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If Shin wants to capture a negative impression, he can alter the pH to favor the base end of the scale. The acid-leaching method yields an identical, positive reproduction of the wood. The intricate network of microchannels and pores in plant matter provide enormous surfaces-in wood, 1 gram of material flattened out would cover a football field-that may prove useful in industrial chemical separations or filtering pollutants from gaseous effluents. The material "replicates exactly the wood architecture," according to Shin.Īlthough SiC chips are unlikely to replace computer chips, materials scientists are interested in the novel properties of ceramics built on templates of wood and, in Shin's lab, other natural materials such as pollen and rice hulls. Instant petrified wood, the silica taking up permanent residence with the carbon left in the cellulose to form a new silicon carbide, or SiC, ceramic. Back at PNNL, they gave a 1 centimeter cube of wood a two-day acid bath, soaked it in a silica solution for two more (for best results, repeat this step up to three times), air-dried it, popped it into an argon-filled furnace gradually cranked up to 1,400 degrees centigrade to cook for two hours, then let cool in argon to room temperature. There they picked up their raw material: pine and poplar boards. Shin's petrified wood journey began in a less dramatic fashion, a few minutes away at Lowe's, Shin's group reports in the current issue of the journal Advanced Materials, in the do-it-yourselfer chain's lumberyard. There, trees likely felled in a cataclysmic eruption and, buried without oxygen beneath lava, leached out their woody compounds and sponged up the soil's minerals over the eons. Yongsoon Shin and colleagues at the Department of Energy lab have converted wood to mineral, achieving in days what it takes nature millions of years to do in such places as the Gingko Petrified Forest, an hour up the Columbia River. Could a Silicon Forest in Washington be next? A team of materials scientists from Pacific Northwest National Laboratory is on it. RICHLAND, Wash.-California has Silicon Valley. (Photo credit: Pacific Northwest National Laboratory.)įull size image available through contact Interested in the novel properties of ceramics built on wood templates. Natural process that takes millions of years. Section of wood that was artificially petrified in days, mimicking a SOAKED, DRIED & PETRIFIED: An electron microscopic image shows a cross
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