Attenuated total reflection-Fourier transform infrared spectroscopy ATR-FTIR

Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), 24 111-114 Attenuation, 77 132-133 Attenuation length (AL), 24 87-89 Attrition, catalyst deactivation mechanism, 5 256t... 

Aspartic peptidases, 365 Atmospheric pressure chemical ionization (APCI), used with LC/MS ATR-FTIR. see Attenuated total reflection Attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), trans fatty acids, 505-511 Autoxidation. see also Oxidation discussed, 535 of lipids, 558, 627 prevention of, 558... 

Regarding the spatial aspects of the enzymatic degradation of CA-g-PLLA, a surface characterization [30] was carried out for melt-molded films by atomic force microscopy (AFM) and attenuated total-reflection Fourier-transform infrared spectroscopy (ATR-FTIR) before and after the hydrolysis test with proteinase K. As exemplified in Fig. 3 for a copolymer of MS = 22, the AFM study showed that hydrolysis for a few weeks caused a transformation of the original smooth surface of the test specimen (Fig. 3a) into a more undulated surface with a number of protuberances of 50-300 nm in height and less than a few micrometers in width (Fig. 3b). The ATR-FTIR measurements proved a selective release of lactyl units in the surface region of the hydrolyzed films, and the absorption intensity data monitored as a function of time was explicable in accordance with the AFM result. 

Characterization. The PPNVP and PPNVP/PEUU films were characterized by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), electron spectroscopy for chemical analysis (ESCA), ellipsometry, and water contact angles in air. Two independent methods, a modification of the radioimmunoassay used by Ziats, et. al. (14) and an immunochemical stain based on the ABC immunohistochemical staining method (15) were developed to assay the binding of GOx to the PPNVP/PEUU support. 

In this section we discuss a method of controlled material degradation for individual organic semiconductors and also for the blends used in bulk heterojunction solar cells [37]. The degradation is studied using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and by determining current/voltage characteristics (I/V measurements) of the devices. 

Surface analytical techniques. A variety of spectroscopic methods have been used to characterize the nature of adsorbed species at the solid-water interface in natural and experimental systems (Brown et al, 1999). Surface spectroscopy techniques such as extended X-ray absorption fine structure spectroscopy (EXAFS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) have been used to characterize complexes of fission products, thorium, uranium, plutonium, and uranium sorbed onto silicates, goethite, clays, and microbes (Chisholm-Brause et al, 1992, 1994 Dent et al, 1992 Combes et al, 1992 Bargar et al, 2000 Brown and Sturchio, 2002). A recent overview of the theory and applications of synchrotron radiation to the analysis of the surfaces of soils, amorphous materials, rocks, and organic matter in low-temperature geochemistry and environmental science can be found in Fenter et al (2002). 

The state of water in a membrane can become important for RO membranes as it is often related to rejection. Murphy and dePinho (1995) studied the state of water in RO and UF membrane active layers using attenuated total reflection fourier transform infrared spectroscopy (ATR-FTIR). Water content increased with porosity, and the strucmre of the water was dependent on average pore size. Large clusters of water were linked to low salt rejection, whereas low association of water in clusters indicated a low permeability to salt. 

Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR)... 

San Francisco, Ca. 3rd-6th Nov.1996, p.521-33. 6A1 ATTENUATED TOTAL REFLECTION FOURIER TRANSFORM INFRARED SPECTROSCOPY (ATR FTIR) USEFUL TOOL FOR MOLECULAR ANALYSIS OF ADHESIVES, SEALANTS AND COATINGS Ishida H... 

The stmctural and conformational analysis of proteins adsorbed to solid surfaces is difficult because most common analytical methods are not compatible with the presence of the interacting solids. With recent developments in instrumentation and techniques, our understanding of protein adsorption behavior has improved considerably [4, 14]. The most commonly used techniques include attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), radiolabeling techniques, immunofluorescence enzyme-linked immunosorbent assay (ELISA), ellipsometry, circular dichroism (CD) spectroscopy, surface plasmon resonance (SPR), and amide HX with nuclear magnetic resonance (NMR). Atomic force microscopy (AFM) and scanning... 

The effect of metal-ion concentration on the stoichiometry of surface complexes was studied by in situ attenuated total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) spectroscopy, monitoring the binding of Cd + to a carboxylate-terminated SAM [29]. Specific... 

A less technically complicated approach for tracking the surface dehydration ability of proteins and polymers is by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Accordingly, a solution of a surface binding solute is pumped into a flow cell with a Zn-Se crystal sensor, where it is irradiated with IR light and reflected to a detector. The surface chemistry and area of the sensor are specified and the surface area increased using different types of nanobeads (50 nm in diameter). 

A SIA system with attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) detection has been studied for sugar and organic acid analysis of Belgian tomato samples (Vermeir et al., 2009). Prediction models for D-glucose, D-fructose, citric acid, and L-glutamic acid concentrations in tomato samples were successful. 

Several spectroscopic techniques have been apphed to determine surfactants in cosmetics with different aims conventional infrared spectroscopy (IR) and nuclear magnetic resonance (NMR) for qualitative analysis near infrared spectroscopy (NIR) and attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR) for quantitative analysis atomic absorption spectroscopy (AAS) to determine specific surfactants. Mass... 

The crystalline structure of fibrous web was characterized by XRD and attenuated total reflectance fourier transform infrared spectroscopy (ATR-FTIR) spectra as shown in Figures 8.9. 

In this work, researchers employed attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) (Figure 4.6) analysis to support their posmlation on UV-initiated grafting. In their proposed mechanism, the grafting process of the PES membrane started with the absorption of UV-light by phenoxy phenyl sulfone chromophores in the backbone of the polymer chain. Two radical sites were produced at the end of each polymer chains as a result of hemolytic cleavage of carbon-sulfur bond (in sulfone linkage). The produced radicals (aryl and sulfonyl) thus induced the polymerization of acrylic acid at the reactive sites of the radicals. Sulfonyl radical... 

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