Zobrazeno 1 - 10
of 13
pro vyhledávání: '"William S. Cardoso"'
Publikováno v:
International Journal of Electrochemical Science, Vol 1, Iss 7, Pp 343-353 (2006)
A sensitive stripping voltammetric procedure for ultra trace copper determination is reported in this paper. A Catalytic-Adsorptive Stripping Voltammetric (CASV) mechanism is proposed to interpret the amplified sensitivity. The procedure is based on
Externí odkaz:
https://doaj.org/article/55c59a6793184dd585baa58cdd608579
Autor:
Wendell M. Costa, Jiujun Zhang, William S. Cardoso, Eliane R. de Sousa, Cícero Wellington Brito Bezerra, Aldaléa L. B. Marques, Chaojie Song, Edmar P. Marques
Publikováno v:
Journal of Applied Electrochemistry. 40:375-382
A ruthenium (III) hexacyanoferrate (Ru(HCF)) film coated on a glassy carbon electrode was explored as an electrocatalyst for hydrazine oxidation. Surface cyclic voltammograms of Ru(HCF) film showed four reversible one-electron redox waves. Two, which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f722c70218ae11d394342502ac88303a
https://doi.org/10.1007/s10800-009-0006-0
https://doi.org/10.1007/s10800-009-0006-0
Autor:
Edmar P. Marques, Chaojie Song, Vera L. N. Dias, William S. Cardoso, Isaide de Araujo Rodrigues, Jiujun Zhang, Aldaléa L. B. Marques, Cícero Wellington Brito Bezerra, Antonio Gouveia de Sousa, Hansan Liu, Jaime Soares Boaventura, Wendell M. Costa
Publikováno v:
Journal of Applied Electrochemistry. 39:55-64
Nickel-dimethylglyoxime complex (abbreviated as Ni(II)(DMG)2) modified carbon paste and graphite electrodes were prepared by mixing Ni(II)(DMG)2 with graphite paste, and coating Ni(II)(DMG)2 to the graphite surface. It is necessary to cycle the elect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03c23294a52ecdc86ea18d987535490c
https://doi.org/10.1007/s10800-008-9636-x
https://doi.org/10.1007/s10800-008-9636-x
Publikováno v:
Journal of Electroanalytical Chemistry. 602:29-36
Phosphated silica–niobia, SiO 2 / Nb 2 O 5 / H 2 PO 4 - , presenting high specific surface area (SBET = 580 m2 g−1) was used as substrate base to adsorb 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-21-H,23-H-porphyrin and furthermore metallated with N
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ded47ae784ded86820110dab071288c8
https://doi.org/10.1016/j.jelechem.2006.11.028
https://doi.org/10.1016/j.jelechem.2006.11.028
Autor:
Yoshitaka Gushikem, William S. Cardoso
Publikováno v:
Journal of Electroanalytical Chemistry. 583:300-306
This paper describes the immobilization of 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-21H,23H-porphyrin ion on SiO 2 /SnO 2 /Phosphate obtained by the sol–gel processing method. The porphyrin was adsorbed on the surface of the modified material and fu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd4da88b2141136ec83e018e8206cab6
https://doi.org/10.1016/j.jelechem.2005.06.015
https://doi.org/10.1016/j.jelechem.2005.06.015
Publikováno v:
Electrochimica Acta. 50:4378-4384
This paper describes the immobilization procedure of 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-21-H,23-H-porphyrin ion on SiO 2 /SnO 2 /phosphate, obtained by the sol–gel processing method. P 2p X-ray photoelectron and the 31 P MAS NMR spectra reveal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::61f51a2a7da1791d391ada66e6711428
https://doi.org/10.1016/j.electacta.2005.02.001
https://doi.org/10.1016/j.electacta.2005.02.001
Autor:
Yoshitaka Gushikem, William S. Cardoso
Publikováno v:
Química Nova. 28:723-726
The present paper describes the synthesis of crystalline zirconium hydrogen phosphate by direct precipitation and its intercalation with pyridine and n-butylamine. The simple experiment was tested in the undergraduate inorganic chemistry laboratory c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::791dff7a5ca5f7cb0b457a999c33b938
https://doi.org/10.1590/s0100-40422005000400029
https://doi.org/10.1590/s0100-40422005000400029
Publikováno v:
Journal of Electroanalytical Chemistry. 574:291-297
A carbon paste of SiO2/Nb2O5 material was used as the electrode in the development of a dissolved dioxygen sensor in 1.0 mol l−1 KCl solution at pH 6.2. The material was prepared by the sol–gel method. In the investigation of its electrochemical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba175017bbb906a003e0abd93ceee8db
https://doi.org/10.1016/j.jelechem.2004.08.010
https://doi.org/10.1016/j.jelechem.2004.08.010
Autor:
William S. Cardoso, Maria Suzana P. Francisco, Yoshitaka Gushikem, Yuriy V. Kholin, Richard Landers
Publikováno v:
Langmuir. 20:8707-8714
In this work, the structural and textural properties of the SiO2/Nb2O5 system prepared by the sol-gel method and then modified by phosphoric acid were studied. The different materials were prepared, with three different mol % Nb2O5 (2.5, 5.0, and 7.5
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f417bc4cc0ad5dd7e6b0c5665224157e
https://doi.org/10.1021/la049000t
https://doi.org/10.1021/la049000t
Publikováno v:
Solid State Ionics. 167:165-173
SiO2/SnO2 mixed oxides were prepared by the sol–gel processing method using SnI4 as the tin oxide precursor reagent. Solids with Sn compositions (in wt.%) of 4.1, 12.9 and 18.4 and presenting specific surface areas (determined by the BET method) of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31e70cd42bdc8664fa47711cf8cd33fa
https://doi.org/10.1016/j.ssi.2003.12.017
https://doi.org/10.1016/j.ssi.2003.12.017