Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: S1.00183 : Evidences of Homogenous Nucleation in Nano Confined Secondary Alcohol
Author:
We have made comparative measurements to study the phase
transition of
physically confined 2-decanol in nano porous silica in the
presences of
excess bulk 2-decanol. We have systematically controlled the
amount of
excess bulk and studied how its existence influences freezing and
melting
temperatures. It appears that there is a lower limit in size,
where freezing
of the confined is not influenced by the presences or absence of
the bulk.
In our case this lower limit occurred with the average pore
diameter of 100
nm. For 2-decanol confined in pore sizes larger than 100 nm,
however, its
freezing occurred at T = -23\r{ }C, which was triggered by the
freezing of
the excess bulk. In absence of the bulk, freezing occurred at a
lower
temperature depending on size. Melting of the confined 2-decanol,
on the
other hand, was not influenced by the presences or absence of the
bulk.
Generally, the melting of the confined 2-decanol preceded the
melting of the
bulk. These suggest that the nucleation of 2-decanol confined to
pore sizes
less than 100 nm is homogenous and controlled by its extent of
supercooling.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.S1.183
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