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Structural characterization of titanium-oxo-polymers synthesized in the presence of protons or complexing ligands as inhibitors
Structural characterization of titanium-oxo-polymers synthesized in the presence of protons or complexing ligands as inhibitors
- Source :
- Journal of Non-Crystalline Solids, Journal of Non-Crystalline Solids, Elsevier, 2000, 265 (1-2), pp.83-97. ⟨10.1016/S0022-3093(99)00885-6⟩, Journal of Non-Crystalline Solids, 2000, 265 (1-2), pp.83-97. ⟨10.1016/S0022-3093(99)00885-6⟩
- Publication Year :
- 2000
- Publisher :
- HAL CCSD, 2000.
-
Abstract
- The structure of sol–gel synthesized titanium oxo-polymers has been investigated using solid and liquid state 17O NMR and small angle X-ray scattering (SAXS). The growth of the titanium oxo-polymers has been controlled to produce sols and gels by adjusting two main parameters: the hydrolysis ratio H=[H2O]/[Ti] and the inhibitor ratio p=[H+]/[Ti] or a=[ acacH ]/[ Ti ] ( acacH = acetylacetone ) . The combination of 17O NMR and SAXS techniques has allowed us to determine the structure of the oxo-polymers at a local and a semi local scale. The proposed model for the structure of these oxo-polymers is based on the condensation of sub-units with a mean composition Ti(OZ)x(OH)yO2 − (x + y)/2 (OZ=Acac+OBun) and having a gyration radius of about 20–25 A. These sub-units are made with a titanium-oxo core built with μ2-O, μ3-O, μ4-O bridges and their surface is capped by the residual ligands OZ. Increasing the hydrolysis ratio H or decreasing the inhibitor ratio (p or a), mainly results in an increase of the size and the fractal dimension of the oxo-polymers, while the size and the mean composition of titanium oxo-core constituting the sub-units are apparently not modified.
- Subjects :
- Acetylacetone
Analytical chemistry
chemistry.chemical_element
02 engineering and technology
[CHIM.INOR]Chemical Sciences/Inorganic chemistry
010402 general chemistry
01 natural sciences
chemistry.chemical_compound
Hydrolysis
Materials Chemistry
ComputingMilieux_MISCELLANEOUS
Sol-gel
chemistry.chemical_classification
Small-angle X-ray scattering
Scattering
Condensation
Polymer
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Electronic, Optical and Magnetic Materials
chemistry
Ceramics and Composites
Physical chemistry
0210 nano-technology
Titanium
Subjects
Details
- Language :
- English
- ISSN :
- 00223093
- Database :
- OpenAIRE
- Journal :
- Journal of Non-Crystalline Solids, Journal of Non-Crystalline Solids, Elsevier, 2000, 265 (1-2), pp.83-97. ⟨10.1016/S0022-3093(99)00885-6⟩, Journal of Non-Crystalline Solids, 2000, 265 (1-2), pp.83-97. ⟨10.1016/S0022-3093(99)00885-6⟩
- Accession number :
- edsair.doi.dedup.....c31c2988364c854ac38911613f589f60
- Full Text :
- https://doi.org/10.1016/S0022-3093(99)00885-6⟩