Home > Press > CBEN: Buckyball Aggregates are Soluble, Antibacterial
Research Offers Clues About C60 Behavior in Natural Environments
CBEN: Buckyball Aggregates are Soluble, Antibacterial
Houston, TX | June 22, 2005
In some of the first research to probe how
buckyballs will interact with natural ecosystems, Rice University's Center
for Biological and Environmental Nanotechnology finds that the molecules
spontaneously clump together upon contact with water, forming nanoparticles
that are both soluble and toxic to bacteria.
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
"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.
"The antibacterial properties of the C60 aggregates also raise some
interesting questions," said Colvin. "We think it may be possible to harness
those properties for good applications, but we also advocate continued
research on the potentially negative effects that these materials could have
on the health of natural ecosystems."
Hughes, the study's lead author, said scientists don't yet know enough to
accurately predict what impact buckyballs will have on the environment or in
living systems, but he said the findings do illustrate the shortcomings of
federal guidelines for the handling and disposal of buckyballs, which are
subject to the same regulations as bulk carbon black.
"Not all carbon is the same," said Hughes. "Graphite and diamonds are both
bulk carbon, for example, but current standards call for handling them in
completely different ways. Our results suggest buckyballs also should be
Other Rice collaborators include CBEN Executive Director Kevin Ausman; Jane
Tao, assistant professor of biochemistry and cell biology; Wenhua Guo,
research scientist; Lawrence Alemany, senior research scientist; and
graduate students J.D. Fortner, D. Y. Lyon, C.M. Sayes, A.M. Boyd, J.C.
Falkner and E.M. Hotze.
About Rice University:
Rice University is consistently ranked one of America's best teaching and
research universities. It is distinguished by its: size - 2,850 undergraduates
and 1,950 graduate students; selectivity -10 applicants for each place in the
freshman class; resources‹an undergraduate student-to-faculty ratio of
6-to-1, and the fifth largest endowment per student among American
universities; residential college system, which builds communities that are
both close-knit and diverse; and collaborative culture, which crosses
disciplines, integrates teaching and research, and intermingles
undergraduate and graduate work. Rice's wooded campus is located in the
nation's fourth largest city and on America's South Coast.
For additional information, visit www.rice.edu
Copyright © Rice University
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