Two-dimensional (2D) platelets with highly symmetric structure and low dispersity in size have attracted great attention due to their unique planar structure with high specific surface area. The living crystallization-driven self-assembly of block copolymers (BCPs) in selective solvent through seeded growth approach enables the formation of well-defined 2D platelets with excellent uniformity, which is generally considered via the epitaxial crystallization mechanism. Herein, we demonstrate the lateral growth of hexagonal platelets using BCPs containing crystalline side chains via an alternative growth mechanism known as crystallization by particle attachment. By adding hot polymer solution to the preformed 2D platelet seeds, spherical micelles are immediately formed due to the phase transition of crystalline side chain BCP. These kinetically trapped spheres served as building motifs and were fused into the platelet edges during the aging process. The lateral growth of hexagonal platelets via crystallization by particle attachment was confirmed by morphological imaging and shows living character. Hence, the area of a hexagonal platelet could be finely manipulated by adding different masses of polymer solution to the 2D platelet seeds. Moreover, we reveal that the core length and crystallographic d spacing of the side chain length are both strictly required for the successful lateral growth of platelets via crystallization by particle attachment.

中文翻译：

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通过颗粒附着结晶实现六方血小板胶束的横向生长


具有高度对称结构和低分散性的二维 （2D） 片片由于其独特的平面结构和高比表面积而受到广泛关注。通过晶种生长方法，嵌段共聚物 （BCP） 在选择性溶剂中活体结晶驱动的自组装能够形成具有出色均匀性的定义明确的 2D 片状，这通常通过外延结晶机制来考虑。在此，我们展示了使用含有结晶侧链的 BCP 通过称为颗粒附着结晶的替代生长机制实现六方血小板的横向生长。通过将热聚合物溶液添加到预制的 2D 血小板种子中，由于结晶侧链 BCP 的相变，立即形成球形胶束。这些动力学捕获的球体用作构建基序，并在老化过程中融合到血小板边缘。形态学成像证实了六方血小板通过颗粒附着结晶的横向生长，并显示出活生生的特征。因此，可以通过向 2D 血小板种子中添加不同质量的聚合物溶液来精细操纵六边形血小板的面积。此外，我们揭示了侧链长度的内核长度和晶体学 d 间距都是通过颗粒附着结晶成功横向生长血小板的严格要求。