Murakami Ryo, Sakamoto Hiroyasu, Hayami Yoshiteru, Matsubara Hiroki, Takiue Takanori, Aratono Makoto
Department of Chemistry, Faculty of Sciences, Kyushu University, 6-10-1 Hakozaki, Higashiku, Fukuoka 812-8581, Japan.
J Colloid Interface Sci. 2006 Mar 1;295(1):209-17. doi: 10.1016/j.jcis.2005.08.002. Epub 2005 Aug 22.
The adsorption behavior and the phase transition of alkanol and fluoroalkanol at the electrified mercury/aqueous solution interface were investigated by the interfacial tension measurements and the thermodynamic analysis. In the alkanol system, it is found that the phase transitions in low interfacial densities occur: the ones from the zero adsorption to the gaseous or the expanded state and the gaseous to the expanded state at the electrified interface depending on the electrostatic nature as well as the concentration in the bulk phase. These phase transitions were verified by the thermodynamic equations derived by the assumption of coexistence of two phases at the electrified interface. Furthermore the distribution of ionic species in the interfacial region is discussed on the basis of dependence of the interfacial charge density of solution phase on an applied potential. Fluoroalkanol, on the other hand, was practically not adsorbed at the electrified interface within this experimental condition. The zero adsorption of fluoroalkanol molecules suggests the driving force of the adsorption may be the interaction hydrophobic group of alcohol molecule and mercury.
通过界面张力测量和热力学分析，研究了链烷醇和氟代链烷醇在带电汞/水溶液界面的吸附行为和相变。在链烷醇体系中，发现在低界面密度下会发生相变：在带电界面处，根据静电性质以及本体相中的浓度，会发生从零吸附到气态或膨胀态以及从气态到膨胀态的相变。这些相变通过在带电界面处假设两相共存推导得到的热力学方程得到了验证。此外，基于溶液相的界面电荷密度对施加电势的依赖性，讨论了界面区域中离子物种的分布。另一方面，在该实验条件下，氟代链烷醇实际上未吸附在带电界面上。氟代链烷醇分子的零吸附表明吸附的驱动力可能是醇分子的疏水基团与汞之间的相互作用。
