Aerosol Particle Diffusivity in the Free Molecule Regime
Bibliographic record
Abstract
> 10), characteristic for this regime. However, such efforts miss the atomic level interactions between aerosol particles and surrounding gas molecules. Such interactions are dominant at the low end of the nanoscale. Here, diffusion coefficients of tiny (from 0.4 to about 7 nm in diameter) fullerene and silica particles in air are obtained by molecular dynamics (MD) simulations wherein both particles and gas molecules are considered in their full atomistic representation (force field and shape). Below 3 nm, these MD-derived diffusivities are in excellent agreement with an experimentally based equation for gas diffusivities but show systematic deviations from the classic Epstein and Stokes-Cunningham-Millikan (SCM) equations for particle diffusivity. These deviations become most pronounced as the NP size approaches that of gas molecules. Above 5 nm, the MD-derived diffusivities nicely converge to these equations. These diffusivities are compared also to other literature equations for particle diffusivity in this size regime at ambient conditions.
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How this classification was reachedexpand
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".