Self-Aggregation of Alkyl (C<sub>10</sub>-, C<sub>12</sub>-, C<sub>14</sub>-, and C<sub>16</sub>-) Triphenyl Phosphonium Bromides and Their 1:1 Molar Mixtures in Aqueous Medium: A Thermodynamic Study
Why this work is in the frame
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Bibliographic record
Abstract
The self-aggregation of alkyl (C 10 -, C 12 -, C 14 -, and C 16 -) triphenyl phosphonium bromide surfactants (ATPBs) and their equimolar binary mixtures in aqueous medium was studied microcalorimetrically and conductometrically at different temperatures. The thermograms of C 10 - and C 12 TPB have shown differences in behavior from those of C 14 - and C 16 TPB. Their binary (1:1 mol/mol) mixtures with C 10 - or C 12 TPB as one of the components have also evidenced differences in behavior. Individually as well as in mixed conditions, the ATPBs have indicated formation of two states of aggregation corroborated by both calorimetric and conductometric measurements. On the basis of the results, the thermodynamic parameters, free energy (Δ G m °), enthalpy (Δ H m °), entropy (Δ S m °), and specific heat (Δ C p m °), of micellization have been evaluated. The specific heat has been found to vary linearly with the carbon number in the ATPB chain. The Δ H m ° and Δ S m ° values for the micellization of the pure ATPBs have nicely compensated each other. The free energy of transfer of a mole of CH 2 from an aqueous environment to a micelle was found to be −2.0 kJ mol -1 .
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| 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 | 0.001 | 0.002 |
| 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