| Literature DB >> 26722745 |
Wycliffe K Kipnusu1, Mohamed Elsayed2,3, Wilhelm Kossack1, Sebastian Pawlus4, Karolina Adrjanowicz5, Martin Tress1, Emmanuel U Mapesa1, Reinhard Krause-Rehberg2, Kamil Kaminski4, Friedrich Kremer1.
Abstract
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 (T(g)) 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.Entities:
Keywords: Debye process; confinement; free volume; nanopores; structural relaxation
Year: 2015 PMID： 26722745 DOI： 10.1021/acs.jpclett.5b01533
Source DB: PubMed Journal: J Phys Chem Lett ISSN： 1948-7185 Impact factor: 6.475