Spectrum FTIR

I would like to thank Professor B. van der Veken for the improved FTIR spectrum in Figure 6.8. 

Figure 1 The FTIR spectrum of the oxide of siiicon (thin film deposited by CVD). Primery...

Figure 2 Spectral parameters typically used in band shape analysis of an FTIR spectrum peak position, integrated peak area, and FWHM.

Figure 3 Typical beam path configuration for collecting an FTIR spectrum using an attenuated total reflectance element Iq is the incident infrared beam, f is the exiting beam.

The Fourier Trairsform Infrared (FTIR) spectrum obtained from non-adapted tomato cell walls is very similar to that from the onion parenchyma cell wall (both contain cellulose, xyloglucan and pectin) although there is more protein in the tomato walls (amide stretches at 1550 and 1650 cm-i) (Fig 4). In DCB-adapted tomato cell walls, the spectrum more closely resembles that of either purified pectins or of a commercial polygalacturonic acid sample from Sigma with peaks in common at 1140, 1095, 1070, 1015 and 950 cm-t in the carbohydrate region of the spectrum as well as the free acid stretches at 1600 and 1414 cm-i and an ester peak at 1725 cm-k An ester band at 1740 cm-i is evident in both onion parenchyma and non-adapted tomato cell wall samples. It is possible that this shift in the ester peak simply reflects the different local molecular environment of this bond, but it is also possible that a different ester is made in the DCB-adapted cell walls, as phenolic esters absorb around 1720 cm-i whilst carboxylic esters absorb at 1740 cm-k The... 

Transmission/wavenumber (cm) Figure D 8. FTIR spectrum of cyclosarin - GF... 

Since the ketene will copolymerize with cyclopropanone, excess ketene was removed by addition of 3A molecular sieves followed by evacuation at 1 mm Hg for 2-3 hours at -70°C. The amount of ketene was monitored by FTIR analysis. Ketene has a distinct strong absorption between 2130 and 2150 cm-1 (5,6). The solution FTIR spectrum of cyclopropanone in Figure 1 was taken before ketene removal. 

Figure 1 FTIR spectrum of a diethyl ether solution of...

Figure 2 FTIR spectrum of a thin film of polycyclopropanone.

Figure 4. Infrared (FTIR) spectrum obtained after deposition...

Figure 2. FTIR spectrum of poly(t-butyl styrene)-b-poly(t-butyl methacrylate) (10% TBMA by weight).

Figure 5 ATR-corrected FTIR spectrum of the white residue that resides in the tiny defects shown in Figure 4.

Figure 6 The top five spectral database matches to the ATR-FTIR spectrum acquired from the white powder inside the defects.

Figure 11 shows the ATR-FTIR spectrum acquired from the surface of the white-colored paint sample after the paint had been dried. Figure 12 shows the closest spectral library database matches obtained Figure 13 compares the spectrum of the surface of the white-colored paint sample with that of a reference library spectrum of a vinyl toluene-modified alkyd. The binder from the dried... 

Figure 11 ATR-FTIR spectrum of the dried white-colored paint sample. 

Table 7 shows the calculated weight percent of calcium carbonate and titanium dioxide in the white-colored paint sample. These levels are based on the calcium and titanium levels shown in Table 6. Calcium carbonate was evident by the FTIR spectrum acquired from the dried paint sample, shown in Figure 13. (Flad it been available, Raman spectroscopy, which gives ready access to the low wavenumber region, could have been used to confirm the presence (and polymorphic form) of titanium dioxide [4].) Given the white color of the paint, it is likely that the titanium present was present as titanium dioxide, and this was assumed in the calculations. The calculated weight percentage of calcium carbonate in the dried paint is 21.7 wt%, and 12.6 wt% in the paint containing the solvents. The titanium dioxide levels were calculated to be 30.6 and 17.7 wt% in the dried and solvent-containing paint sample, respectively.

The FTIR spectrum for the dried paint resin does have a reasonable match score to and feature bands characteristic of an alkyd resin [5]. Due to the presence of fillers though, the spectral analysis did not allow for a high-quality match to be obtained. Removal of the fillers and subsequent FTIR analysis would provide the best spectroscopic result for the identification of the alkyd type and provide a better comparison to such as the reference vinyl toluene-modified alkyd. 

Figure 23 Top spectrum, ATR-FTIR spectrum from the outside film surface of the dispensing bag. Also displayed are the three best matches from a library search of the top spectrum.

Figures 61 and 62 show the ATR-FTIR spectra recorded from areas C and D, respectively, from the cross-section of catheter sample 2. The infrared spectra from both areas, C and D, are spectrally matched closest by a library spectrum of a polyethylene. (Both the recorded spectra show weak additional absorption bands in the region 1,700-1,500 cm-1.) The ATR-FTIR spectrum recorded from...

Figure 67 ATR-FTIR spectrum of the outside (back) surface of the white backing film of the good package sample. 

Figure 69 ATR-FTIR spectrum of the heat seal surface of the good white film (top), the heat seal surface of the bad white film (middle), and the library spectrum of an ethylene/ vinyl acetate copolymer (bottom). 

The ATR-FTIR spectrum of the middle opaque polyethylene layer of the "bad" sample is shown in Figure 70. This spectrum was acquired from the fracture surface where the outer polyester film and tie layer delaminated from the polyethylene layer. The highest-scoring library match in Figure 70 indicates that the middle layer is a polyethylene with a low branch content, most likely a HDPE or a LLDPE, although a much more detailed spectral analysis would be required to confirm this. 

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