The Research Of Electrostatic Interaction Between Metal Ions And Monolayer

Mankind to understand the elements of the monolayer's process look like the search for a long time to go navigation. The technology of Langmuir-Blodgett film (LB film for short) lead to the first climax of study on monolayer and LB films in the 20th century 30s. It attracted the attention of scientific research and technical staff from then on. It is the hot topics of the Film and Cell Biophysics.In order to strengthen the links with LB film and the activities of life, promote the value of LB film in all aspects of research. We should combined LB films with metal ions. The inorganic salt is the necessary ingredients of cells, it can adjust the structure of the cell membrane and pH value in surrounding environment. Keep the balance with osmosis for the life and normal activities. On that way, we will get LB films with more physical characteristics, such as the magnetic, the quantum and the electrical conductivity, when the interaction between metal ions and monolayer. Metal ions interact with monolayer by three methods, such as electrostatic, coordination interactions and other composite of the interface. Because of metal ion, the import of the molecules from the interaction between two elements has changed, thus affecting the elements of nature. Therefore, the research between metal ions and molecules has more significance.This article use theoretical analysis and experimental intend to give a reasonable explanation, which has not been solved on previous research. In the experiment, we choose phosphatidylglycerols to be film material. It is an organic material, which has a charge in polarity first base. According to the structure features of phospholipids molecule and presents a simplified model, which named point charge model. In this model, according to analysis all kinds of interaction and the case of highly stressed in valid range by the classic electromagnetic theory, we could got theoretically rules that the effect attributes in the elements of metal ions to characteristics of isotherms. The analysis of the n-A isotherms show that the smaller of the metal ions radius is, the amount of the corresponding curves of Aq will accordingly smaller. The phase transition point c, will be changed more apparently. The collapse pressure will become larger subsequently, and the curve will be extended outside. The phenomenon can be approached when the metal ion concentration C became greater, and the valence of metal ions Q is increasing. On the contrary, the results are different.These experiments are identified the rules on Langmuir films, which a variety of properties of metal ions. As well as the properties of metal ions on the Langmuir film phase-change characteristics of the impact strength of sorting, found its greatest impact on ion valence, followed by the ion concentration, while the ionic radius of the phase-change characteristics of less affected. This could simply be expressed as:Q>C>R. At the same time, we use the theoretical analysis got the laws, that the metal ion impacting of the LB films' structure. Due to the main impact of metal ions and molecules is the closely of LB molecules and a molecule with mica, the analysis shows that the higher the ionic valence state, the smaller the radius, the greater the ion concentration, the molecule of LB films are more intensive. And the combing power between monolayer and substrate will be stronger, the stability of films will be better. Finally, we use the experiment methods of controlled variable and contrast, to make sure that the interaction between metal ions and monolayer on the formation, strength, structure, phase behavior and morphology of monolayer. The experiments data is consistent with the theory better. Further support the theoretical analysis'rationality and accuracy.