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In the introduction to this chapter, the process of the SRG formation, the suggested mechanisms, and the mostly used materials have been described Here the authors would like to underline that most results concerning SRG generation have been obtained using functionalized polymers, that is, materials with the azobenzene units covalently attached to the polymer chains The importance of these results can scarcely be exaggerated The investigations brought out a new process, namely, the light-driven mass transport The process is peculiar to azobenzene-containing materials Following investigations led to understanding of the process and brought a variety of photosensitive materials and new applications of them The latter, in turn, gave rise to a demand for an effective, good optical quality, easy processable but low cost material.

The basic relationships of electrochemical kinetics are identical with those of chemical kinetics. Electrochemical kinetics involves an additional parameter, the electrode potential, on which the rate of the electrode reaction depends. The rate of the electrode process is proportional to the current density at the studied electrode. As it is assumed that electrode reactions are, in general, reversible, i.e. that both the anodic and the opposite cathodic processes occur simultaneously at a given electrode, the current density depends on the rate of the oxidation (anodic) process, va, and of the reduction (cathodic) process, vC9 according to the relationship j = nF(va-vc) (5.2.1)

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Besides, the exibility in design is of high importance for applications, as the materials may be tuned to match speci c requirements, such as wavelength, combination with anisotropy, reversibility, long time, thermal and chemical stability, wetting/dewetting, and adhesion The existing functionalized polymers could not meet all these requirements, since the complicated synthesis is necessary for each material variation that limited the uptake of SRG for applications The use of the supramolecular approach to design azobenzene-containing materials capable of light-induced mass transport can both improve the understanding of the process and revolutionize its applications The photoinduction of optical anisotropy has been studied in a number of the supramolecular systems, as discussed in the previous part of the chapter On the contrary, the choice of the supramolecular systems, in which the formation of SRG has been reported, is rather restricted.

where n is the charge number of the electrode reaction appearing in the general equation 2 v/(r Red, < 2 v,.oOx, + ne (5.2.2)

254 The rates of the partial anodic and cathodic processes at a given electrode potential can often be expressed by the relationships

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