Vibrational spectra and adsorption of trisiloxane superspreading surfactant at air/water interface studied with sum frequency generation vibrational spectroscopy

doi:10.1088/1674-0068/21/04/314-323

CORC > 化学研究所 > 中国科学院化学研究所

	Vibrational spectra and adsorption of trisiloxane superspreading surfactant at air/water interface studied with sum frequency generation vibrational spectroscopy
	Feng, Jun 2; Wu, Dan 1,3; Wen, Jia 2; Liu, Shi-lin 2; Wang, Hong-fei 1
刊名	CHINESE JOURNAL OF CHEMICAL PHYSICS
	2008-08-01
卷号	21 期号:4 页码:314-323
关键词	Trisiloxane Surfactant Superspreader Surface Adsorption Sum Frequency Generation Vibrational Spectroscopy
ISSN号	1674-0068
DOI	10.1088/1674-0068/21/04/314-323
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.
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000259288800003
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/64765]
专题	中国科学院化学研究所
通讯作者	Wang, Hong-fei
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
推荐引用方式 GB/T 7714	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.
APA	Feng, Jun,Wu, Dan,Wen, Jia,Liu, Shi-lin,&Wang, Hong-fei.(2008).Vibrational spectra and adsorption of trisiloxane superspreading surfactant at air/water interface studied with sum frequency generation vibrational spectroscopy.CHINESE JOURNAL OF CHEMICAL PHYSICS,21(4),314-323.
MLA	Feng, Jun,et al."Vibrational spectra and adsorption of trisiloxane superspreading surfactant at air/water interface studied with sum frequency generation vibrational spectroscopy".CHINESE JOURNAL OF CHEMICAL PHYSICS 21.4(2008):314-323.