Interaction of water with oligo(ethylene glycol) terminated monolayers: wetting versus hydration
Biorepulsivity of oligo(ethylene glycol) (OEG) substituted self-assembled monolayers (SAMs), serving as model systems for analogous polymeric surfaces, is generally ascribed to the hydration effect. In this context, we applied temperature-programmed desorption to study interaction of water (D2O) wit...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
27 Mar 2020
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| In: |
Physical chemistry, chemical physics
Year: 2020, Volume: 22, Issue: 15, Pages: 8088-8095 |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/D0CP00906G |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1039/D0CP00906G Verlag, lizenzpflichtig, Volltext: https://pubs.rsc.org/en/content/articlelanding/2020/cp/d0cp00906g 
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| Author Notes: | Mustafa Sayin, Alexei Nefedov and Michael Zharnikov |
| Summary: | Biorepulsivity of oligo(ethylene glycol) (OEG) substituted self-assembled monolayers (SAMs), serving as model systems for analogous polymeric surfaces, is generally ascribed to the hydration effect. In this context, we applied temperature-programmed desorption to study interaction of water (D2O) with a series of OH-terminated, OEG-substituted alkanethiolate SAMs with variable length of the OEG strand, defining their biorepulsion behavior. Along with the ice overlayer (wetting phase), growing also on the surface of the analogous non-substituted films, a hydration phase, corresponding to the adsorption of D2O into the OEG matrix, was observed, with a higher desorption energy (12.4 kcal mol−1vs. 10.4 kcal mol−1) and a weight correlating with the length of the OEG strand and, consequently, with biorepulsivity. The formation of hydration phase was found to occur over an activation barrier, presumably by temperature-promoted diffusion from the wetting phase, with this process being additionally enforced by a pre-desorption annealing. |
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| Item Description: | Gesehen am 02.06.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/D0CP00906G |