Photomechanical effect of azobenzene thin polymer films measured with an AFM cantilever based sensor
Bibliographic record
Abstract
Herein we present the characterization of the photomechanical effect of thin films of azobenzene based polymers PDR1A, PDR13A and PMMA-co-PDR1A using an AFM based sensor. The polymers were coated on silicon and mica cantilevers, and the cantilever bending and surface stress changes were characterized. We have shown that the photoisomerization results in fast and significant cantilever bending ranging from 50-313 μm and changes in surface stresses ranging from 96 to 568 N/m for PDR1A coated mica cantilevers. The photomechanical effect was shown to be robust and repeatable. Of all the polymers studied, PDR1A exerted the largest forces with variations in solvent presence, main chain modification and chromophore modification, all reducing the change in surface stress in order of increasing impact. The utility of this new sensor in the understanding and characterization of the photomechanical effect of azobenzene based polymers is demonstrated.
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How this classification was reachedexpand
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 | 0.001 | 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".