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Chapter 12

Physical Properties of Insoluble Monolayers

Monolayers on a water substrate are produced by substances that, while insoluble in bulk water, have enough hydrophilic (i.e. hydrogen bonding) character to dissolve in the surface layer of water, and by doing so demonstrate a physical difference between bulk and superficial water. Measurements of the properties of insoluble monolayers have the form of two-dimensional spreading pressures versus areas per molecule on the surface. Molecular dimensions are obtained thereby and the data have also been useful to settle disputed points about the structure of organic molecules.

Key Words: Langmuir trough, Langmuir-Blodgett, monolayer, monolayer phases, spreading pressure, surface solubility, viscoelasticity






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