Confinement for More Space: A Larger Free Volume and Enhanced Glassy Dynamics of 2-Ethyl-1-hexanol in Nanopores

Wycliffe K. Kipnusu, Mohamed Elsayed, Wilhelm Kossack, Sebastian Pawlus, Karolina Adrjanowicz, Martin Tress, Emmanuel U. Mapesa, Reinhard Krause-Rehberg, Kamil Kaminski, Friedrich Kremer

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    Broadband dielectric spectroscopy and positron annihilation lifetime spectroscopy are employed to study the molecular dynamics and effective free volume of 2-ethyl-1-hexanol (2E1H) in the bulk state and when confined in unidirectional nanopores with average diameters of 4, 6, and 8 nm. Enhanced α-relaxations with decreasing pore diameters closer to the calorimetric glass-transition temperature (Tg) correlate with the increase in the effective free volume. This indicates that the glassy dynamics of 2D constrained 2E1H is mainly controlled by density variation.
    TidsskriftJournal of Physical Chemistry Letters
    Udgave nummer18
    Sider (fra-til)3708–3712
    StatusUdgivet - 2015

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