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246 results on '"Stievano, L."'

61. Nb-Doped TiO2 Nanofibers for Lithium Ion Batteries

Author

Fehse, M., primary, Cavaliere, S., additional, Lippens, P. E., additional, Savych, I., additional, Iadecola, A., additional, Monconduit, L., additional, Jones, D. J., additional, Rozière, J., additional, Fischer, F., additional, Tessier, C., additional, and Stievano, L., additional

Published
2013
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63. On the electrochemical encounter between sodium and mesoporous anatase TiO2 as a Na-ion electrode.

Author

Louvain, N., Henry, A., Daenens, L., Boury, B., Stievano, L., and Monconduit, L.

Subjects
TITANIUM dioxide, ELECTROCHEMICAL analysis, MESOPOROUS materials, SODIUM ions, ELECTRODES, CHEMICAL synthesis
Abstract

Mesoporous anatase titanium dioxide (TiO2) is prepared by an easily up-scalable synthesis protocol, using relatively inexpensive precursors. We demonstrate here that submicronic anatase TiO2 crystals show unexpected performances as electrodes of Na-ion batteries (NaBs). They exhibit highly stable reversible specific capacities of up to 200 mA h g−1 and excellent cyclability at moderate current rates at an average potential of 1.0 V vs. Na+/Na. While pseudocapacitance may appear to be the main process driving the reactions between the sodium ions and TiO2 during the first discharge above 1 V vs. Na+/Na, operando Raman and X-ray diffraction studies show that the TiO2 anatase structure is nearly entirely lost below 0.25 V vs. Na+/Na. The subsequent cycling is based on amorphous sodium titanate materials. [ABSTRACT FROM AUTHOR]

Published
2016
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68. Mossbauer spectroscopy in the characterisation of polymetallic cluster compounds: a triple Mossbauer study of (PPh4)[Fe2Ir2(CO)(12){mu(3)-Au(PPh3)}]

Author

Stievano, L, DELLA PERGOLA, R, Wagner, F, Wagner, FE, DELLA PERGOLA, ROBERTO, Stievano, L, DELLA PERGOLA, R, Wagner, F, Wagner, FE, and DELLA PERGOLA, ROBERTO

Abstract

The mixed-metal cluster compound (PPh4)[Fe2Ir2(CO)(12){mu(3)-Au(PPh3)}], which has a trigonal bipyramidal core consisting of five atoms of three different Mossbauer isotopes, was studied by Ir-193, Au-197 and Fe-57 Mossbauer spectroscopy. The nature and the chemical character of the atoms located at the different sites are discussed with respect to their Mossbauer spectra.

Published
2004

74. Predictive value of hematological and phenotypical parameters on postchemotherapy leukocyte recovery

Author

Bononi, A., primary, Lanza, F., additional, Ferrari, L., additional, Gusella, M., additional, Gilli, G., additional, Abbasciano, V., additional, Campioni, D., additional, Russo, A., additional, Menon, D., additional, Albertini, F., additional, Stievano, L., additional, Barile, C., additional, Crepaldi, G., additional, Toso, S., additional, Ferrazzi, E., additional, and Pasini, F., additional

Published
2009
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76. Effect of neoadjuvant combined modality therapy with weekly docetaxel (D) and cisplatin (P), 5-fluorouracil (5-FU) continuous infusion (c.i.), and concurrent radiotherapy (RT) on pathological response rate in esophageal cancers (EC): A phase II study

Author

Pasini, F., primary, de Manzoni, G., additional, Stievano, L., additional, Grandinetti, A., additional, Maluta, S., additional, Capirci, C., additional, Durante, E., additional, Bonetti, A., additional, Zanoni, A., additional, and Cordiano, C., additional

Published
2009
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79. Iron-Iridium Mixed-Metal Carbonyl Clusters: A Mössbauer Study of the Structure and of the Adsorption of [Fe2Ir2(CO)12]2- on MgO

