Friction

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

  • Yi Song
  • Zhouyi Wang
  • Jun Zhou
  • Yang Li
  • Zhendong Dai
Open Access
Research Article

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

tribocharge forces synchronous measurement animal free locomotion 

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© The author(s) 2017

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.

Authors and Affiliations

  • Yi Song
    • 1
    • 2
  • Zhouyi Wang
    • 1
    • 3
  • Jun Zhou
    • 3
  • Yang Li
    • 3
  • Zhendong Dai
    • 1
    • 3
  1. 1.Institute of Bio-inspired Structure and Surface EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina
  2. 2.College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina
  3. 3.College of AstronauticsNanjing University of Aeronautics and AstronauticsNanjingChina

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