Gelation and long-time relaxation of aqueous solutions of Pluronic F127
Bibliographic record
Abstract
We have studied the gelation dynamics of solutions of Pluronic F127, a triblock copolymer, using oscillatory rheometry. As the solutions are slowly heated from 10 to 85°C, they undergo a transition from sol to gel around room temperature, followed by a gel-sol transition at a higher temperature. The sol-gel transition temperature decreases and the width in the temperature of the gel phase broadens with increasing concentration. The reverse transitions occur on cooling. Both transitions are hysteretic, and the temperature range over which the transitions occur is different on cooling than on heating. Near the phase transitions, the rheological relaxation time becomes very long, up to of order τs∼104s. Gelation in Pluronic solutions is due to the arrangement of micelles into an organized large-scale structure, and our results suggest that the rearrangement of micelles into or out of the gel structure is a slow process at temperatures within the phase transitions.
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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 | 0.001 |
| 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".