Format

Send to

Choose Destination
Nano Lett. 2015 Oct 14;15(10):7077-85. doi: 10.1021/acs.nanolett.5b03140. Epub 2015 Sep 21.

Self-Propelled Nanomotors Autonomously Seek and Repair Cracks.

Author information

1
Department of Nanoengineering, University of California San Diego , La Jolla, California 92093, United States.
2
Department of Chemical Engineering, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States.

Abstract

Biological self-healing involves the autonomous localization of healing agents at the site of damage. Herein, we design and characterize a synthetic repair system where self-propelled nanomotors autonomously seek and localize at microscopic cracks and thus mimic salient features of biological wound healing. We demonstrate that these chemically powered catalytic nanomotors, composed of conductive Au/Pt spherical Janus particles, can autonomously detect and repair microscopic mechanical defects to restore the electrical conductivity of broken electronic pathways. This repair mechanism capitalizes on energetic wells and obstacles formed by surface cracks, which dramatically alter the nanomotor dynamics and trigger their localization at the defects. By developing models for self-propelled Janus nanomotors on a cracked surface, we simulate the systems' dynamics over a range of particle speeds and densities to verify the process by which the nanomotors autonomously localize and accumulate at the cracks. We take advantage of this localization to demonstrate that the nanomotors can form conductive "patches" to repair scratched electrodes and restore the conductive pathway. Such a nanomotor-based repair system represents an important step toward the realization of biomimetic nanosystems that can autonomously sense and respond to environmental changes, a development that potentially can be expanded to a wide range of applications, from self-healing electronics to targeted drug delivery.

KEYWORDS:

Nanomotor; autonomous repair; biomimetic; localization; propulsion

Comment in

PMID:
26383602
DOI:
10.1021/acs.nanolett.5b03140
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for American Chemical Society
Loading ...
Support Center