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Science 9 March 2001:
Vol. 291. no. 5510, pp. 1944 - 1947
DOI: 10.1126/science.291.5510.1944
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Reports
Spherical Bilayer Vesicles of Fullerene-Based Surfactants in Water: A Laser Light Scattering Study
Shuiqin Zhou,1
Christian Burger,1
Benjamin Chu,1*
Masaya Sawamura,2
Noriaki Nagahama,2
Motoki Toganoh,2
Ulrich E. Hackler,2
Hiroyuki Isobe,2
Eiichi Nakamura2
The low solubility of fullerenes in aqueous solution limits their
applications in biology. By appropriate substitution, the fullerenes
can be transformed into stabilized anions that are water soluble and
can form large aggregated structures. A laser light scattering study of
the association behavior of the potassium salt of pentaphenyl fullerene
(Ph5C60K) in water revealed that the
hydrocarbon anions Ph5C60 associate into
bilayers, forming stable spherical vesicles with an average
hydrodynamic radius and a radius of gyration of about 17 nanometers at
a very low critical aggregation concentration of less than
107 moles per liter. The average aggregation number of
associated particles in these large spherical vesicles is about
1.2 × 104.
1 Department of Chemistry, State University of
New York, Stony Brook, NY 11794, USA.
2 Department
of Chemistry, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
*
To whom correspondence should be addressed. E-mail:
bchu{at}notes.cc.sunysb.edu
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