Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (10): 1652-1656.doi: 10.3866/PKU.WHXB20071031

• Note • Previous Articles    

Dynamic Dilational Properties of 2,5-dipropyl-4-undecylbenzene Sulfonate at the Air/Water Interface

ZHANG Lei; WANG Xiao-Chun; GONG Qing-Tao; LUO Lan; ZHANG Lu; ZHAO Sui; YU Jia-Yong   

  1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, P. R. China
  • Received:2007-04-12 Revised:2007-05-29 Published:2007-10-01
  • Contact: ZHAO Sui

Abstract: The dynamic dilational viscoelaticity properties of sodium 2,5-dipropyl-4-undecylbenzene sulfonate (3-11-3) at air/water interface were investigated by drop shape analysis. The influences of time, surface pressure, dilational frequency and concentration on surface dilational modulus and phase angle were explored. The experiment results showed that the film was elastic in lower surface pressure range, which was believed to be dominated by the in-surface process. In contrast, the viscous behavior become noticeable in higher surface pressure range, which indicates the diffusion-exchange process between bulk and surface dominates the nature of film.

Key words: Sodiumalkyl benzene sulfonate, Dynamic interfacial dilational property, Dilational modulus, Phase angle


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