物理化学学报 >> 2003, Vol. 19 >> Issue (11): 1069-1072.doi: 10.3866/PKU.WHXB20031117

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偶联表面活性剂在气/液界面上的区域形貌

陈启斌;董亚明;刘洪来;胡英   

  1. 华东理工大学化学系，国家重点化学工程联合实验室，上海　200237
  • 收稿日期:2003-04-29 修回日期:2003-06-02 发布日期:2003-11-15
  • 通讯作者: 刘洪来 E-mail:hlliu@ecust.edu.cn

Observation of the Domain Morphology of Gemini Surfactant at an Air/Liquid Interface Using BAM

Chen Qi-Bin;Dong Ya-Ming;Liu Hong-Lai;Hu Ying   

  1. Department of Chemistry, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai　200237
  • Received:2003-04-29 Revised:2003-06-02 Published:2003-11-15
  • Contact: Liu Hong-Lai E-mail:hlliu@ecust.edu.cn

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摘要： 测定了偶联表面活性剂propilidene-1,3-bis(dimethyloctadecylammonium bromide) (PBDOAB)在0.005 mol•L－1 NaBr溶液气/液界面上的分子面积和表面压－分子面积等温线.用自制的Brewster角显微镜观察了PBDOAB在该溶液的气/液界面上的区域结构.结果表明, PBDOAB在0.005 mol•L－1 NaBr溶液的气/液界面上生成了凝聚态的单分子膜；观察到在界面上形成了环形的区域结构;在环形结构内的分子取向呈中心对称.

关键词: 偶联表面活性剂, 界面, Brewster角显微镜(BAM), 区域形貌, 单分子层

Abstract: The surface pressure-area per molecule isotherm of Gemini surfactant [propilidene-1,3- bis(dimethyloctadecylammonium bromide), PBDOAB] at an air/liquid interface of 0.005 mol•L-1 aqueous NaBr solution has been measured. The cross-sectional area of PBDOAB at the air/liquid interface has been obtained. Domain morphology formed by PBDOAB at the air/liquid has been investigated via BAM. Results show that PBDOAB forms condensed monolayer; that the circular domain morphology has been observed and that in the circular domains the molecular orientations of the PBDOAB is of central symmetry at the air/liquid interface of the aqueous NaBr solutions. It is proved that the chemical structure of Gemini surfactants strongly influences their properties at the air/liquid interface.

Key words: Gemini surfactant, Interface, Brewster angle microscope(BAM), Domain morphology, Monolayer