Adsorption layers, followed ellipsometrically

A model of flocculent and dripless adsorptive layers also is good agreed with the experimental ellipsometric data on kinetics of adsorption of different upon nature and length polymieric chains and also on number and distribution in them of the functional groups [19-23], It is follows from these references that the kinetic curves of adsorption of the polymeric chains Ifom the diluted solutions consist of two sections the first is starting - quick and short with the characteristic time by 10 s order and the second one (final) - slow and long with the characteristic time... 

The first ellipsometric measurement of the thickness of the adsorbed layer and the adsorbance of a polyelectrolyte and a negative adsorbance of salt onto a solid surface was reported by Takahashi et al.U4) They measured the adsorption of sodium poly(acrylate) (M = 950 x 103) onto a platinum plate as a function of the concentration of added sodium bromide. In an aqueous polyelectrolyte solution with an added simple salt, the bulk phase is a three-component system which consists of a polyelectrolyte, a simple salt, and water. The adsorbed layer on the solid surface is a three-component phase as well. The adsorbance of polyelectrolytes thus cannot easily be determined from measurements of the refractive index nf of the adsorbed phase. Hence, it was assumed that the adsorbed layer is a homogeneous layer of thickness t and further that nf is represented by the Lorenz-Lorentz equation as follows ... 

At a substrate temperature of 340 K, the adsorption of CH3 is observed with ellipsometry. The change of the ellipsometric signal is depicted in Fig. 11.7. The points 1, 2, and 3 label consecutive stages in the evolution of the ellipsometry data points in the plane point 1 represents the C D layer at the beginning of the experiment. With the onset of the CH3 flux, the ellipsometric angles shift at first to larger values of and A (point 1 to 2), followed by a shift to larger values of but smaller values of A (point 2 to 3). 

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