Interaction of water with oligo(ethylene glycol) terminated monolayers: wetting versus hydration,Physical Chemistry Chemical Physics

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Interaction of water with oligo(ethylene glycol) terminated monolayers: wetting versus hydration
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020/03/27 , DOI: 10.1039/d0cp00906g
Mustafa Sayin _{1,

2,

3,

4} , Alexei Nefedov _{4,

5,

6,

7} , Michael Zharnikov _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

水与低聚乙二醇末端单层的相互作用：润湿与水合

用作类似聚合物表面模型系统的低聚乙二醇（OEG）取代的自组装单分子层（SAMs）的生物排斥性通常归因于其水合作用。在这种情况下，我们应用程序升温脱附来研究水（D ₂ O）与一系列OH末端，OEG取代的链烷硫醇盐SAM的相互作用，其中OEG链的长度可变，从而定义了它们的生物排斥行为。伴随着冰覆层（润湿相），在类似的非取代膜表面也生长，观察到水合相，对应于D ₂ O吸附在OEG基质中，具有较高的解吸能（12.4） kcal mol ^-1与10.4 kcal mol ^-1）和与OEG链的长度相关的重量，因此与生物排斥性相关。发现水合相的形成发生在活化屏障上，这大概是由于温度促进了从润湿相的扩散，而该过程还通过预解吸退火来强制实施。

更新日期：2020-04-15

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