Bio-inspired, topologically connected colloidal arrays via wrinkle and plasma processing

• Topologically 1D arrays of colloidal particles were arranged in wrinkle grooves.
• We were able to transfer a large number of free-standing topologically arrays.
• We demonstrated the feasibility of the preparation of anisotropic particles arrays.

We investigated the fabrication of various topologically patterned 1D arrays of polystyrene colloidal particles, including single, helical, zigzag, triple-line, and random arrays integrated in sinusoidal wrinkle grooves, through simple spin-coating. In an additional processing step, we used the wrinkled substrates as stamps to transfer the formed polystyrene patterns onto planar supports. Subsequent plasma etching of the particle strings yielded anisotropic, topologically connected particles. Interestingly, these colloidal chains can be easily released and dispersed to maintain the topological alignment and long length (>100 μm) with free-standing capability. Depending on the topological structures, these connected particle arrays would enable us to create new bio-inspired materials and devices such as artificial muscles and soft robotics with flexible motion.

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