazani, A. Fattorini, G. Ferrara, L. Foffano, M. Fonseca, L. Font, C. Fruck, S. Fukami, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, D. Green, D. Hadasch, A. Hahn, J. Herrera, J. Hoang, D. Hrupec, M. Huetten, T. Inada, S. Inoue, K. Ishio, Y. Iwamura, L. Jouvin, Y. Kajiwara, M. Karjalainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, S. Lombardi, F. Longo, M. Lopez, R. Lopez-Coto, A. Lopez-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, S. Masuda, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martinez, D. Mazin, S. Mender, S. Micanovic, D. Miceli, T. Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, D. Morcuende, V Moreno, E. Moretti, P. Munar-Adrover, V Neustroev, C. Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, L. Nogues, S. Nozaki, Y. Ohtani, T. Oka, J. Otero-Santos, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, P. Penil, M. Peresano, M. Persic, P. G. Prada Moroni, E. Prandini, I Puljak, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, B. Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I Snidaric, D. Sobczynska, A. Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Suric, M. Takahashi, F. Tavecchio, P. Temnikov, T. Terzic, M. Teshima, N. Torres-Alba, L. Tosti, J. van Scherpenberg, G. Vanzo, M. Vazquez Acosta, S. Ventura, V. Verguilov, C. F. Vigorito, V. Vitale, I Vovk, M. Will, D. Zaric, S. Celli, G. Morlino
Summary: This study investigates the gamma-ray emission in the vicinity of the gamma Cygni supernova remnant (SNR) and identifies three emission regions associated with the SNR. The researchers find that the maximum energy of cosmic rays (CRs) and the level of turbulence in the shock depend on the SNR's lifetime. These findings have important implications for understanding the mechanism of CR acceleration in SNRs.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
H. Abe, S. Abe, V. A. Acciari, I. Agudo, T. Aniello, S. Ansoldi, L. A. Antonelli, A. Arbet Engels, C. Arcaro, M. Artero, K. Asano, D. Baack, A. Babic, A. Baquero, U. Barres de Almeida, J. A. Barrio, I. Batkovic, J. Baxter, J. Becerra Gonzalez, W. Bednarek, E. Bernardini, M. Bernardos, A. Berti, J. Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Z. Bosnjak, I. Burelli, G. Busetto, R. Carosi, M. Carretero-Castrillo, A. J. Castro-Tirado, G. Ceribella, Y. Chai, A. Chilingarian, S. Cikota, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, G. D'Amico, V. D'Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, A. Del Popolo, M. Delfino, J. Delgado, C. Delgado Mendez, D. Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espineira, D. Dominis Prester, A. Donini, D. Dorner, M. Doro, D. Elsaesser, G. Emery, J. Escudero, V. Fallah Ramazani, L. Farina, A. Fattorini, L. Font, C. Fruck, S. Fukami, Y. Fukazawa, R. J. Garcia Lopez, M. Garczarczyk, S. Gasparyan, M. Gaug, J. G. Giesbrecht Paiva, N. Giglietto, F. Giordano, P. Gliwny, N. Godinovic, R. Grau, D. Green, J. G. Green, D. Hadasch, A. Hahn, T. Hassan, L. Heckmann, J. Herrera, D. Hrupec, M. Huetten, R. Imazawa, T. Inada, R. Iotov, K. Ishio, I. Jimenez Martinez, J. Jormanainen, D. Kerszberg, Y. Kobayashi, H. Kubo, J. Kushida, A. Lamastra, D. Lelas, F. Leone, E. Lindfors, L. Linhoff, S. Lombardi, F. Longo, R. Lopez-Coto, M. Lopez-Moya, A. Lopez-Oramas, S. Loporchio, A. Lorini, E. Lyard, B. Machado de Oliveira Fraga, P. Majumdar, M. Makariev, G. Maneva, N. Mang, M. Manganaro, S. Mangano, K. Mannheim, M. Mariotti, M. Martinez, A. Mas Aguilar, D. Mazin, S. Menchiari, S. Mender, S. Micanovic, D. Miceli, T. Miener, J. M. Miranda, R. Mirzoyan, E. Molina, H. A. Mondal, A. Moralejo, D. Morcuende, V. Moreno, T. Nakamori, C. Nanci, L. Nava, V. Neustroev, M. Nievas Rosillo, C. Nigro, K. Nilsson, K. Nishijima, T. Njoh Ekoume, K. Noda, S. Nozaki, Y. Ohtani, T. Oka, A. Okumura, J. Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, L. Pavletic, M. Persic, M. Pihet, G. Pirola, F. Podobnik, P. G. Prada Moroni, E. Prandini, G. Principe, C. Priyadarshi, W. Rhode, M. Ribo, J. Rico, C. Righi, A. Rugliancich, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, F. G. Saturni, B. Schleicher, K. Schmidt, F. Schmuckermaier, J. L. Schubert, T. Schweizer, J. Sitarek, V. Sliusar, D. Sobczynska, A. Spolon, A. Stamerra, J. Striskovic, D. Strom, M. Strzys, Y. Suda, T. Suric, H. Tajima, M. Takahashi, R. Takeishi, F. Tavecchio, P. Temnikov, K. Terauchi, T. Terzic, M. Teshima, L. Tosti, S. Truzzi, A. Tutone, S. Ubach, J. van Scherpenberg, M. Vazquez Acosta, S. Ventura, V. Verguilov, I Viale, C. F. Vigorito, V. Vitale, I. Vovk, R. Walter, M. Will, C. Wunderlich, T. Yamamoto, D. Zaric
