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첨단연성물질 연구단
첨단연성물질 연구단
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Catalytic Locomotion of Core-Shell Nanowire Motors

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Title
Catalytic Locomotion of Core-Shell Nanowire Motors
Author(s)
Bumjin Jang; Wei Wang; Samuel Wiget; Andrew J. Petruska; Xiangzhong Chen; Chengzhi Hu; Ayoung Hong; David Folio; Antoine Ferreira; Salvador Pané; Bradley J. Nelson
Publication Date
2016-11
Journal
ACS NANO, v.10, no.11, pp.9983 - 9991
Publisher
AMER CHEMICAL SOC
Abstract
We report Au/Ru core-shell nanowire motors. These nanowires are fabricated using our previously developed electrodeposition-based technique, and their catalytic locomotion in the presence of H2O2 is investigated. Unlike conventional bimetallic nanowires that are self-electroosmotically propelled, our open-ended Au/Ru core-shell nanowires show both a noticeable decrease in rotational diffusivity and increase in motor speed with increasing nanowire length. Numerical modeling based on self-electroosmosis attributes decreases in rotational diffusivity to the formation of toroidal vortices at the nanowire tail, but fails to explain the speed increase with length. To reconcile this inconsistency, we propose a combined mechanism of self-diffusiophoresis and electroosmosis based on the oxygen gradient produced by catalytic shells. This mechanism successfully explains not only the speed increase of Au/Ru core-shell nanomotors with increasing length, but also the large variation in speed among Au/Ru, Au/Rh, and Rh/Au core-shell nanomotors. The possible contribution of diffusiophoresis to an otherwise well-established electroosmotic mechanism sheds light on future designs of nanomotors, at the same time highlighting the complex nature of nanoscale propulsion. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3229
ISSN
1936-0851
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
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