期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 112, 期 7, 页码 2618-2623出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp7105605
关键词
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The quasi-liquid layer (QLL) on the surface of water-ice has been studied by ice chromatography, in which water-ice particles are used as a stationary phase. We have, in previous papers, demonstrated that solutes are retained on the ice stationary phase with hexane-based mobile phases and have revealed that the hydrogen bonds between a solute and the dangling bonds on the surface of water-ice are responsible for retention at such low temperatures as -12.0 to -5.0 degrees C. However, increasing the temperature allows the shift of the principal retention mechanism from the hydrogen-bond adsorption to the partition into the QLL; this has been confirmed by drastic changes in the retention of probe solutes. The threshold temperature, at which the retention shift occurs, depends on the concentration and type of a polar component added to the mobile phase. Thus, the QLL developed in the present system contains not only water but also a polar component added to the mobile phase. This phenomenon occurs at a temperature much lower than that predicted from the lowering of the freezing point due to the dissolution of a polar component in water and, thus, is a surface process rather than a bulk phase transition.
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