物理化学学报2013，Vol.29Issue(7)：1534-1540,7.DOI:10.3866/PKU.WHXB201304252
一个高粘弹的阴离子蠕虫胶束体系
A Highly Viscoelastic Anionic Wormlike Micellar System
摘要
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 1.10x 104 Pa· s) that looked like a gel.On raising the temperature to 70 ℃C,the relative viscosity was still as high as 1.8x104,which is very rare for anionic wormlike micelle systems.The flow activation energy (Ea) was estimated to be (141±5) kJ· mo1-1.The size distribution of C14φ2 C14 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.关键词
羧酸盐gemini表面活性剂/对联苯二酚联接链/蠕虫胶束/高粘弹性/温度效应/胶束形成机理Key words
Carboxylate gemini surfactant/ p-Dibenzenediol spacer/ Wormlike micelle/High viscoelasticity/ Temperature effect/ Micelle formation mechanism分类
化学化工引用本文复制引用
谢丹华,赵剑曦,刘琳,游毅,魏西莲..一个高粘弹的阴离子蠕虫胶束体系[J].物理化学学报,2013,29(7):1534-1540,7.基金项目
The project was supported by the National Natural Science Foundation of China (20873024,21273040).国家自然科学基金(20873024,21273040)资助项目 （20873024,21273040）
