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Research Article | Open Access

Synchronous measurement of tribocharge and force at the footpads of freely moving animals

Yi SONG1,2, Zhouyi WANG1,3, Jun ZHOU3, Yang LI3, Zhendong DAI1,3( )
 Institute of Bio-inspired Structure and Surface Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
 College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
 College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Abstract

Hypothesis on electrostatic attraction mechanisms involving the hairy adhesion of climbing animals has been a matter of controversy for several years. The detection of tribocharge and forces at attachment organs of animals is a practical method of clarifying the dispute with respect to electrostatic attraction in the attachment of animals. Nonetheless, the tribo-electrification is rarely examined in the contact-adhesion of animals (especially in their free and autonomous attachment) due to the lack of available devices. Therefore, the present study involves establishing a method and an apparatus that enables synchronous detection of tribocharge and contact forces to study tribo-electrification in the free locomotion of geckos. A type of a combined sensor unit that consists of a three-dimensional force transducer and a capacitor-based charge probe is used to measure contact forces and tribocharge with a magnitude corresponding to several nano-Coulombs at a footpad of geckos when they climb vertically upward on an acrylic oligomer substrate. The experimental results indicate that tribocharge at the footpads of geckos is related to contact forces and contact areas. The measured charge allows the expectation of an exact attraction with magnitude corresponding to dozens of newtons per square meter and provides a probability of examining tribo-electrification in animal attachment from a macro level.

Keywords

tribochargeforcessynchronous measurementanimalfree locomotion

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Friction
Volume 6 Issue 1,
March 2018
Pages 75-83
DOI: 10.1007/s40544-017-0165-7
Cite this article:
SONG Y, WANG Z, ZHOU J, et al. Synchronous measurement of tribocharge and force at the footpads of freely moving animals. Friction, 2018, 6(1): 75-83. https://doi.org/10.1007/s40544-017-0165-7

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Received: 08 January 2017
Revised: 13 April 2017
Accepted: 02 May 2017
Published: 17 October 2017
© The author(s) 2017

This article is published with open access at Springerlink.com

Open Access: The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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