CHARACTERIZATION OF INTERFACIAL PHENOMENA OCCURRING DURING EXPOSURE OF A THIN COPPER FILM TO AN AQUEOUS SUSPENSION OF AN ACIDIC POLYSACCHARIDE

[摘要] A Fourier transform infrared spectrometer equipped with a cylindrical internal reflection element was used to sample the solid-liquid interface of a metallic copper film submerged in an aqueous acidic polysaccharide solution. The presence of a polysaccharide absorption band at 1050 cm-1 in a water-subtracted spectrum supported previous spectroscopic data indicating polymer accumulation at the surface of the film. Firm binding of the polysaccharide to the surface after a 17-day exposure period was demonstrated by the retention of the 1050-cm-1 absorption band in spectra obtained after gentle rinsing of the film surface with polymer-free water. The sampling technique also provided evidence which suggests that acidic polysaccharides, including the firmly bound exopolymers produced by adherent cells of a freshwater sediment bacterium, promoted deterioration of the copper film. Internal reflection Fourier transform infrared spectroscopy appeared to be a useful, nondestructive method to study the sorption of biomolecules to a solid metal surface submerged in an aqueous medium.

[发布日期] 1987-12-01