Optimal Feedback Controlled Assembly of Perfect Crystals.
Optimal Feedback Controlled Assembly of Perfect Crystals.
复制标题
最佳反馈控制完美晶体的组装。
DOI：
10.1021/acsnano.6b02400
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发表时间：
2016
期刊：
影响因子：
17.1
通讯作者：
M. Bevan
中科院分区：
文献类型：
--
作者：
Xun Tang;B. Rupp;Yuguang Yang;Tara D. Edwards;M. Grover;M. Bevan
完美有序状态是各种分子到微尺度系统中的目标，例如，原子团簇、蛋白质折叠、蛋白质结晶、纳米粒子超晶格和胶体晶体。然而，没有明显的方法来控制完美有序的全球自由能最小结构的组装；近平衡组装是不切实际的缓慢，更快的不平衡过程通常以缺陷态终止。在这里，我们展示了通过使用电场介导的胶体颗粒结晶的闭环控制来导航动力学瓶颈来快速而稳健地组装完美晶体。使用基于反应坐标的动态模型，用动态规划计算最优策略。通过实时跟踪随机粒子构型并通过反馈调整外加电场，引导未组装粒子通过多晶态演化为单域晶体。这种控制目标结构组装的方法基于一般原理，使其适用于从纳米到微米的广泛过程(其中，调整全局热力学变量产生通过不同状态的相对自由能对不同状态的热采样进行时间控制)。
Perfectly ordered states are targets in diverse molecular to microscale systems involving, for example, atomic clusters, protein folding, protein crystallization, nanoparticle superlattices, and colloidal crystals. However, there is no obvious approach to control the assembly of perfectly ordered global free energy minimum structures; near-equilibrium assembly is impractically slow, and faster out-of-equilibrium processes generally terminate in defective states. Here, we demonstrate the rapid and robust assembly of perfect crystals by navigating kinetic bottlenecks using closed-loop control of electric field mediated crystallization of colloidal particles. An optimal policy is computed with dynamic programming using a reaction coordinate based dynamic model. By tracking real-time stochastic particle configurations and adjusting applied fields via feedback, the evolution of unassembled particles is guided through polycrystalline states into single domain crystals. This approach to controlling the assembly of a target structure is based on general principles that make it applicable to a broad range of processes from nano- to microscales (where tuning a global thermodynamic variable yields temporal control over thermal sampling of different states via their relative free energies).
影响因子：
8.6
作者：
T. Skinner;D. Aarts;R. Dullens
通讯作者：
T. Skinner;D. Aarts;R. Dullens
影响因子：
4.4
作者：
Prinz, Jan-Hendrik;Wu, Hao;Noe, Frank
通讯作者：
Noe, Frank