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Current issue   Ukr. J. Phys. 2014, Vol. 59, N 1, p.69-78

    Paper

Grosu Ya.G.1, Eroshenko V.A.1, Ievtushenko O.V.1,2,3, Nedelec J.-M.2,3, Grolier J.-P.E.2,3

1 National Tehnical University of Ukraine "Kyiv Politechnical Institute"
Laboratory of Termo-molecular Energetics
(37, Peremoga Ave., Kyiv 03056, Ukraine; e-mail: eroshenko@kpi.ua)
2 Clermont University, ENSCCF, Institute of Chemistry of Clermont-Ferrand
(63000 Clermont-Ferrand, France)
3 CNRS, UMR 6296, ICCF
(24, Landais Av, 63171 Aubière, France)

Anomalous Negative Thermal Expansion in a Condensed Heterogeneous Lyophobic System

Section: Nanosystems
Original Author's Text: Ukrainian

Abstract: A reduction in the volume of a heterogeneous lyophobic system (HLS) at the temperature grouth (the so-called negative thermal expansion, NTE) is experimentally observed. For the investigated HLS "silicalite-1 + water", the NTE effect is shown to exceed the corresponding values observed for the known materials by more than an order of magnitude. The physical principles of this phenomenon are explained, and a mathematical model for its description is proposed.

Key words: phase interface, porous body, PV-isotherm, intrusion/extrusion, simulation, experiment.