Study On Interfacial Chemical Phenomena In Two Phase Mixing

The unsaturated solution of low molar mass compounds dissolved in soluble solvent is inhomogenous. It means there is no mesoscopic structure above molecular size. In recent years, research shows that the microscopic structure of the internal solution is more complicated.This paper is to study the interface chemical phenomenon in the mixing of two phase(liquid-liquid mixing, solid-liquid mixed). The work mainly includes three aspects:(1)The property of SMAs in ethanol-water solution which is formed afer nonionic compound ethanol mixed with water,(2) Effect of ammonium sulfate solution on the properties of the mesoscopic structure (SMAs) formed by mixing ethanol with water,(3) Study on the mesoscopic structure (nanobubble)in the mixture of ionic inorganic substance(NaC1) with water and the mixture of nonionic organic matter (urea) with water. The following is the conclusion.(1) We used fluorescence analysis method to analyze ethanol-water solution. In this paper, we adopted two methods of preparation of ethanol-water solution interface spreading dissolution method and dispersion method by crushing injection. We can get some information after analyzing the fluorescence spectra of ethanol aqueous solution prepared by these two methods. In fluorescence spectra,the fluorescence peak of the ethanol-water solution by dispersion method by crushing injection is about 300nm. On the contrary,there is fluorescence peak of the ethanol-water solution by interface spreading dissolution method in 300nm. Fluorescence spectra difference shows that there is different structures existed in the two methods of preparation of ethanol-water solution.After NTA analysis of the ethanol-water solution prepared by the two methods,we can get the conclusion that the ethanl-water solution prepared by dispersion method by crushing injection is inhomogenous,we can see mesoscopic structure about 100nm(SMAs) in the solution.There is no mesoscopic structure in the ethanl-water solution prepared by interface spreading dissolution method. In this paper, we think that the structure of the fluorescence peak of 330nm is SMAs. We continued study by fluorescence analysis method on properties of SMAs and found that SMAs are relatively stable, the gas in the system induces the formation of SMAs.(2) To explore the effect of ammonium sulfate solution on SMAs of ethanol-water solution. The number of SMAs in ethanol-water solution during the process of oscillation is reduced.The possible reason may be during the process of oscillation SMAs are encountered on the container wall of the conical flask.It causes the damage of water molecules cage structure,so ethanol in SMAs spreading to the vessel wall.The gas in SMAs overflow, the concentration of SMAs decreases. The number of SMAs increased during the static placement process,the reason may be SMAs are grown up in the observation time. The size of SMAs is small when just finishing preparation of ethanol-water solution. The size is beyond the Nanosight range of observation, during static process, water molecules slowly get into small molecular structures of SMAs, which resulted in the structure of SMAs increases and reached the observation range of Nanosight, so with the growth of the placement time, the concentration of SMAs observed by Nanosight will increase.During the process of place water and ethanol molecules are formed by hydrogen bonding SMAs.(3) It will produce nanobubble afer the mixing of NaCl、urea with water.After adding salt to aqueous solution, the gas solubility is reduced,nanobubble is formed when gas extruded.