Keeping Wood Preservatives Where They Belong: In the Wood
Pressure-treated lumber is generally safe, but chemicals can leach out. Michigan Tech researchers are using nanotechnology to keep the chemicals inside, where they can do no harm to the environment.
April 6, 2012—
Pressure-treated wood is great stuff, but the chemicals used to preserve it from decay can leach out, where they can be toxic to bugs, fungi and other hapless creatures that have the bad luck to be in the neighborhood. Now, a team of Michigan Technological University scientists has used nanotechnology to keep the chemicals inside the wood where they belong.
“It’s a new method that uses nanoparticles to deliver preservatives into the lumber,” said chemistry professor Patricia Heiden. “In our experiments, it reduced the leaching of biocides by 90 percent.”
The nanoparticles are tiny spheres of gelatin or chitosan (a material found in the shells of shrimp and other shellfish) chemically modified to surround the fungicide tebuconazole. The little spheres require no special handling.
“You just pressure-treat the wood in the usual way,” Heiden said.
The initial tests show that the nanoparticle-treated wood is just as resistant to rot and insects as conventionally treated lumber. The researchers are now testing the wood in the warm, wet weather of Hawaii.
The research is funded by the US Environmental Protection Agency. Also contributing to the project are chemistry PhD students Ning Chen and Xiaochu Ding, and, from the School of Forest Research and Environmental Science, Research Engineer/Scientist II Dana Richter, Senior Research Engineer/Scientist Glenn Larkin, Assistant Research Scientist Erik Keranen and Professor Peter Laks.
Michigan Technological University (www.mtu.edu) is a leading public research university developing new technologies and preparing students to create the future for a prosperous and sustainable world. Michigan Tech offers more than 120 undergraduate and graduate degree programs in engineering; forest resources; computing; technology; business; economics; natural, physical and environmental sciences; arts; humanities; and social sciences.