Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (04): 913-917.doi: 10.3866/PKU.WHXB20110420

• SOFT MATTER • Previous Articles     Next Articles

Effect of Sodium Salicylate on the Formation and Properties of Wormlike Micelles in Aqueous Cationic Gemini Surfactant Solutions

PEI Xiao-Mei1, ZHAO Jian-Xi1, WEI Xi-Lian2   

  1. 1. Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, P. R. China;
    2. College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China
  • Received:2010-12-06 Revised:2011-01-26 Published:2011-03-29
  • Contact: ZHAO Jian-Xi, WEI Xi-Lian;
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20673021, 20873024, 21073081).


The effect of sodium salicylate (NaSal) on the formation and properties of wormlike micelles in aqueous solutions of 2-hydroxyl-propanediyl-α,ω-bis(dimethyldodecylammonium bromide) (12-3(OH)-12) and propanediyl-α,ω-bis(dimethyldodecylammonium bromide) (12-3-12) at a surfactant concentration of 50 mmol·L-1 was investigated using steady-state and frequency sweep rheological measurements. In the absence of a salt, 12-3(OH)-12 or 12-3-12 only produced spherical or small rod-like micelles at 50 mmol·L-1. The addition of NaSal promoted micellar growth yielding wormlike micelles in both systems. 12-3(OH)-12 showed a more sensitive response to the added NaSal compared with 12-3-12 and formed wormlike micelles at relatively lower salt concentrations. Moreover, the wormlike micelles formed by 12-3(OH)-12 were longer than those formed by 12-3-12, resulting in higher viscosity for the former solution. These were attributed to the hydrogen bonding interactions between the hydroxyl substituted spacers in the 12-3(OH)-12 system, which increased hydration on the aggregate surface and stimulated the dissociation of counterions. The higher charge on the 12-3(OH)-12 micellar surface was strongly associated with Sal-, which led to a tighter packing of the surfactant molecules in the micelles and thus strengthened the intermolecular hydrogen bonding interactions and effectively reinforced the growth of the 12-3(OH)-12 micelles.

Key words: Cationic gemini surfactant, NaSal, Wormlike micelle, Rheological property, Intermolecular hydrogen bond


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