Sequence-encoded colloidal origami and microbot assemblies from patchy magnetic cubes.
Sequence-encoded colloidal origami and microbot assemblies from patchy magnetic cubes.
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DOI：
10.1126/sciadv.1701108
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发表时间：
2017-08
期刊：
影响因子：
13.6
通讯作者：
Velev OD
中科院分区：
文献类型：
--
作者：
Han K;Shields CW 4th;Diwakar NM;Bharti B;López GP;Velev OD
贴片磁性微立方体的序列编码组装使自我重新配置胶体折纸和“微型机器人”成为可能。胶体规模的组件可以根据需要重新配置，可以作为下一代软“微型机器人”、人造肌肉和其他仿生设备。这需要将粒子精确地排列成预先编程的结构，当受到外部场的驱动时，这些结构可以可逆地改变形状。具有编码定向粒子-粒子相互作用的胶体级组件的设计和制造仍然是一个主要的挑战。我们展示了如何设计金属介电斑块微立方体的组件，通过磁极化储存能量，并通过微尺度重构按需释放能量。链状装配体折叠和重构的动态模式可以用立方体方向序列编码。微立方体金属表面的残余极化导致邻近粒子之间的局部相互作用，这种相互作用是由它们从外部磁场中获取能量后形状的构象限制所指导的。这些结构也可以通过外部磁场的全局力进行定向移动、操纵和操纵。我们通过特定序列组件的例子来说明这些能力，这些组件可以被驱动、重新定向和空间机动，以执行微尺度操作，如捕获和运输活细胞，作为微型机器人、微型搅拌机和其他主动微结构的原型。
Sequence-encoded assembly of patchy magnetic microcubes enables making self-reconfiguring colloidal origami and “microbots.” Colloidal-scale assemblies that reconfigure on demand may serve as the next generation of soft “microbots,” artificial muscles, and other biomimetic devices. This requires the precise arrangement of particles into structures that are preprogrammed to reversibly change shape when actuated by external fields. The design and making of colloidal-scale assemblies with encoded directional particle-particle interactions remain a major challenge. We show how assemblies of metallodielectric patchy microcubes can be engineered to store energy through magnetic polarization and release it on demand by microscale reconfiguration. The dynamic pattern of folding and reconfiguration of the chain-like assemblies can be encoded in the sequence of the cube orientation. The residual polarization of the metallic facets on the microcubes leads to local interactions between the neighboring particles, which is directed by the conformational restrictions of their shape after harvesting energy from external magnetic fields. These structures can also be directionally moved, steered, and maneuvered by global forces from external magnetic fields. We illustrate these capabilities by examples of assemblies of specific sequences that can be actuated, reoriented, and spatially maneuvered to perform microscale operations such as capturing and transporting live cells, acting as prototypes of microbots, micromixers, and other active microstructures.
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影响因子：
13.6
作者：
Kaiser A;Snezhko A;Aranson IS
通讯作者：
Aranson IS
DOI：
10.1073/pnas.1116564108
发表时间：
2011-12-20
影响因子：
11.1
作者：
Shepherd, Robert F.;Ilievski, Filip;Whitesides, George M.
通讯作者：
Whitesides, George M.
影响因子：
41.2
作者：
Cademartiri, Ludovico;Bishop, Kyle J. M.
通讯作者：
Bishop, Kyle J. M.
影响因子：
41.2
作者：
Kim, Jiyun;Chung, Su Eun;Kwon, Sunghoon
通讯作者：
Kwon, Sunghoon
影响因子：
10.8
作者：
Malachowski K;Jamal M;Jin Q;Polat B;Morris CJ;Gracias DH
通讯作者：
Gracias DH