Title: Glass transition of one-dimensional molecular chains of p-nitroaniline confined in AlPO4-5 nanopores revealed by dielectric spectroscopy
Authors: W├╝bbenhorst, Michael ×
Klap, GJ
Jansen, JC
van Bekkum, H
van Turnhout, J #
Issue Date: Oct-1999
Publisher: Amer inst physics
Series Title: Journal of Chemical Physics vol:111 issue:13 pages:5637-5640
Abstract: The dynamics of molecular chains of hydrogen-bonded p-nitroaniline (pNA), confined in the one-dimensional pore system of AlPO4-5, was studied by broadband dielectric spectroscopy (10(-2)-10(6) Hz). Two relaxation processes were observed. A fast process (the alpha process) shows above 72 degrees C a Vogel-Fulcher-Tammann behavior typical of glass-forming materials, indicating cooperative dynamics of the "condensed" pNA chains. Below the glass temperature the alpha-relaxation peak broadens significantly and obeys an Arrhenius law. Both observations imply a change in length scale of cooperativity xi from a temperature-controlled to a chain-length-dependent one. The second relaxation process is tentatively assigned to structural relaxations of the AlPO4-5 host lattice itself, since it is also present in calcined (empty) crystals. (C) 1999 American Institute of Physics. [S0021- 9606(99)70437-X].
ISSN: 0021-9606
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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