磁场对阴离子和阳离子表面活性剂水溶液的影响。第一部分:水蒸发

E. Chibowski, A. Szcześ
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引用次数: 2

摘要

研究了静磁场(0.5 T)对阴离子十二烷基硫酸钠(SDS)和阳离子十二烷基三甲基溴化铵(DoTAB) 1 mM溶液中水分蒸发速率的影响。考虑到可能的实际应用效果,实验是有意在普通实验室环境中进行的,而不是在任何复杂的条件下进行的。在相同的环境下,同时进行了磁场处理和未处理样品中水分的蒸发。虽然经过MF处理和未处理的样品之间的水分蒸发量的定量差异随运行而变化,但定性MF效应始终是可重复的。因此,我们认为观测到的变化是显著的。结果发现,与未经MF处理的样品相比,MF影响了两种表面活性剂溶液中水分的蒸发速率,导致蒸发水量增加。在MF实验之前,首先研究了未经处理的表面活性剂溶液的水分蒸发速率。未经mf处理的阴离子表面活性剂溶液的水蒸发速度比纯水慢,而阳离子表面活性剂溶液的水蒸发速度比纯水快。考虑到表面活性剂的极性(离子)头的性质,即它们的大小,与水分子形成氢键的能力,以及水表面张力的降低,可以解释这种差异。MF处理导致两种表面活性剂的蒸发水量增加。然而,观察到阳离子DoTAB的效果更大。由于两种表面活性剂的碳氢化合物尾部是相同的(C12),因此所观察到的差异归因于它们离子头部的差异。用Gibbs吸附方程和梯度MF中的Lorentz力来解释这种差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetic Field Effects on Aqueous Anionic and Cationic Surfactant Solutions Part I: Water Evaporation
Static magnetic field (0.5 T) effects on water evaporation rate from anionic Sodium Dodecyl Sulfate (SDS) and cationic Dodecyl Trimethyl ammonium Bromide (DoTAB) 1 mM solutions were studied at room temperature and humidity for up to several hours. Keeping in mind possible practical application of the effects the experiments were intentionally carried out in a common laboratory environment and not in any sophisticated conditions. The evaporation of water from Magnetic Field (MF) treated and untreated samples were carried out simultaneously in the same environment. Although the quantitative differences in the evaporated amounts of water between MF treated and untreated samples changed from run to run, the qualitative MF effects were always reproducible. Therefore, it is believed that the observed changes are significant. It was found that the MF affects evaporation rate of water from solutions of both surfactants causing increase in the evaporated water amount in comparison to that of MF untreated sample. Prior to MF experiments first the water evaporation rate from the untreated surfactants solutions was studied. From the MF-untreated anionic surfactant solution water evaporated slower than from pure water, while from the cationic one water evaporated faster than from pure water. This difference was explained taking into account the properties of the polar (ionic) head of the surfactants, i.e. their size, ability to hydrogen bonding formation with water molecules, and the reduction of water surface tension. The MF treatment caused an increase in the evaporated water amount from both surfactants. However, a greater effect was observed for cationic DoTAB. Because the hydrocarbon tail in both surfactants is the same (C12) the observed differences were assigned to the differences in their ionic heads. Gibbs adsorption equation and Lorentz force in the gradient MF were applied to explain the differences.
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