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arXiv 1907.00745cond-mat.soft
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圆盒中核-电晕粒子的自组装

Self-assembly of core-corona particles confined in a circular box

Erik R. Fonseca, Carlos I. Mendoza

摘要:

利用蒙特卡罗模拟,我们研究了在二维空间中,封闭在一个圆形盒子中的胶体粒子通过各向同性核-冠势相互作用的组装。我们探讨了在低温下的结构多样性作为粒子的数量(N)和大小的限制盒的功能,并发现了丰富的各种模式,没有观察到在无限制的平坦空间。对于少量粒子(N<=6),我们确定了零温度最小能量配置在一个给定的盒子大小,我们构建的相图作为温度和盒子半径的函数为N=4的特定情况。当颗粒的数量是大的(N>=100),我们区分不同的制度,出现在接近紧密包装配置的路线,作为盒尺寸减小。这些制度的特点是增加的分支点的数目和它们的配位数。在相反的情况下,限制硬盘,我们得到了开放的结构,意想不到的高度各向异性的字符,尽管各向同性的相互作用和限制。我们的研究结果表明,受限的核心电晕粒子可以是一个合适的系统,工程粒子具有高度复杂的内部结构,可以作为积木在分级组装。

英文摘要:

Using Monte Carlo simulations, we study the assembly of colloidal particles interacting via isotropic core-corona potentials in two dimensions and confined in a circular box. We explore the structural variety at low temperatures as function of the number of particles (N) and the size of the confining box and find a rich variety of patterns that are not observed in unconfined flat space. For a small number of particles (N<=6), we identify the zero-temperature minimal energy configurations at a given box size and we construct the phase diagram as function of temperature and box radius for the specific case of N=4. When the number of particles is large (N>=100), we distinguish different regimes that appear in route towards close packing configurations as the box size decreases. These regimes are characterized by the increase in the number of branching points and their coordination number. In contrast to the case of confined hard disks, we obtain open structures with unexpected highly anisotropic character in spite of the isotropy of the interactions and of the confinement. Our findings show that confined core-corona particles can be a suitable system to engineer particles with highly complex internal structure that may serve as building blocks in hierarchical assembly.

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