Although it may seem fragile, the silk produced by spiders is one of the most extraordinary and resistant materials found in nature.
If we compare its tensile strength per unit of weight, spider silk is significantly stronger than high-grade steel and comparable to some of the most advanced synthetic fibers, such as Kevlar.
This incredible strength comes from its complex molecular structure, composed mainly of proteins called fibroins. These proteins are organized in a combination of rigid crystalline regions and elastic amorphous regions, giving it a unique combination of strength and flexibility. A spiderweb can stretch up to five times its original length before breaking, absorbing a large amount of kinetic energy, which is ideal for catching prey in flight.
The production of this material is fascinating: spiders store the silk in liquid form inside special glands and extrude it through spinnerets, controlling the process to create different types of silk with specific properties to build webs, wrap prey, or create egg sacs.
Scientists have spent decades studying spider silk in hopes of replicating its properties for human applications, from bulletproof vests and biodegradable medical sutures to ultralight cables and high-performance textiles. However, producing spider silk artificially on a large scale remains a considerable technological challenge.
Source: Nature Communications
