Interaction of water with oligo(ethylene glycol) terminated monolayers: wetting versus hydration.

Interaction of water with oligo(ethylene glycol) terminated monolayers: wetting versus hydration.
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水与寡聚乙二醇封端单分子层的相互作用:润湿与水合

DOI:
10.1039/d0cp00906g
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发表时间:
2020
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
Michael
Michael
中科院分区:
--
文献类型:
--
作者:
Mustafa;Nefedov;Alexei;Zharnikov;Michael

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低聚乙二醇(OEG)取代的自组装单分子膜(SAMs),作为类似的聚合物表面的模型系统,生物排斥性通常归因于水合作用。在这种情况下,我们应用程序升温脱附研究水(D2 O)与一系列OH-封端的,OEG-取代的烷基硫醇盐自组装膜的OEG链的可变长度的相互作用,定义其生物降解行为。沿着冰覆盖层(润湿相),也在类似的非取代膜的表面上生长,观察到对应于D2 O吸附到OEG基质中的水合相,具有更高的解吸能(12.4 kcal mol− 1 vs. 10.4 kcal mol-1)和与OEG链的长度相关并因此与生物脉动性相关的重量。水合相的形成被发现发生在活化屏障上,推测是通过温度促进的从润湿相的扩散,该过程另外通过预解吸退火来强制执行。
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.
低聚(乙二醇)取代的烷硫醇自组装单分子层上水吸附和解吸的光谱研究
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