Control of the Properties of Micrometer‐Sized Actuators from Liquid Crystalline Elastomers Prepared in a Microfluidic Setup
Control of the Properties of Micrometer‐Sized Actuators from Liquid Crystalline Elastomers Prepared in a Microfluidic Setup
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DOI：
10.1002/adfm.201001178
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发表时间：
2010-12
影响因子：
19
通讯作者：
Christian Ohm;Eva-Kristina Fleischmann;I. Kraus;C. Serra;R. Zentel
中科院分区：
文献类型：
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作者：
Christian Ohm;Eva-Kristina Fleischmann;I. Kraus;C. Serra;R. Zentel
本文介绍了在微流控装置中用液晶弹性体制备单分散粒子的新结果。为此，液晶单体的液滴在微流控装置中制备，并在它们在微管内流动时聚合。这种方法得到的粒子具有内部取向，这使它们具有驱动特性。当它们被加热成液晶材料的各向同性相时，它们的形状发生了可逆的变化，从而使它们在一个方向上的长度几乎改变了100%。研究了合成过程中实验参数的变化对微致动器性能的影响。研究了它们对原始形状、变形强度、尺寸和力学性能的影响。从实验参数的系统变化中，我们对液晶材料流动液滴中发生的复杂过程有了深入的了解。此外，还对这些致动材料进行了核磁共振分析和溶胀实验。
In this article new results on the preparation of monodisperse particles from a liquid crystalline elastomer in a microfluidic setup are presnted. For this, droplets from a liquid crystalline monomer are prepared in a microfluidic device and polymerized while they are flowing inside a microtube. The particles obtained by this method possess an internal orientation, which gives them actuating properties. When they are heated into the isotropic phase of the liquid crystalline material they show a reversible change in shape whereby they change their length in one direction by almost 100%. It is shown how the variation of experimental parameters during their synthesis impacts the properties of these micro‐actuators. Influence over their primal shape, the strength of their shape changing properties, their size, and their mechanical properties is demontrated. From the systematic variation of experimental parameters a deep understanding of the complex processes taking place in a flowing droplet of a liquid crystalline material is obtainted. Additionally NMR analysis and swelling experiments on these actuating materials are provided.