Summary: By observing the SNR G106.3+2.7 with the MAGIC telescopes, we detected extended gamma-ray emission that is spatially coincident with the radio continuum morphology. The multi-wavelength spectrum of the emission from the tail region suggests proton acceleration up to similar to PeV, while the emission mechanism of the head region could either be hadronic or leptonic. The high-energy emission in this middle-aged supernova remnant can be explained by considering a scenario where protons escaping from the SNR in the past interact with surrounding dense gases at present.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Enrico Peretti, Alessandra Lamastra, Francesco Gabriele Saturni, Markus Ahlers, Pasquale Blasi, Giovanni Morlino, Pierre Cristofari
Summary: Active galactic nuclei can produce powerful winds known as ultra-fast outflows (UFOs), which may accelerate ultra-high energy cosmic rays and high-energy neutrinos. Our study suggests that obscured UFOs, such as those observed in NGC1068, could play a significant role in the observed gamma-ray flux while contributing less to the associated neutrino flux.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Enrico Peretti, Giovanni Morlino, Pasquale Blasi, Pierre Cristofari
Summary: The intense star-forming activity in starburst galaxies leads to strong galactic winds and potential particle acceleration at the termination shock. The accelerated cosmic rays escape into extragalactic space, producing gamma-rays and neutrinos. The diffuse flux of cosmic rays from starburst bubbles is compared with existing data to study their impact on cosmological scales.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Sarah Al Gharib, Abdel Karim El Omar, Adnan Naja, Ariane Deniset-Besseau, Sergey A. Denisov, Pascal Pernot, Mehran Mostafavi, Jacqueline Belloni
Summary: The study investigates the nucleation and growth of crystallites in highly supersaturated solutions of potassium nitrate induced by a single laser nanosecond pulse. It is found that the turbidity increases proportionally with time during the early growth stage, with an accretion rate constant of 4.7 x 10(7) L mol(-1) s(-1).
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Physical
Teseer Bahry, Sergey A. Denisov, Philippe Moisy, Jun Ma, Mehran Mostafavi
Summary: Researchers observed the solvation dynamics of electrons in water and n-tributyl phosphate solutions, finding that water molecules significantly influence the solvation process of electrons, providing insights into the reaction mechanisms during actinide extraction.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Geochemistry & Geophysics
Johan Vandenborre, Laurent Truche, Amaury Costagliola, Emeline Craff, Guillaume Blain, Veronique Baty, Ferid Haddad, Massoud Fattahi
Summary: The study investigates the production/degradation of low molecular weight carboxylate anions through irradiation experiments on carbonate solutions. It is found that radiolysis of carbonate can generate carboxylate species, chiefly oxalate, which may support subsurface microbial ecosystems. The research highlights the potential significance of carbonate radiolysis in providing energy sources for microbial life.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Brandon Perrin, Laurent Venault, Emilie Broussard, Johan Vandenborre, Guillaume Blain, Massoud Fattahi, Sergey Nikitenko
Summary: The study of radiolytic products formation is crucial in the reprocessing of spent nuclear fuel and the storage of radioactive aqueous solutions. Experimental investigations have shown that the yields of radiolytic products depend on the nitric acid concentration and the oxidation state of plutonium. Molecular hydrogen production decreases with increasing nitric acid concentration, while nitrous acid and nitrous oxide productions increase. This study provides insight into the role played by plutonium redox behavior in the formation of radiolytic products.
Article
Biology
Guillaume Blain, Johan Vandenborre, Daphnee Villoing, Vincent Fiegel, Giovanna Rosa Fois, Ferid Haddad, Charbel Koumeir, Lydia Maigne, Vincent Metivier, Freddy Poirier, Vincent Potiron, Stephane Supiot, Noel Servagent, Gregory Delpon, Sophie Chiavassa
Summary: During ultra-high dose rate external radiation therapy, the production of hydrogen peroxide (H2O2) can be controlled by early heterogenous radiolysis processes, thus sparing healthy tissues while maintaining tumor control. This study provides experimental evidence for this phenomenon during UHDR proton-beam irradiations.
