Effect of patchy particle designs on the bulk properties of the self-assembled structures

本文研究了斑片粒子在二维十二角准晶体（DDQC）中的形成和涨落。用布朗动力学模拟研究了二维十二角准晶体（ddqc）的自组装。斑状粒子具有由球谐Y55描述的五重旋转对称模式。从退火工艺得到的DDQC的形成过程中，我们发现了以下机理。动力学的早期阶段以六边形结构为主。然后，通过粒子重排出现十二面基序的成核，最后基序跨越整个体系。从六边形结构到十二边形母题的转变与粒子的集体运动是一致的。DDQC由十二个基序簇组成，这些基序簇可分为几种填充结构。通过对固定温度下DDQC的分析，我们发现波动的特征是十二元基序网络的变化。最后，我们比较了由斑块粒子系统和各向同性粒子系统组装的ddqc。两种体系的ddqc形成和波动机制相似。通过这一结果，我们对准晶的生长机理有了更好的了解。

We investigate the formation and fluctuation of a two-dimensional dodecagonal quasicrystal (DDQC) by patchy particles.The self-assembly of two-dimensional dodecagonal quasicrystals (DDQCs) from patchy particles is investigated by Brownian dynamics simulations. The patchy particle has a five-fold rotational symmetry pattern described by the spherical harmonics Y55. From the formation of the DDQC obtained by an annealing process, we find the following mechanism. The early stage of the dynamics is dominated by hexagonal structures. Then, nucleation of dodecagonal motifs appears by particle rearrangement, and finally the motifs span the whole system. The transition from the hexagonal structure into the dodecagonal motif is coincident with the collective motion of the particles. The DDQC consists of clusters of dodecagonal motifs, which can be classified into several packing structures. By the analyses of the DDQC under fixed temperature, we find that the fluctuations are characterised by changes in the network of the dodecagonal motifs. Finally we compare the DDQCs assembled from the patchy particle system and isotropic particle system. The two systems share a similar mechanism of the formation and fluctuation of DDQCs.By this result, we have better understanding on the mechanism, the growth of quasicrystal.