Hydration of Hexafluoroacetone on Ice
Bibliographic record
Abstract
We unravel the fate of hexafluoroacetone (HFA), a PFAS degradation product, on ice by combining surface science and DFT. Temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) experimentally show that HFA diffuses into the ice film and readily and completely reacts to form the diol (1,1,1,3,3,3-hexafluoropropane-2,2-diol). Desorption energies were measured for HFA from the underlying substrate (Pt(111)) for the desorption of the ice film and for the diol as 44, 52, and 62 kJ/mol, respectively. Calculations show that the formation of the diol is favorable on the ice surface by at least 29 kJ/mol. This study is fundamental to better understand the reactivity of HFA on ice in atmospheric conditions since it clearly demonstrates that the diol will dominate reactivity with ice in the environment.
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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) | 0.002 | 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".