Graduate School of Advanced Science and Engineering, Hiroshima University.
J Oleo Sci. 2024 Oct 1;73(10):1289-1294. doi: 10.5650/jos.ess24114. Epub 2024 Sep 20.
The adsorbed film of Sodium Hexadecyl Sulfate (SHS) at the dodecane - water interface showed a first-order phase transition to a surface frozen monolayer upon cooling by the lateral van der Waals attraction between their hydrophobic tails and those of hexadecanol (C16OH) incorporated from the dodecane phase. The surface freezing transition of the SHS - C16OH monolayer was then utilized to stabilize an oil-in-water (OW) emulsion. The obtained results were compared to those examined previously for the cetyltrimethylammonium chloride (CTAC) - C16OH surface frozen monolayer. The main conclusion of this study was that the interfacial density of SHS significantly increased at the surface freezing by the cooperative adsorption with C16OH which gave rise to a higher surface freezing temperature (35°C) compared to CTAC (25°C). The formation of the surface freezing monolayer in the ambient temperature range could have a significant importance when it is applied to practical applications.
十二烷-水界面上的十六烷基磺酸钠（SHS）吸附膜在冷却时通过疏水尾之间的侧向范德华吸引力向表面冷冻单层发生一级相变，这些疏水尾与来自十二烷相的十六烷醇（C16OH）结合。然后，利用 SHS-C16OH 单层的表面冷冻转变来稳定油包水（OW）乳液。所得结果与先前研究的十六烷基三甲基氯化铵（CTAC）-C16OH 表面冷冻单层进行了比较。本研究的主要结论是，SHS 通过与 C16OH 的协同吸附在表面冷冻时显著增加了界面密度，从而导致表面冷冻温度（35°C）高于 CTAC（25°C）。当应用于实际应用时，在环境温度范围内形成表面冷冻单层可能具有重要意义。
