NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2020, 11 (2), P. 205–213
Cryometry and excess thermodynamic functions in water soluble of the fullerenol C60(OH)24
N. A. Charykov – St. Petersburg State Technological Institute (Technical University); St. Petersburg Electrotechnical University “LETI”, ul. Professora Popova 5, 197376 St. Petersburg, Russia
K. N. Semenov – St. Petersburg State Technological Institute (Technical University); St. Petersburg State University; Pavlov First Saint Petersburg State Medical University L’va Tolstogo str. 6-8 Saint Petersburg, 197022, Russia
V. A. Keskinov – St. Petersburg State Technological Institute (Technical University), Moskovsky prospect, 26 Saint-Petersburg, 190013, Russia; keskinov@mail.ru
N. A. Kulenova – D. Serikbayev East Kazakhstan state technical university, A. K. Protozanov Street, 69, Ust-Kamenogorsk city, 070004, The Republic of Kazakhstan
Z. K. Shaimardanov – D. Serikbayev East Kazakhstan state technical university, A. K. Protozanov Street, 69, Ust-Kamenogorsk city, 070004, The Republic of Kazakhstan
B. K. Shaimardanova – D. Serikbayev East Kazakhstan state technical university, A. K. Protozanov Street, 69, Ust-Kamenogorsk city, 070004, The Republic of Kazakhstan
L.V. Gerasimova – St. Petersburg State Technological Institute (Technical University), Moskovsky prospect, 26 Saint-Petersburg, 190013, Russia
Ayat Kanbar – St. Petersburg State Technological Institute (Technical University), Moskovsky prospect, 26 Saint-Petersburg, 190013, Russia
D. G. Letenko – St. Petersburg State University of Architecture and Civil Engineering (SPSUACE), 2-nd Krasnoarmeiskaya St. 4, 190005 St. Petersburg, Russia
The temperature of water-ice crystallization initiation decreases (ΔT) were determined in the binary water solutions of water soluble fullerenol:
C60(OH)24 – H2O at 272.85–273.15 K. Solution concentrations (in molar fractions) vary over a wide range xnano-cluster = 5.0·10-6 – 1.6·10-4 a.un. Liquidus temperatures were determined with the help of Beckman thermometer with a linear resolution of the device scale ΔT/Δh≈0.01 K/mm (h – height of Hg capillary raising). For the thermodynamic description of the discussed systems, we have elaborated an original semi-empirical model, the virial decomposition asymmetric model (VD-AS), with assistance from partial molar functions of nano-clusters (activities and activity coefficients) were calculated. The Gibbs energies for the solutions and miscibility gap concentration regions were calculated. VD-AS model excellently describes pre-delamination or micro-heterogeneous-structure formation in the considered solutions. These calculations are confirmed by the dynamic light scattering data.
Keywords: fullerenol C60(OH)24, water solutions, cryometry, excess functions, delamination.
PACS 61.48.+c
DOI 10.17586/2220-8054-2020-11-2-205-213
