Construction Of Stimulus-Responsive Complex Emulsion And Fabrication Of Anisotropic Particles With Tunable Morphology

Complex emulsion has a complex topological structure and chemical composition,and its unique properties show great potential in the fields of food,medicine,cosmetics and new materials.Especially in terms of material preparation,the use of complex emulsion can be used as a template for the preparation of anisotropic particles,and the structure and size of anisotropic materials can be precisely controlled.Therefore,it has become an important method for preparing anisotropic materials at present.In this thesis,a stimulus-responsive surfactant was first synthesized,and a stimulus-responsive complex emulsion was obtained by the compounding of the stimulus-responsive surfactant and the fluorocarbon surfactant.The morphology of the stimulus-responsive complex emulsion can be controlled and reversibly adjusted by the ratio of compound surfactants and the degree of irritation,and anisotropic particles with controllable structure can be prepared by using the stimulus-responsive complex emulsion as a template.The regulation mechanism of stimulating surfactant on the morphology of stimulus-responsive complex emulsion was further explored.The main research contents of this paper are as follows:（1）The electrical stimulus responsive surfactant（11-ferrocenylundecyl）-trimethylammonium bromide（FTMA）and the pH stimulus responsive surfactant N-dodecyl-1,3-propanediamine(C₁₂N₃N)were firstly synthesized,and using ¹H NMR and¹³C NMR to verify the molecular structure of the synthesized target product.The surface tension curve,ultraviolet-visible spectrum,cyclic voltammetry curve and other methods showed that FTMA has good electrical response performance,and C₁₂N₃N has good pH response performance.（2）The electro-responsive complex emulsion was constructed using the synthetic electro-stimulus-responsive surfactant FTMA.Two immiscible hydrocarbon phases（n-hexane,hexamethylene diacrylate）and fluorocarbon phases（perfluorooctane,ethyl nonafluorobutyl ether）are used as the internal phase,and the compound surfactants containing electro-stimulus-responsive surfactants FTMA are used as the continuous phase.The electrically responsive n-hexane-perfluorooctane system complex emulsion and hexamethylene diacrylate-ethyl nonafluorobutyl ether（HDODA-HFE7200）system complex emulsion is obtained by the high-speed shearing method.The control of the complex emulsion is achieved by changing the ratio of compound surfactants,and changing the intensity and time of electric field stimulation.The complex emulsion of HDODA-HFE7200system was prepared by ultraviolet light polymerization to obtain anisotropic particles with the same shape as the emulsion droplets.The research results show that the use of electric field stimulation can obtain complex emulsions with different topological structures,and use this as a template to prepare a variety of anisotropic particles with different morphologies,and the Marangoni effect caused by the imbalance of interfacial tension explains the mechanism of the reversible regulation of the topological structure of the complex emulsion by electrical stimulation.（3）A pH-responsive complex emulsion was constructed using synthetic pH stimulus-responsive surfactant C₁₂N₃N.Two immiscible hydrocarbon phases（n-heptane,hexamethylene diacrylate）and fluorocarbon phases（FC-770,methyl nonaflurobutyl ether）are the internal phases,and the compound surfactants containing pH stimulus-responsive surfactants C₁₂N₃N are the continuous phases,and the pH-responsive n-heptane-FC-770system complex emulsion and the pH-responsive HDODA-Me OC₄F₉ system complex emulsion is obtained by high-speed shearing method.The control of the complex emulsion is achieved by changing the ratio of the compound surfactant and the degree of pH stimulation.The complex emulsion of HDODA-Me OC₄F₉ system was prepared by ultraviolet light to obtain anisotropic particles with the same shape as the emulsion droplets.The results of the study show that the use of pH stimulation can obtain complex emulsions with different topological structures and use this as a template to prepare a variety of anisotropic particles with different morphologies.The Marangoni effect caused by the imbalance of interfacial tension explains the mechanism of pH-stimulated reversible regulation of the topological structure of the complex emulsion.