Brillouin scattering study of methanol-water solutions under pressure

• Published in: Physica status solidi. C Vol. 1; no. 11; pp. 3178 - 3181
• Main Authors: Jiménez-Ruiz, M., Jiménez-Riobóo, R. J., Tissen, V., Ramos, M.A., Schober, H.
• Format: Journal Article
• Language: English
• Published: Berlin WILEY-VCH Verlag 01.11.2004; WILEY‐VCH Verlag
• Subjects: 62.20.Dc; 62.50.+p; 78.35.+c
• ISSN: 1610-1634; 1610-1642
• DOI: 10.1002/pssc.200405281

We have performed a Brillouin scattering study of methanol‐water solutions at different molar fraction concentrations of methanol as a function of pressure. For that purpose a diamond anvil cell was used and pressures up to 25 kbar were reached. All measurements were carried out at ambient temperature. The data at P = 1 bar are in accordance with previous Brillouin scattering results, showing a maximum well defined in the elastic constants in the low concentrated solution (methanol poor) and afterwards a decrease for higher methanol concentrations. However, our pressure study for the different methanol concentrations reveals a change in this behavior at P∼ 4 kbar. The results indicate that the applied pressure induces a change in the elastic constants that could be followed in two well defined regimes: from ambient pressure up to 4 kbar and from this pressure to 10 kbar. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)