From amorphous phase separations to nanostructured materials in sol–gel derived ZrO2:Eu3+/SiO2 and ZnO/SiO2 composites

Synthesis of tin oxide nanosized crystals embedded in silica matrix through sol–gel process using alkoxide precursors

“…The bands located at 600 and 1120 cm À1 are given by the cyclic SiAO groups [24,48], which were not observed in the SC system. The cyclic SiAO, i.e.…”

“…Transparent gels were obtained after aging in an oven holding at 60°C from 1 to 78 days depending on the acid content but also on the molar ratio of Sn content. The gels were slowly dried at 60°C in a water-saturated atmosphere in order to obtain monolithic xerogels as first proposed by Nogami and Tomozawa [22] and recently implemented in our group [23,24]. The sample labels and gelation time in relation to the preparation parameters are summarized in Table 1.…”

Microstructure of Zirconia-Based Sol-Gel Glasses Studied by SANS

“…as chemical sensors or catalyzers, due to their low cost and good optical properties [1]. In order to overcome some application restrictions, an increasing interest is paid to zirconia [2] as a promising glass-forming component in the last decades. Synthesis of glassy materials using the solgel method brings some advantages in comparison with the conventional melting or sintering.…”

Microstructural evolution of the system Ni–ZrO2–SiO2 synthesized by the sol–gel process

“…In order to obtain amorphous and/or semicrystalline materials with different molar ratios of Zr:Si, processes like sol-gel, solid state reaction and mechanochemical synthesis are now being applied. For example, using a sol-gel method, Carmona et al obtained glass fibers of ZrO 2 -SiO 2 useful for the protection of historical glasses [6] and fuel cells electrolytes [7]; also Gaudon et al [8] prepared glasses in the system SiO 2 -ZrO 2 containing up to 50 mol % ZrO 2 . In addition Pr, V, Co and Fe doped ZrO 2 -SiO 2 allow the production of ZrSiO 4 pigments for industrial applications [9].…”