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题名: Vibrational spectra and adsorption of trisiloxane superspreading surfactant at air/water interface studied with sum frequency generation vibrational spectroscopy
作者: Feng, Jun2;  Wu, Dan1, 3;  Wen, Jia2;  Liu, Shi-lin2;  Wang, Hong-fei1
关键词: trisiloxane surfactant ;  superspreader ;  surface adsorption ;  sum frequency generation vibrational spectroscopy
刊名: CHINESE JOURNAL OF CHEMICAL PHYSICS
发表日期: 2008-08-01
DOI: 10.1088/1674-0068/21/04/314-323
卷: 21, 期:4, 页:314-323
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Physics
英文摘要: The C-H stretch vibrational spectra of the trisiloxane superspreading surfactant Silwet L-77 ((CH3)(3)Si-O-Si(CH3)(C3H6)(OCH2CH2)(7-8)OCH3)-O-Si(CH3)(3)) at the air/water interface are measured with the surface Sum Frequency Generation Vibrational Spectroscopy (SFG-VS). The spectra are dominated with the features from the -Si-CH3 groups around 290.5 cm(-1) (symmetric stretch or SS mode) and 2957 cm(-1) (mostly the asymmetric stretch or AS mode), and with the weak but apparent contribution from the -O-CH2- groups around 2880 cm(-1) (symmetric stretch or SS mode). Comparison of the polarization dependent SFG spectra below and above the critical aggregate or micelle concentration (CAC) indicates that the molecular orientation of the C-H related molecular groups remained unchanged at different surface densities of the Silwet L-77 surfactant. The SFG-VS adsorption isotherm suggested that there was 110 sign of Silwet L-77 bilayer structure formation at the air/water interface. The Gibbs adsorption free energy of the Silwet surfactant to the air/water interface is -42.2 +/- 0.8kcal/mol, indicating the unusually strong adsorption ability of the Silwet L-77 superspreading surfactant.
关键词[WOS]: ALKYL-PYRROLIDINONE MIXTURES ;  HYDROPHOBIC SURFACES ;  MOLECULAR-ORIENTATION ;  AQUEOUS FILMS ;  LIQUID INTERFACES ;  TENSION DYNAMICS ;  WATER-MOLECULES ;  PHASE-BEHAVIOR ;  SOLID-SURFACES ;  SFG-VS
语种: 英语
WOS记录号: WOS:000259288800003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141068
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.Univ Sci & Technol China, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100864, Peoples R China

Recommended Citation:
Feng, Jun,Wu, Dan,Wen, Jia,et al. Vibrational spectra and adsorption of trisiloxane superspreading surfactant at air/water interface studied with sum frequency generation vibrational spectroscopy[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2008,21(4):314-323.
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