Vol 42, No 12 (2023)

The kinetics of the death of phenoxy radicals In• 2,6-diisobornyl-4-methylphenol (DBP) and
2,6-ditretbutyl-4-methylphenol (ionol) in toluene at 295 K is studied by EPR. The first-order effective rate
constants of the death of In• are determined: kef = 0.30 s–1 (I) and 8.4 × 10–3 s–1 for DBP and ionol, respectively.
Using the density functional theory, the mechanism of the death of In• is analyzed. It is found that the
phenoxy radicals of DBP are dimerized with the formation of the p-C,O-dimer, while In• ionol predominantly
forms the p,p-C,C-dimer. The dimers are in reversible equilibrium with phenoxy radicals, while the
irreversible consumption of In• occurs in the reaction of their disproportionation. Based on the density functional
theory (DFT) research and published data, it was found that the value kef = k/2K of DBP is higher due
to the much higher disproportionation rate constant of In•, although the equilibrium constant K of the
reversible dimerization of the phenoxy radicals of DBP is also higher than the equilibrium constant for In•
ionol.

The change in surface conductivity under the influence of hydrogen fluoride (HF) gas on quartz is
experimentally studied. It is shown that the surface conductivity of quartz changes by a factor of more than
108 during the reaction. Possible heterogeneous chemical processes determining the observed experimental
results are considered.

In the paper authors present original methods for analyzing the kinetic scheme and reaction rate
constants for calculation of the ignition delay time and the laminar velocity of the combustion wave for
C2H4–O2–Ar and C2H4-air mixtures. The kinetic scheme under consideration will further be applied in
problems of plasma-assisted combustion in a supersonic flow using a discharge. After made changes to the
reaction system, a good agreement between the calculation results and experimental data was obtained.

A model of the photocurrent generation of charge carriers in blends of donor (D) and acceptor (A)
materials structured on the nanoscale is considered. The absorption of a quantum of light in one of these
materials creates a molecular exciton, which can reach the interface between the D and A phases and form an
interfacial charge transfer (CT) exciton on this interface, which dissociates into an electron-hole pair. The
probabilities of the dissociation of CT excitons into free current carriers are calculated as a function of the
electric field and the thermalization length of the electron-hole pair.

A new composite based on succinyl chitosan (SCTZ) and silver nanoparticles (NPs) with the
inclusion of an additional component, polyethylene oxide (PEO), is developed. Microwave radiation and Dglucose
as a reducing agent are used to form silver NPs by reduction from metal ions. The presence of silver
NPs in the obtained colloidal solutions is judged by the appearance of absorption bands in the electron plasmon
resonance spectra ( max = 420 nm). It is shown that the introduction of an additional component in the
polymer matrix leads to a significant narrowing of the size range of the formed silver NPs.

interaction of cationic porphyrin with gold nanoparticles (GNPs) coated with polymer shells
with positive and negative surface potentials in an aqueous solution is studied. The criteria for the formation
of hybrid molecular-plasmon nanostructures based on the determination of the luminescence quenching
mechanism according to the Stern-Volmer equation and the change in the shape of the porphyrin luminescence
spectrum are established. The effect of the sign of the zeta potential of GNPs on the formation of hybrid
molecular-plasmon nanostructures due to electrostatic interaction is established.

The polymerization filling method is used to obtain nanocomposites based on ultrahigh molecular
weight polyethylene (UHMWPE) and graphene at with an ultralow content of 0.0065–0.019 vol %. The
melting points and degrees of crystallinity of the obtained composites are close to the corresponding characteristics
of unfilled UHMWPE. The strain-strength properties under the tension of the samples of the
obtained composites are studied depending on the content of graphene. It is shown that the tensile strength
of the composites increases significantly with an increase in the graphene content to 0.012 vol % compared
to unfilled UHMWPE with a subsequent decrease. The relative elongation changes in a similar way.

Some characteristic features of three scenarios for the occurrence and development of turbulence
are presented: the Landau-Hopf scenario, the scenario of transition to turbulence on a strange attractor, and
the scenario followed by the solutions of the multimoment hydrodynamics equations. The analysis of the presented
characteristic features allows us to conclude that these scenarios can be used to interpret turbulence.
It is shown that only one of the scenarios satisfactorily interprets the experimental data: the scenario followed
by the solutions of the multimoment hydrodynamics equations supplemented with stochastic components.
The Landau-Hopf scenario leads to a system that has lost stability in the wrong direction. The scenario of the
transition to turbulence on a strange attractor correctly reproduces only the initial stage of the evolution of
the liquid layer in the Bénard experiment, namely, heat transfer in the resting layer and convective shafts.
Analysis of the behavior of solutions of the Lorentz model leaves no hope for the ability of this scenario to
interpret turbulence