标题： 静电组装的开放正方形和棋盘超晶格 显示英文标题

标题： Electrostatically Assembled Open Square and Checkerboard Superlattices

摘要： 可编程地将纳米粒子组装成非六方晶格的结构仍然是一个挑战。 与紧密堆积的六方结构相比，组装开放式的棋盘状或正方形晶格更为困难。 在此，我们介绍了一种统一且稳健的方法，在液-气界面将纳米粒子组装成一系列二维超晶格。 金纳米粒子接枝了pH响应性、水溶性的聚乙二醇链，末端带有-COOH或-NH2基团，从而可以控制粒子间的相互作用，而接枝聚合物的分子量决定了其构象。 这种综合控制使棋盘状、简单正方和体心蜂窝超晶格得以结晶。 我们发现，即使纳米粒子核心尺寸相同，聚合物的分子量也决定了超晶格的对称性和稳定性。 此外，调节pH值可以引发不同晶格类型之间的结构转变。 这种方法为可编程制造具有定制结构的胶体超结构开辟了新途径。 显示英文摘要

摘要： Programmable assembly of nanoparticles into structures other than hexagonal lattices remains challenging. Assembling an open checkerboard or square lattice is harder to achieve compared to a close-packed hexagonal structure. Here, we introduce a unified, robust approach to assemble nanoparticles into a diverse family of two-dimensional superlattices at the liquid-air interface. Gold nanoparticles are grafted with pH-responsive, water-soluble poly(ethylene glycol) chains terminating in -COOH or -NH2 end groups, enabling control over interparticle interactions, while the grafted polymer's molecular weight dictates its conformation. This combined control crystallizes checkerboard, simple-square, and body-centered honeycomb superlattices. We find that even for identical nanoparticle core sizes, the polymer's molecular weight dictates superlattice symmetry and stability. Furthermore, tuning pH induces structural transitions between different lattice types. This method opens new avenues for the programmable fabrication of colloidal superstructures with tailored architectures.