Laureth 4 Stability Of Ga, Sa And Ta Three Kinds Of Emulsion Phase Behavior And Volatilization Characteristics Research

Emulsions are of decisive application in a large number of fields and attract the attention of peple. Volatile process of emulsion has directly effect on its nature and application. However, the current research is mainly concentrated on the physical and chemical properties of emulsion instead of the basic research of the volatile process. Emulsion volatile is a dynamic phenomenon, and phase behavior in emulsion volatile process is quite important for the formation of emulsion. Phase diagram plays an important role in gaining the potential information of phase behavior. Combined phase diagram with mathematics calculation, the evapartion path of emulsion can be obtained.In this work, the authors investigate the effect of lamellarliquid crystal, diffusion rate of molecule and solid particals on the evaporation of emulsion, which makes up for the defects of emulsion basic research, and provides some theoretical basis for the application for complex emusion, and contain the following three systems:1. The effect of liquid crystal on the phase behavior of emlusion during evaporation of emulsion in Laureth4/GA/Water systemThree-phase geranyl acetate emulsions stabilized by a non-ionic surfactant, Laureth4, were prepared with a constant weight fraction of a lamellar liquid crystal and varied aqueous to oil phase weight ratios according to the phase diagram. The appearance and micrographs of the drop pattern were recorded versus time. As expected from phase diagram, emulsions with the lower values of the W/O ratio appeared to be of the W/O variety while the two more stable emulsions with the highest W/O ratio appeared as O/W. Unpredictably, all the emulsions were of the O/W kind. The reason for this unanticipated outcome was the lamellar liquid crystal being dispersed into the aqueous phase at the slightest perturbation.2. Inter-Phase transport of compounds and the influence factors during evaporation of emulsion in Laureth4/S A/Water systemThe individual compounds in an emulsion system of water, a commercial surfactant, Laureth4, and salicylic acid were brought into contact in order to estimate the difference between emulsion phase changes during evaporation and those expected from equilibrium condition. The transfer of compounds between the phases was followed by visual observation of new phases appearing and the movement of the interfaces. The results showed the structure of the phases to exert a strong effect on the rate of the relocation of the compounds between the phases due to difference in diffusion rate between single molecules and inverse micelles.3. Inter-Phase transport of compounds and the influence factors during evaporation of emlusion in Laureth4/TA/Water systemThe equilibration between phases in an emulsion of tartaric acid stabilized by a commercial non-ionic surfactant, Laureth4, was studied by contacting layers of water, tartaric acid and surfactant and measuring the change of layer heights with time to estimate the deviation from equilibrium conditions during emulsion evaporation. In the present system the dissolution of the acid was faster than the formation of birefringent structures. And the present determinations disclosed the transfer of compounds between the solid acid phase and the liquids not to be the primary rate determining step in the equilibration process. Instead this step was found in the surfactant forming the liquid crystal from its liquid and in the transfer of acid from the surfactant liquid to the liquid crystalline structure.