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Observation of nanophase segregation in LiCl aqueous solutions from transient grating experiments

By L. E. Bove, C. Dreyfus, R. Torre and R. M. Pick

Abstract

International audienceTransient grating experiments performed on supercooled LiCl, RH2O solutions with R > 6 reveal the existence of well resolved, short time, extra signal which superposes to the normal signal observed for the R = 6 solution and for homogenous glass forming systems. This extra signal shows up below 190 K, its shape and the associated timescale depend only on temperature, while its intensity increases with R. We show that the origin of this signal is a phase separation between clusters with a low solute concentration and the remaining, more concentrated, solution. Our analysis demonstrates that these clusters have a nanometer size and a composition which are rather temperature independent, while increasing R simply increases the density of these cluster

Topics: [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: American Institute of Physics
Year: 2013
DOI identifier: 10.1063/1.4813283
OAI identifier: oai:HAL:hal-00982197v1
Provided by: Hal-Diderot
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