Jun Feng, Dan Wu, Jia Wen, Shi-lin Liu, Hong-fei Wang. 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. doi: 10.1088/1674-0068/21/04/314-323
Citation: Jun Feng, Dan Wu, Jia Wen, Shi-lin Liu, Hong-fei Wang. 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. doi: 10.1088/1674-0068/21/04/314-323

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
Funds:  Supported by the National Natural Science Foundation of China (No.20425309 and No.20533070) and the Ministry of Science and Technology of China (No.2007CB815205). Shi-lin Liu thanks the support by the National Natural Science Foundation of China (No.20533
  • Received Date: 2008-05-10
  • Rev Recd Date: 2008-06-01
  • 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 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 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±0.8kJ/mol, indicating the unusually strong adsorption ability of the Silwet L-77 superspreading surfactant
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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
Funds:  Supported by the National Natural Science Foundation of China (No.20425309 and No.20533070) and the Ministry of Science and Technology of China (No.2007CB815205). Shi-lin Liu thanks the support by the National Natural Science Foundation of China (No.20533

Abstract: 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 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 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±0.8kJ/mol, indicating the unusually strong adsorption ability of the Silwet L-77 superspreading surfactant

Jun Feng, Dan Wu, Jia Wen, Shi-lin Liu, Hong-fei Wang. 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. doi: 10.1088/1674-0068/21/04/314-323
Citation: Jun Feng, Dan Wu, Jia Wen, Shi-lin Liu, Hong-fei Wang. 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. doi: 10.1088/1674-0068/21/04/314-323

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