Water types and their relaxation behavior in partially rehydrated CaFe-mixed binary oxide obtained from CaFe-layered double hydroxide in the 155-298 K temperature range

Valéria Bugris; Henrik Haspel; Ákos Kukovecz; Zoltán Kónya; Mónika Sipiczki; Pál Sipos; István Pálinkó

doi:10.1021/la4035276

Water types and their relaxation behavior in partially rehydrated CaFe-mixed binary oxide obtained from CaFe-layered double hydroxide in the 155-298 K temperature range

Langmuir. 2013 Oct 29;29(43):13315-21. doi: 10.1021/la4035276. Epub 2013 Oct 15.

Authors

Valéria Bugris¹, Henrik Haspel, Ákos Kukovecz, Zoltán Kónya, Mónika Sipiczki, Pál Sipos, István Pálinkó

Affiliation

¹ Department of Applied and Environmental Chemistry, University of Szeged , Rerrich tér 1, Szeged, H-6720 Hungary.

PMID: 24083485
DOI: 10.1021/la4035276

Abstract

Heat-treated CaFe-layered double hydroxide samples were equilibrated under conditions of various relative humidities (11%, 43% and 75%). Measurements by FT-IR and dielectric relaxation spectroscopies revealed that partial to full reconstruction of the layered structure took place. Water types taking part in the reconstruction process were identified via dielectric relaxation measurements either at 298 K or on the flash-cooled (to 155 K) samples. The dynamics of water molecules at the various positions was also studied by this method, allowing the flash-cooled samples to warm up to 298 K.