Intrazeolite Photochemistry. 26. Photophysical Properties of Nanosized TiO<sub>2</sub> Clusters Included in Zeolites Y, β, and Mordenite
Bibliographic record
Abstract
The photophysical properties of TiO 2 included in zeolites Y, β, and mordenite are determined using time-resolved techniques. The shift in the ground-state absorption spectra for the TiO 2 −zeolite samples, compared to bulk phase anatase, is attributed to a direct transition in the semiconductor, based on calculated electronic transition energies. Excitation of the samples at 355 nm results in the formation of a trapped electron. Time-resolved fluorescence spectra are dependent upon the sample treatment, that is, whether the sample is heated prior to monitoring of the emission. Significant changes were found in the emission λ max and decay kinetics. These changes that occur are due to the presence of two different Ti species in the nanoclusters, differing in the presence of hydroxyl groups bonded to Ti atoms, that in turn depends on the thermal treatment and the relocation/redistribution of water around the Ti atoms. Changes in relative intensities between the two sets of samples are attributed to defect sites that are produced upon heating of the sample at high temperatures.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 source (direct Gemma or distilled Codex), 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".