Microstructure and rheological properties of liquid crystallines formed in Brij 97/water/IPM system
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- 作者：Zhongni Wang ; Zhaoyu Diao ; Feng Liu ; Ganzuo Li and Gaoyong Zhang
- 关键词：Brij 97 nonionic surfactant ; Liquid crystals ; SAXS ; Rheology
- 刊名：Journal of Colloid and Interface Science
- 出版年：2006
- 出版时间：15 May 2006
- 年：2006
- 卷：297
- 期：2
- 页码：813-818
- 全文大小：434 K
文摘
The phase diagram of Brij 97/water/IPM systems was determined at 25 °C. Rich liquid crystalline phases including Lα, 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, Lα, 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″).