Thermal transformations of selected transition metals oxyhydroxides |
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Authors: | Przepiera Krystyna Przepiera A |
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Institution: | (1) Centro de Quìmica-Fisica Molecular, Complexo I, IST, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;(2) Departmento de Química, Centro de Quimica Fina e Biotechnologia de Cienicias e Technologia, Universiade Nova de Lisboa, 2825-114 Caparica, Portugal |
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Abstract: | We investigated the features of the glass transition relaxation of two room temperature ionic liquids using DSC. An important
observation was that the heat capacity jump, that is the signature of the glass transition relaxation, shows a particularly
strong value in this type of new and promising materials, candidates for a range of applications. This suggests a high degree
of molecular mobility in the supercooled liquid state. The study of the influence of the heating rate on the temperature location
of the glass transition signal, allowed the determination of the activation energy at the glass transition temperature, and
the calculation of the fragility index of these two ionic glass-formers. It was concluded that this kind of materials belong
to the class of relatively strong glass-forming systems.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | fragility glass forming liquid ionic liquid DSC RTIL supercooled liquids |
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