Schematic to display the mesoporous structures in wood where the cell walls are aligned vertically. After lignin is removed and the index-matching polymer is filled in, the thick (up to centimeter) piece of wood becomes a highly transparent structural material. b) Pictures to show that wood becomes highly transparent after the two steps.
Materials scientist Liangbing Hu and his team at the University of Maryland, College Park, have removed the molecule in wood, lignin, that makes it rigid and dark in color. They left behind the colorless cellulose cell structures, filled them with epoxy, and came up with a version of the wood that is mostly see-thru. “It can be used in automobiles when the wood is made both transparent and high strength.” said Dr. Mingwei Zhu. “You could also use it as a unique building material.”
Remember “xylem” and “phloem” from grade-school science class? These structures pass water and nutrients up and down the tree. Hu and his colleagues see these as vertically aligned channels in the wood, a naturally-grown structure that can be used to pass light along, after the wood has been treated.
Schematic to illustrate two types of wood blocks that can be cut from tree trunk, where the radially cut piece is named as “R” and the longitudinal one “L.” b) In R-wood, the lumina in wood are perpendicular to the plane.
The resulting wood had both high transparency and high haze, the quality of scattering light. This would be useful, said Hu, in making devices comfortable to look at. It would also help solar cells trap light – light could easily enter through the transparent function, but the high haze would keep the light bouncing around near where it would be absorbed by the solar panel.
The transmittance measurement setup for transparent wood with two different anisotropic structures.
They compared how the materials performed and how light worked its way through the wood when they sliced it 2 ways – one with the grain of the wood, so that the channels passed through the longest dimension of the block. And they also tried slicing it against the grain, so that the channels passed through the shortest dimension of the block. The short channel wood proved slightly stronger and a little less brittle. But though the natural component making the wood strong had been removed, the addition of the epoxy made the wood 4-6 times tougher than the untreated version.
Then they investigated how the different directions of the wood affected the way the light passed through it. When laid down on top of a grid, both kinds of wood showed the lines clearly. When lifted just a touch above the grid, the long-channel wood still showed the grid, just a little bit more blurry. But the short channel wood, when lifted those same few millimeters, made the grid completely invisible.
Right now the blocks of wood the team is testing are about 4 inches wide, but Hu says the process “completely scalable” to larger pieces that could make up bigger building blocks. The group is investigating whether it would be feasible to manufacture the transparent wood, which can be potentially used as a building material in about 5 years. https://www.nanocenter.umd.edu/news/news_story.php?id=9672
http://onlinelibrary.wiley.com/doi/10.1002/adma.201600427/abstract
Recent Comments