To verify Russian wines with protected designations of origin, the NRC “Kurchatov Institute” is creating a database of digital spectra of different varietal and geographical origins. The development of a digital algorithm for comparing the wine being tested with samples in the database is particularly important in the verification process. This article describes an algorithm for classifying single-varietal wines by varietal affiliation based on liquid chromatography. The algorithm was developed and tested using four red wine varieties (125 samples in total) and four white wine varieties (129 samples in total) produced in the Russian Federation. Testing showed an accuracy of over 80
The self-assembly of sector-shaped dendrons based on 3,6-di(decyloxybenzyloxy) benzoate attached to the optically active isomer of the dipeptide L-Tyr-L-Ala or D-Tyr-D-Ala in hexane solutions was studied using small-angle X-ray scattering. Optically pure isomers were shown to form extended cylindrical supramolecular aggregates, similar in structure to aggregates of the columnar phase in the block state. Meanwhile, in racemic mixtures of such compounds, the formation of dimers is observed, blocking further self-assembly.
A method is proposed for the synthesis of new supramolecular structures of polyrotaxane type, comprising nanotubes formed on the basis of crosslinked α-cyclodextrin and polyethylenimine as the core. It is shown that the obtained copolymers are capable of forming interpolymer complexes with DNA and may be of interest for the development of novel nonviral gene therapy agents.
Arrays of iron nanowires (NWs) obtained by electrodeposition in the track pores of polymer membranes with pore diameters from 30 to 600 nm have been studied by X-ray diffraction, scanning electron microscopy (SEM), as well as nuclear gamma-ray resonance (Mössbauer) and nuclear magnetic resonance (NMR) spectroscopy on 57Fe nuclei in zero external magnetic field at temperatures of T = 4.2 and 295 K. The same methods were also used to study control samples—a continuous layer of iron electrodeposited under the same conditions as NWs, and commercial polycrystalline α-iron. The Mössbauer measurements revealed similar macroscopic spontaneous magnetization in all iron NWs samples, mainly oriented along the axis of the wire, as well as in a sample of a continuous electrodeposited iron layer, oriented normally to the layer surface. NMR measurements at T = 4.2 K showed that, compared with the spectrum of the bulk α-Fe sample, the NMR spectral lines for all NW array samples exhibit similar significant broadening and a shift of the maximum toward a higher frequency, the values of which are practically independent of the NW diameter. Thus, it was found that at T = 4.2 K in iron NWs with macroscopic spontaneous magnetization, the hyperfine magnetic field Hhf on 57Fe nuclei is higher than in bulk polycrystalline iron.
Nonwoven microfibrous materials were produced by melt electrospinning from two polyolefin polymers with different mechanical properties: a “traditional” thermoplastic (polypropylene) and a thermoplastic elastomer (ethylene-octene copolymer). The electrospinning parameters were optimized to ensure the production of materials from both polymers with the most similar characteristics—the diameter and morphology of the fibers (3.5–4 μm), as well as their packing density in the nonwoven fabric (8–9
