A Comprehensive Study of Titanium-Substituted SBA-15 Mesoporous Materials Prepared by Direct Synthesis
Bibliographic record
Abstract
The influence of different synthesis parameters on the physicochemical properties of titanium-substituted SBA-15 silicas prepared by direct one-step synthesis was systematically studied by a combination of N 2 physisorption at −196 °C, X-ray diffraction (XRD), diffuse reflectance UV−vis, and elemental analysis. The results showed that for low titanium precursor concentrations used in the initial synthesis gel, incorporation of titanium in the final material is not complete. Under these synthesis conditions, Ti atoms are well-dispersed in the silica framework and mainly exist in tetrahedral coordination. When the isolated titanium species present in the gel reach a critical concentration, an increase in incorporation ratio is observed due to the formation of anatase TiO 2 clusters on the materials surface. It was also shown that this critical titanium loading is mainly influenced by synthesis temperature, hydrothermal treatment time, and silicon precursor concentration and does not depend on acid concentration. Moreover, it was shown that when the formation of anatase TiO 2 takes place, the amorphous titanium species dispersed into the silica materials are resolubilized in the acidic solution increasing the fraction of bulk anatase into the mesoporous silica.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".