Swedish researchers from the Royal Institute of Technology continue to work with wood materials at the nanoscale and are ready to boast of another achievement. Their latest version of the super-dense and ultra-strong “nano-wood” surpassed its record holder – spider silk. And thus became the most durable material on the planet of biological origin.
The subject of interest and work of Swedish scientists: cellulosic nanofibrils or CNF. These are tiny formations in the form of fibers, from which a skeleton of wood cells is formed at the micro level, which provides them with enviable strength and resistance to various kinds of loads. The task is to artificially give nanofibrils another form useful to humans.
To this end, the wood was slurried in channels of 1 mm width, in which deionized water with a low pH level flowed. The liquid stream washed out soft fractions and helped the nanofibers align themselves in a single direction, which made them form dense beams. After the final drying, the desired “nano-wood” was obtained, which is eight times denser than the raw material.
In the tests, the new material showed a tensile strength of 86 gigapascals and a tensile strength of 1.57 gigapascal. This exceeds the performance of many steel alloys, ceramics, fiberglass, plus Swedes significantly improved the strength of individual fibers compared to their previous work. And this means that it is not far off that day when the nano-wood will begin to be produced massively, for industrial needs.js.src = “&version=v2.8”; 'script', 'facebook-jssdk'));