The research challenges conventional wisdom: since buckyballs are notoriously insoluble by themselves, most scientists had assumed they would remain insoluble in nature. The findings also raise questions about how the buckyball aggregates dubbed nano-C60 will interact with other particles and living things in natural ecosystems.
The findings appear in the June 1 issue of the journal Environmental Science & Technology.
"The fact that nano-C60 dissolves in water raises questions about water as a vector for the movement of these types of materials," said Vicki Colvin, CBEN director, professor of chemistry and a co-author on the study.
Buckyballs are soccer ball-shaped molecules of 60 carbon atoms that were discovered at Rice in 1985. While a few companies are already using trace amounts of buckyballs in products, large-scale production of buckyballs is still a year or two away. Ultimately, companies hope to use buckyballs in everything from pharmaceuticals to sporting goods.
The research team was led by Georgia Tech environmental engineer Joseph Hughes and included almost a dozen Rice collaborators. They found that nano-C60 readily dissolves in water. The clumps, which measured between 25 and 500 nanometers in diameter, were also found to persist for up to 15 weeks in freshwater.
The researchers also exposed nano-C60 to two common types of soil bacteria. They found the particles inhibited both the growth and respiration of the bacteria at very low concentrations -- as little as 0.5 parts per million.