Structural effects of glue application in spiders-what can we learn from silk anchors?

Jonas O. Wolff*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Silk is a key innovation in spiders that equally fascinates biologists and material scientists. The anchoring of silken threads is a critical, yet poorly understood aspect of web-building—one that could lead to the development of advanced adhesives. To anchor silk, most spiders produce a structurally unique and rather unexplored bio-adhesive: the two-compound piriform gland secretion. The secretion is spun into elaborate patterns, so called attachment discs that anchor silken threads to substrates. The piriform gland secretion is a glue-coated fibre that combines the high toughness of silk with strong adhesion, even to highly repellent surfaces like Teflon. The glue is used highly economically, dries within less than a second after extrusion and can remain stable for years. Its hierarchical organization, discontinuous contact area and the embedding of compliant fibres may explain the high adhesive performance and flaw tolerance of such a composite product coming from a single, rather simple, type of silk glands. These principles contradict, in many regards, the paradigms of adhesives design and application, like aimed homogeneity of the bonding. Understanding the function of silk anchors may therefore trigger the development of novel industrial adhesives with embedded fibres, and methods of gaining higher bonding strength with less material consumption by smart glue application.

Original languageEnglish
Title of host publicationBio-inspired structured adhesives
Subtitle of host publicationbiological prototypes, fabrication, tribological properties, contact mechanics, and novel concepts
EditorsLars Heepe, Longjian Xue, Stanislav N. Gorb
Place of PublicationCham, Switzerland
PublisherSpringer, Springer Nature
Chapter5
Pages63-80
Number of pages18
ISBN (Electronic)9783319591148
ISBN (Print)9783319591131
DOIs
Publication statusPublished - 2017

Publication series

NameBiologically-Inspired Systems
PublisherSpringer
Volume9
ISSN (Print)2211-0593
ISSN (Electronic)2211-0607

Cite this

Wolff, J. O. (2017). Structural effects of glue application in spiders-what can we learn from silk anchors? In L. Heepe, L. Xue, & S. N. Gorb (Eds.), Bio-inspired structured adhesives: biological prototypes, fabrication, tribological properties, contact mechanics, and novel concepts (pp. 63-80). (Biologically-Inspired Systems; Vol. 9). Cham, Switzerland: Springer, Springer Nature. https://doi.org/10.1007/978-3-319-59114-8_5