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Surface spectroscopy general discussion

This book deals only with the chemistry of the mineral-water interface, and so at first glance, the book might appear to have a relatively narrow focus. However, the range of chemical and physical processes considered is actually quite broad, and the general and comprehensive nature of the topics makes this volume unique. The technical papers are organized into physical properties of the mineral-water interface adsorption ion exchange surface spectroscopy dissolution, precipitation, and solid solution formation and transformation reactions at the mineral-water interface. The introductory chapter presents an overview of recent research advances in each of these six areas and discusses important features of each technical paper. Several papers address the complex ways in which some processes are interrelated, for example, the effect of adsorption reactions on the catalysis of electron transfer reactions by mineral surfaces. [Pg.1]

In this chapter we describe some applications of inelastic neutron scattering in surface chemistry, more particularly in studies of catalysts and adsorbed species [1]. Our emphasis will be on the spectroscopy. The subject matter is arranged broadly according to the type of catalyst metals ( 7.3), oxides ( 7.4), zeolites and microporous materials ( 7.5) and sulfides ( 7.6) and, within each group, according to the reactant molecules. We start ( 7.1) with a general discussion of surface vibrations. [Pg.285]

This chapter has been organized by considering several aspects. An introduction concerning the relevance of the electronic properties and applications of the azamacrocycles related to surface phenomena as well as the general aspects and characteristics of the vibrational techniques, instruments and surfaces normally used in the study of the adsorbate-surface interaction. The vibrational enhanced Raman and infrared surface spectroscopies, along with the reflection-absorption infrared spectroscopy to the study of the interaction of several azamacrocycles with different metal surfaces are discussed. The analysis of the most recent publications concerning data on bands assignment, normal coordinate analysis, surface-enhanced Raman and infrared spectroscopies, reflection-absorption infrared spectra and theoretical calculations on models of the adsorbate-substrate interaction is performed. Finally, new trends about modified metal surfaces for surface-enhanced vibrational studies of new macrocycles and different molecular systems are commented. [Pg.725]

The characterisation of a stimulus responsive surface in general includes two aspects verification of the surface composition and evaluation of the materials response due to the presence of the stimulus. Although a variety of techifiques are available to characterise peptides and their stimulus-responsive properties in solution and in bulk, many of these are not compatible with surface-immobilised peptides. Hence, a common approach is to characterise the peptide material in solntion before attachment to the surface. UV-based turbidity measurements (Lee et al., 2(X)9 Nath Chilkoti, 2003 Teeuwen et al., 2009) and calorimetry (Barbosa et al., 2009) are used to determine the LCST of ELPs. The isomerisation of azobenzene can be studied with UV absorption, nuclear magnetic resonance spectroscopy, and high-performance Uqnid chromatography (Anemheimer et al., 2005 Hayashi et al., 2007), and CD is nsed to determine the presence of helices in a peptide (Minelli et al., 2013 Yasntomi et al., 2005). Non-solution-based methods that can be used to characterise responsive peptide surfaces will be discussed in more detail below. [Pg.85]

Selection rules for dipole scattering from surface-adatom symmetry configurations follow those for IR spectroscopy. Relevant discussion can be found in Ibach and Mills, and general references on symmetry, normal modes and selection rules in... [Pg.775]

In diatomic molecules such as N2, O2, and CO the valence electrons are located on the 5cr, Ijt and 2jt orbitals, as shown by Fig. 6.6. [Note that the 5cr level is below the Ijt level due to interaction with the 4cr level, which was not included in the figure.] In general, the Ijt level is filled and sufficiently low in energy that the interaction with a metal surface is primarily though the 5cr and 2jt orbitals. Note that the former is bonding and the latter antibonding for the molecule. We discuss the adsorption of CO on d metals. CO is the favorite test molecule of surface scientists, as it is stable and shows a rich chemistry upon adsorption that is conveniently tracked by vibrational spectroscopy. [Pg.250]


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See also in sourсe #XX -- [ Pg.9 ]




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