The molar heat capacity of the Lu2O3 ⋅ 2HfO2 solid solution has been determined at 4.5–347 K, and its thermodynamic functions have been calculated in the range 0–1300 K.
The molar heat capacity of the Lu2O3 ⋅ 2HfO2 solid solution has been determined at 4.5–347 K, and its thermodynamic functions have been calculated in the range 0–1300 K.
A new efficient method for the synthesis of soluble thermoplastic polymers of isoprene with softening points in the range from 73 to 160°C has been developed. The method consists in the cationic polymerization of isoprene in dichloromethane or toluene in the presence of catalytic systems based on triethylaluminum in combination with tert-butyl chloride, tert-butyl bromide, 2-chloro-2-methylbutane, or isopropyl chloride.
The temperature dependences of the molar heat capacity in the range 317–1377 K and the parameters of the monoclinic crystal lattice of M-terbium orthotantalate in the range 298–1273 K have been determined.
The effect of plane cold drawing on the mechanical characteristics of polypropylene during subsequent tension was studied. After the drawing, the yield stress was observed to decrease by about 30%. The true yield stress is described by a single curve as a function of the total axial elongation during the preliminary plane deformation and the subsequent tension.
The solution combustion synthesis of iron oxides from nitrate solutions with a dual fuel comprising urea and citric acid on the earlier synthesized FeOx powder was studied. The possibility of the synthesis of up to 100 g of the desired product under laboratory conditions in a relatively small (4 dm3) reactor was demonstrated for the first time. The obtained nanodisperse materials were a well-crystallized mixture of Fe3O4 and α-Fe2O3 oxides. A consistent increase in the weight of the FeOx powder led to an increase in the mass fraction of the α-Fe2O3 phase to 91% at the final stage of the synthesis.
For the first time, electrochemical synthesis of graphene-based particles with a specified morphology has been demonstrated. It has been revealed that parameters of the electrochemical synthesis make it possible to control the degree of oxidation and lateral size of graphene-based particles.
The paper presents the results on the rapid production of H2 from CH4 by its direct decomposition in a plasma-catalytic mode stimulated by microwave irradiation (MWI) at 600°C. Methane was passed through a bed of iron-containing carbon adsorbent obtained from gas coal characterized by a large dielectric loss tangent. Under MWI, intense breakdown effects with plasma generation appear on the surface of the iron–carbon system. Methane in the plasma converts to hydrogen and carbon. A method has been developed for the rapid regeneration of the catalyst by water vapor with the removal of carbon under microwave stimulation. Short-cycle experiments have shown that the catalytic system provides high conversions of methane and its almost complete regeneration.
Polyvinyl alcohol hydrogels with multifunctional cross-links—silica nanoparticles surface-modified with phenylboronic groups—have been fabricated. It has been demonstrated that such hydrogels exhibit pronounced viscoelastic properties, and their viscosity and elastic modulus are significantly higher than those for gels with single borate ion cross-links.
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：