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Adhesion01:14

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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.
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Evaluating Dryocosmus Kuriphilus-induced Damage on Castanea Sativa
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Robust, universal, and persistent bud secretion adhesion in horse-chestnut trees.

Dagmar Voigt1, Jaekang Kim2, Anne Jantschke3

  • 1Institute for Botany, Faculty of Biology, Technische Universität Dresden, 01062, Dresden, Germany. dagmar.voigt@tu-dresden.de.

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Summary

Horse-chestnut bud secretions form a robust, non-drying adhesive resistant to environmental stress. This natural pressure-sensitive adhesive

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Area of Science:

  • Biomaterials Science
  • Adhesion Science
  • Plant Biology

Background:

  • Horse-chestnut tree buds secrete a viscous fluid for protection.
  • The secretion's resilience to environmental factors and its adhesive properties are not fully understood.

Purpose of the Study:

  • To investigate the physical and chemical properties of horse-chestnut bud secretion.
  • To determine the secretion's adhesive capabilities and stability under various conditions.
  • To explore its potential as a biomimetic adhesive.

Main Methods:

  • Microscopic analysis of the secretion under heat, frost, UV radiation, and arid/wet conditions.
  • Measurement of pull-off forces on hydrophilic and lipophilic surfaces.
  • Spectroscopic analysis (Raman, infrared, nuclear magnetic resonance) to determine chemical composition.

Main Results:

  • The secretion remains stable, non-drying, and non-melting under extreme conditions (heat, frost, UV, arid).
  • It exhibits universal wetting and adhesion to diverse surfaces, with high pull-off forces (up to 204 kPa).
  • Spectroscopic analysis revealed a composition of aliphatic hydrocarbons, esters, carboxylic acids, amides, and terpenoids.

Conclusions:

  • Horse-chestnut bud secretion is a robust, multifunctional pressure-sensitive adhesive with potential biomimetic applications.
  • Its unique composition, including nonpolar and polar components, enables universal adhesion and stability.
  • Findings offer insights into ecological-adhesion mechanisms and inspire novel adhesive designs.