| Vibrational Spectra and Adsorption of Trisiloxane Superspreading Surfactant at Air/Water Interface Studied with Sum Frequency Generation Vibrational Spectroscopy |
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| 作者姓名： | 冯军 吴丹 闻佳 刘士林 王鸿飞 |
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| 作者单位： | 中国科学技术大学合肥微尺度物质科学国家实验室，化学物理系，合肥 230026;中国科学院化学研究所分子科学国家实验室分子反应动力学实验室，北京 100190;中国科学技术大学合肥微尺度物质科学国家实验室，化学物理系，合肥 230026;中国科学技术大学合肥微尺度物质科学国家实验室，化学物理系，合肥 230026;中国科学院化学研究所分子科学国家实验室分子反应动力学实验室，北京 100190 |
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| 基金项目： | 国家自然科学基金,国家重点基础研究发展计划 |
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| 摘 要： | 使用界面和频振动光谱(SFG-VS)测量了空气/水界面三甲基硅烷表面活性剂Silwet L-77的C-H伸缩振动光谱．这些光谱峰主要是在2905 cm-1附近属于-Si-CH3基团的对称伸缩(SS)振动，在2957 cm-1的主要是-Si-CH3基团反对称伸缩(AS)振动，以及明显较弱的在2880 cm-1附近的属于-O-CH2-基团的对称伸缩(SS)振动．通过比较低于和高于临界聚集或胶束浓度(CAC)的SFG-VS偏振光谱显示Silwet L-77分子的C-H基团取向在不同的界面密度下变化很小．SFG-VS测量的吸附等温线表明Silwet L-77分子在空气/水界面没有形成所谓的双层结构的迹象．Silwet L-77分子在空气/水界面的Gibbs吸附自由能为-42.2±0.8 kJ/mol，表明该分子具有很强的表面吸附能力．
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| 关 键 词： | 三甲基硅烷表面活性剂，超铺展性，表面吸附，和频振动光谱 |
| 收稿时间： | 2008/5/10 0:00:00 |
| 修稿时间： | 6/1/2008 12:00:00 AM |
Vibrational Spectra and Adsorption of Trisiloxane Superspreading Surfactant at Air/Water Interface Studied with Sum Frequency Generation Vibrational Spectroscopy |
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| Jun Feng,Dan Wu,Jia Wen,Shi-lin Liu and 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. |
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| Authors: | Jun Feng Dan Wu Jia Wen Shi-lin Liu and Hong-fei Wang |
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| Institution: | Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | |
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| Keywords: | Trisiloxane surfactant Superspreader Surface adsorption Sum frequency generation vibrational spectroscopy |
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