arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2312.06271cond-mat.soft
收藏

球形限域下溶液态二嵌段共聚物自组装形成的具有多面体排布补丁的纳米球

Nanospheres with Patches Arranged in Polyhedrons from Self-Assembly of Solution-State Diblock Copolymers under Spherical Confinement

Jiaping Wu, Xin Wang, Zheng Wang, Yuhua Yin, Run Jiang, Yao Li, Baohui Li

AI总结:

本研究通过模拟退火技术探究球形纳米孔限域下两亲性二嵌段共聚物的自组装,获得多种补丁纳米球结构并构建相图,揭示了补丁排布的多面体规律及相互作用对结构的调控机制。

摘要:

本研究采用模拟退火技术,研究了可形成球体的溶液态两亲性二嵌段共聚物在球形纳米孔限域下的自组装行为。针对两类孔表面/共聚物相互作用不同的情况,获得了一系列自组装补丁纳米球,并构建了相图。研究观察到具有1-21个疏溶剂结构域的自组装补丁纳米球。当疏溶剂结构域(补丁)数量大于3时,最外层的疏溶剂结构域会堆积成多种多面体,其中识别出3种柏拉图立体:正四面体、正八面体、正二十面体,以及7种约翰逊立体:J12、J13、J17、J50、J51、J86、J87。此外,在包含两类B结构域的结构中,还识别出另一种约翰逊立体J84。这些多面体的全部或大部分面为三角形,因此形状更接近球形,这可能有助于缓解链拉伸。在两类情况的相图中,具有1、4、6、9、12个补丁的纳米球出现在相对较宽的窗口内。在其中一类情况中,补丁数为1-14的所有纳米球均在相图中出现;而在另一类情况中,补丁数为2、3、5、11、13的纳米球未出现在相图中。此外,在给定孔径下,对于两类情况,补丁数量随孔表面/共聚物相互作用强度的增加分别呈非单调变化或保持不变。本研究开展了定量计算,以阐明不同补丁数纳米球的相图窗口大小及结构细节的形成机制。

英文摘要:

Self-assembly of sphere-forming solution-state amphiphilic diblock copolymers under spherical nanopore confinement is investigated using a simulated annealing technique. For two types of cases of different pore-surface/copolymer interactions, sequences of self-assembled patchy nanospheres are obtained, and phase diagrams are constructed. Self-assembled patchy nanospheres with 1-21 solvophobic domains are observed. The outermost solvophobic domains (patches) are packed into various polyhedrons when their number is larger than 3, where three Platonic solids of a regular tetrahedron, an octahedron, and an icosahedron and seven Johnson solids of J12, J13, J17, J50, J51, J86, and J87 are identified. In addition, another Johnson solid of J84 is identified in a structure with two categories of B-domains. These polyhedrons have all or most of their faces in a triangular shape, and hence, they are closer to spherical in shape, which may relieve the chain stretching. Nanospheres with 1, 4, 6, 9, and 12 numbers of patches occur in relatively large windows in the phase diagrams of both types of cases. In one of the two types of cases, all nanospheres with any number of 1-14 patches occur in the phase diagram, whereas in the other type of cases, nanospheres with 2, 3, 5, 11, and 13 numbers of patches are absent in the phase diagram. Furthermore, at a given pore size, the number of patches changes nonmonotonically or is unchanged with an increase in the strength of the pore-surface/copolymer interactions for one type or the other type of case, respectively. Quantitative calculations are performed to elucidate mechanisms of the window size in the phase diagrams of nanospheres with different numbers of patches and structure details.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