Download Chemistry on Modified Oxide and Phosphate Surfaces: by Robson Fernandes de Farias PDF

By Robson Fernandes de Farias

This name within the authoritative Interface technological know-how and know-how sequence provides the most important gains and functions of transformed oxide and phosphate surfaces. * Examines either easy and utilized elements * comprises examples from fresh guides

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Additional info for Chemistry on Modified Oxide and Phosphate Surfaces: Fundamentals and Applications

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100 g of the hexagonal templated zirconia matrix was suspended, under magnetic stirring, for 60 min, into 20 cm3 of an aqueous solutions of Co(II), Ni(II), Cu(II), and Zn(II) previously prepared by dissolution of the respective sulfates (with exception of cobalt, for which chloride was used). 5°C). 2Â10–3 mol dm–3 EDTA solution. The X-ray powder diffraction pattern for the modified matrix is shown in Fig. 6. The adsorption results are summarized in Fig. 7. 9 nm, associated with the 100 diffraction plane of a hexagonal phase.

This suggests that not only adsorption but also coordination occurs between the europium complex and the nitrogen atoms of the organic moiety, since a large complex/matrix ratio implies a minor amount of nitrogen atoms per complex molecule, that is, a minor amount of nitrogen atoms enters the europium coordination sphere. Taking into account that the emission spectrum of ‘‘free’’ Eu(fod)3 is almost identical to that obtained for the Eu(fod)3-doped LS, it is possible to claim that LS could be used as an inert substrate to support Eu(fod)3 and, possibly, other LCMDs.

Furthermore, such metal sequestrating ability and the consequent nanostructure modifications are observed even if the metal–silica reaction is performed in the solid state and room temperature [5]. By performing a solution calorimetric study, it is possible to verify that the total amount of metal cations that the lamellar matrix is able to sequester as well as its affinity by the metal cations, for example, Ni2þ > Cu2þ > Co2þ [6] is a consequence of the influence of main two factors: the metal–nitrogen coordination enthalpies and the structural disorder provoked into the lamellar network by the metal–nitrogen coordination.

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