Surfactant Complex System Behavior And Structural Characteristics

1. Property of the Mixed Micelles Composed of Sodium Dodecyl Sulfate (SDS) and TX-100 and Partition of Pyrene between the Mixed Micelle and WaterThe properties of the mixed micelle formed by SDS and TX-100 are studied by the methods of conductivity, ITC, fluorescence and viscosity measurements, and the distribution coefficient of Py between mixed micelle and water is determined. The results show that the increasing of TX-100 is helpful to the formation of mixed micelle. At mole fraction of components TX-100 (αTX-100) = 0.6, the partition coefficient of pyrene between the mixed micelle and water is highest due to a suitable component in the mixed micelle, which resultes in the loosest structure of the mixed micelle. SDS cooperates strongly with TX-100 and the viscosity of the mixed micelle system increases with the increase ofαTX-100.2. Phase Behavior and Structure Character of SDS/TX-100/Water SystemThe phase behavior of SDS/TX-100/H₂O system is shown by the phase diagram. The micro-structures of the aggregates are studied by the methods of cyclic voltammetry, small-angle X-ray scattering (SAXS) and freeze-fracture images. The results show that SDS/TX-100/H₂O system can form L1 micelle region,L2 reverse micelle region and hexagonal liquid crystal(HEX).The isotropic region connecting with water corner consists of three different rod-like micelles. The self-aggregation of SDS and TX-100 in aqueous solution and the interaction between them are studied by 1H NMR spectra. The results show that the interaction between SDS and TX-100 affects the formation of the mixed micelles and micro-structures transfer in the mixed micelles region. In the Hex phase, the structure of hexagonal liquid crystal is becoming looser with the increasing of water when the ratio of SDS and TX-100 is a constant. However, when the content of water is a constant, mixed micelles array more and more tightly with the addition of SDS and it is more and more differcult for water to enter into the micelle inside.3. Phase Behavior and Structure Character of SDS/Brij 30/Water SystemThe phase behavior of SDS/Brij 30/H₂O system is shown by the phase diagram. The results show that SDS/Brij 30/H₂O system can form L1 micelle region,L2 reverse micelle region, lamellar liquid crystal (LLC) and hexagonal liquid crystal (HEX).The Viscoelastic property of mixed micelles composed of SDS/Brij 30 is studied by rheometer. The results show that there are worm-like micelles in the system, the viscosity of the systerm increase sharply and the viscoselasty of the solution is very high. In addition, the results above are evaluated by freeze-fracture images and dynamic light scattering for supplementary information.4. Phase Behavior and Structure Character of Tween 80/Brij 30/Water SystemThe phase behavior of Tween 80/Brij 30/H₂O system is shown by the phase diagram. The results show that Tween 80/Brij 30/H₂O system can form L1 micelle region,L2 reverse micelle region, lamellar liquid crystal (LLC) and hexagonal liquid crystal (HEX). There are also worm-like micelles in the system as in SDS/Brij30/H₂O system. The viscoelastic properties of worm-like micelles are studied by rheometer. In addition, the results above are evaluated by freeze-fracture images and dynamic light scattering for supplementary information. However, the viscoelastic properties are weaker than that formed by SDS/Brij 30.