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6930231 
Journal Article 
Dynamic dilational properties of 2,5-dipropyl-4-undecylbenzene sulfonate at the air/water interface 
Zhang, Lei; Wang, XC; Gong, Q; Luo, Lan; Zhang, Lu; Zhao, Sui; Yu, J; , 
2007 
Yes 
Acta Physico - Chimica Sinica
ISSN: 1000-6818 
PEKING UNIV PRESS 
BEIJING 
23 
10 
1652-1656 
Chinese 
WOS:000250412100031 
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. 
Dilational modulus; Dynamic interfacial dilational property; Phase angle; Sodium alkyl benzene sulfonate