Dynamic Rheological Analysis of MLVs and Lamellar Phases in the System C12E4 / D2O
Dynamic Rheological Analysis of MLVs and Lamellar Phases in the System C12E4 / D2O
复制标题
C12E4 / D2O 系统中 MLV 和层状相的动态流变分析
DOI：
10.1515/arh-2005-0014
复制
发表时间：
2005
期刊：
影响因子：
1.8
通讯作者：
C. Oliviero
中科院分区：
文献类型：
--
作者：
L. Coppola;I. Nicotera;C. Oliviero
摘要：研究了C12E4/D2O体系层状相La在10 ~ 60℃温度范围内的力学性能。采用小应变振荡流变法进行动态分析。多层囊泡（“MLVs”）（“洋葱”）通过剪切层状相而转化。通过稳态和动态流变实验对胶束相进行了研究。加热后胶束聚集体尺寸略有增大，胶束向片层的转变为一级转变。层状相的力学谱显示模量对频率有很强的依赖性。这是典型的有缺陷的片层相。它们与mlv的力学谱不同。mlv的黏度和储存模量几乎与频率无关，表现出强凝胶的特性。mlv相的形成温度影响mlv的力学性能。在25 ~ 55℃的温度范围内，观察到mlv相的三种不同的堆积状态。
Abstract The mechanical properties of the lamellar phase, La, of the system C12E4/D2O were studied along an isoplethal path (30 wt% C12E4) in the temperature range 10 - 60°C. A dynamic analysis was determined by small strain oscillatory rheometry. The multilamellar vesicles (“MLVs”) (“onions”) were transformed by shearing the lamellar phase. The micellar phase was investigated by steady and dynamic rheological experiments. The micellar aggregate size increases slightly upon heating and the transition from micelles to lamellae appears to be a first order transition. The mechanical spectra of the lamellar phase show a strong dependence of the moduli on the frequency. This is typical of defective lamellar phases. They are different from MLVs mechanical spectra. The MLVs viscous and storage moduli are almost independent from the frequency and they exhibit the characteristics of a strong gel. The temperature of formation of the MLVs phase influences the mechanical properties of the MLVs. Three different packing states of the MLVs phase were observed in the temperature range 25 - 55°C.