Method assembles nanofibers into a material stronger than spider silk

SEM image of the cross-section of the fiber, showing the aligned nanofibrils. Credit: KTH The Royal Institute of Technology

Researchers in Sweden have produced a bio-based material that is reported to surpass the strength of all known bio-based materials whether fabricated or natural, including wood and spider silk.

Working with cellulose nanofibers (CNF), the essential building block of wood and other plant life, the researchers report that they have overcome the difficulty in translating the incredible mechanical properties of these nanofibres into larger, lightweight materials for use in airplanes, cars, furniture and other products.

“The bio-based nano-cellulose fibers fabricated here are 8 times stiffer and have strengths higher than natural dragline spider silk fibers, generally considered to be the strongest bio-based material,” says corresponding author Daniel Söderberg, a researcher at KTH Royal Institute of Technology. “The specific strength is exceeding that of metals, alloys, ceramics and E-glass fibers.”

Published in the Journal of American Chemical Society (ACS Nano), the study describes a new method that mimics nature’s ability to arrange cellulose nanofibres into almost perfect macroscale arrangements.

The reported progress results from the development of insights into the way physics controls structuring of components, such as CNF, at the nanoscale during fabrication.

Read more: Method assembles cellulose nanofibres into a material stronger than spider silk

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