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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2015, 6 (2), P. 294–298

Dependence of the dimension of the associates of water-soluble tris-malonate of light fullerene — C60 [= C(COOH)2]3 in water solutions at 25 °C

K. N. Semenov – St. Petersburg State University, Saint-Petersburg, Russia
N. A. Charykov – St. Petersburg State Technological Institute (Technical University); St. Petersburg State Electro-Technical University (LETI), Saint-Petersburg, Russia
A. S. Kritchenkov – St. Petersburg State University, Saint-Petersburg, Russia
I. A. Cherepkova – St. Petersburg State Technological Institute (Technical University), Saint-Petersburg, Russia
O. S. Manyakina – St. Petersburg State Technological Institute (Technical University), Saint-Petersburg, Russia
D. P. Tyurin – St. Petersburg State Technological Institute (Technical University), Saint-Petersburg, Russia
A. A. Shestopalova – St. Petersburg State Technological Institute (Technical University), Saint-Petersburg, Russia
V. A. Keskinov – St. Petersburg State Technological Institute (Technical University), Saint-Petersburg, Russia; keskinov@mail.ru
K. V. Ivanova – St. Petersburg State Technological Institute (Technical University), Saint-Petersburg, Russia
N. M. Ivanova – St. Petersburg State University, Saint-Petersburg, Russia
D. G. Letenko – St. Petersburg State University of Architecture and Civil Engineering, Saint-Petersburg, Russia
V. A. Nikitin – Peter the Great St. Petersburg Polytechnic University, Saint-Petersburg, Russia
E. L. Fokina – St. Petersburg State University, Saint-Petersburg, Russia
M. S. Gutenev – Peter the Great St. Petersburg Polytechnic University, Saint-Petersburg, Russia

Investigation of the concentration dependence of the size and type C60 [= C(COOH)2]3 aggregation in aqueous solutions at 25 °C was accomplished with the help of a dynamic light scattering method. It was determined that three types of aggregates are realized in the solutions. The average number of C60 [= C(COOH)2]3 molecules in smaller aggregates and all types of aggregates were calculated. One can see that over the whole concentration range, from 0.01 to 10 g/dm3, aqueous solutions of C60 [= C(COOH)2]3 are characterized by sub-micro-heterogeneous behavior (because second-type aggregates with the linear dimensions – hundreds of nm are formed in all solutions). Additionally, the most concentrated solution (C = 10 g/dm3) is characterized by micro-heterogeneous or colloid behavior (because third-type aggregates with the linear dimensions on the order of µm – are formed). In order to describe or explain such behavior, a stepwise aggregation model was invoked.

Keywords: tris-malonate of light fullerene, method of the dynamic light scattering.

PACS 61.48.+c

DOI 10.17586/2220-8054-2015-6-2-294-298

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