Adsorbed film /layer ageing

As a rule, different types of oxide film will form simultaneously on metal electrodes for instance, porous phase layers on top of adsorbed layers. Often, aging processes occur in the oxide layers, which produce time-dependent changes in the properties or even transitions between different forms. 

Figure 12 Transmission electron microscopy study of protein desorption in icecream mix containing emulsifiers and hydrocolloids, (a) Immediately after homogenization the fat globules (0 are stabilized by adsorbed partially dissociated casein micelles (arrows), (b) During ageing the mix at 5°C, the previously adsorbed protein film is released in the form of coherent protein layers (arrows) into the water phase (w). (c) After mechanical treatment in the ice cream freezer, desorbed protein layers are seen more often in the water phase without association to fat giobules (arrows). From reference 48, courtesy of Dr. W.Buchheim, Kiel, Germany.

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