Energy Transfer Study of the Cylindrical Interface Formed by Asymmetric Isoprene−Methyl Methacrylate Diblock Copolymers Bearing a Dye at the Junction
Bibliographic record
Abstract
The experiments described here were designed to determine the characteristic width δ of the cylindrical interface in a block copolymer that forms a hexagonal phase in the bulk state. We used fluorescence resonance energy transfer (FRET) to study films consisting of mixtures of donor- and acceptor-labeled poly(isoprene- b -methyl methacrylate) (PI−PMMA, 29 vol % PI). Dye labels were attached at the PI−PMMA junctions. Because the dyes are connected to the junctions, they are confined to the block copolymer interface. To obtain information about the width of the interface separating the components, we compared measured and simulated donor fluorescence decay profiles. We developed a Monte Carlo method to introduce donor and acceptor sites within the interface and then used this dye distribution to calculate simulated “experimental” decay profiles. In this way we were able to examine the appropriateness of using a preaveraged value of the orientation parameter in evaluating FRET data. We found that a value of 〈|κ|〉 2 = 0.40 gave a reasonable agreement with results obtained by considering random orientation of dipoles for each donor−acceptor pair. Through these experiments, we found a value of δ slightly smaller than 1.0 nm, confirming that PI and PMMA are very meagerly miscible polymers.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".