Biointerface Characterization by Advanced IR Spectroscopy by C.-M. Pradier, Y.J. Chabal PDF

Environmental Studies

By C.-M. Pradier, Y.J. Chabal

IR spectroscopy has turn into with none doubt a key strategy to resolution questions raised while learning the interplay of proteins or peptides with strong surfaces for a basic viewpoint in addition to for technological functions. precept, experimental set ups, parameters and interpretation ideas of numerous complicated IR-based thoughts; software to biointerface characterisation throughout the presentation of contemporary examples, might be given during this publication. it's going to describe the way to characterise amino acids, protein or bacterial pressure interactions with steel and oxide surfaces, by utilizing infrared spectroscopy, in vacuum, within the air or in an aqueous medium. effects will spotlight the performances and views of the process. Description of the foundations, expermental setups and parameter interpretation, and the speculation for numerous complex IR-based suggestions for interface characterisationContains examples which reveal the capability, power and bounds of the IR techniquesHelps discovering the main sufficient mode of analysisContains examplesContains a word list by means of options and by way of key terms

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Surf. Sci. 1996;368:303–309. [35] Barlow SM, Haq S, Raval R. Langmuir 2001;17:3292–3300. [36] Vallee A, Humblot V, Methivier C, Pradier C-M. Surf. Sci. 2008;602:2256–2263. [37] Vallee A, Humblot V, Methivier C, Pradier C-M. Surf. Interface Anal. 2008;40:395–399. [38] Vallee A, Humblot V, Methivier C, Pradier C-M. J. Phys. Chem. C 2009;113:9336–9344. [39] Humblot V, Methivier C, Pradier C-M. Langmuir 2006;22:3089–3096. [40] Greenler RG, Snider DR, Witt D, Sorbello RS. Surf. Sci. 1982;118:415–428.

The monolayer has two absorption bands: one with its transition moment parallel ðx; yÞ to the surface and the other with its transition moment perpendicular ðzÞ to the surface. Calculated behavior patterns of DS S versus angle of incidence are presented in Figure 1. The results in Figure 1 show that DS S values corresponding to ðx; yÞ- and ðzÞ-oriented transition moments have opposite signs, which switch when the incidence passes through the Brewster angle uB . Consequently, ðx; yÞ- and ðzÞ-oriented absorptions will   always have opposite signs on a PM-RRAS  spectrum.

Finally, it is important to note that this TO–LO splitting is also present in conventional IRRAS spectra of monolayers deposited on dielectric substrates when spectra are registered with a p-polarized electric field. On metallic substrates, the infrared beam produces an electric field perpendicular to the surface which only probes the LO component. As a consequence, the Amide I band of proteins detected with IRRAS or PM-IRRAS on metals are always located at higher frequency than the band obtained for the same protein with a direct absorption technique [13].

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