Tribological properties of sandfish skink's scale under micro loads - Observation of micro structure and tribological properties under μnload

Hiroshi Kinoshita, Ryosuke Masayasu, Masahiro Fujii

Research output: Contribution to journalArticle

Abstract

Sandfish (Scincus scincus), which is kind of reptile living in desert, can move in sand like swimming. It is thought that since sandfish has a low friction scales, it is able to do that. However, the mechanism of the low friction property of the scales is not yet known. In this study, a micro structure of sandfish's scales was investigated, and their tribological properties under (IN loads were measured. Cuticle-like structure, which is observed on human hairs, appeared on the scales. Detected elements on the scales were O, C, N, and S. Ca and Si, which are elements of hard shells and bones, were not detected. A contact angle of sandfish's scale was around 90°, and polytetrafluoroethylene (PTFE) and polyimide (PI) had contact angles of approximately 110° and 60°, respectively. However, an adhesion force of sandfish's scales was lower than those of PTFE and PI. With the exception of a few frictional conditions, a friction force of sandfish's scales was lower than those of PTFE and PI, which would result from the low adhesion force of sandfish's scales.

Original languageEnglish
Pages (from-to)832-840
Number of pages9
JournalToraibarojisuto/Journal of Japanese Society of Tribologists
Volume58
Issue number11
Publication statusPublished - 2013

Fingerprint

Polytetrafluoroethylene
Polytetrafluoroethylenes
Polyimides
Friction
microstructure
Microstructure
Contact angle
Adhesion
polytetrafluoroethylene
polyimides
Bone
friction
Sand
adhesion
reptiles
deserts
hair
bones
sands

Keywords

  • Adhesion force
  • Biomimetics
  • Friction coefficient
  • Microlribology
  • Scanning electron microscopy
  • Wettability

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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abstract = "Sandfish (Scincus scincus), which is kind of reptile living in desert, can move in sand like swimming. It is thought that since sandfish has a low friction scales, it is able to do that. However, the mechanism of the low friction property of the scales is not yet known. In this study, a micro structure of sandfish's scales was investigated, and their tribological properties under (IN loads were measured. Cuticle-like structure, which is observed on human hairs, appeared on the scales. Detected elements on the scales were O, C, N, and S. Ca and Si, which are elements of hard shells and bones, were not detected. A contact angle of sandfish's scale was around 90°, and polytetrafluoroethylene (PTFE) and polyimide (PI) had contact angles of approximately 110° and 60°, respectively. However, an adhesion force of sandfish's scales was lower than those of PTFE and PI. With the exception of a few frictional conditions, a friction force of sandfish's scales was lower than those of PTFE and PI, which would result from the low adhesion force of sandfish's scales.",
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AU - Kinoshita, Hiroshi

AU - Masayasu, Ryosuke

AU - Fujii, Masahiro

PY - 2013

Y1 - 2013

N2 - Sandfish (Scincus scincus), which is kind of reptile living in desert, can move in sand like swimming. It is thought that since sandfish has a low friction scales, it is able to do that. However, the mechanism of the low friction property of the scales is not yet known. In this study, a micro structure of sandfish's scales was investigated, and their tribological properties under (IN loads were measured. Cuticle-like structure, which is observed on human hairs, appeared on the scales. Detected elements on the scales were O, C, N, and S. Ca and Si, which are elements of hard shells and bones, were not detected. A contact angle of sandfish's scale was around 90°, and polytetrafluoroethylene (PTFE) and polyimide (PI) had contact angles of approximately 110° and 60°, respectively. However, an adhesion force of sandfish's scales was lower than those of PTFE and PI. With the exception of a few frictional conditions, a friction force of sandfish's scales was lower than those of PTFE and PI, which would result from the low adhesion force of sandfish's scales.

AB - Sandfish (Scincus scincus), which is kind of reptile living in desert, can move in sand like swimming. It is thought that since sandfish has a low friction scales, it is able to do that. However, the mechanism of the low friction property of the scales is not yet known. In this study, a micro structure of sandfish's scales was investigated, and their tribological properties under (IN loads were measured. Cuticle-like structure, which is observed on human hairs, appeared on the scales. Detected elements on the scales were O, C, N, and S. Ca and Si, which are elements of hard shells and bones, were not detected. A contact angle of sandfish's scale was around 90°, and polytetrafluoroethylene (PTFE) and polyimide (PI) had contact angles of approximately 110° and 60°, respectively. However, an adhesion force of sandfish's scales was lower than those of PTFE and PI. With the exception of a few frictional conditions, a friction force of sandfish's scales was lower than those of PTFE and PI, which would result from the low adhesion force of sandfish's scales.

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