Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (03): 216-221.doi: 10.3866/PKU.WHXB19990305

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The Influence of Alcohol on the Aggregation Behavior of DDAHPS Molecules in Water

Shen Qiang, Li Gan-Zuo, Huang Yan-Zhang, Ye Jian-Ping   

  1. Key laboratory for the Colloid and Interface Chemistry of Education Commission,Shandong University,Jinan 250100|Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Science,Langfang 065007|Laboratory of Photochemistry,Institute of Photographic Chemistry,Chinese Academy of Science,Beijing 100101
  • Received:1998-06-04 Revised:1998-08-30 Published:1999-03-15
  • Contact: Li Gan-Zuo

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Abstract:

The influence of alcohol on the aggregation behavior of the zwitterionic surfactant (dodecyldimethylammonium hydroxyl propanesulfonate, DDAHPS) molecules in water has been investigated by the steady state fluorescence quenching technique and the time resolved fluorescence method. The results show that the aggregation number of surfactant ( N ) decreases with the increasing addition of n butanol in 4.0×10 -2 mol•L -1 DDAHPS aqueous solution. Keeping the concentration of alcohol constant(ie. 2.14×10 -2 mol•L -1 ),the longer of the carbon chain of alcohol, the larger of the N value. The addition of n propanol and n butanol decrease the N value, while the n pentanol, n hexanol and n heptanol increase the N value. We also measured the effect of alcohol on the microenvoirnment polarity, pyrene fluorescence lifetime and efficiency of intramicellar excimer formation by pyrene.

Key words: Steady-state fluorescence quenching, Time-resolved fluorescence, Aggregation behavior, Dodecyldimethylammonium hydroxyl propane sulfonate(DDAHPS)