In Situ Probing of the Surface Hydration of Zwitterionic Polymer Brushes: Structural and Environmental Effects

被引:129
|
作者
Leng, Chuan [1 ]
Han, Xiaofeng [1 ]
Shao, Qing [2 ]
Zhu, Yongheng [2 ]
Li, Yuting [2 ]
Jiang, Shaoyi [2 ]
Chen, Zhan [1 ]
机构
[1] Univ Michigan, Dept Chem, Ann Arbor, MI 48109 USA
[2] Univ Washington, Dept Chem Engn, Seattle, WA 98195 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2014年 / 118卷 / 29期
关键词
SUM-FREQUENCY-GENERATION; INTERFACIAL WATER-STRUCTURE; VIBRATIONAL SPECTROSCOPY; PROTEIN ADSORPTION; ORIENTATION; BEHAVIORS; BETAINES; COATINGS; BINDING; DESIGN;
D O I
10.1021/jp504293r
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surface hydration has been proposed as the key nonfouling mechanism of zwitterionic materials. Because these materials have various chemical structures and will be used in complex environments, in situ probing of their surfaces in different aqueous environments is crucial to understanding their surface hydration properties. In this work, the surfaces of three zwitterionic polymer brushes in aqueous solutions with salts or varied pH were probed using sum frequency generation (SFG) vibrational spectroscopy. The SFG spectra indicate the ordering of the polymer brushes in water and the strong hydrogen bonding of the interfacial water molecules. The ordering of water at the surfaces of carboxybetaine polymers changed with pH, but at the sulfobetaine polymer surface, this ordering was not affected by pH. The interfacial ordering of water also decreased when salt ions were associated with the polymers. Ions from different salts had different interfacial binding affinities depending on the ion type and the polymer structure, as deduced from the interfacial water signals. These SFG results reveal important surface hydration properties of zwitterionic polymers that will guide their applications in complex environments.
引用
收藏
页码:15840 / 15845
页数:6
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