The effect of perfluorotetradecanoic acid on the structure of photopolymerized 10,12-pentacosadiynoic acid films at the air–water interface
Bibliographic record
Abstract
The influence of the perfluorinated fatty acid perfluorotetradecanoic acid (CF3(CF2)12COOH; PF) on the structure of films of the photopolymerizable surfactant 10,12-pentacosadiynoic acid (PCDA) has been explored at the air–water interface through a combination of surface pressure–area compression measurements and Brewster angle microscopy imaging during the time course of UV photopolymerization. The addition of the perfluorocarbon to PCDA results in a film structure that differs significantly from the pure PCDA alone, with the most pronounced difference being the formation of photopolymer strands oriented perpendicular to the direction of film compression in a Langmuir trough. Film compression data, supported by in situ fluorescence spectrophotometry and atomic force microscope images of deposited films, suggest that compression-induced stress and accompanying film buckling, enhanced by the strong cohesion between PF and PCDA, contributes to the observed structural differences between the mixed PF–PCDA and pure PCDA photopolymerized films. This approach to forming patterned polydiacetylene films is discussed in comparison with other demonstrated methods for structuring this technologically important polymer.
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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".