Wang Zhongni, Diao Zhaoyu, Liu Feng, Li Ganzuo, Zhang Gaoyong
Department of Chemistry, Shandong Normal University, Jinan 250014, China.
J Colloid Interface Sci. 2006 May 15;297(2):813-8. doi: 10.1016/j.jcis.2005.11.021. Epub 2006 Jan 9.
The phase diagram of Brij 97/water/IPM systems was determined at 25 degrees C. Rich liquid crystalline phases including Lalpha, H1, and cubic Fd3m phases were identified by means of small angle X-ray scattering (SAXS). Microstructure transitions of liquid crystals with changes in surfactant concentration and oil content are explained qualitatively by the surfactant packing parameter (vL/aSlc). Dynamic rheological results indicate that all three kinds of liquid crystals investigated show high elasticity. The lamellar, Lalpha, phases formed in Brij 97/water with two different oils, oleic acid and geraniol, were also studied in comparison with those of Brij 97/water/IPM systems. The strength of the network of lamellar phases formed in Brij 97/water/oleic acid and Brij 97/water/geraniol systems are appreciably stronger than for Brij 97/water/IPM systems, indicated by the smaller area of surfactant molecules at the interface and the higher moduli (G' and G'').
在25摄氏度下测定了Brij 97/水/IPM体系的相图。借助小角X射线散射（SAXS）确定了包括Lα、H1和立方Fd3m相在内的富液晶相。通过表面活性剂堆积参数（vL/aSlc）定性解释了液晶微观结构随表面活性剂浓度和油含量变化的转变。动态流变学结果表明，所研究的三种液晶均表现出高弹性。还比较研究了在Brij 97/水体系中与两种不同油（油酸和香叶醇）形成的层状Lα相，以及Brij 97/水/IPM体系中的层状相。Brij 97/水/油酸和Brij 97/水/香叶醇体系中形成的层状相网络强度明显强于Brij 97/水/IPM体系，这由界面处表面活性剂分子的较小面积和较高模量（G'和G''）表明。
