Quasi-Free Electron-Mediated Radiation Sensitizaion by C5-Halopyrimidines
by Jun Ma, Teseer Bahry, Sergey A. Denisov, Amitava Adhikary, Mehran Mostafavi J. Phys. Chem. A 2021, 125, 36, 7967–7975; doi.org/10.1021/acs.jpca.1c05974 Substitution of the thymidine moiety in DNA by C5-substituted halogenated thymidine analogues causes significant augmentation of radiation damage in living cells. However, the molecular pathway involved in such radiosensitization process has not been clearly elucidated…
Reaction Mechanisms of Fluoroethylene Carbonate Degradation, an Additive of Lithium-Ion Batteries, Unraveled by Radiation Chemistry
by Marin Puget, Viacheslav Shcherbakov, Sergey A. Denisov, Philippe Moreau, Jean-Pierre Dognon, Mehran Mostafavi and Sophie LE CAER Chemistry – A European Journal 2021; doi.org/10.1002/chem.202100562 Numerous additives are used in electrolytes of lithium‐ion batteries, especially for the formation of efficient solid electrolyte interphase at the surface of the electrodes. The understanding of the degradation processes…
Selective Oxidation of Transient Organic Radicals in the Presence of Gold Nanoparticles
by Viacheslav Shcherbakov, Sergey A. Denisov and Mehran Mostafavi Nanomaterials 2021, 11, 727; doi.org/10.3390/nano11030727 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…
Real-Time Observation of Solvation Dynamics of Electron in Actinide Extraction Binary Solutions of Water and n-Tributyl Phosphate
by Teseer Bahry, Sergey A. Denisov, Philippe Moisy, Jun Ma, Mehran Mostafavi J. Phys. Chem. B 2021, 125, 15, 3843–3849; doi.org/10.1021/acs.jpcb.0c10831 The excess electron in solution is a highly reactive radical involved in various radiation-induced reactions. Its solvation state critically determines the subsequent pathway and rate of transfer. For instance, water plays a dominating role in…
Solvation of excess electron in water
by Sergey A. DENISOV The smallest possible anion is a solvated electronBut how does it form? Herein the main focus of solvate electron formation will be on the water case. We must differentiate thus hydrated and solvated electron. One can easily understand that hydrated electron is about water, and the solvated electron is a general…
Presolvated electron reactivity towards CO2, N2O in the water
by Sergey A. Denisov and M. Mostafavi Phys. Chem. Chem. Phys., 2021, Accepted; doi.org/10.1039/D1CP00373A The reactivity of presolvated electrons with CO2 and N2O was studied in the gas pressure range from 1 to 52 bar. To measure this reactivity, the home-made spectroscopic cell with liquid circulation was developed working up to 70bar of gas pressure. The efficiency of…
How to conduct pulse radiolysis of a liquid-gas system under pressure
by DENISOV Sergey Goal In order to conduct pulse radiolysis experiments at high gas pressures, we designed the optical cell capable of withstanding pressures up to 70bar with a 1 mm entrance window. The need for high pressures of gases was determined by the need for a high concentration of gases in water solutions for…
Confined Water Radiolysis in Aluminosilicate Nanotubes: The Importance of Charge Separation Effects
by Marie-Claire PIGNIE, Viacheslav Shcherbakov, Thibault Charpentier, Mélanie Moskura, Cedric Carteret, Sergey A. Denisov, M. Mostafavi, Antoine Thill and Sophie LE CAER Nanoscale 2021, 13, 3092-3105; https://doi.org/10.1039/D0NR08948F 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…
Oxidation of Silver Cyanide Ag(CN)2– by the OH Radical: From Ab Initio Calculation to Molecular Simulation and to Experiment
by Céline Léonard, Frédéric Le Quéré, Daniel Adjei, Sergey A. Denisov, Mehran Mostafavi and Pierre Archirel We investigate the oxidation of silver cyanide in water by the OH radical in order to compare this complex with the free cation Ag+ and to measure the influence of the ligands. High-level ab initio calculations of the model species enable the calibration of…
On the Primary Water Radicals’ Production in the Presence of Gold Nanoparticles: Electron Pulse Radiolysis Study
by Viacheslav Shcherbakov, Sergey A. Denisov and Mehran Mostafavi Nanomaterials 2020, 10, 2478; https://doi.org/10.3390/nano10122478 Gold nanoparticles are known to cause a radiosensitizing effect, which is a promising way to improve radiation therapy. However, the radiosensitization mechanism is not yet fully understood. It is currently assumed that gold nanoparticles can influence various physical, chemical, and biological processes. Pulse radiolysis is…
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