抄録
We have studied the control technology of the water sorption on the cellulose Langmuir-Blodgett (LB) films and the cellulose LB based quartz crystal oscillator (QCO) sensors by derived Sorption Model. We described our results of characterization for the cellulose LB films by using scanning probe microscopy (SPM), Fourier Transform-infrared (FT-IR) absorption spectroscopy, small-angle X-ray diffractometry (XRD) and high resolution transmission electron microscope (HR-TEM). We also described concisely the understanding and application of the cellulose and thin film; especially LB thin film advancement, gas adsorption on cellulose molecular field with special interest in water molecule, merit and necessity of QCO measurement. We clarified the sorption model including both Freundlich-type and Polanyi-type sorption. In the low relative humidity region the characteristics can be described by the Freundlich-isotherm, and show a linear dependence on the number of monolayers in the film. We interpret this as being due to the sorption of water into the cellulose LB monolayer plane, so that the Freundlich-type sorption mechanism determines the water sorption characteristics that predominate in this region. It is explained as sorption onto the hydrophilic sites in the glucose units in the monolayer. The resulting water sorption model was demonstrated that the possibility of the sorption control on the surface/ in the bulk of the cellulose Langmuir-Blodgett films.
