Arthropod cuticle: A natural composite shell system

Julian F V Vincent

Research output: Contribution to journalArticlepeer-review

162 Citations (Scopus)

Abstract

The cuticle of arthropods (jointed-limb animals), and especially of insects is, by biological standards, a relatively simple composite. It is a single external layer of material forming the skeleton and many sense organs. The fibrous phase is crystalline chitin making nanofibrils of about 3 nm diameter, a few hundreds of nanometers long and a modulus probably in excess of 150 GPa. At least two surfaces of the nanofibril can have silk-like protein attached through specific H-bonds; the rest of the protein is globular. The protein matrix stiffens through dehydration controlled by the introduction of hydrophobic phenolics. Crustacea add up to 40% calcium salts. The stiffness of cuticle can range from tens of GPa to 1 kPa. It can be hardened by the addition of Zn or Mn. It can form springs and change its stiffness and plasticity under the control of the animal. © 2002 Elsevier Science Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1311-1315
Number of pages5
JournalComposites Part A Applied Science and Manufacturing
Volume33
Issue number10
DOIs
Publication statusPublished - 2002

Keywords

  • Composite materials
  • Crystalline materials
  • Chitin
  • Proteins
  • Hydrophobicity
  • Hardness
  • Stiffness
  • Biological organs
  • Plasticity
  • Hydrogen bonds
  • Dehydration

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