The processes of structural rearrangement in a model membrane, i.e., an arachic acid monolayer formed on a colloidal solution of cerium dioxide or magnetite, are studied in situ in real time by the methods of X-ray standing waves and 2D diffraction. It is shown that the character of the interaction of nanoparticles with the monolayer is determined by their nature and sizes and depends on the conditions of nanoparticle synthesis. In particular, the structure formation in the monolayer–particle system is greatly affected by the stabilizer (citric acid), which is introduced into the colloidal solution during synthesis. 相似文献
DFT calculations and X-ray crystallography were used to directly compare the reactivity of the convex carbon surfaces of C(20)H(10)-corannulene and the C(60)-fullerene toward the diruthenium(i,i) metal cluster. 相似文献
Journal of Experimental and Theoretical Physics - We report on the results of experiments performed on the Iskra-5 laser facility for studying the effect of the polydeuteroethylene (CD2)n working... 相似文献
X-ray studies of dipalmitoylphosphatidylcholine (DPPC) single layers on the surface of a liquid provide detailed information on the interaction of metal particles with a single layer upon an increase in the surface pressure up to the collapse. Two complementary X-ray methods are used: grazing incidence diffraction and the X-ray standing waves method. The experimental results obtained for a single layer formed on a colloidal solution of magnetite nanoparticles reveal that the increase in the surface pressure is accompanied by an increase in the concentration of nanoparticles near the surface. In a series of experiments where metal particles of submicron size are sputtered onto a DPPC single layer, a sharp decrease in the intensity of the fluorescence yield from metal atoms is observed while the single layer is compressed. These data suggest that metal particles deposited onto the surface of a single layer were extruded into the aqueous subphase. 相似文献
The transition of the TiCu alloy from an amorphous state to the crystalline state has been studied by time-resolved X-ray diffraction. An analysis of the diffraction pattern has shown that the crystallization of the amorphous TiCu alloy upon heating occurs for a short time (no longer than 0.5 s). A sharp transition is observed at the instant of crystallization, at which the intensity of the total diffraction pattern background decreases and diffraction lines of the crystalline phase γ-TiCu arise. No intermediate crystalline phases are observed. The change in the alloy structure is accompanied by the exothermic thermal effect. The kinetics of the change in the total intensity of the diffraction spectrum in the period preceding the crystallization is nonmonotonic. Ten seconds before the occurrence of diffraction lines of the γ-TiCu phase at 300°C, the integrated spectral intensity decreases. The effect observed is related to the relaxation processes in the amorphous state and the onset of formation of long-range structural order. 相似文献
An N for Ir : The synthesis and X‐ray crystal structure of a late‐transition‐metal complex with a terminal nitrido ligand and its hydrogenation to the related amido complex are reported (see scheme).
A mathematical model for describing the quasi-isobaric filtration combustion of porous materials with the formation of condensed reaction products in a multicomponent gas is developed. Two-stage combustion waves (control modes) at the counter filtration of gas mixture are examined. The effect of inert gas component on the structure of a two-stage filtration combustion wave is studied, and the critical conditions of the changeover between filtration combustion modes caused by inert gas concentration variation are determined. It is demonstrated the characteristics of the two-stage combustion front propagating in the control mode in a multicomponent gas flow depends on the porosity of the heterogeneous system. 相似文献