NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2014, 5 (1), P. 167–171
SYNERGISTIC INFLUENCE OF FLUORINE AND HYDROGEN ON PROCESSES OF THERMAL TRANSFORMATIONS OF CARBONCONTAINING SYSTEMS UNDER HIGH PRESSURES
V. A. Davydov – L.F.Vereshchagin Institute for High Pressure Physics of the RAS, Troitsk, Moscow; vdavydov@hppi.troitsk.ru
A.V. Rakhmanina – L.F.Vereshchagin Institute for High Pressure Physics of the RAS, Troitsk, Moscow; avrakhman@yandex.ru
V. N. Agafonov – GREMAN, UMR CNRS-CEA 6157, Université F. Rabelais, Tours; agafonov@univ-tours.fr
V. N. Khabashesku – Department of Chemical and Biomolecular Engineering, University of Houston; valery@uh.edu
Thermal transformations of naphthalene (C10H8), octafluoronaphthalene (C10F8) and their binary mixtures at 8.0 GPa have been investigated by X-ray diffraction, Raman spectroscopy, scanning and transmission microscopies. As a result, the pronounced synergistic effect of fluorine and hydrogen on mechanisms, p, T parameters and products of pressure-temperature-induced transformations of carbon-containing systems has been established. Simultaneous presence of fluorine and hydrogen gives rise to significant reduction of the temperature thresholds (TT) for carbonization, graphitization and diamond formation in C10H8 – C10F8 mixtures in comparison with the TT values for pure C10H8 and C10F8 at the same pressure. This synergistic effect manifests itself also in the simultaneous presence in the products of transformation of both nano- and micrometer-sized diamond fractions. The reasons of formation of different diamond fractions in the products of binary mixture treatment are discussed in this work.
Keywords: High pressure, High temperature, Transformations, Nanocarbon materials.
PACS 62.50.-p, 81.07.-b, 81.05.ug