Melting of mixtures in silica nanopores

Czwartos, Joanna; Sliwinska-Bartkowiak, Malgorzata; Coasne, Benoit; Gubbins, Keith E.

doi:10.1351/PAC-CON-09-01-15

Pure Appl. Chem., 2009, Vol. 81, No. 10, pp. 1953-1959

http://dx.doi.org/10.1351/PAC-CON-09-01-15

Published online 2009-10-13

Melting of mixtures in silica nanopores

Joanna Czwartos¹, Malgorzata Sliwinska-Bartkowiak¹*, Benoit Coasne² and Keith E. Gubbins³

¹ Faculty of Physics, Adam Mickiewicz University, Poznan, Poland
² Institut Charles Gerhardt Montpellier, CNRS and Université Montpellier 2, Montpellier, France
³ Center for High Performance Simulation and Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695‑7905, USA

Abstract: We report experimental measurements of the melting of mixtures confined in nanoporous materials. Dielectric relaxation spectroscopy (DRS) was used to determine the solid–liquid phase diagram of bromobenzene/carbon tetrachloride (C₆H₅Br /CCl₄) mixtures confined in controlled pore glasses (CPGs) with an average pore diameter H = 7.5 nm. Our results show that the phase diagram of the confined mixture is of the same type as that for the bulk, but the solid–liquid coexistence lines are located at different temperatures. These results are compared with those previously obtained for CCl₄/C₆H₆ mixtures in activated carbon fibers (ACFs).