Autoperforation of two-dimensional materials to generate colloidal state machines capable of locomotion
| Autor: | Michael S. Strano, Jing Fan Yang, Todd D. Murphey, Lexy N LeMar, Ge Zhang, Albert Tianxiang Liu, Ana Pervan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Computer science
Microfluidics Mechanical engineering 02 engineering and technology Propulsion ENCODE 01 natural sciences Catalysis 0103 physical sciences Humans Fluidics Physical and Theoretical Chemistry 010306 general physics Finite-state machine business.industry Testbed Robotics Hydrogen Peroxide 021001 nanoscience & nanotechnology Graphite Artificial intelligence 0210 nano-technology business Energy harvesting Locomotion |
| Zdroj: | Faraday Discussions. 227:213-232 |
| ISSN: | 1364-5498 1359-6640 |
| Popis: | A central ambition of the robotics field has been to increasingly miniaturize such systems, with perhaps the ultimate achievement being the synthetic microbe or cell sized machine. To this end, we have introduced and demonstrated prototypes of what we call colloidal state machines (CSMs) as particulate devices capable of integrating sensing, memory, and energy harvesting as well as other functions onto a single particle. One technique that we have introduced for creating CSMs based on 2D materials such as graphene or monolayer MoS2 is "autoperforation", where the nanometer-scale film is fractured around a designed strain field to produce structured particles upon liftoff. While CSMs have been demonstrated with functions such as memory, sensing, and energy harvesting, the property of locomotion has not yet been demonstrated. In this work, we introduce an inversion moulding technique compatible with autoperforation that allows for the patterning of an external catalytic surface that enables locomotion in an accompanying fuel bath. Optimal processing conditions for electroplating a catalytic Pt layer to one side of an autoperforated CSM are elucidated. The self-driven propulsion of the resulting Janus CSM in H2O2 is studied, including the average velocity, as a function of fluid surface tension and H2O2 concentration in the bath. Since machines have to encode for a specific task, this work summarizes efforts to create a microfluidic testbed that allows for CSM designs to be evaluated for the ultimate purpose of navigation through complex fluidic networks, such as the human circulatory system. We introduce two CSM designs that mimic aspects of human immunity to solve search and recruitment tasks in such environments. These results advance CSM design concepts closer to promising applications in medicine and other areas. |
| Databáze: | OpenAIRE |
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