In situ probing of the surface hydration of zwitterionic polymer brushes: Structural and environmental effects

Chuan Leng, Xiaofeng Han, Qing Shao, Yongheng Zhu, Yuting Li, Shaoyi Jiang, Zhan Chen

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)15840-15845
Number of pages6
JournalJournal of Physical Chemistry C
Volume118
Issue number29
DOIs
StatePublished - Jul 24 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'In situ probing of the surface hydration of zwitterionic polymer brushes: Structural and environmental effects'. Together they form a unique fingerprint.

Cite this