卷 484, 编号 1 (2019)

The method of synthesis of nanoscaled sodium dodecahydro-closo-dodecaborate Na₂[B₁₂H₁₂] is presented. The desired product has been prepared by heating to 200°C the composite formed by the introduction of the triethylammonium salt [Et₃NH]₂[B₁₂H₁₂] into the silicate matrix of sodium liquid glass. The morphology and phase composition of the synthesized sample have been studied by SEM and X-ray diffraction methods in comparison with regular Na₂[B₁₂H₁₂] salt. According to the obtained data, the sample under study is an amorphous composite, on the surface of which nanoscale crystals of Na₂[B₁₂H₁₂] are formed.

The interaction of tri-n-butylmethylphosphonium dimethyl phosphate and 1,3-dimethylimidazolium dimethyl phosphate with elemental sulfur in a benzene medium has been described. According to ¹³C and ¹⁷O NMR and high-resolution mass spectrometry, the chemical reaction involves only the dimethyl phosphate anion. The reaction mechanism and the reaction product composition have been proposed.

Single-phase complex oxides Nd_2 – yCa_yCo_xNi_1 – xO₄ have been synthesized for the first time. Composites prepared by the reduction of these compounds with hydrogen and containing Nd₂O₃, CaO, and cobalt and nickels metals have been used for the first time as catalysts of the partial oxidation of methane. The maximal methane conversions (97%) and syngas yields (96%) at 900°С have been detected in the presence of the composite obtained from Nd_1.5Ca_0.5NiO₄. At T < 850°C, the nickel–cobalt composite synthesized from Nd_1.3Ca_0.7Co_0.4Ni_0.6O₄ turned out to be more selective in the formation of syngas. Decreasing the partial oxidation temperature from 900 to 750°С leads to the oxidation of metallic nickel and cobalt to oxides and to partial resynthesis of complex oxides with perovskite and K₂NiF₄ structures. The observed differences in temperature dependence of the catalytic properties of composites with various Ni/Co ratios can be associated with the participation of complex oxides in catalysis of the partial oxidation of methane at low temperatures.

The nickel formate decomposition in an argon flow at 209°C with subsequent treatment of the obtained nanopowder in a hydrogen flow for a given time was shown to enable one to control the pyrophoricity and average size of Ni nanoparticles.

A methodology was proposed to develop an original computer-aided multiagent model of chemicophysiological processes in the human gastrointestinal tract (GIT) as a complex living biochemical system (LBCS), which simulates chemicophysiological processes of interaction of biologically active parts and organs of GIT in models of intelligent organoid agents. The model vividly represents chemicophysiological processes of the complex LBCS as a whole and also predicts its viability and homeostasis in cases of various physiological and biochemical external actions, internal abnormalities, and malfunctioning of GIT organs.