Coating selection

For practical reasons, the ideal array consists of the minimum number of sensors/coatings that can adequately represent the data. Thus, coatings exhibiting similar or redundant responses should be eliminated, and those exhibiting unique behavior retained. In terms of pattern-recognition analysis, a coating can 

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Cladding may be less expensive than selective electro deposition when coatings greater than 1 p.m of a noble metal are required, but may be more expensive than electro deposition for thinner coatings. Selective techniques are most easily used for sheet metal substrates that are to be machine stamped and formed into contacts. Clad noble metals are considerably more ductile (and less hard) than comparable electro deposits and, therefore, are better suited to forming operations. Contacts that are made into separate parts from rod by screw machining are usually coated on all exposed surfaces by barrel electroplating. 

A Pt catalyst was applied by dry and wet techniques. By means of sputtering using a mask process protecting parts of the microstructure, the micro channel bottom was coated selectively. In addition, an y-alumina layer was applied by the sol-gel technique. Initially, the whole micro structure was covered by such a layer. Then, photoresist was applied and patterned so that only the channel part remained covered. After removal of the exposed photoresist and unprotected y-alumina, only the channel bottom was coated with y-alumina. 

To coat selectively only at some sections of a channel network, outflow of solvent at other sections should be used to prevent them from being wetted by the chemical modification reagents [148,766]. 

Quite recently an entirely new process has become available in which specific areas of plastic components are coated selectively, a primer being applied usually by spraying. This gives a layer that can be metallized subsequently by conventional electroless deposition and so provide the adhering surface necessary for further processing. 

Each sensor in an array is designed with a different coating, with each coating selected to respond differently to the members of a set of analytes as described above. The resultant combination of responses should produce a unique finger-... 

Aestheties, eultural preferenees and tradition play a strong part in coating selection. For example, in Seandinavia full-bodied stains eontaining iron oxide pigment have been favoured (3-6 year maintenanee eyele). Stains have a higher... 

Cellulose butyrate contains the bulkier butyryl group these esters are more compatible and soluble than acetates, but are too soft for most coating applications. Cellulose esterified with blends of alkyl groups can provide many intermediate properties needed in coatings. Selection of the appropriate cellulose acetate butyrate [9004-36-8] (CAB) and cellulose acetate propionate [9004-39-f] (CAP) content must be based on specific application requirements. 

Progress continues to be made toward the development of practical vapor detection instruments using coated SAW sensors. This paper reviews some of the characteristics of these versatile devices and their current capabilities. Factors affecting sensor performance, such as temperature and coating selection, are considered in terms of the sensitivity and selectivity of the SAW device. Special attention is given to a 4-SAW array instrument that is able to "fingerprint" and identify a variety of chemical vapors. 

Chem. Descrip. Diethylene glycol monobutyl ether acetate CAS 124-17-4 EINECS/ELINCS 204-685-9 Uses Solvent in cosmetics, printing inks, high-bake enamels, esp. screen inks and coil coatings selective solvent in separation of alcohols and ketone coalescing aid in low-pH latex paints Features Very slow evaporation rate limited water sol. 

Storage Moisture-sensitive refrigerate store beiow 4 C handie and store under nitrogen Uses Reducing agent in electronic/chemical industry, prod, of printed circuit boards, electrodeless coatings selective reduction in organic synthesis, esp. aldehydes, ketones, and acid chlorides... 

Whereas widespread inhibition is important for some applications—such as in caulks, sealants, and coatings—selective inhibition is important for other applications such as the treatment of yeast infections and protection from unwanted bacteria... 

Figure 14. Phase-contrast micrographs of HUVEC (7 days after cell seeding) on a sample coated selectively with carbon for 20 min by photo-induced CVD through a contact mask (spot diameter 1.5 mm) [39].

In coatings selection, intended service conditions must be considered. To illustrate this point, consider the differences between service conditions for toy boats and for battleships. Table 10.3 shows the use of coating finish systems in various service conditions. 

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