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arXiv 1006.3264cond-mat.softcond-mat.dis-nn
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二维偶极粒子二元混合物的玻璃化转变

Glass transition of binary mixtures of dipolar particles in two dimensions

David Hajnal, Martin Oettel, Rolf Schilling

摘要:

我们研究了偶极粒子的二元混合物在两个维度的模式耦合理论的框架内的玻璃化转变,特别是侧重于组成变化的影响。在第一步中,我们证明了König等人的实验系统[Eur. Phys. J. E 18,287(2005)]通过实验部分结构因子与我们的蒙特卡罗模拟的部分结构因子之间的比较,可以用点偶极很好地描述。对于这样的混合物的点粒子,我们表明,总是有一个塑化效果,即由于混合的液体状态的稳定,在对比二进制硬盘。我们表明,预测的塑化效果与实验结果定性一致。此外,还讨论了玻璃化转变线的一些一般性质。

英文摘要:

We study the glass transition of binary mixtures of dipolar particles in two dimensions within the framework of mode-coupling theory, focusing in particular on the influence of composition changes. In a first step, we demonstrate that the experimental system of König et al. [Eur. Phys. J. E 18, 287 (2005)] is well described by point dipoles through a comparison between the experimental partial structure factors and those from our Monte Carlo simulation. For such a mixture of point particles we show that there is always a plasticization effect, i.e. a stabilization of the liquid state due to mixing, in contrast to binary hard disks. We demonstrate that the predicted plasticization effect is in qualitative agreement with experimental results. Furthermore, also some general properties of the glass transition lines are discussed.

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