Confinement for More Space: A Larger Free Volume and Enhanced Glassy Dynamics of 2-Ethyl-1-hexanol in Nanopores
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- 作者：Wycliffe K. Kipnusu ; Mohamed Elsayed ; Wilhelm Kossack ; Sebastian Pawlus ; Karolina Adrjanowicz ; Martin Tress ; Emmanuel U. Mapesa ; Reinhard Krause-Rehberg ; Kamil Kaminski ; Friedrich Kremer
- 刊名：The Journal of Physical Chemistry Letters
- 出版年：2015
- 出版时间：September 17, 2015
- 年：2015
- 卷：6
- 期：18
- 页码：3708-3712
- 全文大小：348K
- ISSN：1948-7185
文摘
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 伪-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.