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Study of water in Ca-montmorillonite by thermal analysis and positron annihilation lifetime spectroscopy

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Abstract

The aim of this study is to characterize adsorbed liquid in montmorillonite structure for different levels of adsorption by both thermoanalytical and microstructural methods. Montmorillonite of Ca type is used for the analysis. Water desorption process occurring typically between 50 and 180 °C is analysed in details by thermogravimetric analysis. Thermal response of adsorbed water for the selected steps of desorption process is studied by differential scanning calorimetry. Corresponding characterization of free volume is performed by positron annihilation lifetime spectroscopy. An attempt to determine a correlation of characterization method results is provided.

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Acknowledgements

Work was partially supported by projects VEGA 2/0127/17, VEGA 2/0157/17, APVV-16-0369 and APVV-15-0621.

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Authors and Affiliations

  1. Institute of Physics, Slovak Academy of Sciences, Dúbravská 9, 845 11, Bratislava, Slovakia

    Igor Maťko, Ondrej Šauša & Katarína Čechová

  2. Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina CH-2, 842 15, Bratislava, Slovakia

    Karol Jesenák

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  1. Igor Maťko
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  2. Ondrej Šauša
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  3. Katarína Čechová
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  4. Karol Jesenák
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Correspondence to Igor Maťko.

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Maťko, I., Šauša, O., Čechová, K. et al. Study of water in Ca-montmorillonite by thermal analysis and positron annihilation lifetime spectroscopy. J Therm Anal Calorim 133, 247–254 (2018). https://doi.org/10.1007/s10973-018-7145-7

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  • DOI: https://doi.org/10.1007/s10973-018-7145-7

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