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Title: Carbon dioxide sensing properties of bismuth cobaltite
Author: Felix, M.V.
Rodriguez-Rojas, R.A.
Castaneda-Contreras, J.
Nava, R.
Consolati, G.
Castano, V.M.
Issue Date: 2006
Abstract: Eight novel hybrid silica gel-succinic acid-zinc acetate samples were analyzed through Positron annihilation lifetime spectroscopy in order to study average free volume quantities and free volume distributions. The aim of this work was to understand the type of porosity within these species and its relationship with surface textural properties (tested by the BET method) and catalytic activity. We found a noticeable dependence of o-Ps lifetimes on the nature of each modifier agent (succinic acid, Zn acetate, succinic acid-Zn acetate) fixed on the surface of SiO2 and SiO2-Al2O3 particles. We observed the trend of the Zinc acetate to create mesopores among silica particles, while succinic acid acts as a positronium quencher and a nanoporosity performer. Long o-Ps lifetimes were decomposed into two components accounting for the existence of interparticle and intraparticle holes, however discrepancies beyond elementary facts between the BET method measurements and our positronium calculations were found. A discussion of the kind of open spaces analysis necessary to fully understand the porosity in these hybrid materials is also presented. " 2006 Elsevier B.V. All rights reserved.",,,,,,"10.1016/j.optmat.2006.03.027",,,"","",,,,,,"1",,"Optical Materials",,"153
WOS",,,,,,"Hybrid silica gels; Mesoporous materials; Nanoporosity; Positronium annihilation",,,,,,"Nanoporosity studies of novel catalysts through positronium annihilation",,"Article" "41686","123456789/35008",,"Casas-Cabanas, M., Laboratoire CRISMAT, UMR 6508, CNRS ENSICAEN, 6 bd Maréchal Juin, 14050 Caen, France; Chadwick, A.V., Functional Materials Group, School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom; Palacán, M.R., Institut de Cincia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, E-08193 Bellaterra, Catalonia, Spain; Michel, C.R., Departamento de Física CUCEI, Universidad de Guadalajara, Blvd. M. García Barragán 1421, 44410 Guadalajara, Jalisco, Mexico",,"Casas-Cabanas, M.
Chadwick, A.V.
Palacin, M.R.
Michel, C.R.",,"2011",,"Bismuth cobaltite with sillenite-type structure was prepared from Co(OH)2 and Bi(NO3)3 6H2O through solid state reaction at 600 °C. Neutron powder diffraction (NPD) data and X-ray absorption spectroscopy revealed the existence of mixed oxidation states for cobalt in this compound, the chemical formula being Bi 12(Bi0.55Co0.45)O19.6. The gas sensing properties of Bi12(Bi0.55Co0.45)O 19.6 were characterized by alternating current, at 200, 300 and 400 °C. The optimal response was observed at 400 °C, using a frequency of 100 kHz. " 2011 Elsevier B.V.
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