Nanocrystalline coatings ceramic

Similar processes took place in the case of porous YSZ coating (powder and polymer ratio of 5 1). The only difference is the amount of nanocrystalline YSZ derived from the polymer was not sufficient to fill all space in the initial YSZ framework resulting a porous ceramic material with well-developed connection between particles (Figure 3-3c). This type of material cannot be used as an oxygen separation membrane because it has open porosity, but it can be useful as the YSZ skeleton for the electrodes, as it has high effective surface area for exchange with the gaseous phase. 

Figure 28.9 summarizes the capabilities of the various gas-phase synthesis methods that have been described. It is evident that all materials can be prepared by means of gas-phase synthesis in a nanocrystalline microstructure. For each case, it is necessary to determine whieh teehnique is most appropriate in terms of cleanliness of the powder surfaces, degree of agglomeration, particle size and distribution, phases, and quantities. In addition to single-phase materials, some of the techniques are also capable of synthesizing metal/metal, metal/ceramic, and ceramic/ceramic composites, as well as coated nanoparticles, potentially leading to interesting applications in the near future. 

Biomolecular Delivery Using Coated Nanocrystalline Ceramics (Aquasomes)... 

The synthetic product, a three layered composition comprised of the ceramic nanocrystalline core, the polyhyroxyloligomeric film coating, and the non-covalently bound layer of the drug/enzyme DNase, is shown in Figure 1. Typical spectrophotometric data for the first 200 seconds are shown in Figure 2. The free enzyme solution shows a typical time/absorption profile while the immobilized ... 

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