Low‐dimensional solid state structures in the form of a hexagonal network are particularly interesting for unveiling new physical properties of condensed matter and, moreover, due to their properties as photonic crystals. Besides the so far well‐established structuring with advanced lithographic methods, it is also possible to take advantage of self‐organization processes for the gain of those low‐dimensional structures. In the following paper, we introduce an experimental method that is capable of producing highly regular polymer network patterns on the basis of different cell types. The diameter of a hexagonal cell amounts to 1.5–2.0 μm. Our method is based on the wetting of a drop of the polymer solution (nitrocellulose in amyl acetate) on the surface of distilled water cooled down to a temperature of 3 to 5°C and the influence of the water vapor on the created polymer thin film. Following the self‐organized process of precipitating water vapor drops on the polymer layer, pulling the latter to the water drop, and subsequently evaporating the solvent, we end up with a structuring of the polymer thin film to a hexagonal network. Depending on the time elapsed after the water vapor has begun to affect the polymer layer, one obtains different forms of net structures. The size of the hexagonal cells results from the extension of the water vapor drop. We propose a structuring model capable of explaining the morphology of the individual cells inside the network obtained in the experiment.

Structural features of a number of xylan types (Sigma, Fluka) and that extracted by us from birch wood (BW) have been determined using IR transmission spectroscopy and elemental analysis. The calculated molecular formulas of Sigma and Fluka xylans are close to the theoretical molecular formula of a xylopyranose residue whereas the molecular formula of BW xylan differs from it. The investigated xylan samples contain both acetyl and methoxyl groups in small amounts. A somewhat higher content of acetyl groups is found in BW xylan compared to that in Sigma and Fluka xylans and it practically does not contain traces of lignin and phenolic alcohols whereas Sigma xylan includes large traces of lignin and glucuronic acids. IR spectra of the investigated samples suggest that the studied types of xylan have an identical system of hydrogen bonds.