Synthesis of Porous Organosilicates in the Presence of Alkytrimethylammonium Chlorides: Effect of the Alkyl Chain Length
Bibliographic record
Abstract
A series of organosilicates were prepared using 1,2-bis(trimethoxysilyl)ethane (BTME) as silica precursor and alkyltrimethylammonium chloride (CnTMACl) surfactants with different chain lengths (n = 8, 10, 12, 14, 16, 18) as supramolecular templating materials. 13C and 29Si NMR data showed that after surfactant extraction, all samples consisted of pure organosilicate. Additional characterization techniques, that is, XRD, N2 adsorption, and SEM, were also used to gain insights into the structure, porosity, and morphology of the materials. These properties were found to be strongly dependent on the surfactant chain length and the preparation conditions. Materials prepared in the presence of surfactants with the shortest carbon chains were microporous akin to amorphous organosilicate xerogels. However, in the presence of long chain surfactants, periodic mesoporous organosilicates with narrow pore size distributions occurred. The pore sizes of such materials were found to increase with the surfactant carbon chain length. With only one exception, these materials exhibited two-dimensional hexagonal symmetry.
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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".