Bioinspired self-assembled colloidal collectives drifting in three dimensions underwater

Author:

Sun Mengmeng12ORCID,Yang Shihao1ORCID,Jiang Jialin1,Jiang Shuai1ORCID,Sitti Metin2ORCID,Zhang Li13456ORCID

Affiliation:

1. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong SAR, China.

2. Physical Intelligence Department, Max Planck Institute for Instelligent Systems, Heisenbergstr. 3, Stuttgart 70569, Germany.

3. Chow Yuk Ho Technology Center for Innovative Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.

4. Multi-Scale Medical Robotics Center, Hong Kong Science Park, Shatin NT, Hong Kong SAR, China.

5. Department of Surgery, The Chinese University of Hong Kong, Hong Kong SAR, China.

6. CUHK T Stone Robotics Institute, The Chinese University of Hong Kong, Hong Kong SAR, China.

Abstract

Active matter systems feature a series of unique behaviors, including the emergence of collective self-assembly structures and collective migration. However, realizing collective entities formed by synthetic active matter in spaces without wall-bounded support makes it challenging to perform three-dimensional (3D) locomotion without dispersion. Inspired by the migration mechanism of plankton, we propose a bimodal actuation strategy in the artificial colloidal systems, i.e., combining magnetic and optical fields. The magnetic field triggers the self-assembly of magnetic colloidal particles to form a colloidal collective, maintaining numerous colloids as a dynamically stable entity. The optical field allows the colloidal collectives to generate convective flow through the photothermal effect, enabling them to use fluidic currents for 3D drifting. The collectives can perform 3D locomotion underwater, transit between the water-air interface, and have a controlled motion on the water surface. Our study provides insights into designing smart devices and materials, offering strategies for developing synthetic active matter capable of controllable collective movement in 3D space.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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