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Citrate appears to control buckyball clumping but environmental concerns remain
Date:4/8/2008

the diameter of the aggregates becomes smaller. We want to understand the implications of this finding to the toxicity, movement, and fate of fullerenes in the environment.

Citric acid is well understood as a proxy for other kinds of organic acids, including those within cells. Some of the citrate-based spheres that Vikeslands group discovered are similar to what happens intercellularly when human cells are exposed to C60, he said. We think citrate and other organic acids with a carboxyl group make C60 more water soluble.

Vikesland will present Effects of small molecular weight acids on C60 aggregate formation and transport (ENVR 26) to the Division of Environmental Chemistry at 1:35 p.m. Sunday, April 6, in room 235 of the Morial convention Center. Authors of the paper are Vikesland, civil and environmental engineering Ph.D. student Xiaojun Chang of Luoyang, Henan, China, and masters degree student Laura K. Duncan of Augusta, Ga., and research assistant professor and TEM lab director Joerg R. Jinschek

Future environmental research will be done with simulated subsurface environments using a sand column to determine how these acidified masses move in ground water.

Vikesland will present Changs and his research about how C60 and citric acid interact to the Division of Colloid and Surface Chemistry on Wednesday, April 9, at 4:30 p.m. in 225 Morial Convention Center. He will present the results of various imaging analysis, such as atomic force microscopy. We have no answers but we have a hypothesis, still unproven, that there are weak interactions between citrate and individual carbon molecules that cause the spherical shape, Vikesland said.

The Vikesland group is exploring whether the C60-citrate interaction can be used to create reproducible shaped objects. Many fullerene-based products presently require solvents, which are then washed off. Unfortunately, the engineere
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Contact: Susan Trulove
STrulove@vt.edu
540-231-5646
Virginia Tech
Source:Eurekalert

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