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The Setup of in situ Monitoring System and Study on Aggregation Structure of Langmuir Monolayer at the Air-Water Interface

Author: DaiShuZuo
Tutor: DuZuLiang
School: Henan University
Course: Condensed Matter Physics
Keywords: Monolayers Gas-liquid interface Aggregation structure Morphology Octadecylamine Phospholipid molecules Silver nanoparticles Isotherm Imaging Systems Aggregation process
CLC: O488;O485
Type: Master's thesis
Year: 2001
Downloads: 67
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Abstract


Using the LB technique to construct nano-structured and orderly function system, to develop a variety of new high-performance high-tech fields applied nano-structured materials, has become the main direction of development LB technique. In order to study the structure of its membrane assembly function, scientists recent monolayer cohesion and phase transitions of serious attention, and made important progress. Developed a variety of high sensitivity analysis in place of the surface membrane structure and aggregation process. Since SERS technology high sensitivity surface and interface structure, providing information on the molecular level, has become a monolayer of a powerful research tool. Based on the above background, we designed and built the reign of testing and micro-Raman imaging system, the entire system, including micro-Raman test device, designed and fabricated micro-tensioned membrane tank and CCD imaging system in place. Aggregation process can provide a monolayer molecular scale from microns to the structure of the information gathering phase transition. Our use of the system to carry out research work includes: 1. On Silver Asian phase was octadecylamine monolayers Raman signals, using microscopic imaging studies have shown that the reign of octadecylamine molecules and silver nanoparticles have a strong interactions, resulting silver nanoparticles in monolayers under a large concentration, thus becoming the monolayer enhanced Raman good base. By mixing the phospholipid membrane octadecylamine molecules using octadecylamine and strong adsorption of silver particles, the concentration in the mixed film of silver particles, to obtain a good Raman signal phospholipid molecules. Experiments show that by adding octadecylamine film, the silver plastic Asia phases can also get information on other materials, Raman, proved that this method has a very wide range of applications. 2 Use the reign of isotherms and imaging systems studied octadecylamine / phospholipid monolayers on Silver Asian phase thermodynamic properties and its cohesion, phase change process, right on the water subphase chlorophyll, DDP-FeS nanoparticles monomolecular film on various systems in the gas-liquid interface aggregation morphology were studied. 3 By the reign of isotherms and AFM measurements to study the amino acid interactions between membrane phospholipid molecules. Found with the adsorption time increases, phospholipid molecules limit area increases, the transfer to the substrate in LB monolayer test directly observed by AFM amino acid phospholipid molecules in the crystal growth process in the film.

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CLC: > Mathematical sciences and chemical > Physics > Solid State Physics > Surface physics
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