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When you think of silk, the most familiar image is a silkworm spinning its own thread. But the world of natural adhesives is far broader: the cocoon of a caterpillar, the silk used by an inchworm to descend, and even the strands produced by spider silk—all showcase nature’s mastery of adhesion and strength. A recent breakthrough at Tufts University’s Silklab demonstrates how a silk‑based material can mimic the legendary Spider‑Man webbing.
Tufts researchers work with naturally occurring silks, reengineering them into biomaterials for advanced applications. Using Regenerated Silk Fibroin (RSF)—a protein derived by boiling silk‑moth cocoons and dissolving the fibers—scientists have developed edible coatings to extend produce shelf life and underwater glues that outperform conventional adhesives. In an accidental discovery, Assistant Professor Marco Lo Presti observed a web‑like film forming on glass after cleaning with acetone. Further experimentation revealed that an RSF solution could solidify almost instantly and lift small objects, reminiscent of comic‑book webbing. The study was published in *Advanced Functional Materials* in September 2024.
Lo Presti, a Spider‑Man enthusiast, spent 18 months testing RSF mixtures with organic solvents. RSF exposed to acetone or ethanol forms semi‑solid hydrogels, but the transition can take hours. Adding dopamine—known for creating exceptionally strong adhesives—accelerated solidification by drawing water away from the fibroin, producing fibers that adhere strongly to surfaces, similar to barnacle adhesion.
The team extruded the solution through a coaxial needle, creating a thin stream enveloped in acetone. As the acetone evaporated, the fiber solidified upon contact. By incorporating chitosan, an insect exoskeleton derivative, the fibers gained up to 200‑fold tensile strength. A borate buffer further increased stickiness by 18‑fold. These enhancements enabled the fibers to lift objects up to 80 times their own weight, including a partially buried scalpel, a steel bolt, and a wooden block.
Lo Presti told *Tufts Now*: “Spiders spin silk directly from their glands, physically contacting surfaces to build webs. We are demonstrating a way to shoot a fiber from a device, then adhere to and pick up an object from a distance—essentially turning a natural principle into a superhero‑inspired technology.”
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In an episode of *The Official Marvel Podcast*, Professor Fiorenzo Omenetto of Tufts biomedical engineering highlighted the lab’s potential to create a wrist‑mounted web shooter. He emphasized that nature’s materials can perform unexpected feats. “Silk’s tensile strength and elasticity allow it to absorb energy and support heavy loads,” Omenetto explained. “When we engineer these materials, those properties carry over, enabling us to design systems that can hold substantial weight without breaking.”
Omenetto also noted that their lab has produced a lightweight web capable of bearing 4,000 times its weight. While spiders are less approachable than caterpillars, the underlying silk biology offers a promising route toward functional, high‑strength adhesives.
