Non-Equilibrium Assembly of Light-Activated Colloidal Mixtures
Non-Equilibrium Assembly of Light-Activated Colloidal Mixtures
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DOI：
10.1002/adma.201701328
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发表时间：
2017-08-25
影响因子：
29.4
通讯作者：
Mark, Andrew G.
中科院分区：
文献类型：
--
作者：
Singh, Dhruv P.;Choudhury, Udit;Mark, Andrew G.
人工活性物质系统表现出的集体现象为制造非平衡微型组件提供了新的途径。在这里，显示了被动二氧化硅胶体结晶成良好控制的二维组件，这是由少量自驱动活性胶体引导的。活性胶体是二氧化钛-二氧化硅 Janus 颗粒，在紫外线照射下会被推进。吸引力相互作用的强度以及组装簇的范围可以通过光强度来调节。极少量的活性胶体就足以诱导动态晶体的组装。该方法产生合理设计的胶体簇和晶体，具有可控的尺寸、形状和对称性。这种多组分活性物质系统提供了获得平衡系统中找不到的结构和组件的可能性。
The collective phenomena exhibited by artificial active matter systems present novel routes to fabricating out-of-equilibrium microscale assemblies. Here, the crystallization of passive silica colloids into well-controlled 2D assemblies is shown, which is directed by a small number of self-propelled active colloids. The active colloids are titania-silica Janus particles that are propelled when illuminated by UV light. The strength of the attractive interaction and thus the extent of the assembled clusters can be regulated by the light intensity. A remarkably small number of the active colloids is sufficient to induce the assembly of the dynamic crystals. The approach produces rationally designed colloidal clusters and crystals with controllable sizes, shapes, and symmetries. This multicomponent active matter system offers the possibility of obtaining structures and assemblies that cannot be found in equilibrium systems.