CONICET | Buscador de Institutos y Recursos Humanos

In this research line, the development of mesoporous nanoparticles with hexagonal mesoporous MCM-41 type structure was synthetized from the hydrolytic condensation of tetraethoxysilane (TEOS) at basic pH and using hexadecyltrimethylammonium bromide (CTAB) as surfactant. Then, a surface modification of the mesoporous nanoparticles was achieved by a Silanization process using aminopropyltriethoxysilane (APTES) and subsequently exposed to a process of nucleation and superficial growth of silver nanoparticles. The synthesized nanoparticles were incorporated into a coating precursor solution (sol) synthesized from the hydrolytic condensation, in an acid medium, of TEOS and glycidoxyproyl-trimethoxysilane (GPTMS). High compatibility between the sol and the synthesized nanoparticles was observed, with no evidence of precipitate formation or physicochemical destabilization of the nanocomposite system. By the immersion method and subsequent thermal densification treatment at 150 °C, complete coatings were obtained on microscopy glass slides, without formation of microcracks or defects. The characterization of synthetized nanoparticles was performed by Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) and UV-visible spectroscopy, X-ray Diffraction (XRD), X-ray Fluorescence (XRF) and Microscopy. Transmission Electronics (TEM). Finally, an electrochemical characterization was carried out, by using conductivity and electrochemical impedance methods. The conductivity measurements aim to study the kinetics of silver incorporation into the nanoparticles, while the EIS provides information on the faradaic and capacitive processes related to the silver migration process towards and from the mesoporous nanoparticles, with its microbial activity

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