TY - JOUR
T1 - Surface freezing in n-alkane solutions: The relation to bulk phases
AU - Sloutskin, E.
AU - Sirota, EB
AU - Kraack, H
AU - Ocko, BM
AU - Deutsch, M.
PY - 2001/9/1
Y1 - 2001/9/1
N2 - Surface freezing (SF) was investigated in tricosane-dodecane alkane solutions as a function of temperature (T) and molar concentration of tricosane (φ), using surface tension and synchrotron x-ray surface diffraction techniques. A crystalline SF monolayer, having a rotator RII structure, was found to exist for 35°C<~T<~50°C and 0.3<~φ<~1. The extended temperature range allowed to determine the linear-expansion coefficient of the SF monolayer, (dd/dT)/d=6.5×10−4°C−1. A simple thermodynamical model based on the theory of ideal solutions is shown to account well for the φ dependence of the SF temperature Ts(φ). The study shows that the temperature range of existence of the surface frozen layer at each φ, the φ range over which SF is observed, and the bulk solidification behavior, are intimately related. All are determined by the rotator-liquid dissolution line TdR(φ).
AB - Surface freezing (SF) was investigated in tricosane-dodecane alkane solutions as a function of temperature (T) and molar concentration of tricosane (φ), using surface tension and synchrotron x-ray surface diffraction techniques. A crystalline SF monolayer, having a rotator RII structure, was found to exist for 35°C<~T<~50°C and 0.3<~φ<~1. The extended temperature range allowed to determine the linear-expansion coefficient of the SF monolayer, (dd/dT)/d=6.5×10−4°C−1. A simple thermodynamical model based on the theory of ideal solutions is shown to account well for the φ dependence of the SF temperature Ts(φ). The study shows that the temperature range of existence of the surface frozen layer at each φ, the φ range over which SF is observed, and the bulk solidification behavior, are intimately related. All are determined by the rotator-liquid dissolution line TdR(φ).
UR - http://www.scopus.com/inward/record.url?scp=35441897&partnerID=8YFLogxK
M3 - Article
VL - 64
JO - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
JF - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
IS - 3
ER -