Design and Characterization of Rotational Multicomponent Catalytic Nanomotors

Multicomponent rotational nanomotors consisting of Pt‐coated TiO2 nanoarms grown upon ≈2.01‐µm‐diameter silica microbeads designed by dynamic shadowing growth are presented. When exposed to H2O2, the structures rotate about an axis through the center of the microbead and perpendicular to the TiO2 na...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2009-10, Vol.5 (20), p.2304-2308
Main Authors: Gibbs, J. G., Zhao, Y.-P.
Format: Article
Language:English
Subjects:
Catalysis
dynamic shadowing growth
Dynamics
Mathematical models
microbeads
Microorganisms
Nanocomposites
Nanomaterials
nanomotors
nanorods
Nanostructure
Nanotechnology - methods
Nanotubes - chemistry
Rotational
Titanium dioxide
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Summary:Multicomponent rotational nanomotors consisting of Pt‐coated TiO2 nanoarms grown upon ≈2.01‐µm‐diameter silica microbeads designed by dynamic shadowing growth are presented. When exposed to H2O2, the structures rotate about an axis through the center of the microbead and perpendicular to the TiO2 nanoarm at a rate of 0.15 Hz per % H2O2 concentration. The rotational frequency increases parabolically when the surface tension of the solution is altered by the addition of sodium dodecyl sulphate; both relationships are explainable by a nanobubble‐ejection model. The analysis of rotational multicomponent catalytic nanomotors consisting of 2.01‐µm‐diameter silica microbeads with Pt‐coated TiO2 arms fabricated by dynamic shadowing growth is presented. The nanomotors rotate about the center of the microbead at a constant rate in hydrogen peroxide, explainable by the balance of the drive and drag force as shown in the figure.
ISSN:1613-6810
1613-6829
1613-6829
DOI:10.1002/smll.200900686