level about interaction forces and adsorption processes. If
The interactions between cellulose surfaces, between chitosanmeasurements using these techniques are to be successful, coated surfaces, and between one cellulose surface and one chitoa very smooth cellulose surface is needed.
san-coated surface have been studied using the interferometric
The first attempt to directly measure interactions between surface force apparatus (SFA). The cellulose surfaces were precellulose surfaces and between hemicellulose (xylan) surpared by depositing trimethylsilyl cellulose on hydrophobized mica faces was made by Neuman et al. (1). In this work spinusing the Langmuir-Blodgett technique. The surfaces were desilycoated cellulose surfaces were used, and it was concluded lated in a humid HCl atmosphere to obtain regenerated cellulose.
that the surfaces were weakly charged and that long cellulose ESCA measurements and wetting studies demonstrated that the tails extended into the solution. Interpretation of data was desilylation process was effective. Scanning force microscopy studies showed the cellulose surfaces to be smooth with a root-mean-hampered, however, by the relative large roughness and insquare roughness of 0.16 nm. Surface force and ellipsometry meastability of the spin-coated cellulose film.
surements illustrate that the cellulose film swells considerably in
A more reproducible cellulose surface can be obtained humid air and in water, suggesting that it is mostly amorphous. by using Langmuir-Blodgett (LB) films of trimethylsilyl The interaction between two cellulose surfaces is dominated by a cellulose (TMSC), which can be easily converted into resteric repulsion caused by a few dangling tails. On separation an generated cellulose. The technique was initially developed attractive force was present both between two cellulose surfaces by Schaub et al. (2), who were interested in ultrathin films and between one cellulose surface and one chitosan surface. The for sensor device applications, in optoelectronics, or as orienlong-range interaction between cellulose and chitosan was shown tation layers in the manufacture of liquid-crystal displays.
to be attractive.