Fe@Au and Ni@Au core–shell nanoparticles (NPs) were synthesized by liquid-phase reduction of iron and nickel compounds by sodium borohydride in an aqueous medium. Transmission electron microscopy, X-ray powder diffraction, and spectrophotometry were used to confirm the structure of the NPs and to determine their shape and the average core and shell size. 相似文献
The extraction of copper(II) ions from ammonia solutions with a new β-diketone extractant, DX-510A, has been studied. Kinetic features of the copper(II) extraction and back extraction have been established: the reaction orders have been determined, and extraction and stripping rate constants have been calculated to be ke1 = 4.14 × 10–2 s–1 and kbe1 = 3.20 × 10–2 s–1, respectively. It has been demonstrated that the extraction of copper(II) ions is not accompanied by the coextraction of ammonia. The type of extracted complex has been determined and its formula has been suggested. 相似文献
Cobalt nanoparticles (3–7 nm in size) obtained by cobalt carbonyl decomposition in 1,2-dichlorobenzene in the presence of surfactants (trioctylphosphine oxide and oleic acid) have been studied by a complex of structural methods: small-angle X-ray scattering, electron diffraction, and transmission electron microscopy. The nanoparticles synthesized are found to consist of the cubic ε-Со phase; their crystal structure is described within the sp. gr. P4132, a = 6.097 Å. Using small-angle X-ray scattering, the size and shape of nanoparticles have been determined directly in the liquid dispersion. Most of the particles have a spherical shape; their average size is ≈3.5 ± 0.5 nm, which agrees with the electron microscopy data. Possible factors causing the ε-phase formation during synthesis of metallic Co nanoparticles are discussed.
For a model problem the solution to which describes the main features of changes in the parameters of the medium in the detonation
of an unconfined gas mixture charge of in the air, direct numerical simulation, without of simplifying assumptions on changes
in the composition of the mixture, was performed to study changes in the composition of the detonation products, determine
the limits of applicability of the chemical equilibrium mixture model, and verify a previously obtained sufficient condition
of applicability of the chemical equilibrium mixture model. The results of determining the limits of applicability of the
chemical equilibrium mixture model previously obtained using an approximate method were confirmed. 相似文献
Analytical expressions are derived and a computational algorithm and program for calculating distribution functions of rigid
spheres gij(r) necessary for calculations of the thermodynamic parameters of a binary fluid mixture are developed in the context of perturbation
theory using the procedure based on the inversion of the Laplace transform for functions rgij(r) obtained from the Percus–Yevick equation. 相似文献
Nanosized copper-containing particles stabilized on the surface of polymer nanograins were obtained by thermal decomposition of copper-containing precursors in a fluidized bed of ultradispersed polytetrafluoroethylene. Transmission electron microscopy showed that the average size of nanoparticles is 10–12 nm. The structure of the particles was determined by EXAFS, EPR, and X-ray powder diffraction. The copper nanoparticles consist of a core and a shell and are well structured. The core is copper metal, whereas the surface layer, which constitutes no more than 2% of the nanoparticle weight, is copper oxide. 相似文献
Using the method of mass-spectroscopic thermal analysis, it has been shown that when the surface of rutile is modified with n-butylamine and acetic acid, it is possible for the two substances to interact in the surface layer, with the result that the order in which the amine and the acid are adsorbed affects the structure of the resulting adsorbed layers. The chemisorbed layer on the surface of a sample of TiO2-AA-BA consists of molecules of both modifiers and the product of their surface reaction. Acetic acid adsorbed on TiO2-BA displaces the coordinatively bound amine molecules from the surfaces, leading to the formation of butylacetamide and the chemisorption of the acid molecules on unoccupied areas of the TiO2 surface.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 305–310, February, 1991. 相似文献
A single-electron molecular transistor is implemented at room temperature on the basis of a stable Langmuir monomolecular
film consisting of a mixture of stearic acid and carborane clusters. Control of the tunneling current with the aid of an independent
voltage source is recorded at room temperature. The results are compared with the “orthodox” theory of single-charge electronics.
Pis’ma Zh. éksp. Teor. Fiz. 64, No. 7, 510–514 (10 October 1996) 相似文献