论文标题
骆驼背形的柯克伍德 - 浅滩积分
Camel back shaped Kirkwood-Buff Integrals
论文作者
论文摘要
一些二元混合物，例如特定的酒精 - 烷烃混合物，甚至是水丁醇，都表现出两种驼峰骆驼后的KBI。这与具有单个极值的二元混合物的通常KBI形成鲜明对比。该极值被解释为最大浓度波动的区域，通常发生在具有明显的微隔离的二元混合物中，对应于混合物表现出两个物种结构域的渗透。在本文中，表明当一个物种形成“元粒子”聚集体时，两种极端混合物发生在二元混合物中，后者充当元物种，并且具有自身的浓度波动，因此其自身的KBI极限。这种“荟萃分泌物”发生在低浓度的骨料形成物种（例如烷烃中的酒精），并且与在中部体积分数占用率中观察到的其他普通极值独立。这些系统很好地说明了浓度波动与微分离之间的二元性概念。
Some binary mixtures, such as specific alcohol-alkane mixtures, or even water-tbutanol, exhibit two humps camel back shaped KBI. This is in sharp contrast with usual KBI of binary mixtures having a single extremum. This extremum is interpreted as the region of maximum concentration fluctuations, and usually occurs in binary mixtures presenting appreciable micro-segregation, and corresponds to where the mixture exhibit a percolation of the two species domains. In this paper, it is shown that two extrema occur in binary mixtures when one species forms "meta-particle" aggregates, the latter which act as a meta-species, and have their own concentration fluctuations, hence their own KBI extremum. This "meta-extremum" occurs at low concentration of the aggregate-forming species (such as alcohol in alkane), and is independant of the other usual extremum observed at mid volume fraction occupancy. These systems are a good illustration of the concept of the duality between concentration fluctuations and micro-segregation.
