Ionic strength dependent forces between end-grafted Poly(sulfobetaine) films and mica
| Autor: | Jason J. Madinya, Syeda Tajin Ahmed, Deborah E. Leckband |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Materials science Osmolar Concentration Surface force Ionic bonding Surface forces apparatus Polymer Methacrylate Surfaces Coatings and Films Electronic Optical and Magnetic Materials Betaine Biomaterials Colloid Colloid and Surface Chemistry Chemical engineering chemistry Ionic strength Excluded volume Methacrylates Aluminum Silicates |
| Zdroj: | Journal of Colloid and Interface Science. 606:298-306 |
| ISSN: | 0021-9797 |
| Popis: | The molecular surface properties of zwitterionic polymer coatings are central to their ultra-low fouling properties and effectiveness as steric stabilizers in concentrated salt solutions. Here, Surface Force Apparatus measurements quantified the molecular forces between end-grafted poly(sulfobetaine) methacrylate thin films and mica, as a function of the chain grafting density and ionic strength. These results demonstrate that, at the ionic strengths considered, end-grafted poly(sulfobetaine) films can be described by models for polymers in good solvent. Parameters determined from data fits to the Milner-Witten-Cates or Dolan and Edwards models for dense or dilute chains, respectively, varied with ionic strength, in ways that reflect poly(sulfobetaine) swelling and the increased excluded volume strength of chain segments. These force measurements provide new insight into how polymer coverage and salt cooperate to regulate repulsive poly(sulfobetaine) steric barriers. These findings have implications for the design of grafted poly(sulfobetaine) as colloidal stabilizers or nonfouling surface coatings. |
| Databáze: | OpenAIRE |
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