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Nature | 南京大学&复旦大学等 | 用“一半引导”拼出复杂晶格,新方法破解自组装难题

  • 2026-04-10 05:22:25
Nature | 南京大学&复旦大学等 | 用“一半引导”拼出复杂晶格,新方法破解自组装难题

用“一半引导”拼出复杂晶格,新方法破解自组装难题

你有没有试过用乐高积木搭一座对称又复杂的城堡?如果每块积木都得精准定位,稍有偏差就卡住,那过程一定又慢又容易出错。材料科学家也面临类似困境:如何让微小粒子自发排列成兼具多种旋转对称性的复杂晶格?这类结构是笼目超导体、负泊松比材料和拓扑光子晶体等功能材料的核心,但传统方法要么依赖特殊形状的粒子,要么需要完全固定的模板,极易陷入“动力学阻挫”——粒子被卡死,缺陷难以修复。

现在,复旦大学谭鹏教授、南京大学马余强院士与东京大学Hajime Tanaka教授团队合作,在《Nature》发表了一项突破性研究,提出一种名为“双对称性引导(DSG)”的新策略,仅需稀疏固定一半粒子,另一半就能在纯排斥力作用下自动“找位”,高效组装出包括阿基米德晶格和二维准晶在内的复杂结构。

一半固定,一半自组织:巧妙利用几何“对偶性”

想象一幅中国传统窗棂图案——看似繁复,实则由两种互补的几何单元交织而成。研究团队正是从这种“自对偶”几何特性中获得灵感。他们发现,许多复杂晶格(如(3.4.6.4)型阿基米德铺砌)可以被分解为两个互为“对偶”的子晶格:一个由顶点构成,另一个由这些顶点形成的多边形中心构成。

在实验中,研究人员将带负电的胶体粒子铺在油水界面上,粒子间存在各向同性的偶极排斥力。他们使用快速扫描的光镊(基于声光偏转器AOD),只在其中一个子晶格的少数关键位置施加光学陷阱,将部分粒子“钉住”。神奇的是,其余未被固定的粒子竟自动迁移到对偶子晶格的正确位置,最终完整复现目标晶格。

突破传统瓶颈:缺陷少、效率高、适用广

传统全模板法要求所有粒子都被强力约束,导致粒子无法移动调整,一旦出错就“定型”为缺陷。而DSG的精妙之处在于:固定一半,解放另一半。被固定的子晶格提供了对称性“骨架”,而自由粒子仍保有连通的空隙通道,可自由移动、纠错、弛豫。

模拟与实验均证实,这种方法不仅能组装出(3².4.3.4)、(4.8²)等多种阿基米德晶格,还能构建8重、10重甚至12重对称的二维准晶——这些结构因缺乏平移周期性,传统自组装极难实现。更重要的是,无需各向异性粒子或定向化学键,仅靠简单的球形胶体和排斥力即可完成。

研究还揭示了一个深刻洞见:完全固定其实是DSG的一个极端特例。若将传统模板法纳入DSG框架重新设计,系统性地减少固定点数量,就能显著降低动力学势垒,抑制缺陷形成。

从基础科学到未来材料:一条通用路径

这项工作不仅解决了复杂晶格自组装的长期难题,更提供了一种普适性设计范式。由于不依赖特殊粒子形状或复杂相互作用,DSG原理可拓展至原子外延、嵌段共聚物、纳米光子学等多个领域。未来,科学家或许能像编程一样,“编写”晶格对称性,定制具有特定光学、力学或电子性质的新材料。

例如,在光子晶体中,通过DSG精确排布介电粒子,可构造拓扑保护的光传输通道;在机械超材料中,可设计出受压反而横向膨胀的“拉胀”结构。结构复杂性与相互作用简单性从此解耦,大大降低了实验门槛。

这项由中国科学家主导、国际合作完成的研究,再次证明:最优雅的解决方案,往往源于对自然几何本质的洞察

那么问题来了:如果只给一半“指令”,你的手机APP还能自动完成剩下的一半任务吗?欢迎在评论区聊聊你对“最小引导、最大自组织”的看法!

📚 参考文献

Huang Fang, Xiaotian Li, Wensi Sun, Chengxin Wang, Nuo Chen, Yining Gan, et al. Dual-symmetry-guided assembly of complex lattices. Nature, 2026: 1-8. DOI: https://doi.org/10.1038/s41586-026-10364-3.

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#胶体自组装 #复杂晶格 #光镊操控 #软物质物理 #材料设计

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  1. CONNECT:[ UseTime:0.000591s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000881s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000322s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000315s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000669s ]
  6. SELECT * FROM `set` [ RunTime:0.000229s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000720s ]
  8. SELECT * FROM `article` WHERE `id` = 522278 LIMIT 1 [ RunTime:0.000850s ]
  9. UPDATE `article` SET `lasttime` = 1776695426 WHERE `id` = 522278 [ RunTime:0.001053s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000289s ]
  11. SELECT * FROM `article` WHERE `id` < 522278 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000612s ]
  12. SELECT * FROM `article` WHERE `id` > 522278 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001085s ]
  13. SELECT * FROM `article` WHERE `id` < 522278 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001168s ]
  14. SELECT * FROM `article` WHERE `id` < 522278 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001223s ]
  15. SELECT * FROM `article` WHERE `id` < 522278 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000914s ]
0.079603s