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Title: Key parameters controlling the performance of catalytic motors

Abstract

The development of autonomous micro/nanomotors driven by self-generated chemical gradients is a topic of high interest given their potential impact in medicine and environmental remediation. Although impressive functionalities of these devices have been demonstrated, a detailed understanding of the propulsion mechanism is still lacking. In this work, we perform a comprehensive numerical analysis of the key parameters governing the actuation of bimetallic catalytic micropumps. We show that the fluid motion is driven by self-generated electro-osmosis where the electric field originates by a proton current rather than by a lateral charge asymmetry inside the double layer. Hence, the surface potential and the electric field are the key parameters for setting the pumping strength and directionality. The proton flux that generates the electric field stems from the proton gradient induced by the electrochemical reactions taken place at the pump. Surprisingly the electric field and consequently the fluid flow are mainly controlled by the ionic strength and not by the conductivity of the solution, as one could have expected. We have also analyzed the influence of the chemical fuel concentration, electrochemical reaction rates, and size of the metallic structures for an optimized pump performance. Our findings cast light on the complex chemomechanical actuationmore » of catalytic motors and provide important clues for the search, design, and optimization of novel catalytic actuators.« less

Authors:
;  [1];  [2]
  1. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona (Spain)
  2. Departament de Física Fonamental, Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona (Spain)
Publication Date:
OSTI Identifier:
22657872
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 144; Journal Issue: 12; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTUATORS; CATALYSTS; ELECTRIC FIELDS; EXPERIMENTAL DATA; NANOSTRUCTURES; NUMERICAL ANALYSIS; PERFORMANCE; PROTONS; REACTION KINETICS; SURFACE POTENTIAL

Citation Formats

Esplandiu, Maria J., Afshar Farniya, Ali, and Reguera, David, E-mail: dreguera@ub.edu. Key parameters controlling the performance of catalytic motors. United States: N. p., 2016. Web. doi:10.1063/1.4944319.
Esplandiu, Maria J., Afshar Farniya, Ali, & Reguera, David, E-mail: dreguera@ub.edu. Key parameters controlling the performance of catalytic motors. United States. doi:10.1063/1.4944319.
Esplandiu, Maria J., Afshar Farniya, Ali, and Reguera, David, E-mail: dreguera@ub.edu. Mon . "Key parameters controlling the performance of catalytic motors". United States. doi:10.1063/1.4944319.
@article{osti_22657872,
title = {Key parameters controlling the performance of catalytic motors},
author = {Esplandiu, Maria J. and Afshar Farniya, Ali and Reguera, David, E-mail: dreguera@ub.edu},
abstractNote = {The development of autonomous micro/nanomotors driven by self-generated chemical gradients is a topic of high interest given their potential impact in medicine and environmental remediation. Although impressive functionalities of these devices have been demonstrated, a detailed understanding of the propulsion mechanism is still lacking. In this work, we perform a comprehensive numerical analysis of the key parameters governing the actuation of bimetallic catalytic micropumps. We show that the fluid motion is driven by self-generated electro-osmosis where the electric field originates by a proton current rather than by a lateral charge asymmetry inside the double layer. Hence, the surface potential and the electric field are the key parameters for setting the pumping strength and directionality. The proton flux that generates the electric field stems from the proton gradient induced by the electrochemical reactions taken place at the pump. Surprisingly the electric field and consequently the fluid flow are mainly controlled by the ionic strength and not by the conductivity of the solution, as one could have expected. We have also analyzed the influence of the chemical fuel concentration, electrochemical reaction rates, and size of the metallic structures for an optimized pump performance. Our findings cast light on the complex chemomechanical actuation of catalytic motors and provide important clues for the search, design, and optimization of novel catalytic actuators.},
doi = {10.1063/1.4944319},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 12,
volume = 144,
place = {United States},
year = {2016},
month = {3}
}