Modulation of Electroosmotic Flow Strength with End-Grafted Polymer Chains
Bibliographic record
Abstract
We report on coarse-grained molecular dynamics simulations of the electroosmotic flow (EOF) of an electrolyte confined in a cylindrical, nanoscopic pore. We present results for the equilibrium distribution of fluid particles and ions in the electrolyte, and we show that our computational model reproduces the well-known characteristics of EOF in the steady-state regime, in particular the well-known pluglike character of this type of flow when the Debye length is small compared to the characteristic channel size. Upon adding a number of neutral, grafted polymer chains on the interior capillary surface, we find a significant reduction of the magnitude of the EOF. We characterize the polymer coatings and further show that the observed reduction in flow strength, as a function of polymer surface coverage, is in quantitative agreement with recent theoretical scaling predictions regarding the coupling of EOF and polymer coatings in small Debye length systems. As far as we know, our results constitute the first independent, quantitative verification of these predictions.
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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 | 0.001 |
| 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 | 0.001 |
| 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".