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首页> 外文期刊>International Journal of Heat and Mass Transfer >Adsorption kinetics of the ionic surfactant decanoic acid
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Adsorption kinetics of the ionic surfactant decanoic acid

机译：离子型表面活性剂癸酸的吸附动力学

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摘要

The adsorption kinetics of ionic surfactant decanoic acid was examined. Dynamic and equilibrium surface tensions (ST) were measured using a video-enhanced pendant bubble tensiometer. The equilibrium ST data and the complete ST relaxation profiles were compared with theoretical profiles predicted by both non-ionic and ionic models. The quasi-equilibrium approach was used in the ionic model to describe the electric field in the electrical double layer. Both non-ionic and ionic generalized-Frumkin models predict the equilibrium and dynamic ST data very well. Using the ionic model, a comparison between the dynamic ST data and the theoretical ST profiles gave a diffusivity of 5.5 × 10~(-6) cm~2/s. The adsorption of decanoic acid onto the air-water interface was determined to be diffusion controlled. Dynamic surface properties (Γ and Ψ_s), the electrical potential Ψ(r, t) in the double layer, and the double layer thickness λ(C, t) were also evaluated. It was found that the surface charge density increases very quickly at the early stages (～1 s) of the surfactant adsorption process. Additionally, the electrical surface potential data implied that the surface charge density becomes significantly stronger at very dilute surfactant concentrations, where π is less than 1 mN/m.
机译：研究了离子型表面活性剂癸酸的吸附动力学。动态和平衡表面张力（ST）使用视频增强的悬垂气泡张力计测量。将平衡的ST数据和完整的ST弛豫曲线与非离子模型和离子模型预测的理论曲线进行比较。在离子模型中使用准平衡方法来描述双电层中的电场。非离子和离子广义Frumkin模型都很好地预测了平衡和动态ST数据。使用离子模型，动态ST数据和理论ST分布图之间的比较给出了5.5×10〜（-6）cm〜2 / s的扩散率。癸酸在空气-水界面上的吸附被确定为扩散受控的。还评价了动态表面性质（Γ和Ψs），双层中的电势Ψ（r，t）和双层厚度λ（C，t）。结果发现，在表面活性剂吸附过程的早期（〜1 s），表面电荷密度迅速增加。此外，表面电势数据表明，在非常稀的表面活性剂浓度（π小于1 mN / m）下，表面电荷密度变得明显更强。

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  • 作者

    Alvin Casandra; Ya-Chi Lin; Libero Liggieri; Francesca Ravera; Ruey-Yug Tsay; Shi-Yow Lin;

  • 作者单位

    Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Sec. 4, Taipei 106, Taiwan;

    Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Sec. 4, Taipei 106, Taiwan;

    CNR - Istituto per l'Energetica e le Interfasi IENI - UOS Genova, via De Marini, 6 Genova, