tailieunhanh - INTERFACIAL AND CONFINED WATER Part 4

Chúng tôi mong đợi rằng B1 biên độ của hạn từ hàng đầu trong phương trình (13) không nên phụ thuộc vào khả năng tương tác bề mặt nước, ít nhất là trong xấp xỉ đầu tiên. | 86 Interfacial and confined water We would expect that the amplitude B1 of the leading singular term in equation 13 should not depend on the water-surface interaction potential at least in the first approximation. This term arises from the bulk order parameter whose amplitude Bo is determined by the water-water interaction only. Therefore we believe that the water-water interaction gives a major contribution to the amplitude B1. In contrast the parameters of the asymmetric terms in equation 13 should strongly depend on the water-surface interaction. In particular pc in the surface layer is essentially below the bulk critical density when a weak fluid-wall interaction provides preferential adsorption of voids whereas pc may exceed the bulk critical density in the case of a strong water-surface interaction. It is difficult to predict the values of the temperature-dependent terms in the asymmetric contribution as the surface diameter reflects interplay between the natural asymmetry of liquid and vapor phases described by the bulk diameter and preferential adsorption of one of the component molecules or voids . The temperature behavior of the local water densities near the surface described by equation 13 intrudes into the bulk with approaching critical temperature. It was found that the surface behavior of the symmetric part order parameter spreads over the distance about 2 from the surface. Temperature crossover of the asymmetric contribution from bulk to surface behavior needs to be studied. Although both the missing neighbor effect and the effect of the short-range water-surface interaction decay exponentially when moving away from the surface the effective correlation lengths or and amplitudes of two effects in general may be different. Approaching the bulk critical temperature symmetric contribution vanishes whereas the asymmetric contribution remains finite at T Tc. In this sense one may speculate that the asymmetric contributions dominate the density profile of

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