狭缝中非对称轮廓与标准预湿线的相关性
Correlation between asymmetric profiles in slits and standard prewetting lines
摘要：
采用密度泛函理论研究了Ar在Li衬底上的吸附。这种方法在从三相点T_t到临界点T_c的整个温度T范围内对液-汽界面的表面张力都得到了很好的结果。在单一的平面壁和狭缝的几何形状的情况下的吸附质的行为进行了分析作为温度的函数。本文研究了由两个相同的平面壁构成的狭缝中流体的非对称密度分布，并由此产生了自发对称性破缺（SSB）效应。我们发现，在平均密度rho*_ssb1 <= rho*_av <= rho*_ssb2的范围内，即使在润湿温度T_w以上也会出现不对称溶液，这种不对称溶液随着温度的升高而减小，直到在临界预润湿点T_cpw处消失。以这种方式的SSB效应的消失和预湿线的一端观察到的单壁平面基板上的吸附之间的相关性建立。此外，它示出的T_cpw的值可以通过分析的不对称系数精确地确定。
英文摘要：
The adsorption of Ar on substrates of Li is investigated within the framework of a density functional theory which includes an effective pair potential recently proposed. This approach yields good results for the surface tension of the liquid-vapor interface over the entire range of temperatures, T, from the triple point, T_t, to the critical point, T_c. The behavior of the adsorbate in the cases of a single planar wall and a slit geometry is analyzed as a function of temperature. Asymmetric density profiles are found for fluid confined in a slit built up of two identical planar walls leading to the spontaneous symmetry breaking (SSB) effect. We found that the asymmetric solutions occur even above the wetting temperature T_w in a range of average densities rho*_ssb1 <= rho*_av <= rho*_ssb2, which diminishes with increasing temperatures until its disappearance at the critical prewetting point T_cpw. In this way a correlation between the disappearance of the SSB effect and the end of prewetting lines observed in the adsorption on a one-wall planar substrate is established. In addition, it is shown that a value for T_cpw can be precisely determined by analyzing the asymmetry coefficients.
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