由碳酸钠诱导形成的油酸钠蠕虫状胶束的流变学性质  

Rheological Properties of an Anionic Wormlike Micelle of Sodium Oleate Induced by Sodium Carbonate

作　　者：曹泉[1] 于丽[1] 孙立新[1] 郑利强[1] 李干佐[1] 

机构地区：[1]山东大学胶体与界面化学教育部重点实验室,济南250100

出　　处：《化学学报》2007年第17期1821-1825,共5页Acta Chimica Sinica

基　　金：山东省科技攻关计划基金(Nos.2004GG2203094;2006GG2206004)资助项目.

摘　　要：当Na2CO3浓度逐渐增加时,用流变学的方法研究了阴离子表面活性剂油酸钠(NaOA)在溶液中从胶束转变成蠕虫状胶束的过程.首先测量体系剪切粘度(η)和剪切速率的关系得到零剪切粘度(η0).然后由动态振荡实验得到复合粘度(|η*|)、动态模量(储能模量G'、损耗模量G"和结构松弛时间τs)等物理量.应用Cox-Merz规则和Cole-Cole图,证明NaOA(0.040～0.080mol/L)/Na2CO3(0.25～0.50mol/L)体系形成蠕虫状胶束,且蠕虫状胶束的动态粘弹性在NaOA(0.050～0.080mol/L)/Na2CO3(0.35～0.45mol/L)范围是符合Maxwell模型的线性粘弹性流体.The process of anionic surfactant sodium oleate micelles transforming from sphere or rod to wormlike in solution was investigated by rheological methods under the condition of increased sodium carbonate concentration. The relationship between the shear viscosity and shear rate was firstly measured so as to obtain zero shear viscosities （η0）. The complex viscosities （│η＊│）, dynamic modulus （storage modulus G＇, loss modulus G＇~ and relaxation time τs were then defined by dynamic oscillatory experiment. Finally, Cox-Merz rule and Cole-Cole plot were employed to prove that the system of NaOA （0.040-0.080 mol/L）/Na2CO3 （0.25-0.50 mol/L） have transformed into wormlike micelles whose dynamic viscoelasticity in the range of NaOA （0.050-0.080 mol/L）/Na2CO3 （0.35-0.45 mol/L）, complies with Maxwell model, therefore are supposed to be called linear viscoelastic fluid.

关 键 词：蠕虫状胶束 流变性 油酸钠 

分 类 号：O648.1[理学—物理化学]