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仪器网/ 行业应用/ 解决方案/ 关于油/水, 空气/水界面的过渡态研究

关于油/水, 空气/水界面的过渡态研究

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Insoluble monolayers at the air-water interface are exposed to a gas phase containing organic hydrocarbons. The hydrocarbons are partly incorporated within the monolayer which leads to changes
in orientational order and the formation of new phases of different morphology. The transition state resembles features of the air-water and oil-water interface and the control of the hydrocarbon partial
pressure allows continous tuning between both interfaces. The phospholipid D,L-R-dipalmitoylphosphatidylethanolamine,DPPE, and an esterdiol hexadecanoic acid, 2,3-dihydroxypropyl ester, ESD-16, are used as amphiphiles, and pentane, n-hexane, cyclohexane, 2,2-dimethylbutane, n-heptane, n-decane, and n-dodecane are used as hydrocarbons. Both amphiphiles differ in their headgroup size. In DPPE the aliphatic tail determines the packing within the monolayer, but in the case of ESD-16 it is the headgroups.The structural changes are monitiored by surface pressure-area (ð,A) isotherms and imaging ellipsometry.The influence of the chemical nature of the hydrocarbon and the effect of the partial pressure of the
hydrocarbon on the monolayer structure are assessed. 组合式多功能椭偏仪
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