设计波纹表面以引导胶体自组装
Designing corrugated surfaces to guide colloidal self-assembly
AI总结：
本研究通过双光子聚合设计胶体的各向异性波纹表面，调控耗竭诱导的选择性相互作用，实现多种胶体聚集体的可控制备，为功能软材料制备提供通用框架。
AI中文摘要：
胶体颗粒的自组装可制备具有可编程功能的结构化材料，但以可逆且可扩展的方式控制相互作用特异性和聚集体形态仍是重大挑战。本研究探讨3D打印平面多边形胶体的选择性耗竭诱导自组装，其中纳米级表面形貌通过双光子聚合的精确建模进行工程化设计。通过设计各向异性侧面，引导决定聚集体形态的特定相互作用，根据表面构型可生成二聚体、链状、锯齿状及蜂窝结构。通过改变表面形貌的长度尺度、耗竭剂浓度和溶液离子强度，可调控相互作用的特异性，揭示从选择性聚集到非选择性聚集的转变机制。胶体上侧面相互作用表面的相对位置可实现尺寸跨度大的聚集体组装，而调控相互作用强度可选择性稳定不同结构基元。本研究针对六边形胶体，实验证实几何排列与相互作用能量间的这种协同关系，并通过理论和模拟予以验证。本研究建立了通过微结构设计编程胶体相互作用的通用框架，为制备可重构功能软材料提供新途径。
英文摘要：
The self-assembly of colloidal particles enables the creation of structured materials with programmable functionalities; however, controlling interaction specificity and aggregate morphology in a reversible and scalable manner remains a major challenge. Here, we investigate the selective depletion-induced self-assembly of 3D-printed flat polygonal colloids, where nanoscale surface topography is engineered through precise modeling in two-photon polymerization. By designing anisotropic lateral surfaces, we direct specific interactions that govern aggregate morphology, yielding dimers, chains, zigzag, and honeycomb structures depending on the surface configuration. The specificity of interaction is tuned by varying the length scale of the topographic surfaces, the depletant concentration and the ionic strength of the solution, revealing a transition from selective to non-selective aggregation regimes. The relative placement of lateral interacting surfaces on the colloids enables assembly into aggregates spanning a broad range of sizes, while tuning the interaction strength selectively stabilizes distinct structural motifs. We demonstrate this interplay between geometric arrangement and interaction energy experimentally and corroborate through both theory and simulations for specifically hexagonal shaped colloids. This study establishes a versatile framework for programming colloidal interactions via micro-architectural design, offering new routes for fabricating reconfigurable and functional soft materials.
