Phase Behavior of Dense Colloidal Binary Monolayers
Phase Behavior of Dense Colloidal Binary Monolayers
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DOI：
10.1021/la302718q
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发表时间：
2012-12-04
期刊：
影响因子：
3.9
通讯作者：
Ortega, F.
中科院分区：
文献类型：
--
作者：
Bonales, L. J.;Martinez-Pedrero, F.;Ortega, F.
在这项工作中，我们研究了二维致密二元胶体单层结构如何随着小/大颗粒相对浓度的变化而发展。平移和定向分布函数已用于通过全局和局部顺序的详细表征来监测连续相变。我们观察到不同尺寸颗粒数量的逐渐增加如何导致连续的玻璃化过程以及如何在等摩尔混合物中形成均匀的二元玻璃。此外，我们还进行了一个简单的计算，将发现的结构与偶极势对联系起来，从而可以预测其他任意二元混合物中的局部结构。最后，我们通过将已建立的场景与部分聚集的单层中发现的结构特征进行比较，证实了二元系统作为玻璃形成模型的优点。
In this work, we study how structures develop on 2D dense binary colloidal monolayers as a function of the relative concentration of small/large particles. Translational and orientational distribution functions have been used to monitor the continuous phase transition through a detailed characterization of the global and local order. We have observed how a gradual enhancement in the number of particles of different sizes leads to a continuous vitrification process and how homogeneous binary glasses form in equimolar mixtures. Also, we have performed a simple calculation that relates the structures found to the pair dipolar potential, allowing the forecast of local structures in other arbitrary binary mixtures. Finally, we have corroborated the goodness of the binary systems as a glass-forming model by comparing the established scenario with the structural features found in partially aggregated monolayers.