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题名: Investigation of the interfacial water structure on poly[2-(dimethylamino)ethyl methacrylate] at the air/water interface by sum frequency generation vibrational spectroscopy
作者: Wu Dan2;  Guo Yuan1;  Liu GuangMing3;  Zhang GuangZhao3
关键词: pH ;  hydrogen bonding ;  PDEM ;  interface ;  SFG-VS
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2012-03-01
DOI: 10.1007/s11434-011-4963-4
卷: 57, 期:9, 页:984-991
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
英文摘要: The effect of pH on the conformation of surface alkyl groups and the structure of interfacial water molecules on poly[2-(dimethylamino)ethyl methacrylate] (PDEM) at the air/water interface were investigated with sum frequency generation vibrational spectroscopy (SFG-VS). At pH 4.1, the hydrogen bonding SFG spectra were similar to that of the air/pure water interface. As the pH increased from 5.4 to 9.6, the SFG intensities of both highly ordered hydrogen bonding (3200 cm(-1) band) and less-ordered hydrogen bonding (3400 cm(-1) band) were enhanced because of the charge-induced effect of deprotonated PDEM. The free OH peak disappeared completely because it was replaced by interfacial PDEM molecules. At pH 11.5, a new spectral band appeared at about 3580 cm(-1) in the ppp and sps spectra, and this could be assigned to the C (2v) asymmetric stretching mode of the water molecules through molecular symmetry simulation. These hydrogen bonding structures are fully consistent with the conformational change of PDEM alkyl groups, and PDEM molecules act as a Hofmeister solvent. PDEM molecules are kosmotropic when they are charged and become more chaotropic as the pH increases.
关键词[WOS]: CH STRETCHING MODES ;  METHYLENE ;  SURFACES ;  MOLECULES ;  HYDRATION ;  POLYMER
语种: 英语
WOS记录号: WOS:000301441800005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143078
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, State Key Lab Mol React Dynam, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China

Recommended Citation:
Wu Dan,Guo Yuan,Liu GuangMing,et al. Investigation of the interfacial water structure on poly[2-(dimethylamino)ethyl methacrylate] at the air/water interface by sum frequency generation vibrational spectroscopy[J]. CHINESE SCIENCE BULLETIN,2012,57(9):984-991.
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