Adsorption on liquid surfaces

Our approach until now has been to discuss adsorption isotherms on the basis of the equation of state of the corresponding two-dimensional matter. This procedure is easy to visualize and establishes a parallel with adsorption on liquid surfaces (Chapter 7) however, it is not the only way to proceed. In the following section we consider the use of statistical thermodynamics in the derivation of adsorption isotherms and examine some other approaches in subsequent sections. 

SURFACE FILMS OF SOLUBLE OR VOLATILE SUBSTANCES ADSORPTION ON LIQUID SURFACES... 

In this chapter, we will discuss how the chemical and physical properties of substances at interfaces differ from those in the bulk. For quantitative description, quantities like surface tension and surface energy have to be introduced. With the help of these quantities, phenomena known from everyday life like the lotus effect can be explained. However, perhaps you are more interested to learn how detergents clean Then have a look at Sect. 16.3 which deals with the adsorption on liquid surfaces. The next section covers the adsorption on solid surfaces and the variation of the extent of coverage with pressure or concentration of the substance to be adsorbed. Langmuir s isotherm, the simplest description of such an adsorptiOTi process, is deduced by kinetic interpretation of the adsorption equilibrium. Alternatively, it can be derived by introducing the chemical potential of free and occupied sites and cmisideiing the equilibrium condition. In the last part of the chapter, some important applications such as surface measurement and adsorption chromatography are discussed. 

The standard procedure for studying adsorption on liquid surface [3, 8] assumes that solutions are effectively at infinite dilution and there is no interaction with the support. Then ... 

In principle, the softest adsorbates are liquids, and adsorption at the mercury-solution interface is at the basis of one of the most common analytical technique -polarography. A theory of adsorption on liquid surfaces is facilitated by the fact that liquid are always characterized by an equilibrium configuration and has actually been developed [38], No such a theory is known for less extreme situations, in which the adsorbate does reconstruct partially without attaining an equilibrium configuration. 

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