Method assembles cellulose nanofibres into a material stronger than spider silk

May 9, 2018, KTH Royal Institute of Technology
SEM image of the cross-section of the fibre, 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 (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 for use in airplanes, cars, furniture and other products.

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

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.

This understanding enabled a new process, which involves controlling the flow of nanofibres suspended in water in a 1 mm wide channel milled in stainless steel. Connecting flows of deionized water and low pH water help align the nanofibres in the right direction and enable the supramolecular interactions between CNFs to self-organize into a well-packed state where they are joined together.

"This discovery is made possible by understanding and controlling the key fundamental parameters essential for perfect nanostructuring, such as particle size, interactions, alignment, diffusion, network formation and assembly," Söderberg says.

Söderberg says the study opens the way for developing material that can be used for larger structures while retaining the nanofibres' tensile strength and ability to withstand mechanical load. The process can also be used to control nanoscale assembly of carbon tubes and other nano-sized fibres.

Measurements of the material were reported for tensile stiffness, 86 gigapascals (GPa), and for tensile , 1.57 GPa.

Explore further: Silk proteins paired with renewable wood nanocellulose to produce the strongest artificial spider silk yet

More information: Near-Perfect Assembly of Nanoscale Building Blocks into Macroscopic Materials ACS Nano, dx.doi.org/10.1021/acsnano.8b01084

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rickenbacker63
not rated yet May 09, 2018
Wow. Even spiders are having their jobs outsourced.
xponen
not rated yet May 10, 2018
With material effectively lighter than a Carbon-Fibre composite then it enable you to improve existing applications or create a new one that wasn't possible before, such as: a lighter fuel-tank for a high performing rockets, or lighter car chassis for a normal car or even flying cars, and definitely a lighter aircraft chassis for a conventional & electric aircraft.

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