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An Undercooling Effect in Porous Glass: From Bulk to the Confined

Published online by Cambridge University Press:  15 February 2011

Y. Xue ,
R. Mu ,
D. O. Henderson  and
D. O. Frazier
Y. Xue
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208
R. Mu
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208
D. O. Henderson
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208
D. O. Frazier
Affiliation:
Space Science Laboratory, Chemistry and Polymeric Materials Branch, Marshall Space Flight Center, Huntsville, AL 35812
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Abstract

The Thermodynamic properties of TNT physically confined in 5, 10, and 20 nm pores were investigated by Differential Scanning Calorimetry (DSC). Depending upon the pore size and the sample condition, different aspects of the thermodynamic properties of the confined TNT were illustrated. The freezing transition of the confined TNT in 10, 20 nm pores can be triggered by excess bulk TNT on the outer surface. The sharp freezing transition of the TNT in 20 nm pores without the presence of the bulk suggests that the confined TNT maintains its interconnectivity during the transition. The confined TNT in 10 nm pores without bulk on surface failed to freeze during the cooling run up to 100 K with cooling rates ranging from 10 K/min. - 1 K/min. However, a sharp crystallization peak was observed upon heating. When the TNT is confined in 5 nm pores, the confined TNT is incapable of freezing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 253
Copyright
Copyright © Materials Research Society 1995

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