光活化表面图案控制的可重构胶体组装
Reconfigurable assembly of nematic colloids commanded by photoactivated surface patterns
摘要：
在综合化学过程中，固体或液体微观夹杂物的输运被提出了不同的电泳驱动机制。然而，可逆地解决流动路径、速率和局部反应物浓度的能力尚未实现。在这里，我们表明，与光敏自组装单层化学改性的基板允许直接命令的组装和运输的大型合奏的微米尺寸的颗粒和液滴分散在一个薄层的各向异性流体。我们的策略分离的粒子驱动，实现通过AC电泳，和转向，实现的弹性调制的主机的流体。夹杂物响应单独或集体模式以下任意可重构的路径通过UV/蓝色照明压印。仅仅依靠一般的材料特性，所提出的程序是通用的，足以发展的应用程序，涉及无生命的或活的材料。
英文摘要：
Different phoretic driving mechanisms have been proposed for the transport of solid or liquid microscopic inclusions in integrated chemical processes. However, the ability to reversibly address both the flow path, rate, and local reactant concentration has not yet been realized. Here we show that a substrate chemically modified with photosensitive self-assembled monolayers allows to directly command the assembly and transport of large ensembles of micron-size particles and drops dispersed in a thin layer of anisotropic fluid. Our strategy separates particle driving, realized via AC electrophoresis, and steering, achieved by elastic modulation of the host nematic fluid. Inclusions respond individually or in collective modes following arbitrary reconfigurable paths imprinted via UV/blue illumination. Relying solely on generic material properties, the proposed procedure is versatile enough for the development of applications involving either inanimate or living materials.
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