Documents disponibles écrits par cet auteur

Oxidation of tungstate-containing green rust (Cl–) in aqueous solution / K. Shinoda in Materials and corrosion, Vol. 63 N° 4 (Avril 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 343–349 Titre : Oxidation of tungstate-containing green rust (Cl–) in aqueous solution Type de document : texte imprimé Auteurs : K. Shinoda, Auteur ; S. Fujieda, Auteur ; S. Tsuri, Auteur Année de publication : 2012 Article en page(s) : pp. 343–349 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Green  rust;  iron  oxyhydroxide;  tungstate;  oxidation;  X-ray  diffraction;  X-ray  absorption  spectroscopy Résumé : The influence of tungstate on the oxidation of green rust [GR(Cl–)], which contains both Fe(II) and Fe(III), was investigated by synthesizing suspensions of GR(Cl–) containing tungstate and oxidizing them via injection of N2 gas containing O2. XRD and TEM analyses were used for characterizing the solid particles formed during synthesis and oxidation. The results showed that the formation of fine α-FeOOH was enhanced by the addition of tungstate to the GR(Cl–) suspensions, while GR(Cl–) without tungstate was transformed primarily into γ-FeOOH. The pH, oxidation-reduction potential (ORP), and dissolved oxygen (DO) values of the aqueous solution were measured during oxidation of GR(Cl–) with and without tungstate. The results showed that whereas the pH value of the solution was decreased and the ORP value was increased monotonically by oxidation of GR(Cl–), the pH and ORP values during oxidation the GR(Cl–) suspension containing tungstate revealed characteristic changes with time. XAS was also used for characterizing the chemical state and local structure of tungstate in the oxidized particles. The results indicated that the local structure of WOmath image was essentially retained in the particles precipitated from GR(Cl–) suspensions. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005922/abstract [article] Oxidation of tungstate-containing green rust (Cl–) in aqueous solution [texte imprimé] / K. Shinoda, Auteur ; S. Fujieda, Auteur ; S. Tsuri, Auteur . - 2012 . - pp. 343–349. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 4 (Avril 2012) . - pp. 343–349 Mots-clés : Green  rust;  iron  oxyhydroxide;  tungstate;  oxidation;  X-ray  diffraction;  X-ray  absorption  spectroscopy Résumé : The influence of tungstate on the oxidation of green rust [GR(Cl–)], which contains both Fe(II) and Fe(III), was investigated by synthesizing suspensions of GR(Cl–) containing tungstate and oxidizing them via injection of N2 gas containing O2. XRD and TEM analyses were used for characterizing the solid particles formed during synthesis and oxidation. The results showed that the formation of fine α-FeOOH was enhanced by the addition of tungstate to the GR(Cl–) suspensions, while GR(Cl–) without tungstate was transformed primarily into γ-FeOOH. The pH, oxidation-reduction potential (ORP), and dissolved oxygen (DO) values of the aqueous solution were measured during oxidation of GR(Cl–) with and without tungstate. The results showed that whereas the pH value of the solution was decreased and the ORP value was increased monotonically by oxidation of GR(Cl–), the pH and ORP values during oxidation the GR(Cl–) suspension containing tungstate revealed characteristic changes with time. XAS was also used for characterizing the chemical state and local structure of tungstate in the oxidized particles. The results indicated that the local structure of WOmath image was essentially retained in the particles precipitated from GR(Cl–) suspensions. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201005922/abstract

Transformation of green rust (Cl−) into different oxyhydroxides in aqueous solution containing molybdenum ions / F. Nagata in Materials and corrosion, Vol. 62 N° 12 (Décembre 2011) 

Public ISBD [article]  in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1100–1105 Titre : Transformation of green rust (Cl−) into different oxyhydroxides in aqueous solution containing molybdenum ions Type de document : texte imprimé Auteurs : F. Nagata, Auteur ; K. Inoue, Auteur ; S. Fujieda, Auteur Année de publication : 2012 Article en page(s) : pp. 1100–1105 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Green  rust  Iron  oxyhydroxide  Molybdenum  Oxidation  X-ray  diffraction Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : To investigate the influence of the addition of molybdenum ions on the transformation of green rust GR(Cl−) comprising Fe(II) and Fe(III) into different oxyhydroxides, suspensions of GR(Cl−) containing molybdenum ions were oxidized by passing nitrogen gas containing oxygen through the suspensions. X-ray diffraction (XRD) was used for identifying the solid particles formed by oxidation. The results showed that in the presence of molybdenum ions, the formation of β-FeOOH and α-FeOOH was enhanced as compared to that of γ-FeOOH in the GR(Cl−) suspensions. This implied that the molybdenum ions interacted with the chloride ions obtained from GR(Cl−) and induced the formation of β-FeOOH that contained chloride ions. Transmission electron micrographs of the solid particles showed that the particle size of the resulting oxyhydroxides was considerably reduced because of the addition of the molybdenum ions. The pH and oxidation–reduction potential (ORP) of the aqueous solution were also measured during the oxidation. The addition of molybdenum ions was found to cause characteristic changes in the pH and ORP in the initial stage of the oxidation. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905627/abstract [article] Transformation of green rust (Cl−) into different oxyhydroxides in aqueous solution containing molybdenum ions [texte imprimé] / F. Nagata, Auteur ; K. Inoue, Auteur ; S. Fujieda, Auteur . - 2012 . - pp. 1100–1105. Génie Mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 62 N° 12 (Décembre 2011) . - pp. 1100–1105 Mots-clés : Green  rust  Iron  oxyhydroxide  Molybdenum  Oxidation  X-ray  diffraction Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : To investigate the influence of the addition of molybdenum ions on the transformation of green rust GR(Cl−) comprising Fe(II) and Fe(III) into different oxyhydroxides, suspensions of GR(Cl−) containing molybdenum ions were oxidized by passing nitrogen gas containing oxygen through the suspensions. X-ray diffraction (XRD) was used for identifying the solid particles formed by oxidation. The results showed that in the presence of molybdenum ions, the formation of β-FeOOH and α-FeOOH was enhanced as compared to that of γ-FeOOH in the GR(Cl−) suspensions. This implied that the molybdenum ions interacted with the chloride ions obtained from GR(Cl−) and induced the formation of β-FeOOH that contained chloride ions. Transmission electron micrographs of the solid particles showed that the particle size of the resulting oxyhydroxides was considerably reduced because of the addition of the molybdenum ions. The pH and oxidation–reduction potential (ORP) of the aqueous solution were also measured during the oxidation. The addition of molybdenum ions was found to cause characteristic changes in the pH and ORP in the initial stage of the oxidation. DEWEY : 620.1 ISSN : 0947-5117 En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905627/abstract