Interactions\nbetween Hydrophobically Modified Alkali-Swellable\nEmulsion Polymers and Sodium Dodecyl Sulfate Probed by Fluorescence\nand Rheology
Bibliographic record
Abstract
The\ninteractions between a pyrene-labeled hydrophobically modified\nalkali-swellable emulsion (Py-HASE) polymer and the anionic surfactant\nsodium dodecyl sulfate (SDS) in aqueous solution were investigated\nwith a fluorometer, a rheometer, and a combination of both instruments\nto probe the fluorescence of the polymer while the solution was being\nsheared. Different amounts of SDS were added to two solutions with\nPy-HASE concentrations of 8 and 57 g/L. The pyrene monomer and excimer\ndecays of the Py-HASE solutions were acquired and globally fitted\naccording to the fluorescence blob model (FBM) and the model free\n(MF) analysis. Both models yielded the same molar fractions of pyrenes\nthat were isolated, aggregated, or forming excimer by diffusion. The\naverage number of pyrenes per micelle, ⟨<i>n</i>⟩,\nwas determined according to the FBM and found to equal 2.0 at the\nSDS concentration corresponding to a maximum in solution viscosity.\nFor a Py-HASE concentration of 57 g/L, the solution viscosities at\ndifferent SDS concentrations were measured from the Newtonian plateau\nregions and were found to peak at an SDS concentration of 11 mM. The\nsteady-state fluorescence spectra were acquired at SDS concentrations\nof 0.1, 6.0, 11.1, and 17 mM while the 57 g/L Py-HASE solution was\nsheared. Although the solutions of Py-HASE and SDS were found to shear-thin\nsubstantially with the solution viscosity decreasing by up to 4 orders\nof magnitude, no change was observed in the fluorescence spectra acquired\nat shear rates ranging from 0.005 to 500 s<sup>–1</sup>. The\noverlap of the fluorescence spectra under conditions where the solution\nviscosity decreased by 4 orders of magnitude suggested that the rearrangement\nof the hydrophobes from inter- to intramolecular associations that\nleads to shear-thinning occurs on a time scale that is much faster\nthan that over which the rheology experiments are being conducted.
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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 | 0.000 |
| 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) | 0.124 | 0.001 |
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".