Microstructure and rheological properties of liquid crystallines formed in Brij 97/water/IPM system.
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'').
Wang
Zhongni
Z
Department of Chemistry, Shandong Normal University, Jinan 250014, China. zhongniw@hotmail.com
Diao
Zhaoyu
Z
Liu
Feng
F
Li
Ganzuo
G
Zhang
Gaoyong
G
D050866:Liquid Crystals / Q000737:chemistry*; D015394:Molecular Structure; D044367:Phase Transition; D010938:Plant Oils; D011092:Polyethylene Glycols; D012212:Rheology; D053838:Scattering, Small Angle; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water; D014961:X-Ray Diffraction
D010938:Plant Oils; D013501:Surface-Active Agents; D014867:Water; D011092:Polyethylene Glycols; C033084:polyethylene glycol oleyl ether