KTH researcher develops first wood xerogel
Researchers at KTH have produced a xerogel made from wood – the material enables more energy-efficient production of high-quality transparent wood.
”The significant advance is that our mesoporous wood xerogel allowed infiltration of polymer resin at ambient condition without the use of solvent or vacuum,” says Qi Zhou, professor at the Division of Glycoscience.
Aerogel and xerogel are porous and solid gel materials with very low density. They are produced by drying wet gels while the solid structure is kept. The key difference between aerogel and xerogel is that aerogels form when the liquid from the gel is extracted at a supercritical state, whereas xerogels can be prepared by using common oven dryers or even by air drying. This means that xerogels have potentially no limitation in dimension and are scalable, according to Qi Zhou.
“The aim of our research in this project was to prepare highly mesoporous wood xerogel and demonstrate its application in fabrication of optically transparent wood composite with high wood volume fraction.”
Qi Zhou’s teams’ wood composites have a wood volume fraction as high as 50 percent and is original in terms of both material efficiency and high performance perspectives. Due to the highly porous nature of wood, transparent wood usually contains less than 10 percent wood mass, leaving the major component to be the polymer matrix.
“The optical property of the transparent wood composites is also significant. The high optical transmittance of the wood xerogel composites remained at high wood volume fractions, suggesting that aggregation of cellulose microfibrils was not induced by compression of the wood xerogel. In other words, the mesoporosity of wood cell wall was preserved upon mechanical compression of wood xerogel,” says Qi Zhou.
He thinks that wood xerogel will be a new material platform for development and fabrication of functional materials.
“We demonstrated its potential application in polymer composite materials. Other properties of wood xerogel including thermal, acoustic, fluidic and ionic properties are yet to be explored.”
Text: Jon Lindhe
For more information, contact Qi Zhou at 08 - 790 96 25 or firstname.lastname@example.org .