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295 results on '"Pimblott, Simon"'

18. Effects of relative humidity, surface area and production route on hydrogen yields from water on the surface of plutonium dioxide

Author

Webb, Kevin, primary, Gregson, Colin, additional, Holt, Josh, additional, McLuckie, Bliss, additional, Orr, Robin, additional, Sims, Howard, additional, Woodhead, David, additional, Hobbs, Jeff, additional, Steele, Helen, additional, Currell, Fred, additional, Jones, Luke, additional, Pimblott, Simon, additional, and Taylor, Robin, additional

Published
2023
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19. Cover Feature: Gamma Radiation‐Induced Degradation of Acetohydroxamic Acid (AHA) in Aqueous Nitrate and Nitric Acid Solutions Evaluated by Multiscale Modelling (ChemPhysChem 5/2023)

Author

Conrad, Jacy K., primary, Mezyk, Stephen P., additional, Isherwood, Liam H., additional, Baidak, Aliaksandr, additional, Pilgrim, Corey D., additional, Whittaker, Daniel, additional, Orr, Robin M., additional, Pimblott, Simon M., additional, and Horne, Gregory P., additional

Published
2023
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25. Resurgence of a Nation’s Radiation Science Driven by Its Nuclear Industry Needs

Author

Leay, Laura, primary, Baidak, Aliaksandr, additional, Anderson, Christopher, additional, Chan, Choen May, additional, Daubney, Aaron, additional, Donoclift, Thomas, additional, Draper, Gemma, additional, Edge, Ruth, additional, Hobbs, Jeff, additional, Jones, Luke, additional, Mason, Nicholas J. S., additional, Messer, Darryl, additional, O’Leary, Mel, additional, Orr, Robin, additional, Pimblott, Simon M., additional, de Moraes Shubeita, Samir, additional, Smith, Andrew D., additional, Steele, Helen, additional, Wady, Paul, additional, and Currell, Frederick, additional

Published
2021
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30. Radiation-induced reaction kinetics of Zn2+ with eS− and Cl2˙− in Molten LiCl–KCl eutectic at 400–600 °C.

Author

Iwamatsu, Kazuhiro, Horne, Gregory P., Gakhar, Ruchi, Halstenberg, Phillip, Layne, Bobby, Pimblott, Simon M., and Wishart, James F.

Abstract

Molten chloride salts are currently under consideration as combined coolant and liquid fuel for next-generation molten salt nuclear reactors. Unlike complementary light-water reactor technologies, the radiation science underpinning molten salts is in its infancy, and thus requires a fundamental mechanistic investigation to elucidate the radiation-driven chemistry within molten salt reactors. Here we present an electron pulse radiolysis kinetics study into the behaviour of the primary radiolytic species generated in molten chloride systems, i.e., the solvated electron (eS−) and di-chlorine radical anion (Cl2˙−). We examine the reaction of eS− with Zn2+ from 400–600 °C (Ea = 30.31 ± 0.09 kJ mol−1), and the kinetics and decay mechanisms of Cl2˙− in molten lithium chloride-potassium chloride (LiCl–KCl) eutectic. In the absence of Zn2+, the lifetime of eS− was found to be dictated by residual impurities in ostensibly "pure" salts, and thus the observed decay is dependent on sample history rather than being an intrinsic property of the salt. The decay of Cl2˙− is complex, owing to the competition of Cl2˙− disproportionation with several other chemical pathways, one of which involves reduction by radiolytically-produced Zn+ species. Overall, the reported findings demonstrate the richness and complexity of chemistry involving the interactions of ionizing radiation with molten salts. [ABSTRACT FROM AUTHOR]

Published
2022
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33. Correction to “Radiation-Assisted Formation of Metal Nanoparticles in Molten Salts”

Author

Dias, Elaine T., primary, Gill, Simerjeet K., additional, Liu, Yang, additional, Halstenberg, Phillip, additional, Dai, Sheng, additional, Huang, Jiahao, additional, Mausz, Julia, additional, Gakhar, Ruchi, additional, Phillips, William C., additional, Mahurin, Shannon, additional, Pimblott, Simon M., additional, Wishart, James F., additional, and Frenkel, Anatoly I., additional

Published
2021
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35. Radiolysis of aqueous solutions of 1,1- and 1,2-dichloroethane

Author

Pimblott, Simon M., Milosavljevic, Bratoljub H., and LaVerne, Jay A.

Subjects
Radiolysis -- Methods, Aqueous solution reactions -- Analysis, Ethylene dichloride -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The yields of chloride ion and molecular hydrogen were determined in the gamma, the fast electron, and the 5 MeV helium ion radiolysis of deaerated and aerated aqueous solutions of 1,1- and 1,2-dichloroethane. In deaerated solutions irradiated with gamma-rays or fast electrons, the yield of chloride ion increases while the yield of molecular hydrogen decreases with increasing dichloroethane concentration.

Published
2005

36. Hydrated electron yields in the heavy ion radiolysis of water

Author

LaVerne, Jay A., Stefanic, Igor, and Pimblott, Simon M.

Subjects
Radiolysis -- Methods, Water -- Chemical properties, Simulated annealing (Mathematics) -- Analysis, Chemicals, plastics and rubber industries
Abstract

The yields of hydrated electrons in the radiolysis of water with protons, helium ions, and carbon ions are examined using experimental measurements with Monte Carlo track simulations. The model results show that the initial hydrated electron yields, and possibly other water decomposition products, are dependent on the type and energy of the incident radiation.

Published
2005

37. Rate coefficient measurements of hydrated electrons and hydroxyl radicals with chlorinated ethanes in aqueous solutions

Author

Milosavljevic, Bratoljub H., LaVerne, Jay A., and Pimblott, Simon M.

