Surfactant On The Impact Of Electrolyte Solutions And Proton Exchange Membrane Fuel Cell

In the past two decades, with development of the modern technology and improving of the industrial level, the surfactant has formed an independent industrial system, and has been widely used in the fields of biology, medication, chemical, electro communication, new energy resource, etcThe electrolyte solution play an important role in industrial field, such as ore mining, tertiary oil, industrial water, etc. The different structure of electrolyte in the solution will be various characterization and conformation. It is useful to improve the serviceability with studying on the complex of polyelectrolyte brush-surfactant. And fuel cell is considered as green energy sources for the 21 st century, the supported and functional chemical engineering materials of surfactant which could enhance the utilization ratio of energy and reduce the waste of resource is employed. So study the influence of surfactant with electrolyte solution and fuel cell has important significance in theory and practice.So far, the above content were researched by experiment, we first study the interaction between complex of planar electrolyte brush-surfactant, complex of planar electrolyte brush-surfactant and surfactant which used in the Nafion membrane of Proton exchange membrane fuel cell to improve the hydrophilicity of membrane.Molecuolar dynamics simulation is a method which calculates the particle trajectories from particles standpoint. The coarse grained models are created which base the molecular structure of two electrolyte brushes, Nafion membrane and surfactant, while we establish the potential energy function by the interaction between the particles to simulate.The model of planar polyelectrolyte brush-surfactant is establish firstly, and the interaction between the complex and the conformation change are studied by the different of power ratio, counterion valence in the solution and grafting density of the polyelectrolyte. By analyzing the density of the particles, the average polyelectrolyte brush thickness and the mean square displacement, it is found that with the increase of electricity rates and counterion valence the complex is from gradually extended to part collapsed, even complete collapsed when the simulation balanced. It is not only because of electrostatic attraction, in effect the hydrophobic interaction of the surfactant play an important role. At the same time, the average thickness of the brushes affected when change the grafting density.New synthesis cylindrical polyelectrolyte brush and surfactant complex are also studied with the different of power ratio and counterion valence in the solution. By analyzing the distribution of particle density, the rotation of cylindrical polyelectrolyte brushes and the mean aquare radius from ten end, it is found that the cylindrical polyelectrolyte brush through rod-the spiral-horseshoe shaped transition, and the complex is from gradually extended to part collapsed, even complete collapsed when the simulation balanced. Simultaneously, the rod-shaped complex is also gradually become spherical when the counterion valence increased. The interaction between them is the same as the planar polyelectrolyte brush line. The conclusions are in agreement with the experiment.Nafion membrane as a diaphragm which has a high quality sub-conductivity, mechanical strength, chemical stability and good benefits is used in proton exchange membrane fuel cell. But its cost is expensive, and its cross-sectional area has a large hydrophobic micro-domains. According to the nature of the surface active agent, surfactants are added to the Nafion membrane system. Analysis of the radial distribution function between water molecular and particles revealed that surfactant can improve the Nafion membrane hydrophilic.It is the first time to study the contents by numerical simulation method above and the models in this article can be applied in more complex systems, the conclusions are valuable for reducing the friction of the interaction when add the surfactant to microstructure interface. While it is helpful to improve battery performance of proton exchange membrane fuel cell. The simulation methods and procedures in the paper can be widely applied to mechanical design theory.