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A continuous surface wetting transition, pinned to a solid-liquid-liquid-vapor tetra coexistence point, is studied by x-ray reflectivity in liquid Ga-Bi binary alloys. The short-range surface potential is determined from the measured temperature evolution of the wetting film. The thermal fluctuations are shown to be insufficient to induce a noticeable breakdown of mean-field behavior, expected in short-range-interacting systems due to their d(u) = 3 upper critical dimensionality. 相似文献
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Intersections of given maximal subgroups of finite groups are studied. General properties of the generalized Frattini subgroup
are established with the help of functorial methods. 相似文献
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The filling behavior of a room temperature solvent, perfluoromethylcyclohexane, in approximately 20 nm nanoporous alumina membranes was investigated in situ with small angle x-ray scattering. Adsorption in the pores was controlled reversibly by varying the chemical potential between the sample and a liquid reservoir via a thermal offset, DeltaT. The system exhibited a pronounced hysteretic capillary filling transition as liquid was condensed into the nanopores. These results are compared with Kelvin-Cohan theory, with a modified Derjaguin approximation, as well as with predictions by Cole and Saam. 相似文献
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V. M. Sysoev S. G. Shpyrko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(11):1873-1876
From the partition function of the two component system in the isobaric-isothermic (pressure) ensemble the expressions for
the chemical potential and activity of the mixture components are obtained. 相似文献
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O. A. Shpyrko 《Moscow University Mathematics Bulletin》2014,69(5):177-181
The notion of derived p-length of a finite p-soluble group is introduced and its elementary properties are described. New estimates of the derived p-length of a finite p-soluble group are obtained depending on the construction of Sylow p-subgroups. 相似文献
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Mechler S Pershan PS Yahel E Stoltz SE Shpyrko OG Lin B Meron M Sellner S 《Physical review letters》2010,105(18):186101
The structural and mechanical properties of 2D crystalline surface phases that form at the surface of liquid eutectic Au82Si18 are studied using synchrotron x-ray scattering over a large temperature range. In the vicinity of the eutectic temperature the surface consists of a 2D atomic bilayer crystalline phase that transforms into a 2D monolayer crystalline phase during heating. The latter phase eventually melts into a liquidlike surface on further heating. We demonstrate that the short wavelength capillary wave fluctuations are suppressed due to the bending rigidity of 2D crystalline phases. The corresponding reduction in the Debye-Waller factor allows for measured reflectivity to be explained in terms of an electron density profile that is consistent with the 2D surface crystals. 相似文献
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Atomic-scale surface demixing in a eutectic liquid BiSn alloy 总被引:1,自引:0,他引:1
Shpyrko OG Grigoriev AY Streitel R Pontoni D Pershan PS Deutsch M Ocko B Meron M Lin B 《Physical review letters》2005,95(10):106103
Resonant x-ray reflectivity of the surface of the liquid phase of the Bi(43)Sn(57) eutectic alloy reveals atomic-scale demixing extending over three near-surface atomic layers. Because of the absence of an underlying atomic lattice which typically defines adsorption in crystalline alloys, studies of adsorption in liquid alloys provide unique insight on interatomic interactions at the surface. The observed composition modulation could be accounted for quantitatively by the Defay-Prigogine and Strohl-King multilayer extensions of the single-layer Gibbs model, revealing a near-surface domination of the attractive Bi-Sn interaction over the entropy. 相似文献
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