期刊文献+

Vibrational Spectra and Adsorption of Trisiloxane Superspreading Surfactant at Air/Water Interface Studied with Sum Frequency Generation Vibrational Spectroscopy

Vibrational Spectra and Adsorption of Trisiloxane Superspreading Surfactant at Air/Water Interface Studied with Sum Frequency Generation Vibrational Spectroscopy
下载PDF
导出
摘要 The C-H stretch vibrational spectra of the trisiloxane superspreading surfactant Silwet L-77 ((CH3)3Si- O-Si(CH3)(C3H6)(OCH2CH2)7-8OCH3)-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 2905 cm^-1 (symmetric stretch or SS mode) and 2957 ^-1 (mostly the asymmetric stretch or AS mode), and with the weak but apparent contribution from the -O-CH2- groups around 2880 ^-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 no 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.
出处 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第4期314-323,共10页 化学物理学报(英文)
关键词 Trisiloxane surfactant Superspreader Surface adsorption Sum frequency generation vibrational spectroscopy 吸附作用 振动光谱 物理分析 空水界面 频率
  • 相关文献

参考文献64

  • 1M. J. Rosen and Y. F. Wu, Langmuir 17, 7296 (2001).
  • 2R. M. Hill, Curr. Opin. Coll. Inter. Sci. 3, 247 (1998).
  • 3Z. Lin, R. M. Hill, H. T. Davis, and M. D. Ward, Langmuir 10, 4060 (1994).
  • 4T. F. Svitova, H. Hoffmann, and R. M. Hill, Langmuir 12, 1712 (1996).
  • 5T. Stoebe, Z. Lin, R. M. Hill, M. D. Ward, and H. T. Davis, Langmuir 13, 7270 (1997).
  • 6T.-Stoebe, Z. Lin, R. M. Hill, M. D. Ward, and H. T. Davis, Langmuir 13, 7276 (1997).
  • 7T. Stoebe, Z. Lin, R. M. Hill, M. D. Ward, and H. T. Davis, Langmuir 13, 7282 (1997).
  • 8T. F. Svitova, R. M. Hill and C. J. Radke, Langmuir 17, 335 (2001).
  • 9T. F. Svitova, Y. P. Smirnova, and G. Yakubov, Coll. Surf. 101,251 (1995).
  • 10J. A. Zabkiewicz and R. E. Gaskin, Adjuvants Agrochem. 1, 141 (1989).

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部