Author

Stievano, L, Calogero, S, Psaro, R, Guidotti, M, Della Pergola, R, Wagner, F, Wagner, F E, Stievano, L, Calogero, S, Psaro, R, Guidotti, M, Della Pergola, R, Wagner, F, and Wagner, F E

Abstract

193 Ir and 57Fe Mössbauer spectroscopy was used to investigate the structure of the [Fe2Ir2(CO)12]2- cluster compound and the adsorption of this cluster on hydrated MgO. Supported samples were prepared by impregnation of the magnesia with solutions of [Et4N]2[Fe2Ir2(CO)12] in acetone. The Mössbauer and FT-IR spectra of the MgO-supported cluster confirm that the bimetallic carbonyl is molecularly physisorbed onto MgO without undergoing any transformation or decomposition. The easy solvent extraction of the intact cluster from the oxide surface excludes ion pairing between the cluster anion and the Mg2+ surface sites. Mössbauer spectra are in agreement with the refined structure of the molecular cluster and the temperature dependence of the 57Fe Mössbauer spectra above 80 K is consistent with the low degree of interaction of the cluster with the support. This technique, therefore, appears to be promising in order to infer structural information when X-ray determination fails.

Published
2001

82. O.1 CGA in daily practice

Author

Bononi, A., primary, Milena, G., additional, Stievano, L., additional, Baldan, S., additional, Barile, C., additional, Menon, D., additional, and Pasini, F., additional

Published
2007
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90. Formation of gold nanoparticles in gold ruby glass: The influence of tin.

Author

Lippens, P. -E., Jumas, J. -C., Génin, J. -M. R., Haslbeck, S., Martinek, K. -P., Stievano, L., and Wagner, F. E.

Abstract

197Au and 119Sn Mössbauer spectroscopy was used to study the effect of tin on the formation of gold nanoparticles in gold ruby glasses containing 200 ppm of gold and up to 2 wt.% of tin. The tin was found to speed up the formation of the metallic nanoparticles during annealing at temperatures around 600°C and to cause very small particles with sizes of only a few nanometres to be formed, whereas fewer but larger particles are formed in the absence of tin. This has consequences for the colour of the glasses, which changes from purple red for virtually tin-free to brown for tin-rich glasses. [ABSTRACT FROM AUTHOR]

Published
2007
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91. New Fe2TiO5-based nanoheterostructured mesoporous photoanodes with improved visible light photoresponses.

Author

Courtin, E., Baldinozzi, G., Sougrati, M. T., Stievano, L., Sanchez, C., and Laberty-Robert, C.

Abstract

Triphasic nanocrystalline porous material based Fe2-TiO5 anatase, pseudo-brookite and hematite are generated via a simple templated growth based strategy followed by carefully controlled temperature/ atmosphere treatments. As shown by XRD, SEM, and TEM experiments the resulting nano-crystalline mesoporous films exhibit optimized bicontinuous pore-solid architectures and high surface-areas. Môssbauer spectroscopy and XPS analyses indicate that FeIII is the main iron oxidation state present in the films. [ABSTRACT FROM AUTHOR]

Published
2014
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95. Mössbauer Spectroscopy in the Characterisation of Polymetallic Cluster Compounds: a Triple Mössbauer Study of (PPh4)[Fe2Ir2(CO)12{μ3-Au(PPh3)}].

Author

Stievano, L., Pergola, R. Della, and Wagner, F. E.

Subjects
*METAL clusters, *MOSSBAUER spectroscopy, *SPECTRUM analysis, *ATOMS, *CONSTITUTION of matter, *PHYSICS
Abstract

The mixed-metal cluster compound (PPh4)[Fe2Ir2(CO)12{μ3-Au(PPh3)}], which has a trigonal bipyramidal core consisting of five atoms of three different Mössbauer isotopes, was studied by 193Ir, 197Au and 57Fe Mössbauer spectroscopy. The nature and the chemical character of the atoms located at the different sites are discussed with respect to their Mössbauer spectra. [ABSTRACT FROM AUTHOR]

Published
2004
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96. Mössbauer Spectroscopy in the Characterisation of Polymetallic Cluster Compounds: a Triple Mössbauer Study of (PPh4)[Fe2Ir2(CO)12{μ3-Au(PPh3)}].

