Specific Cation Effects\non the Bimodal Acid–Base\nBehavior of the Silica/Water Interface
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Bibliographic record
Abstract
Using nonresonant second harmonic generation spectroscopy,\nwe have\nmonitored the change in surface charge density of the silica/water\ninterface over a broad pH range in the presence of different alkali\nchlorides. Planar silica is known to possess two types of surface\nsites with p<i>K</i><sub>a</sub> values of ∼4 and\n∼9, which are attributed to different solvation environments\nof the silanols. We report that varying the alkali chloride electrolyte\nsignificantly changes the effective acid dissociation constant (p<i>K</i><sub>a</sub><sup>eff</sup>) for the less acidic silanol\ngroups, with the silica/NaCl<sub>aq</sub> and silica/CsCl<sub>aq</sub> interfaces exhibiting the lowest and highest p<i>K</i><sub>a</sub><sup>eff</sup> values of 8.3(1) and 10.8(1), respectively.\nAdditionally, the relative populations of the two silanol groups are\nalso very sensitive to the electrolyte identity. The greatest percentage\nof acidic silanol groups was 60(2)% for the silica/LiCl<sub>aq</sub> interface in contrast to the lowest value of 20(2)% for the silica/NaCl<sub>aq</sub> interface. We attribute these changes in the bimodal behavior\nto the influence of alkali ions on the interfacial water structure\nand its corresponding effect on surface acidity.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.011 | 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 it