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Comparison Between the Phase Transition of Physically Confined Cyclohexane and 1-Decanol inside Nano Porous Silica

Published online by Cambridge University Press:  21 February 2012

Hillary C. Bauer ,
Alexandrea D. Safiq ,
Jargalsaikhan Dulmaa ,
Amer S. Khraisat  and
Samuel Amanuel
Hillary C. Bauer
Affiliation:
Department of Physics and Astronomy, Union College, Schenectady, NY 12308, U.S.A.
Alexandrea D. Safiq
Affiliation:
Department of Physics and Astronomy, Union College, Schenectady, NY 12308, U.S.A.
Jargalsaikhan Dulmaa
Affiliation:
Department of Physics and Astronomy, Union College, Schenectady, NY 12308, U.S.A.
Amer S. Khraisat
Affiliation:
Department of Physics and Astronomy, Union College, Schenectady, NY 12308, U.S.A.
Samuel Amanuel
Affiliation:
Department of Physics and Astronomy, Union College, Schenectady, NY 12308, U.S.A.
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Abstract

The thickness of non-freezing interfacial 1-decanol molecules has been estimated to be 1.44 ± 0.07 nm. This is smaller than what is estimated for cyclohexane, 2.25 ± 0.14nm. Furthermore, these interfacial molecules have higher density than corresponding bulk cyclohexane and 1-decanol, respectively. However, the change in density of the interfacial molecules is more significant in the case of cyclohexane than 1-decanol. This suggests that the cyclohexane molecules near the walls of the pore are more tightly packed than 1-decanol molecules. Presumably, this is due to the difference in size and shape of the molecules. Cyclohexane, a more spherical molecule, can easily be packed in smaller pores than the longer 1-decanol.

Keywords

calorimetryphase transformationnanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1423: Symposium RR – Dynamics in Confined Systems and Functional Interfaces , 2012 , mrsf11-1423-rr06-04
Copyright
Copyright © Materials Research Society 2012

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References

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