Smudge-resistant antimicrobial ladder-like polysilsesquioxane coatings
Bibliographic record
Abstract
The photocuring of 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane-based ladder-like polysilsesquioxane (L) with poly(dimethyl siloxane) (PDMS) side chains results in an exceptionally hard, highly wear-resistant anti-smudge coating. In this study, we developed bi-functional L coatings with both anti-smudge and antimicrobial properties. The process begins with the synthesis of graft copolymers , P(A-1k) or P(A-5k), through free radical copolymerization of 2-(dimethylamino)ethyl methacrylate (A) and methacrylate-terminated PDMS of either 1.0 kDa (1k) or 5.0 kDa (5k), using 4,4-azobis(4-cyanovaleric acid) as the initiator. Due to chain termination by disproportionation , the resulting P(A-1k) and P(A-5k) primarily contain one terminal carboxyl group per chain. These terminal groups react with excess L through epoxide ring opening, producing L-P(A-1k) and L-P(A-5k), which consist mainly of L and small amounts of double graft ( g ) copolymers , L- g -P(A-1k) and L- g -P(A-5k), respectively (for a more thorough clarification of the notations see List of Polymer Abbreviations at the end of the paper). Casting a solution of L-P(A-1k) or L-P(A-5k) with a cationic photoinitiator and additional L (to fine-tune the coating composition) forms films enriched with P(A-1k) or P(A-5k) on the surface due to the low surface energies of 1k or 5k. After curing these films via UV irradiation and heating, the surface A groups are converted to quaternary ammonium salts through treatment with methyl iodide or propyl iodide. The resulting coatings exhibit anti-smudge properties in air, attributed to the exposed 1k or 5k chains. When in contact with water droplets containing E. coli , the surfaces undergo reconstruction, exposing the quaternary ammonium salts , which effectively kill the bacteria. This study investigates the factors affecting the formation of the coatings, their smudge repellency , surface reconstruction, and antimicrobial efficacy .
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".