Heterogeneous photodegradation of tannic acid studied by diffuse reflectance FTIR (DRIFTS)
Bibliographic record
Abstract
Little is known about the mechanism and kinetics of the photodegradation of humic like substances (HULIS) in atmospheric aerosols. Using tannic acid as a mimic for HULIS, we investigated (1) the structure of adsorbed water before and after photodegradation, (2) the mechanism and kinetics of the photodegradation of tannic acid, (3) the change in hydrophilicity of tannic acid as a result of this photochemistry, and (4) the role of NaNO2 as an external oxidant. We found that the structure of water adsorbed on tannic acid resembles that of water at the interface with polar organic solvents. The rate of tannic acid photodegradation depends more on light intensity than on humidity. No enhancement in water uptake after photodegradation was observed. External photooxidation by NaNO2 resulted in the formation of surface organonitrogen compounds. The implications of our results are discussed in relation to the aging of HULIS and their activation as cloud condensation nuclei.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".