Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (11): 1069-1072.doi: 10.3866/PKU.WHXB20031117

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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

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