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2003). Macromolecules. 36: 855-859. ,Jin G. (2001). Optical properties of silver-dispersed PVP thin film, Mater. Res. Bull. 36(5/6): 853-859. , WD. (2002). The change of the properties of acrylic-based polyurethane via addition of nano-silica, Prog Org Coat. 45:33-42. G. Esteves da Silva1, Manuel Algarra2 and Bruno B. Campos1 1Centro 2Centro de Investigação em Química de Geologia. University of Porto. Porto, Portugal 1. , 2002). , 2009). , 2003). The synthesis, modification, and applicability of cadmium chalcogenide nanocrystals, in particular cadmium sulfide (CdS), have been optimized (Alivisatos, 1996; Weller, 1993).

C). These spectra confirm that the synthesized nanocomposites are indeed DAB capped with CdS, CdS:ZnS and ZnS QDs. Indeed, the presence of the signals due to elements Cd, Zn and S confirm the composition of the QDs, C and N confirms that the synthesized material contains QDs capped with DAB. Also, the presence of signals due to the elements C, O and S suggests that MPA is capping QDs. These results suggest that the QDs are stabilized in water due to the capping of both the dendrimer and MPA. Fig.

Preparation and Characterization of Inorganic-Organic Nanocomposite Coatings • • • • 17 The modification of the structures of all molecular species and the bonds formed or destroyed during the sol-gel process were endorsed by using the FTIR spectroscopy. Formation of Si-O-C bond during the reaction and opening the epoxy ring was confirmed by FTIR spectra. Thermal stability of the prepared coating samples was confirmed by using TGA. SEM micrographs show that the Small dispersed particles of 20-70 nm diameter have been shoved by SEM micrographs.

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