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arXiv 1102.1630cond-mat.soft
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周期衬底上的胶体离子复合物:基态构型和模式转换

Colloidal ionic complexes on periodic substrates: ground state configurations and pattern switching

Samir El Shawish, Jure Dobnikar, Emmanuel Trizac

摘要:

我们从理论和数值上研究了周期性衬底势作用下的“胶体离子团簇”的有序性。每个团簇由三个带电的球形胶体组成:两个带负电,一个带正电。衬底是一个正方形或矩形阵列的陷阱,每个限制一个这样的集群。通过改变晶格常数从大到小,观察到的团簇首先是棒状的,并形成铁和反铁相,然后它们弯曲成香蕉状的形状,最后凝聚成球状结构。值得注意的是,在单簇结构和双簇结构之间的宽参数范围内,我们发现了由六个胶体组成的稳定的超复合物,形成葡萄状或火箭状结构。我们研究了通过施加外电场实现宏观模式切换的可能性。

英文摘要:

We theoretically and numerically studied ordering of "colloidal ionic clusters" on periodic substrate potentials as those generated by optical trapping. Each cluster consists of three charged spherical colloids: two negatively and one positively charged. The substrate is a square or rectangular array of traps, each confining one such cluster. By varying the lattice constant from large to small, the observed clusters are first rod-like and form ferro- and antiferro-like phases, then they bend into a banana-like shape and finally condense into a percolated structure. Remarkably, in a broad parameter range between single-cluster and percolated structures, we have found stable supercomplexes composed of six colloids forming grape-like or rocket-like structures. We investigated the possibility of macroscopic pattern switching by applying external electrical fields.

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