Comparative molecular characterization of aluminum hydroxy‐gels derived from chloride and sulphate salts
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Bibliographic record
Abstract
Abstract Background Aluminum ( III ) hydroxy‐gels find important applications in areas such as paint pigments, pharmaceuticals and water treatment or toxic metal sequestration. Since the method of preparation may affect their properties and performance, in this work we prepare aluminum hydroxy‐gels from either chloride or sulphate salts and subject them to comparative characterization. Results Aluminum ( III ) hydroxy‐gels were produced by partial quick neutralization of 2 mol L −1 AlCl 3 or Al( SO 4 ) 1.5 salt solutions with 5 N NaOH at room temperature. The gels were found, following ageing and water washing, to consist of 60–70 wt% Al( OH ) 3 , 5–18 wt% Cl or SO 4 and ∼20 wt% water. Both gel materials upon drying were seen to be highly porous formed from aggregates of very fine particles nucleated during the fast neutralization process. The Al( SO 4 ) 1.5 ‐derived gel was found to differ significantly from the AlCl 3 ‐derived gel both in terms of surface area (38 m 2 g −1 vs. 18 m 2 g −1 ) and chemical features. The aluminum chloride gel material is probably composed of chains of aluminum octahedra (Al n ( OH ) 2. 5 Cl 0 .5n ( H 2 O ) 3n ) while the aluminum sulphate gel of SO 4 ‐stabilized Keggin Al 13 structure: AlO 4 Al 12 ( OH ) 24 ( SO 4 ) 3.5 ( H 2 O ) 12 . Conclusion The distinct molecular structure of the aluminum sulphate‐derived gel may provide an effective matrix for hazardous metal containment. © 2013 Society of Chemical Industry
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 it