Chitosan thin-films (medium molar mass) were produced from different concentration precursor solution and characterized regarding structure and water absorption capability. Films were obtained from direct dipping of glass slides previously functionalized into acid medium gels (self-assembly technique). Analysis of scanning electron and atomic force microscopy data revealed a film thickness of less than 25-30 nm with low dependence upon polymer concentration. All films were featured as a nano porous structure. The water affinity, however, varies exponentially (2ls) with the chitosan content. Comparison tests in buffer solution were also carried out pointing to different behavior from that found for water.
Chitosan; thin-film; hydrophilicity; natural polymer; self-assembly
