Fiber surface DRIFTS

Showed that carbon in the surface or skin [12] consists of carbide (51%) carbon (41%) and carbonate (8%). Infrared depth profiling by diffuse reflectance infrared spectroscopy (DRIFT) provided further important insights [52], It showed that carbon alters the oxygen environment of the aluminum atoms near the fiber surface from octahedral to tetrahedral coordination and promotes the generation of carbonaceous species such as ethers and esters in addition to carbonates and carbides [52] which have also been found with XPS [12],... 

D. Pasquini, M. N. Belgacem, A. Gandini, and A. A. D. Curvelo, Surface esterification of cellulose fibers Characterization by DRIFT and contact angle measurements, J. Colloid Interface Set, 295 (2006) 79-83. 

The infiuence of supported Au particles on the photoconversion of NO2 has been investigated by simultaneous detection of gas phase and surface species using DRIFTS by Ramakrishnan et al. [24]. The nanosized Au-supported catalyst was prepared by deposition of pre-prepared Au nanoparticle precursor solution onto titania. The catalysts were illuminated in the in situ reaction chamber by a 365 nm 50 mW LED UV source coupled with fiber optics while simultaneously collecting the diffuse reflectance spectra. Adsorption of NO2 is negligible in dark however, new absorption bands arose between 1200 and 1800 cm after starting illumination of the catalyst (Figure 4.1). The band intensities observed with Au-supported catalysts increase markedly with N O2 photocatalytic conversion in the quadrupled gas phase. Marked increase of activity has also been confirmed for the photooxidation of phenol in parallel batch experiments. 

The DRIFTS method was used for studying the surface of polymer fibers, including wood fibers [717-720] and powdered cellulose [721, 722], A nanometer-range sensitivity was demonstrated in the detection of organic... 

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