A thermodynamic and photophysical study of the effects of thiourea on the micellar properties of aqueous sodium dodecyl sulphate solution
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Bibliographic record
Abstract
Abstract The micellar properties of sodium dodecyl sulphate (SDS) in aqueous thiourea solutions were investigated with the aim of studying the effect of thiourea on these properties. The critical micelle concentrations (cmc) and the degree of dissociation of the micelle were determined by the conductometric method over the temperature range 298–323 K for different concentrations of thiourea. The cmc values of the surfactant in the presence of thiourea were obtained by following the change in the relative intensities of vibrational fine structure of the pyrene fluorescence spectra. The aggregation numbers were determined by employing the static quenching fluorescence method. The cmc values in the presence of varying electrolyte concentrations (NaCl) were obtained with 8-anilinonaphthalene 1-sulphonate (ANS) as a fluorescence probe, and from these values the degree of dissociation was calculated. The mass action model was applied in the present study to obtain various thermodynamic parameters of micellization. All these properties were compared with the micellar properties of an aqueous urea/SDS system, and it was found that thiourea is a better demicellization agent.
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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) | 0.000 | 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 it