Examining the Self-Assembly of Microporous Material AlPO<sub>4</sub>-11 by Dry-Gel Conversion
Bibliographic record
Abstract
Crystallization of a representative aluminophosphate microporous material, namely AlPO 4 -11 with AEL structure, has been investigated by dry-gel conversion (DGC) including steam-assisted conversion (SAC) and vapor-phase transport (VPT). The crystallization under SAC and VPT conditions appears to follow the same pathway: the initial amorphous material is converted to a semicrystalline intermediate, which transforms into AlPO 4 -11. The semicrystalline intermediate appears to have a three-dimensional structure that bears some similarity to AEL structure. Raman spectrum suggests that it contains the 10-ring channel. XRD patterns indicate that the structure seems to be only ordered in the layer associated with the unit cell ab plane of AlPO 4 -11. The layers are stacked together via H-bonding and van der Waals interactions. However, the layers are not perfectly aligned as they are in the AEL structure, resulting in disordering along the 10-ring channel direction. Quantitative 31 P MAS NMR spectra confirm the amorphous to semicrystalline to AEL phase transition sequence. Since the semicrystalline phase is held together by weak intermolecular interactions, washing with water results in the conversion back to amorphous phase. The weak bonding forces in the semicrystalline phase are important, because they provide flexibility for reorganization of local bonding environment to form a three-dimensional covalent AEL framework. The VPT study provides unambiguous evidence that the formation of the semicrystalline phase is under the direction of di- n -propylamine.
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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".