Sol-gel formation of silica-zirconia glasses

Palladino, Maria Teresa; Pirini, F.; Beghi, M.; Chiurlo, P.; Cogliati, G.; Costa, L.C.

doi:10.1016/s0022-3093(05)80640-4

Cited by 16 publications

(18 citation statements)

References 2 publications

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“…4A-C) did not show any degree of crystallinity, and only after they were heated at 1623 K ( Figure 4D) did a change from amorphous to crystalline phase occur. The peaks marked with a and b are due to the separate crystalline phases of SiO 2 and ZrO 2 according to the published results for known samples (15)(16)(17).…”

Section: Fig 5 Scanning Electron Microscopy Image Of Sz 3 (A); the mentioning

confidence: 96%

The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)

Alfaya

Gushikem

1999

Journal of Colloid and Interface Science

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Section: Fig 5 Scanning Electron Microscopy Image Of Sz 3 (A); the mentioning

confidence: 96%

The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)

Alfaya

Gushikem

1999

Journal of Colloid and Interface Science

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“…This study has been carried out firstly on independent Si-or Zr-containing solutions in which the reagent proportions are the same used in the preparation of the Zr-UVM-7 porous materials described in this work. In the absence of water, the majority species for both Si and Zr solutions correspond to M(TEA)- 4 ], in very low proportions (12 and 15 %, respectively). The relative intensities have been calculated without considering the peaks associated with the dissolvent.…”

Section: Synthesis Strategymentioning

confidence: 99%

“…In this way, the already studied role played by TEAH 3 in order to orchestrate the hydrolytic reactions of the Si and Zr precursor species [36] is preserved in the current synthesis of the Zr-UVM-7 solids. Finally, once the hydrolytic reactions have been completed, the total concentration of soluble silica can be accounted for by Si(OH) 4 and (HO) 3 -SiO -species in an approximate ratio of 10:1.6, [57,58] while the majority Zr species should be the Zr(OH) 5 -mono-mer. [59] The subsequent condensation processes will proceed from these monomeric entities.…”

Section: Synthesis Strategymentioning

confidence: 99%

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

et al. 2006

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Silica-based nanoparticulated bimodal mesoporous materials with high Zr content (43 Ն Si/Zr Ն 4) have been synthesized by a one-pot surfactant-assisted procedure from a hydroalcoholic medium using a cationic surfactant (CTMABr = cetyltrimethylammonium bromide) as structure-directing agent, and starting from molecular atrane complexes of Zr and Si as hydrolytic inorganic precursors. This preparative technique allows optimization of the dispersion of the Zr guest species in the silica walls. The bimodal mesoporous nature of the final high surface area nano-sized materials is confirmed by XRD, TEM, and N 2 adsorption-desorption isotherms. The small intraparticle mesopore system (with pore sizes around 2-3 nm) is due to the supramolecular templating effect of the surfactant, while the large mesopores (around 12-24 nm) have their

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“…ZrO2-containing silicates are materials with important technological applications due to their high fracture toughness, excellent chemical resistance to alkaline attack and low thermal expansion (Garvie, Hannik & Pascoe, 1975;Paul, 1982;Nogami & Tomozawa, 1986;Palladino, Pirini, Beghi, Chiurlo, Cogliati & Costa, 1992). However, the production of these materials by the conventional solid-state reaction route is difficult since rather high temperatures are necessary for the reaction to be fully completed.…”

Section: Introductionmentioning

confidence: 99%

Structure of ZrO₂SiO₂ Gels

Stachs¹,

Petkov²,

Gerber³

1997

J Appl Cryst

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AbstractxZrO2(l -x)SiO2 gels have been prepared by hydrolytic polycondensation of tetraethylorthosilicate and zirconium n-propoxide in alcohol solution (x-0.1-0.5). The formation of the gels has been investigated in situ by conventional small-angle X-ray scattering. (SAXS) experiments. Primary particles of size 1-2 nm have been found in all hydrogels at the first stage of the gelation process. With further progress of the gelation, the primary particles have been found to aggregate into secondary clusters with fractal characteristics. It has also been observed that the higher the Zr concentration in the sol the faster the rate of aggregation of the primary particles. Anomalous small-angle X-ray scattering (ASAXS) and wide-angle X-ray scattering (WAXS) experiments have also been carried out on samples of ZrOz-SiO2 xerogels that have been dried only and samples that have been further heat-treated at various temperatures. The ASAXS experiments have shown that the xerogels obtained without manipulating the aggregation rate do not exhibit microinhomogeneities even when heated up to 800 K. Reverse Monte Carlo simulations based on the experimental wide-angle diffraction data have also been carried out. In line with the findings of the ASAXS experiments, the simulations have suggested that Zr and Si atomic species in the ZrOz-SiO2 xerogels investigated are homogeneously distributed at the atomic scale. The first traces of a phase segregation into Si-and Zr-rich phases, as demonstrated by the emergence of tetragonal ZrO2, were detected only after prolonged heat treatment at 1100 K.

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Sol-gel formation of silica-zirconia glasses

Cited by 16 publications

References 2 publications

The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)

The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

Structure of ZrO₂SiO₂ Gels

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Sol-gel formation of silica-zirconia glasses

Cited by 16 publications

References 2 publications

The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)

The Preparation and Application of Silica–Zirconia Xerogel as Potentiometric Sensor for Chromium(VI)

High‐Zirconium‐Content Nano‐Sized Bimodal Mesoporous Silicas

Structure of ZrO2SiO2 Gels

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Structure of ZrO₂SiO₂ Gels