RADIATION RESEARCH
(2022)
Article
Chemistry, Physical
Mohammad Ghalei, Parastoo Mahdi Khoshouei, Johan Vandenborre, Francois Guerard, Guillaume Blain, Mojtaba Zarei, Ferid Haddad, Massoud Fattahi
Summary: This study investigates the impact of chloroform radiolysis on astatine (At) chemistry, particularly in the production of At-211 radiopharmaceuticals. Two experiments were conducted to measure pH values and predict the acidic conditions for At-211 production. The findings provide insights into the impurity generation mechanism caused by At radiolysis in chloroform, enabling the identification of solutions to counteract these unwanted effects.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Amel Zorai, Abdelhafid Souici, Diana Dragoe, Eric Riviere, Salim Ouhenia, Jacqueline Belloni, Mehran Mostafavi
Summary: The radiolytic method was used to synthesize ultrasmall cobalt ferrite nanoparticles with superparamagnetic properties. The properties of these nanoparticles were studied at increasing doses of irradiation. The analysis confirmed the formation of ultra-small cobalt ferrite nanoparticles (6-9 nm) in the cubic spinel structure, and their superparamagnetic properties were revealed through temperature-dependent magnetic measurements.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Engineering, Environmental
Zhiwen Jiang, Daniel Adjei, Sergey A. Denisov, Mehran Mostafavi, Jun Ma
Summary: This study used pulse radiolysis to investigate the reaction between the short-lived hydrated electron (eaq-) and short-chain PFAS, and discovered that radiolytic carbon dioxide radicals can selectively defluorinate PFBS, suggesting ionizing radiation as a versatile treatment technique.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Haohan Zhang, Tomo Suzuki-Muresan, Stephane Gin, Guillaume Blain, Thierry Sauvage, Olivier Wendling, Johan Vandenborre, Abdesselam Abdelouas
Summary: During the long-term disposal of high-level nuclear waste glass, it may be exposed to a vapor environment before contacting groundwater. The glass also experiences damage from self-irradiation. This study investigates the chemical durability of glass after hydration and irradiation, with a focus on the impact of ionizing effect. Results show that irradiation does not significantly modify chemical durability, but pre-hydrated glass exhibits an increase in the initial release of Si, possibly due to the dissolution of secondary phases. The total dissolution of the hydrated layer is observed, requiring further investigation into the release of radionuclides.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Daniel Adjei, Yahaira Reyes, Anil Kumar, Samuel Ward, Sergey A. Denisov, Moaadh Alahmadi, Michael D. Sevilla, Stanislaw F. Wnuk, Mehran Mostafavi, Amitava Adhikary
Summary: 5-AmdU has been used for DNA metabolic labeling and fluorescent imaging of live cells. It also shows significant radiosensitization in breast cancer cells through the formation of site-specific nitrogen-centered radicals. The study reveals that these radicals are not formed through the reduction of the azido group in 6-AmU. The formation of different nitrogen-centered radicals is controlled by thermodynamics and protonation from the surrounding water.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Multidisciplinary
Changjiang Hu, Liwei Cheng, Liheng Zhou, Zhiwen Jiang, Pingping Gan, Shuiyan Cao, Qiuhao Li, Chong Chen, Yunlong Wang, Mehran Mostafavi, Shuao Wang, Jun Ma
Summary: In this study, Zr/Hf-based nanoscale UiO-66 metal-organic frameworks were used as highly effective and stable radiation sensitizers for water splitting under gamma-ray irradiation. The unique structure of these frameworks allows for increased scattering between secondary electrons and water, resulting in enhanced H2 production. The use of a small quantity of UiO-66-Hf-OH achieves a gamma-rays-to-hydrogen conversion efficiency exceeding 10%, surpassing existing methods. This work demonstrates the feasibility and advantages of MOF-assisted radiolytic water splitting and offers a competitive method for creating a green H2 economy.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Sarah Al Gharib, Pierre Archirel, Daniel Adjei, Jacqueline Belloni, Mehran Mostafavi
Summary: The oxidation mechanism of crocin, a major compound of saffron, by the free OH· radical was investigated using various techniques. The absorption spectra and reaction rate constants of the transient species were determined. The antioxidant properties of crocin were highlighted based on experimental and theoretical investigations.
Article
Chemistry, Physical
Qingde Chen, Sergey A. Denisov, Denis Dobrovolskii, Mehran Mostafavi
Summary: The decay kinetics of hydrated electrons in AOT-based ternary microemulsions were studied using picosecond pulse radiolysis and UV-vis spectroscopy. Two types of reactions, recombination at the water-oil interface and radical-radical reactions in the water pools, were observed. The size of water pools and the water-oil interface played important roles in the kinetics of the reactions.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Denis S. Dobrovolskii, Mehran Mostafavi, Sergey A. Denisov
Summary: The reactivity of electrons in the CO2-water system was studied using picosecond electron pulse radiolysis and UV-vis transient spectroscopy at different gas pressures and temperatures. The results showed a non-monotonic dependence of electron reactivity with CO2 concentration, which correlated with the changing molar concentration of CO2 in water under varying pressure.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Viacheslav Shcherbakov, Sergey A. Denisov, Mehran Mostafavi
Summary: In this study, the mechanism of dioxygen reduction catalysed by gold nanoparticles (AuNPs) using sodium ascorbate and hydroethidine as electron donors was investigated. The formation of ROS, such as O-2(-) and H2O2, was examined. The results showed that ROS are only formed as intermediates on the surface of nanoparticles and are catalytically reduced to water by AuNPs. This challenges the claim of ROS production in the presence of AuNPs often reported in literature. Additionally, AuNPs were found to catalyze the oxidation of electron donors in cells, leading to oxidative stress.