Key Lab of Microsystems and Microstructures Manufacturing, Harbin Institute of Technology, XiDaZi Street 92, Harbin, 150001, China.
Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Angew Chem Int Ed Engl. 2021 Jul 19;60(30):16674-16679. doi: 10.1002/anie.202105746. Epub 2021 Jun 21.
We report robust control over the dynamic assembly, disassembly, and reconfiguration of light-activated molybdenum disulfide (MoS ) colloidal motor swarms with features not possible in equilibrium systems. A photochemical reaction produces chemical gradients across the MoS colloidal motors to drive them to move. Under illumination of a gradient light, these colloidal motors display a positive phototactic motion. Mesoscale simulations prove that the self-diffusiophoresis induced by the locally consumed oxygen gradient across MoS colloidal motors dominates the phototactic process. By programming the structured illumination, the collective migration and well-defined shapes of colloidal motor swarms can be externally regulated. The successful realization of programmable swarm transformation of colloidal motors like the emergent behaviors of living systems in nature provides a direct proof-of-concept for active soft materials and systems, with adaptive and interactive functions.
我们报告了对光激活二硫化钼 (MoS ) 胶体马达群的动态组装、拆卸和重构的强大控制，这在平衡系统中是不可能实现的。光化学反应在 MoS 胶体马达中产生化学梯度，驱动它们运动。在梯度光的照射下，这些胶体马达表现出正向趋光运动。介观模拟证明，MoS 胶体马达局部消耗氧气梯度引起的自扩散泳主导了趋光过程。通过编程结构照明，可以外部调节胶体马达群的集体迁移和明确定义的形状。胶体马达如自然生命系统中的新兴行为一样，可以实现可编程的群体转换，这为具有自适应和交互功能的主动软材料和系统提供了直接的概念验证。
