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Breaking of Lateral Symmetry in Two-Dimensional Crystallization-Driven Self-Assembly on a Surface
Journal of the American Chemical Society ( IF 15.0 ) Pub Date : 2024-05-15 , DOI: 10.1021/jacs.4c02390
Geyu Lin 1 , Jiawei Tao 1 , Yan Sun 1 , Yan Cui 1 , Ian Manners 2 , Huibin Qiu 1
Affiliation  

Symmetry breaking is prevalent in nature and provides distinctive access to hierarchical structures for artificial materials. However, it is rarely explored in two-dimensional (2D) entities, especially for lateral asymmetry. Herein, we describe a unique symmetry breaking process in surface-initiated 2D living crystallization-driven self-assembly. The 2D epitaxial growth occurs only at one lateral side of the immobilized cylindrical micelle seeds, accessing unilateral platelets with the yield increasing with the seed length, the growth temperature, and poly(2-vinylpyridine) corona length (maximum = 92%). Generally, the tilted immobilization of seeds blocks one lateral side and triggers the lateral symmetry breaking, where the intensity and spatial arrangement of seed–surface interactions dictate the regulation. Segmented unilateral platelets with segmented corona regions are further fabricated with the addition of different blended unimers. Remarkably, discrete slope-like and dense blade-like platelet arrays grow off the surface when seeds are compactly aligned either with spherical micelles or themselves. This strategy provides nanoscale insights into the symmetry breaking in long-range self-assembly and would be promising for the design of innovative colloids and smart surfaces.

中文翻译:


二维结晶驱动表面自组装中横向对称性的破缺



对称性破缺在自然界中很普遍,并为人造材料的分层结构提供了独特的途径。然而,它很少在二维(2D)实体中进行探索,特别是对于横向不对称。在这里,我们描述了表面引发的二维活性结晶驱动的自组装中独特的对称性破坏过程。二维外延生长仅发生在固定的圆柱形胶束种子的一侧,进入单侧血小板,产量随着种子长度、生长温度和聚(2-乙烯基吡啶)冠长度(最大值= 92%)而增加。一般来说,种子的倾斜固定会阻挡一侧并引发横向对称性破缺,其中种子与表面相互作用的强度和空间排列决定了调节。通过添加不同的混合单聚体,进一步制备了具有分段冠区域的分段单侧片晶。值得注意的是,当种子与球形胶束或其自身紧密排列时,离散的斜坡状和致密的刀片状血小板阵列会从表面生长出来。该策略提供了对长程自组装中对称性破缺的纳米级见解,并且有望用于创新胶体和智能表面的设计。
更新日期:2024-05-15
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