Droplet evaporative crystallization on microscale heterogeneous surface is a vivid topic in chemical engineering, bioengineering, nanomaterials, and so on. Here, 3D printed interfacial matrix platform with regular pillar convexity and tunnel structure is fabricated to reveal the mechanism of the interfacial micro droplet crystallization. Element‐based rotation volume model is established to simulate the concentration and nucleation barrier distribution during the microscale process. Sodium urate monohydrate and NaCl crystallization on the pillar convex structure both confirm that confined capillary flow in the micro droplet and initial nucleation condition dominate the nucleation, growth control and particle distribution. Droplet crystallization stretches over the tunnel structure reveal an interesting phenomenon that two regions possessing distinct‐different nucleation barriers can isolated obtain the crystal particles from nanoscale to even millimeter scale. The fabricated platform and the capillary circulation transfer theory unfold a potential approach to harvest high value‐added crystals with specific morphology and desire sizes distribution.

中文翻译：

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3D打印规则矩阵平台上的界面微滴蒸发结晶

微尺度异质表面上的液滴蒸发结晶是化学工程，生物工程，纳米材料等领域的生动话题。在这里，制造具有规则的柱面凸度和隧道结构的3D打印界面矩阵平台，以揭示界面微滴结晶的机理。建立了基于元素的旋转体积模型，以模拟微观过程中的浓度和成核势垒分布。柱状凸结构上的尿酸钠一水合物和NaCl结晶均证实了微滴中有限的毛细管流动和初始成核条件主导着成核，生长控制和颗粒分布。隧道结构上的液滴结晶拉伸揭示了一个有趣的现象，即具有不同成核屏障的两个区域可以隔离而获得纳米级甚至毫米级的晶体颗粒。制成的平台和毛细管循环传递理论揭示了一种潜在的方法，可以收获具有特定形态和所需尺寸分布的高附加值晶体。