Targeted assembly and synchronization of self-spinning microgears
Targeted assembly and synchronization of self-spinning microgears
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DOI：
10.1038/s41567-018-0227-4
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发表时间：
2018-11-01
期刊：
影响因子：
19.6
通讯作者：
Palacci, Jeremie
中科院分区：
文献类型：
--
作者：
Aubret, Antoine;Youssef, Mena;Palacci, Jeremie
自组装是将组件自主组织成模式或结构：生物学的基本成分和复杂组织的理想途径。在平衡状态下，结构通过特定的相互作用（2-8）编码，对系统来说是不利的熵代价。另一种被自然界广泛使用的方法是使用能量输入来绕过熵瓶颈，并发展出在平衡状态下不可能实现的特征（9）。通过胶体科学的最新进展（10，11）可以获得局部注入能量的耗散构建块，但尚未用于控制自组装。在这里，我们展示了有针对性地形成自供电的微齿轮从活性粒子和他们的自主同步到动态超结构。我们使用一种消耗燃料的光敏组件，赤铁矿，来设计趋光性微游泳者，它们可以形成自旋转的微齿轮，遵循时空光模式。齿轮通过扩散电泳（diffusiophoresis）通过其化学云耦合，并构成同步超结构的基本砖块，这些砖块自主调节其动力学。结果定量合理化的基础上的一个随机描述的diffusio-phoretic振荡器动态耦合化学梯度。我们的研究结果利用非平衡电泳现象程序的相互作用和直接自组装的保真度和特异性。它为自主构建动态架构和功能微机械奠定了基础。
Self-assembly is the autonomous organization of components into patterns or structures: an essential ingredient of biology and a desired route to complex organization(1). At equilibrium, the structure is encoded through specific interactions(2-8), at an unfavourable entropic cost for the system. An alternative approach, widely used by nature, uses energy input to bypass the entropy bottleneck and develop features otherwise impossible at equilibrium(9). Dissipative building blocks that inject energy locally were made available by recent advances in colloidal science(10,11) but have not been used to control self-assembly. Here we show the targeted formation of self-powered microgears from active particles and their autonomous synchronization into dynamical superstructures. We use a photoactive component that consumes fuel, haematite, to devise phototactic microswimmers that form self-spinning microgears following spatiotemporal light patterns. The gears are coupled via their chemical clouds by diffusiophoresis(12) and constitute the elementary bricks of synchronized superstructures, which autonomously regulate their dynamics. The results are quantitatively rationalized on the basis of a stochastic description of diffusio-phoretic oscillators dynamically coupled by chemical gradients. Our findings harness non-equilibrium phoretic phenomena to program interactions and direct self-assembly with fidelity and specificity. It lays the groundwork for the autonomous construction of dynamical architectures and functional micro-machinery.