Subjects
Ethanes -- Chemical properties, Ethanes -- Atomic properties, Aqueous solution reactions -- Research, Chlorine -- Chemical properties, Chlorine -- Atomic properties, Chemicals, plastics and rubber industries
Abstract

Rate coefficients for the reactions of hydrated electrons and hydroxyl radicals with various chloroethanes are determined in aqueous solutions using pulse radiolysis techniques. The rate coefficients for the hydrated electron increase from 0.17 X 10(super 9) to 16.3 X 10(super 9) M(super -1) s(super -1) with increasing number of chlorine atoms from monochloroethane to hexachloroethane.

Published
2005

40. Effects of track structure on the ion radiolysis of the Frickie dosimeter

Author

Pimblott, Simon M. and LaVerne, Jay A.

Subjects
Energy transfer -- Analysis, Radiolysis -- Usage, Radiation -- Research, Chemistry, Physical and theoretical -- Research, Chemicals, plastics and rubber industries
Abstract

The chemistry of the Fricke dosimeter caused by low and high linear energy transfer (LET) radiation is modeled using stochastic IRT technique. A considerable effect of particle type and energy on the reactivity of the Fricke dosimeter is observed, which reflects the competition between intra-track reaction of the radiation-induced radicals, diffusion and scavenging.

Published
2002

41. Positronium formation dynamics in radiolytic tracks: a computer simulation study

Author

Garcia, Alfonso Alba, Pimblott, Simon M, Schut, Henk, Veen, Anton van, and Siebbeles, Laurens D. A.

Subjects
Chemistry, Physical and theoretical -- Research, Positronium -- Physiological aspects, Dynamics -- Research, Radiation chemistry -- Research, Chemicals, plastics and rubber industries
Published
2002

42. Radiation-Assisted Formation of Metal Nanoparticles in Molten Salts

Author

Dias, Elaine T., primary, Gill, Simerjeet K., additional, Liu, Yang, additional, Halstenberg, Phillip, additional, Dai, Sheng, additional, Huang, Jiahao, additional, Mausz, Julia, additional, Gakhar, Ruchi, additional, Phillips, William C., additional, Mahurin, Shannon, additional, Pimblott, Simon M., additional, Wishart, James F., additional, and Frenkel, Anatoly I., additional

Published
2020
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45. Design and performance of high-temperature furnace and cell holder for in situ spectroscopic, electrochemical, and radiolytic investigations of molten salts

Author

Phillips, William C., primary, Gakhar, Ruchi, additional, Horne, Gregory P., additional, Layne, Bobby, additional, Iwamatsu, Kazuhiro, additional, Ramos-Ballesteros, Alejandro, additional, Shaltry, Michael R., additional, LaVerne, Jay A., additional, Pimblott, Simon M., additional, and Wishart, James F., additional

Published
2020
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46. Application of stochastic models to radiation chemistry

Author

Pimblott, Simon M.

Subjects
541.38, Stochastic models, Radiation chemistry
Abstract

This thesis addresses one area of major interest in reaction kinetics, the theoretical description of recombination in nonhomogeneous systems. The reaction of the highly reactive particles formed by the passage of ionising radiation through a medium is an important example of this type of system. Stochastic effects are apparent in every stage of the development of a radiolysis system: in the interaction between the radiation and the medium and in the diffusion and reaction processes that follow. Conventional models for nonhomogeneous kinetics in radiation chemistry are based upon a deterministic analysis. These models are appraised together with an alternative stochastic approach. Three stochastic methods are discussed: a full Monte Carlo simulation of the diffusion and reaction and two approximate models based upon an independent pairs approximation. It is important that any kinetic model accurately describes the system it purports to represent and this can only be assured by extensive validation. The stochastic models are developed to encompass the diffusion-controlled reactions of ions and radicals and to include the effects of a bulk electrolyte upon the reactions between ions. To model a realistic radiation chemistry reaction scheme, it is necessary to consider reactions that are not fully diffusion-controlled. The radiation boundary condition is introduced and used to extend stochastic modelling to partially diffusion-controlled reactions. Recombination in an anisotropic environment is also considered. Although a complete analysis of the chemistry of a radiolysis system requires a complex reaction scheme, the scheme can be simplified, in acid and in alkali, by the use of an instantaneous scavenging approximation. In acid, this approximation produces a simple three reaction mechanism based upon five species: H, OH, H2 , H20 and H202 . The acid system is used to demonstrate the stochastic treatment of realistic kinetics. The instantaneous scavenging approximation is examined in detail and techniques are developed for the explicit modelling of reactions with a homogeneously distributed scavenger. A stochastic treatment of nonhomogeneous reaction kinetics requires a description of the initial spatial distribution of the reacting particles. A rudimentary Monte Carlo simulation is used to determine a simple distribution of clusters of reactive particles similar to that found along the path of a high energy electron in water. This distribution provides a suitable basis for kinetic simulation. The kinetics of a more detailed idealised track structure are also considered and the stochastic and deterministic kinetics of extended particle distributions are discussed.

Published
1988

48. On the radiation chemical kinetics of the precursor to the hydrated electron

Author

Pimblott, Simon M. and LaVerne, Jay A.

Subjects
Radiation chemistry -- Research, Hydrates -- Research, Electrons -- Research, Chemicals, plastics and rubber industries
Abstract

The role of the precursor to the hydrated electron in the radiation chemistry of water and several scavenger systems was investigated. Comparisons of the predictions of stochastic diffusion kinetic computations using electron track structures with experimental scavenger data showed that the precursor affects the total yield of electrons scavenged in several systems. The influence of the precursor scavenging on yields is dependent on the scavenger of interest and on the rate coefficient of the scavenger's reaction with the hydrated electron.

Published
1998

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