Infrared pattern

Infrared patterns can lead to detection of lack of bonding between surface platings, between coatings and base metal, or within bra2ed honeycombs and other composite materials where bonding is vital. Mote recent developments involve infrared television or image tubes similar to the types used for night vision in military and other appHcations. 

U.S. Coast Guard R D Center, Proceedings of the Infrared Pattern Rec-... 

In the thermal decomposition studies of A, X, Y, and L zeolites, powder samples of each zeolite were heated in ambient air for 16 hours at increasing temperatures to yield a series of thermal decomposition products with successively lower residual zeolite x-ray crystallinity. The heated powders were hydrated at room temperature and run as KBr wafers to obtain their infrared patterns. 

Correlation of the infrared spectra with zeolite structure has led us to propose the following interpertations and hypotheses. Each zeolite species has a typical infrared pattern. In addition, there are often general... 

The effect of cation movement and framework distortion on the infrared pattern of a Ca-exchanged Y zeolite (Si/Al = 2.5) is shown in Figure 12. Dehydration and complete dehydroxylation of zeolites with similar cation composition and framework topology (e.g., Ca-exchanged... 

E. M. Flanigen You have raised a difficult point in our interpretation which we have considered and discussed in the paper. Our present feeling is that the internal tetrahedron vibrations are highly coupled, and that it is by reason of the large pore volume which isolates polyhedral units, such as the double four rings in zeolite A, that they can be seen as distinct entities. We propose that that is why, in the less open structures with higher densities and lower pore volumes, you do not see the same kind of general features in the infrared pattern as you do in the most open frameworks. 

The synthetic chains prepared by either route exhibited an identical behavior with the natural compounds when compared as to amino acid composition after acid and enzymatic hydrolysis, electrophoretic mobility on paper and thin layer electrophoresis at two pH values, specific rotation and infrared pattern. The amino acid analysis of acid and enzymatic (LAP leucine aminopeptidase) hydrolysates of the synthetic S-sulfonated sheep A chain is shown in Table I and of human A chain in Table II. As it can be seen from these tables the amino acid compositions of the synthetic chains expressed in molar ratios are in excellent agreement with theoretically expected values. Furthermore, complete digestibility of these chains by LAP establishes their stereochemical homogeneity. 

---