Surface chemistry infrared

M. L. Hair, Infrared Spectroscopy in Surface Chemistry, Marcel Dekker, New York,... 

L. H. Little, Infrared Spectra of Adsorbed Molecules, Academic, New York, 1966. 68a. M. L. Hair, Infrared Spectroscopy in Surface Chemistry, Marcel Dekker, New... 

Adsorption phenomena from solutions onto sohd surfaces have been one of the important subjects in colloid and surface chemistry. Sophisticated application of adsorption has been demonstrated recently in the formation of self-assembhng monolayers and multilayers on various substrates [4,7], However, only a limited number of researchers have been devoted to the study of adsorption in binary hquid systems. The adsorption isotherm and colloidal stabihty measmement have been the main tools for these studies. The molecular level of characterization is needed to elucidate the phenomenon. We have employed the combination of smface forces measmement and Fomier transform infrared spectroscopy in attenuated total reflection (FTIR-ATR) to study the preferential (selective) adsorption of alcohol (methanol, ethanol, and propanol) onto glass surfaces from their binary mixtures with cyclohexane. Om studies have demonstrated the cluster formation of alcohol adsorbed on the surfaces and the long-range attraction associated with such adsorption. We may call these clusters macroclusters, because the thickness of the adsorbed alcohol layer is about 15 mn, which is quite large compared to the size of the alcohol. The following describes the results for the ethanol-cycohexane mixtures [10],... 

Hair, M. L. "Infrared Spectroscopy in Surface Chemistry" M. Dekker, New York 1967. 

Hair, M.L. "Infrared spectroscopy in surface chemistry" Arnold London 1967. 

Dodecacarbonyltriruthenium, surface chemistry, 35 207-209 infrared spectra, 35 241 as prescursor to surface complexes, 35 240-247... 

Hair, M.L., "Infrared Spectroscopy in Surface Chemistry." Dekker, New York, 1967. 

Vibrational spectra—Congresses. 2. Infrared spectrometry—Congresses. 3. Surface chemistry—Congresses. 

The broad scope of the problems discussed in this review emphasizes the flexibility of the infrared methods. Because of this flexibility, the direct and unambiguous nature of the spectral evidence, and the ease and rapidity with which information can be obtained, it is obvious that the study of surfaces by the infrared technique will play an important role in future developments in the field of surface chemistry. 

I nfrared (I R) Spectroscopy Infrared spectroscopy is the most widely used technique for studying the surface chemistry of heterogeneous catalysts [103], It can give information about the catalyst structure, as well as about the species adsorbed on the catalyst surface. By using probe molecules like CO, NO and NH3, information is obtained about the nature and environment of atoms and ions exposed on the surface. The method is based on the absorption, transmission, or reflection by a... 

Surface chemistry—Congresses. 2. Colloids—Congresses. 3. Infrared spectroscopy—Congresses. 4. Fourier transform... 

Sampling in surface-enhanced Raman and infrared spectroscopy is intimately linked to the optical enhancement induced by arrays and fractals of hot metal particles, primarily of silver and gold. The key to both techniques is preparation of the metal particles either in a suspension or as architectures on the surface of substrates. We will therefore detail the preparation and self-assembly methods used to obtain films, sols, and arrayed architectures coupled with the methods of adsorbing the species of interest on them to obtain optimal enhancement of the Raman and infrared signatures. Surface-enhanced Raman spectroscopy (SERS) has been more widely used and studied because of the relative ease of the sampling process and the ready availability of lasers in the visible range of the optical spectrum. Surface-enhanced infrared spectroscopy (SEIRA) using attenuated total reflection coupled to Fourier transform infrared spectroscopy, on the other hand, is an attractive alternative to SERS but has yet to be widely applied in analytical chemistry. 

In the current study, we tested the applicability of near infrared spectroscopy coupled with correlation analysis to quantitation of the dependence of montmorillonite spectra on two of the structural features known to be of importance in clay surface chemistry -hydration and exchangeable iron. These clays were... 

Adsorption (Chemical Engineering) Batch Processing Catalysis, Homogeneous Catalysis, Industrial Electrochemistry Infrared Spectroscopy Mossbauer Spectroscopy Nuclear Magnetic Resonance Raman Spectroscopy Scanning Electron Microscopy Surface Chemistry... 

In spite of the experimental difficulty of using infrared spectroscopy to study the surface structure of carbon, IR spectroscopic measurements (especially in the form of Fourier transform IR, FTIR) have brought to light important information on the changes in surface chemistry produced by oxidation and substitution reactions. As a result of the systematic FTIR studies of Starsinic et al. (1983), van Driel (1983) and others (see Zawadzky, 1989 Boehm, 1994), considerable progress has been made in the assignment of IR bands. 

The availability of pure rutile in a finely divided state has allowed progress to be made in the interpretation of adsorption isotherm and energy data. In particular, it has been possible to explain certain unusual features of the adsorptive properties of rutile in terms of its surface chemistry as characterized by infrared spectroscopy. 

The surface chemistry of zinc oxide is of particular interest in relation to its catalytic and photocatalytic properties. For example the (0001) hexagonal crystal plane appears to have a special role in the catalytic methanol-synthesis reaction (Bowker et al., 1983). The chemisorption of CO and dissociative chemisorption of H2 occur on the exposed Zn2+ cations Bolis et al. (1986) have found that the relative magnitude of this active area of ZnO was highly dependent on the nature of the precursor (oxalate, carbonate of Zn). Similar conclusions can be drawn from the infrared spectroscopic measurements of Chauvin et al. (1986). 

A wealth of detailed evidence on the nature of supported metals can readily be obtained from infrared characterization studies, but correct interpretation of much of this evidence is still far from clear. The surface chemistry of supported metals is generally very complex, and assertions as to the origins of various band shifts and the exact nature of adsorption sites should be taken with some caution at present. Clearly, however, better understanding of the complex nature of supported metal catalysts should contribute greatly to the development of more efficient catalysts for many important industrial processes and to more efficient pretreatment and regeneration procedures. 

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