Dynamics of glass-forming liquids. XVI. Observation of ultrastable glass transformation via dielectric spectroscopy

Chen, Z., Sepúlveda, A., Ediger, M. D. and Richert, R. (2013) Dynamics of glass-forming liquids. XVI. Observation of ultrastable glass transformation via dielectric spectroscopy. Journal of Chemical Physics, 138 12: 12A519.1-12A519.8. doi:10.1063/1.4771695

Attached Files (Some files may be inaccessible until you login with your UQ eSpace credentials)
Name Description MIMEType Size Downloads
UQ294373_OA.pdf Full text (open access) application/pdf 917.28KB 0

Author Chen, Z.
Sepúlveda, A.
Ediger, M. D.
Richert, R.
Title Dynamics of glass-forming liquids. XVI. Observation of ultrastable glass transformation via dielectric spectroscopy
Journal name Journal of Chemical Physics   Check publisher's open access policy
ISSN 0021-9606
1089-7690
Publication date 2013-02
Sub-type Article (original research)
DOI 10.1063/1.4771695
Open Access Status File (Publisher version)
Volume 138
Issue 12
Start page 12A519.1
End page 12A519.8
Total pages 8
Place of publication College Park, MD, United States
Publisher American Institute of Physics
Collection year 2014
Language eng
Abstract The transformation of vapor-deposited ultrastable glasses of indomethacin (IMC) into the supercooled liquid state near Tg is monitored by means of dielectric spectroscopy. Films with thickness between 400 and 800 nm are deposited on differential interdigitated electrode cells and their loss profiles are measured during isothermal annealing using a dual-channel impedance technique for frequencies between 0.03 and 100 Hz. All dielectric loss spectra observed during the transformation process can be explained by a volume fraction of the supercooled liquid that increases linearly with time. From the early stages of the transformation to the liquid that is formed via complete annealing of the ultrastable glass, the average dielectric relaxation time as well as the distribution of relaxation times of the liquid component are identical to those of the conventional liquid obtained by cooling the melt. The dependence of the transformation rate on the film thickness is consistent with a growth front mechanism for the direct conversion from the ultrastable glass to the equilibrium supercooled liquid. We conclude that the IMC liquid recovered from the ultrastable glass is structurally and dynamically identical to the conventional supercooled state.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 12A519

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Non HERDC
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 21 Mar 2013, 11:54:01 EST by Zhen Chen on behalf of School of Civil Engineering