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5 results on '"Kleppe, Annette"'

1. Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays

Author

O'Leary, Mel (author), Boscolo, Daria (author), Breslin, Nicole (author), Brown, J.M.C. (author), Dolbnya, Igor P. (author), Emerson, Chris (author), Figueira, Catarina (author), Fox, Oliver J.L. (author), Grimes, David Robert (author), Ivosev, Vladimir (author), Kleppe, Annette K. (author), McCulloch, Aaron (author), Pape, Ian (author), Polin, Chris (author), Wardlow, Nathan (author), Currell, Fred J. (author), O'Leary, Mel (author), Boscolo, Daria (author), Breslin, Nicole (author), Brown, J.M.C. (author), Dolbnya, Igor P. (author), Emerson, Chris (author), Figueira, Catarina (author), Fox, Oliver J.L. (author), Grimes, David Robert (author), Ivosev, Vladimir (author), Kleppe, Annette K. (author), McCulloch, Aaron (author), Pape, Ian (author), Polin, Chris (author), Wardlow, Nathan (author), and Currell, Fred J. (author)

Abstract

Absolute measurements of the radiolytic yield of Fe3+ in a ferrous sulphate dosimeter formulation (6 mM Fe2+), with a 20 keV x-ray monoenergetic beam, are reported. Dose-rate suppression of the radiolytic yield was observed at dose rates lower than and different in nature to those previously reported with x-rays. We present evidence that this effect is most likely to be due to recombination of free radicals radiolytically produced from water. The method used to make these measurements is also new and it provides radiolytic yields which are directly traceable to the SI standards system. The data presented provides new and exacting tests of radiation chemistry codes., RST/Applied Radiation & Isotopes

Published
2018
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2. Observation of dose-rate dependence in a Fricke dosimeter irradiated at low dose rates with monoenergetic X-rays

Author

O'Leary, Mel (author), Boscolo, Daria (author), Breslin, Nicole (author), Brown, J.M.C. (author), Dolbnya, Igor P. (author), Emerson, Chris (author), Figueira, Catarina (author), Fox, Oliver J.L. (author), Grimes, David Robert (author), Ivosev, Vladimir (author), Kleppe, Annette K. (author), McCulloch, Aaron (author), Pape, Ian (author), Polin, Chris (author), Wardlow, Nathan (author), Currell, Fred J. (author), O'Leary, Mel (author), Boscolo, Daria (author), Breslin, Nicole (author), Brown, J.M.C. (author), Dolbnya, Igor P. (author), Emerson, Chris (author), Figueira, Catarina (author), Fox, Oliver J.L. (author), Grimes, David Robert (author), Ivosev, Vladimir (author), Kleppe, Annette K. (author), McCulloch, Aaron (author), Pape, Ian (author), Polin, Chris (author), Wardlow, Nathan (author), and Currell, Fred J. (author)

Abstract

Absolute measurements of the radiolytic yield of Fe3+ in a ferrous sulphate dosimeter formulation (6 mM Fe2+), with a 20 keV x-ray monoenergetic beam, are reported. Dose-rate suppression of the radiolytic yield was observed at dose rates lower than and different in nature to those previously reported with x-rays. We present evidence that this effect is most likely to be due to recombination of free radicals radiolytically produced from water. The method used to make these measurements is also new and it provides radiolytic yields which are directly traceable to the SI standards system. The data presented provides new and exacting tests of radiation chemistry codes., RST/Applied Radiation & Isotopes

Published
2018
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3. Correlated defect nanoregions in a metal-organic framework

Author

Cliffe, Matthew J., Wan, Wei, Zou, Xiaodong, Chater, Philip A., Kleppe, Annette K., Tucker, Matthew G., Wilhelm, Heribert, Funnell, Nicholas P., Coudert, Francois-Xavier, Goodwin, Andrew L., Cliffe, Matthew J., Wan, Wei, Zou, Xiaodong, Chater, Philip A., Kleppe, Annette K., Tucker, Matthew G., Wilhelm, Heribert, Funnell, Nicholas P., Coudert, Francois-Xavier, and Goodwin, Andrew L.

Abstract

Throughout much of condensed matter science, correlated disorder is a key to material function. While structural and compositional defects are known to exist within a variety of metal-organic frameworks (MOFs), the prevailing understanding is that these defects are only ever included in a random manner. Here we show-using a combination of diffuse scattering, electron microscopy, anomalous X-ray scattering and pair distribution function measurements-that correlations between defects can in fact be introduced and controlled within a hafnium terephthalate MOF. The nanoscale defect structures that emerge are an analogue of correlated Schottky vacancies in rocksalt-structured transition metal monoxides and have implications for storage, transport, optical and mechanical responses. Our results suggest how the diffraction behaviour of some MOFs might be reinterpreted, and establish a strategy of exploiting correlated nanoscale disorder as a targetable and desirable motif in MOF design., AuthorCount:10

Published
2014
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4. Synthesis of a Novel Zeolite through a Pressure-Induced Reconstructive Phase Transition Process

Author

Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, Ministerio de Ciencia e Innovación, Generalitat Valenciana, Universitat Politècnica de València, Ministerio de Economía y Competitividad, Jorda Moret, Jose Luis, Rey Garcia, Fernando, Sastre Navarro, German Ignacio, Valencia Valencia, Susana, Palomino Roca, Miguel, Corma Canós, Avelino, Segura Garcia del Rio, Alfredo, Errandonea, Daniel, Lacomba Perales, Raúl, Manjón Herrera, Francisco Javier, Gomis Hilario, Oscar, Kleppe, Annette K., Jephcoat, Andrew P., Amboage, Mónica, Rodríguez-Velamazán, J. Alberto, Universitat Politècnica de València. Instituto Universitario Mixto de Tecnología Química - Institut Universitari Mixt de Tecnologia Química, Universitat Politècnica de València. Departamento de Química - Departament de Química, Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, Ministerio de Ciencia e Innovación, Generalitat Valenciana, Universitat Politècnica de València, Ministerio de Economía y Competitividad, Jorda Moret, Jose Luis, Rey Garcia, Fernando, Sastre Navarro, German Ignacio, Valencia Valencia, Susana, Palomino Roca, Miguel, Corma Canós, Avelino, Segura Garcia del Rio, Alfredo, Errandonea, Daniel, Lacomba Perales, Raúl, Manjón Herrera, Francisco Javier, Gomis Hilario, Oscar, Kleppe, Annette K., Jephcoat, Andrew P., Amboage, Mónica, and Rodríguez-Velamazán, J. Alberto

Abstract

The first pressure-induced solid-phase synthesis of a zeolite has been found through compression of a common zeolite, ITQ-29 (see scheme, Si yellow, O red). The new microporous structure, ITQ-50, has a unique structure and improved performance for propene/propane separation with respect the parent material ITQ-29.

Published
2013

5. Questioning the evidence of Earth's oldest fossils

Author

Brasier, Martin, Green, Owen, Jephcoat, Andrew, Kleppe, Annette, Van Kranendonk, Martin, Lindsay, John, Steele, Andrew, Grassineau, Nathalie, Brasier, Martin, Green, Owen, Jephcoat, Andrew, Kleppe, Annette, Van Kranendonk, Martin, Lindsay, John, Steele, Andrew, and Grassineau, Nathalie

Abstract

Structures resembling remarkably preserved bacterial and cyanobacterial microfossils from ∼3,465-million-year-old Apex cherts of the Warrawoona Group in Western Australia currently provide the oldest morphological evidence for life on Earth and have bee

Published
2002

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