Abstract

CORTES ESCOBEDO, C. A.; MARTINEZ FLORES, J. O.; MUNOZ-SALDANA, J.  and  YANEZ LIMON, J. M.. Preparación de monolitos de sílice con vanadio como modificador de red e incorporación de esferas nanométricas monodispersas para inducir el fenómeno de difracción en el rango de la luz visible. Superf. vacío [online]. 2006, vol.19, n.4, pp.13-18. ISSN 1665-3521.

On this work we propose a route to synthesize a silica system by using Sol Gel process in acidic and alkaline media -starting from TEOS as precursor in both cases- allowing visible light diffraction. Incorporation of nanometric silica spheres prepared by hydrolysis- condensation reactions with ammonium hydroxide as morphologic catalyst was made in a gel matrix with vanadium ions as network modifiers prepared by hydrolysis-condensation reactions but in acidic media. The size of monodisperse submicrometric spheres prepared is in the range of the visible light. A comparison between monoliths obtained by commercial nanospheres (OPTA) acidified and those obtained from TEOS/submicrometric spheres prepared is presented, both systems were dried at room temperature and with a temperature rate.

Keywords : Sol gel; Network modifier; Vanadium; Ppals; Photonic crystals.