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The Design and Control of Catalytic Motors: Manipulating Colloids and Fluids with Self-Generated Forces

Published online by Cambridge University Press:  01 February 2011

Timothy R. Kline ,
Jodi Iwata ,
Paul Lammert ,
Darrell Velegol ,
Thomas Mallouk  and
Ayusman Sen
Timothy R. Kline
Affiliation:
trk145@psu.edu, Pennsylvania State University, Chemistry and Center for Nanoscale Science, 104 Chemistry Building, University Park, PA, 16802, United States
Jodi Iwata
Affiliation:
jui106@psu.edu, Pennsylvania State University, University Park, PA, 16802, United States
Paul Lammert
Affiliation:
lammert@psu.edu, Pennsylvania State University, University Park, PA, 16802, United States
Darrell Velegol
Affiliation:
velegol@engr.psu.edu, Pennsylvania State University, Department of Chemical Engineering, 111 Fenske Building, University Park, PA, 16802, United States
Thomas Mallouk
Affiliation:
tom@chem.psu.edu, Pennsylvania State University, University Park, PA, 16802, United States
Ayusman Sen
Affiliation:
asen@chem.psu.edu, Pennsylvania State University, University Park, PA, 16802, United States
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Abstract

Microfabrication was employed to pattern silver (Ag) on a gold (Au) surface. The two metals served as bimetallic heterogeneous catalysts for the heterogeneous decomposition of H2O2. Silver was the cathode, carrying out H2O2 reduction (to water) and gold the anode carrying out H2O2 oxidation (to oxygen). Both protons and electrons are created at the anode (as a part of the reaction) and migrate to the cathode (migration of ions is a current) where they are consumed. Thereby establishing an electric field (migration of ions obeys Ohm's law), which passively pumps fluids through electroosmosis. Electrophoresis also present as either an additive component to the electroosmotic flow or results in pattern formation (occurs at point where electroosmosis is equal and opposite to that of electrophoresis). Herein, the electrokinetic model is further tested and validated as chemical methods to tune the tracer behavior (convection to pattern formation), design of asymmetric patterns through microfabrication and attempts to indirectly measure the electric field were successful.

Keywords

biomimetic (chemical reaction)catalyticfluidics
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 944: Symposium AA – Molecular Motors, Nanomachines, and Engineered Bio-Hybrid Systems , 2006 , 0944-AA05-05
Copyright
Copyright © Materials Research Society 2006

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