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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2510.24716 |
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| _version_ | 1866909874052399104 |
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| author | Schubotz, Simon Bittrich, Eva Merlitz, Holger Besford, Quinn A. Uhlmann, Petra Sommer, Jens-Uwe Auernhammer, Günter K. |
| author_facet | Schubotz, Simon Bittrich, Eva Merlitz, Holger Besford, Quinn A. Uhlmann, Petra Sommer, Jens-Uwe Auernhammer, Günter K. |
| contents | We resolve the Schröder paradox for PNiPAAm brushes, showing experimentally that swelling at 100\% relative humidity (RH) matches the liquid state. This occurs via a sharp increase in swelling above 98\%~RH, a behavior standard models fail to explain. Our extended mean-field theory explains this via a positive feedback between swelling and solvent quality, driven by a concentration-dependent $χ$ parameter. The swelling isotherm quantitatively predicts the dynamic wetting crossover: the advancing contact angle at high velocities drops sharply as ambient humidity surpasses the 98\%~RH threshold. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_24716 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Positive Feedback Drives Sharp Swelling of Polymer Brushes near Saturation Schubotz, Simon Bittrich, Eva Merlitz, Holger Besford, Quinn A. Uhlmann, Petra Sommer, Jens-Uwe Auernhammer, Günter K. Soft Condensed Matter We resolve the Schröder paradox for PNiPAAm brushes, showing experimentally that swelling at 100\% relative humidity (RH) matches the liquid state. This occurs via a sharp increase in swelling above 98\%~RH, a behavior standard models fail to explain. Our extended mean-field theory explains this via a positive feedback between swelling and solvent quality, driven by a concentration-dependent $χ$ parameter. The swelling isotherm quantitatively predicts the dynamic wetting crossover: the advancing contact angle at high velocities drops sharply as ambient humidity surpasses the 98\%~RH threshold. |
| title | Positive Feedback Drives Sharp Swelling of Polymer Brushes near Saturation |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2510.24716 |