FTIR spectra properties

CNT-doped conducting polymers possess improved mechanical, chemical, and optical properties. They also provide a simple strategy for making aligned CNTs. The disappearance of the characteristic peaks of carbon nanotubes in the FTIR spectrum of polymer/CNT composite films is normally an indication of perfect enwrapping of CNTs with the deposited conducting polymer [162, 163], Zhang et al. [40] have studied the... 

Further properties of gephyrotoxin are presented in Table VIII. The proton magnetic resonance spectrum of gephyrotoxin has been presented (58,143). Proton and carbon-13 assignments for gephyrotoxin have been reported (144). The vapor-phase FTIR spectrum of gephyrotoxin is shown in Fig. 16. 

Properties XRD pattern, FTIR spectrum, TEM image available [387]. 

Apafill from Center of Biomaterials, University of Havana, Two Samples Properties FTIR spectrum available [349] see also Table 3.1749. 

Properties BET specilic surface area 17.7 rn /g, XRD pattern, SEM image, FTIR spectrum available [2540]. 

The type of interaction along the interface will exert a great influence on the various properties of the composite materials. Therefore, to improve the performance of a composite material, it is absolutely necessary to characterize the structures of the interface. Some of the methods for analysis of the interface are ESCA, AES, IR-FTIR, SIMS, and SEM, etc. At present, ESCA is widely used in the surface analysis of elements and the qualitative analysis of functional groups. Figure 11 shows the ESCA spectrum of polyethylene treated with... 

A six-coordinate iron atom in the model complex [Ph4P]2[Fe (PS3)(CO)(CN)j model compound was described by Hsu et al. (1997). Its spectral properties (Mossbauer and FTIR) showed similarities with those of the low-spin Fe site in the Ni-Fe active site of hydrogenases. Interestingly, the EPR spectrum of the oxidized compound had g values and line widths very much like the one of active, oxidized [Fe] hydrogenases (Hsu, H.F., Koch, S.A., Popescu, C.V., Miinck, E. and Albracht, S.P.J. as mentioned in Pierik et al. (1998a)), the structure of which was not known at the time. 

Because of the strong hydrolysis property of antimony salt, it is very difficult to prepare antimony xanthate salt to obtain its IR spectrums. Therefore, the formation of antimony xanthate is difficult to be identified by the UV and FTIR analysis, which has been determined by using XPS. Finally, it can be concluded that the interaction mechanism between ethyl xanthate and jamesonite are attributed to the formation of lead and antimony xanthate on the surface in the light of flotation results, voltammogram measurement, UV and FTIR as well as XPS analyses. 

We have applied the FTIR method to investigate the surface properties of NiO/Ni(100) films by following the adsorption of CO. A comparison of FTIR spectra of CO on various surfaces is shown in Figure 3. Figure 3a is a typical CO chemisorption spectrum on a clean Ni(lOO) surface at 300 K. The CO coverage of this surface is about 0.5 ML with all CO molecules occupying the terminal sites on clean Ni(lOO). The vibrational feature observed at 2032 cm-i can be easily assigned to the... 

The CO chemisorptive properties of the Pd loaded catalysts were studied by FTIR-in situ technique. Before the adsorption the samples were thermally treated at 673K for 30 min to remove the impurities and then the adsorption cell was cooled to 473K followed by CO adsorption. The IR spectrum was recorded after adsorption for lOmin. Afterwards, the temperature was reduced to 297K and the adsorption cell was evaluated. Before and after the evaluation, the IR spectra were also recorded. 

The properties of the dual-film electrode were characterized by in situ Fourier transform infrared (FTIR) reflection absorption spectroscopy [3]. The FTIR spectrometer used was a Shimadzu FTIR-8100M equipped with a wide-band mercury cadmium teluride (MCT) detector cooled with liquid nitrogen. In situ FTIR measurements were carried out in a spectroelectro-chemical cell in which the dual-film electrode was pushed against an IR transparent silicon window to form a thin layer of solution. A total of 100 interferometric scans was accumulated with the electrode polarized at a given potential. The potential was then shifted to the cathodic side, and a new spectrum with the same number of scans was assembled. The reference electrode used in this experiment was an Ag I AgCl I saturated KCl electrode. The IR spectra are represented as AR/R in the normalized form, where AR=R-R(E ), and R and R(E ) are the reflected intensity measured at a desired potential and a base potential, respectively. 

Following this route, catalysts with a large spectrum of properties resulted. Only silica embedded colloid catalysts exhibited excellent hydrogenation properties. Mixing the silica with a second oxide like tantalum led to support acid properties as resulted from NH3-FTIR measurements, which conferred to these catalysts bi-functional properties. Fig. 2 shows in-situ NH3-DRIFT spectra. The adsorption of NH3 is consistent with the formation of a new band at 1460 cm for SPT2, and 1440 cm for TSPT2 as a contribution of v(H-N-H) in adsorbed NH4. The bands at 3240, 3045, and 2840 cm result from the same contribution. The adsorption of NH3 also led to the disappearance of the band due to adsorbed water. These data indicated a Bronsted acidity only for tantalum containing catalysts. No Lewis acid sites were detected. 

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