期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 30, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aaa3ac
关键词
screening; underscreening; ionic liquids; mean spherical approximation; fluctuation theory; response functions
An attempt is made to understand the underscreening effect, observed in concentrated electrolyte solutions or melts, on the basis of simple, admittedly crude models involving charged (for the ions) and neutral (for the solvent molecules) hard spheres. The thermodynamic and structural properties of these 'primitive' and 'semi-primitive' models are calculated within mean spherical approximation, which provides the basic input required to determine the partial density response functions. The screening length lambda(S), which is unambiguously defined in terms of the wave-number-dependent response functions, exhibits a cross-over from a low density, Debye-like regime, to a regime where lambda(S) increases with density beyond a critical density at which the Debye length lambda(D) becomes comparable to the ion diameter. In this high density regime the ratio lambda(S)/lambda(D) increases according to a power law, in qualitative agreement with experimental measurements, albeit at a much slower rate.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据