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Related Concept Videos

Adhesion01:14

Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Surface roughness rather than surface chemistry essentially affects insect adhesion.

Matt W England1, Tomoya Sato1, Makoto Yagihashi2

  • 1National Institute of Advanced Industrial Science and Technology (AIST), 2266-98, Anagahora, Shimoshidami, Moriyama, Nagoya 463-8560, Japan.

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|November 10, 2016
PubMed
Summary

Surface roughness, not chemical properties, significantly impacts ladybird beetle (Coccinella septempunctata) attachment. This finding is crucial for understanding insect adhesion and biomimetic design.

Keywords:
insect attachmentsuperhydrophilicitysuperhydrophobicitysuperoleophobicitysurface structures

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Area of Science:

  • Entomology
  • Biomechanics
  • Materials Science

Background:

  • Ladybird beetles (Coccinella septempunctata) exhibit remarkable attachment capabilities.
  • Understanding insect adhesion is key for biomimetic applications and pest control.

Purpose of the Study:

  • To investigate the influence of surface properties on the attachment ability of Coccinella septempunctata.
  • To determine whether chemical or topographical factors are dominant in beetle adhesion.

Main Methods:

  • Systematic investigation of beetle attachment on eight distinct surfaces.
  • Traction force tests were employed to quantify attachment.
  • Surfaces varied in chemical composition and topographical features.

Main Results:

  • Chemical surface properties (wettability to water/oil) showed no significant effect on beetle attachment.
  • Surface roughness emerged as the dominant factor influencing beetle adhesion.
  • A strong correlation was observed between surface topography and attachment strength.

Conclusions:

  • Surface roughness is the primary determinant of Coccinella septempunctata attachment.
  • Chemical cues play a minimal role in the adhesive mechanisms of these beetles.
  • Findings inform biomimetic designs for adhesion and ecological studies of insect-surface interactions.