Cobalt(II) phthalocyanine bonded to 3-n-propylimidazole immobilized on silica gel surface: preparation and electrochemical properties
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Cobalt(II) Phthalocyanine Bonded to 3-n-propylimidazole Immobilized on Silica Gel Surface: Preparation and Electrochemical Properties
A ftalocianina de cobalto(II) imobilizada sobre a sílica gel (área superficial SBET = 500 m 2 g) modificada com 3-n-propilimidazol, foi incorporada a um eletrodo de pasta de carbono e mostrou-se eficiente na eletrocatálise da oxidação do ácido oxálico. As interações intermoleculares do complexo, as quais podem normalmente interferir no processo redox, praticamente não foram observadas no presen...
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O comportamento eletroquímico do azul de toluidina (AT) adsorvido sobre a superfície da sílica modificada com óxido de nióbio (SN) foi investigado, utilizando-se eletrodo de pasta de carbono modificada. A imobilização do AT sobre a SN proporcionou alta estabilidade ao eletrodo, por evitar a lixiviação do mediador da superfície do eletrodo. O potencial formal (E) do AT adsorvido foi –113 mV vs. ...
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Enhanced S(1)--> T(1) intersystem crossing of silicon phthalocyanine (SiPc) owing to iron oxide nanoparticles and intense MCD signal of diamagnetic SiPc have been experimentally shown by using SiPcs supported on magnetic silica gel, in which the iron oxide nanoparticles were effectively dispersed.
متن کاملMICROSTRUCTURE AND PROPERTIES OF COLLOIDAL SILICA BONDED MAGNESITE CASTABLE REFRACTORIES
Abstract: Efforts have been carried out in order to use microsilica to develop a forsterite bond rather than other types of binders in the basic refractory castables. According to the higher drying rate and sinterability of colloidal silica, it has been proposed in the recent years. In the present work, effects of replacement of microsilica by colloidal silica evolution of forsterite bond have ...
متن کاملPreparation and electrochemical study of cerium–silica sol–gel thin films
Design and development of suitable multilayered systems for delaying corrosion advance in metals requires that both the alteration mechanisms of the metal and the behaviour and properties of the protective coatings be known. Coatings prepared by the sol–gel method provide a good approach as protective layers on metallic surfaces. This kind of coatings can be prepared from pure chemical reagents...
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ژورنال
عنوان ژورنال: Journal of the Brazilian Chemical Society
سال: 1999
ISSN: 0103-5053
DOI: 10.1590/s0103-50531999000500009