A cell-model study on counterion fluctuations in macroionic systems: Effect of non-extensiveness in entropy

Yiing-Rei Chen, Chi Lun Lee*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

Rigorously speaking, entropy is slightly non-extensive, and this non-extensiveness, which characterizes the degree of fluctuations, can contribute to effective interactions between mesoscopic objects. In this paper, we consider a pair of macroions, each accompanied by 1000 counterions, and with a cell-model description we demonstrate that the slow variation of non-extensiveness in counterion entropy over macroionic distance leads to an effective long-range attraction between the macroions. With the aid of Monte Carlo simulation and a Bragg-Williams theory including counterion number fluctuations, we find the depth of attraction in free energy to be approximately 0.2kBT. The observation in our cell-model study provides an insight for further understanding of effective interactions in real macroionic systems.

原文英語
頁(從 - 到)297-303
頁數7
期刊Physical Chemistry Chemical Physics
16
發行號1
DOIs
出版狀態已發佈 - 2014 一月 7

ASJC Scopus subject areas

  • 物理與天文學 (全部)
  • 物理與理論化學

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