ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2013,Vol.29>> Issue(07)>> 1534-1540     doi: 10.3866/PKU.WHXB201304252         中文摘要
A Highly Viscoelastic Anionic Wormlike Micellar System
XIE Dan-Hua1, ZHAO Jian-Xi1, LIU Lin1, YOU Yi1, WEI Xi-Lian2
1 Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian, 350108, P. R. China;
2 Department of Chemistry, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong, 252059, P. R. China
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The rheological behavior of carboxylate gemini surfactant O,O'-bis(sodium 2- tetradecylcarboxylate)-p-dibenzenediol (referred to as C14Φ2C14) with a concentration of 140 mmol·L-1 in aqueous solution in the presence of 100 mmol·L-1 NaBr was investigated by frequency sweep and steady rate sweep measurements. The solution showed the characteristics of a Maxwell fluid with a single stress relaxation time at low shear frequencies. Analysis by the living polymer model indicated that C14Φ2C14 formed long (3.6-6.8 μm) wormlike micelles at 25℃, which were observed by cryo-transmission electron microscopy (cryo-TEM). The micelles were entangled with each other, resulting in a very viscous solution (the zero-shear viscosity was as high as 1.10×104 Pa·s) that looked like a gel. On raising the temperature to 70℃, the relative viscosity was still as high as 1.8×104, which is very rare for anionic wormlike micelle systems. The flow activation energy (Ea) was estimated to be (141±5) kJ·mol-1. The size distribution of C14Φ2C14 was determined by dynamic light scattering. Large aggregates with a size of ~100 nm were observed at low concentrations of 5-10 mmol·L-1. These large aggregates readily transformed into rodlike and then wormlike micelles as the surfactant concentration increased.

Keywords: Carboxylate gemini surfactant   p-Dibenzenediol spacer   Wormlike micelle   High viscoelasticity   Temperature effect   Micelle formation mechanism  
Received: 2013-02-04 Accepted: 2013-04-24 Publication Date (Web): 2013-04-25
Corresponding Authors: ZHAO Jian-Xi Email:

Fund: The project was supported by the National Natural Science Foundation of China (20873024, 21273040).

Cite this article: XIE Dan-Hua, ZHAO Jian-Xi, LIU Lin, YOU Yi, WEI Xi-Lian. A Highly Viscoelastic Anionic Wormlike Micellar System[J]. Acta Phys. -Chim. Sin., 2013,29 (07): 1534-1540.    doi: 10.3866/PKU.WHXB201304252

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