Emergent symmetries in block copolymer epitaxy

被引：21

作者：

Ding, Yi ^{[1
]}

Gadelrab, Karim R. ^{[1
]}

Rodriguez, Katherine Mizrahi ^{[1
]}

Huang, Hejin ^{[1
]}

Ross, Caroline A. ^{[1
]}

Alexander-Katz, Alfredo ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

关键词：

STRONG-SEGREGATION THEORY; FRANK-KASPER; BICONTINUOUS PHASES; SQUARE ARRAYS; GRAPHOEPITAXY; BLENDS;

D O I：

10.1038/s41467-019-10896-5

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The directed self-assembly (DSA) of block copolymers (BCPs) has shown promise in fabricating customized two-dimensional (2D) geometries at the nano- and meso-scale. Here, we discover spontaneous symmetry breaking and superlattice formation in DSA of BCP. We observe the emergence of low symmetry phases in high symmetry templates for BCPs that would otherwise not exhibit these phases in the bulk or thin films. The emergence phenomena are found to be a general behavior of BCP in various template layouts with square local geometry, such as 4(4) and 3(2)434 Archimedean tilings and octagonal quasicrystals. To elucidate the origin of this phenomenon and confirm the stability of the emergent phases, we implement self-consistent field theory (SCFT) simulations and a strong-stretching theory (SST)-based analytical model. Our work demonstrates an emergent behavior of soft matter and draws an intriguing connection between 2-dimensional soft matter self-assembly at the mesoscale and inorganic epitaxy at the atomic scale.

引用

页数：7

共 30 条

[1] Graphoepitaxy of self-assembled block copolymers on two-dimensional periodic patterned templates [J].