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北美退伍军人节(Veterans Day),12 日无更新
arXiv 0903.1847cond-mat.soft
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二元带电胶体悬浮液有效相互作用的非加和性

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Allahyarov Löwen

摘要:

基于原始模型的计算机模拟与显式微离子,我们计算的有效相互作用的二元混合物的带电胶体物种$A$和$B$为不同的大小和电荷比。通过对多体有效力的拟合,得到了最优的两两相互作用。该相互作用接近Yukawa(或Derjaguin-Landau-Verwey-Overbeek(DLVO))对势,但$AB$交叉相互作用与两个直接$AA$和$BB$相互作用的几何平均值不同。作为电荷不对称性的函数,相应的非加性参数首先是正的,然后显著地变负,然后再变正。最后,我们表明,列入非加性内的最佳有效汤川模型提供了更好的预测流体对结构比DLVO理论。

英文摘要:

Based on primitive model computer simulations with explicit microions, we calculate the effective interactions in a binary mixture of charged colloids with species $A$ and $B$ for different size and charge ratios. An optimal pairwise interaction is obtained by fitting the many-body effective forces. This interaction is close to a Yukawa (or Derjaguin-Landau-Verwey-Overbeek(DLVO)) pair potential but the $AB$ cross-interaction is different from the geometric mean of the two direct $AA$ and $BB$ interactions. As a function of charge asymmetry, the corresponding nonadditivity parameter is first positive, then getting significantly negative and is getting then positive again. We finally show that an inclusion of nonadditivity within an optimal effective Yukawa model gives better predictions for the fluid pair structure than DLVO-theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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