Langmuir Surface Layers of Insoluble Materials on Liquids

6 Langmuir Surface Layers of Insoluble Materials on Liquids 

Insoluble monolayers may also exist at water-air as well as water-oil interfaces. In general, a monolayer of the same material tends to be more expanded at the water-oil interface than at the water-air interface, and usually it is recognized that a condensed mono-layer forms at the water-air interface whereas it sometimes becomes gaseous at the water-oil interface. In summary, investigation of the basic principles of monolayer formation is a requisite in surface physical chemistry. We will start by defining the spreading concept in section 5.6.1, then explaining the experimental methods in section 5.6.2. 

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