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Ordering of mixed paramagnetic and diamagnetic fullerenols in aqueous solutions under magnetic field

V. T. LEBEDEV1,* , Yu. V. KULVELIS1, V. V. RUNOV1, V. P. SEDOV1, A. A. SZHOGINA1

Affiliation

  1. Petersburg Nuclear Physics Institute, NRC Kurchatov Instutute, 188300 Gatchina, Leningrad distr., Russia

Abstract

Mixtures of paramagnetic Gd@C82(OH)X and diamagnetic С82(OH)X (X ~ 30) fullerenols in water have been studied by polarized neutrons at the concentrations С = 0.04 – 2 % wt. At ambient temperature the concentration increase and magnetic field B = 0.001 – 1.0 Тesla strengthening has initiated a growth of molecular correlations at the scale RC ~15-20 nm, when the aggregation number achieved very high magnitudes ~ 5∙104 while rather small contribution of nuclear-magnetic interference (≤ 0.1 %) to the total scattering cross section was detected. Thus, in these systems a molecular self-assembly has dominated. This molecular ordering under magnetic field seems to be crucial for their ability to provide a high contrast in medical MRI-diagnostics..

Keywords

Fullerenes, Small angle neutron scattering, Structure, Solutions.

Submitted at: May 7, 2015
Accepted at: June 24, 2015

Citation

V. T. LEBEDEV, Yu. V. KULVELIS, V. V. RUNOV, V. P. SEDOV, A. A. SZHOGINA, Ordering of mixed paramagnetic and diamagnetic fullerenols in aqueous solutions under magnetic field, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 7-8, pp. 1193-1197 (2015)