Autoperforation of two-dimensional materials to generate colloidal state machines capable of locomotion
Name
d0fd00030b.pdf
Description
Published version
Size
1.11 MB
Format
Adobe PDF
Checksum (MD5)
460a8fa125a8d827421a34dd8a452a0c
Author(s)
Liu, Albert Tianxiang
Yang, Jing
LeMar, Lexy N.
Zhang, Ge
Pervan, Ana
Murphey, Todd D.
Strano, Michael S.
Date Issued
June 2020
Journal
Faraday Discussions
Publisher
Royal Society of Chemistry (RSC)
Citation
Liu, Albert Tianxiang et al. "Autoperforation of two-dimensional materials to generate colloidal state machines capable of locomotion." Faraday Discussions 227 (2021): 213-232.
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Terms of Use
Creative Commons Attribution Noncommercial 3.0 unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1039/d0fd00030b
