Scientists have recently made a groundbreaking discovery in the field of material engineering by inventing a real-life Spider-Man sticky-web gadget. The gadget is capable of shooting out a fluid that transforms into a strong, sticky fibre, lifting objects several times its weight. This innovation was inspired by the iconic superhero Spider-Man from comic books.
Researchers have long been striving to develop robust fibres that could be used as tethers, drawing inspiration from the silk produced by moths, spiders, and various other insects. However, creating fibres with the necessary stiffness, elasticity, and adhesive properties akin to spider silk has proved to be a significant challenge. This obstacle has now been overcome by scientists at Tufts University, who have made a remarkable breakthrough.
By fortifying a silk moth protein called fibroin with specific additives, it can be transformed into a tough, sticky fibre when shot through a narrow needle. This accidental discovery, detailed in Advanced Functional Materials, marks a crucial advancement in material science. The lead researcher, Marco Lo Presti, shared, “I was working on a project making extremely strong adhesives using silk fibroin and while I was cleaning my glassware with acetone, I noticed a web-like material forming on the bottom of the glass.”
Initially aiming to replicate spider threads, researchers observed that fibroin solutions underwent a semi-solid transformation when exposed to substances like ethanol or acetone over a period of hours. However, when treated with dopamine, the solidification process occurred almost instantly, producing high-tensile sticky fibres. The addition of chitosan, a protein present in insect exoskeletons, increased the tensile strength of the fibres by up to 200 times, while chemicals like borate buffer enhanced adhesiveness by about 18-fold.
The fibres produced can vary in diameter from that of a human hair to approximately half a millimetre, depending on the needle’s bore size. Remarkably, these fibres have demonstrated the ability to lift objects over 80 times their weight under different conditions. In various experiments, the fibres successfully lifted a steel bolt, a laboratory tube floating on water, a scalpel partially buried in sand, and a wooden block from a distance of about 12 centimetres.
While spider silk remains significantly stronger by approximately 1,000 times, the newly developed fibres show immense potential for diverse applications. Dr. Lo Presti highlighted, “This process can be finely tuned to achieve a controlled fabrication of instantaneously formed adhesive hydrogel fibres,” emphasizing the superhero-inspired nature of this material.
This scientific breakthrough not only holds promise for various industries but also exemplifies the power of drawing inspiration from nature to drive innovation in material science. Scientists continue to explore ways to enhance the capabilities of these fibres for practical applications in the future.