Author

Stievano, L., Pergola, R. Della, and Wagner, F. E.

Subjects
METAL clusters, MOSSBAUER spectroscopy, SPECTRUM analysis, ATOMS, CONSTITUTION of matter, PHYSICS
Abstract

The mixed-metal cluster compound (PPh4)[Fe2Ir2(CO)12{μ3-Au(PPh3)}], which has a trigonal bipyramidal core consisting of five atoms of three different Mössbauer isotopes, was studied by 193Ir, 197Au and 57Fe Mössbauer spectroscopy. The nature and the chemical character of the atoms located at the different sites are discussed with respect to their Mössbauer spectra. [ABSTRACT FROM AUTHOR]

Published
2004
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97. The Application of 119Sn Mössbauer Spectroscopy to the Investigation of Glass Coatings: Evolution of the Tin Species in Lead-Rich White Glazes.

Author

Stievano, L., Bertelle, M., Calogero, S., and Wagner, F. E.

Subjects
*MOSSBAUER spectroscopy, *SURFACE coatings, *GLASS, *TIN, *SPECTRUM analysis, *LEAD
Abstract

119Sn Mössbauer spectroscopy and X-ray diffraction were used to study the state of tin in opaque lead rich glazes, where small cassiterite (SnO2) particles serve as opacifiers. [ABSTRACT FROM AUTHOR]

Published
2004
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98. Application of 57Fe Mössbauer Spectroscopy for the Characterisation of Materials of Archaeological Interest: The Work Performed in Italy.

Author

Stievano, L., Bertelle, M., and Calogero, S.

Subjects
MOSSBAUER spectroscopy, SPECTRUM analysis, ANTIQUITIES, MATERIAL culture, HISTORICAL archaeology
Abstract

We present the development of the Mössbauer method as applied to the investigation of archaeological artefacts in Italy from 1980 on. In this way, we attempt to demonstrate the gradual improvement of the results and their increasing usefulness to archaeologists. [ABSTRACT FROM AUTHOR]

Published
2003
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99. A 121Sb Mössbauer Study of the Chemical State of Antimony in V–Sb–O Mixed-Oxide Catalysts for the Ammoxidation of Propane.

Author

Stievano, L., Wagner, F., Zanthoff, H., and Calogero, S.

Abstract

The structural changes of two representative samples of a group of V-Sb-oxide catalysts, a vanadium-rich and an antimony-rich specimen, are investigated by 121Sb Mössbauer spectroscopy after treatment under propene or hydrogen at 673 K. The as-prepared catalysts contain both Sb(V) and Sb(III) as crystalline and microcrystalline α-Sb2O4 and VSbO4, as well as an additional amorphous V5+ oxide phase. The oxidation state of antimony does not change upon exposure to propene, whereas a partial reduction can be obtained by a more intense reduction under hydrogen. The Mössbauer results indicate that the antimony in VSbO4 can be reduced more easily than that in α-Sb2O4, which appears to be more stable. These results are discussed in view of the observed depletion of vanadium at the surface of the catalyst particles under reaction conditions. [ABSTRACT FROM AUTHOR]

Published
2002
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100. Nb-Doped TiO2Nanofibers for Lithium Ion Batteries

Author

Fehse, M., Cavaliere, S., Lippens, P. E., Savych, I., Iadecola, A., Monconduit, L., Jones, D. J., Rozière, J., Fischer, F., Tessier, C., and Stievano, L.

Abstract

Niobium-doped nanofibers elaborated by facile, single-step electrospinning present a higher rate capability in electrochemical cycling experiments than nondoped materials. This is attributed to the reduction of Li+diffusion path lengths and enhanced intimate interparticle contact, in combination with improved intraparticle conductivity. Niobium doping has a significant effect on the electronic structure and provokes a substantial decrease in particle size.

Published
2013
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