论文部分内容阅读
考察了多种表面活性剂溶液生成的二氧化碳水基泡沫的稳定性,发现十二烷基硫酸钠(SDS)稳定二氧化碳泡沫的效果比较突出。以SDS与脂肪醇聚氧乙烯醚硫酸钠(AES)体系对比,采用分子动力学模拟方法研究泡沫体系中二氧化碳分子的增溶、扩散等行为以及泡沫液膜中表面活性剂的界面排布规律,并采用FT-IR探测二氧化碳透过泡沫液膜的透过性。实验结果与模拟结果吻合,表明二氧化碳气体分子可增溶在泡沫液膜上表面活性剂疏水链间,并与水分子有相互作用,可渗透进入泡沫液膜,在泡沫液膜内增溶,因此二氧化碳分子透过液膜的扩散能力强,泡沫聚并破灭速度加快。SDS分子疏水链在泡沫液膜界面层内排列致密,液膜内二氧化碳增溶量小,二氧化碳分子透过SDS泡沫液膜的扩散速度较慢,因此泡沫稳定性好。
The stability of carbon dioxide water-based foams produced by various surfactant solutions was investigated. The effect of sodium dodecyl sulfate (SDS) on stabilizing carbon dioxide foam was prominent. SDS and fatty alcohol polyoxyethylene ether sulfate (AES) system comparison, the use of molecular dynamics simulation method of foam system carbon dioxide molecules solubilization and diffusion behavior and the foam liquid film in the surfactant interface arrangement, FT-IR was used to detect the permeability of carbon dioxide through the foam liquid film. The experimental results are consistent with the simulation results, indicating that carbon dioxide gas molecules can solubilize between the hydrophobic chains of the surfactant on the surface of the foam liquid membrane and interact with the water molecules to penetrate into the foam liquid membrane to solubilize in the foam liquid membrane. Carbon dioxide molecules through the liquid membrane diffusion ability, foam aggregation and speed up. The SDS hydrophobic chains are densely arranged in the foam liquid membrane interface layer, the solubilization of carbon dioxide in the liquid membrane is small, and the diffusion speed of carbon dioxide molecules through the SDS foam liquid membrane is relatively slow. Therefore, the foam stability is good.