一个高粘弹的阴离子蠕虫胶束体系

doi:10.3866/PKU.WHXB201304252

Abstract

Abstract:

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 (E_a) 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.

Key words: Carboxylate gemini surfactant, p-Dibenzenediol spacer, Wormlike micelle, High viscoelasticity, Temperature effect, Micelle formation mechanism

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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A Highly Viscoelastic Anionic Wormlike Micellar System

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