Electrophoretic deposition alumina layer

FIGURE 26 SEM image of a transverse section of an alumina layer produced by electrophoretic deposition from a dispersion on the basis of glycerol. (Adapted from Ref. [158] with permission from the Swiss Chemical Society). 

Figure 1.8 Crack deflection in an alumina-zirconia hybrid laminate. The layered structure was produced by electrophoretic deposition scanning electron micrograph. (Courtesy of P. Sarkar and P. S. Nicholson.)...

Similarly, catalyst coatings can be used to produce MSs via thin film gas phase deposition, with chemical (up to 10 pm thickness) and physical vapour deposition methods (< 1 pm) typically used to deposit metals and metal oxide thin-fihns. Other methods such as electrophoretic deposition of alumina, ZnO, Ce02 and Zr02 coating layers inside the microreactors are also used (Cybulski and Moulijn, 2006 Hessel et al., 2005c). 

Electrophoretic deposition is a colloidal process used to coat either aluminium or stainless steel [122]. Either adhesion layers or complete coatings can be achieved. To-date mainly alumina suspensions have been used for electrophoretic deposition. Wunsch et al. coated microchannels with alumina nanopartides dissolved in oxalic add and mixed with alumina gd or glycerol [124] 2-4 pm thick adhesion layers were formed. Fbdisdi et al. applied dectrophoretic predpitation of industrial catalyst powders at 100 V (dc) [140]. After 2 min a uniform deposition of the catalyst powder on the surface was achieved. 

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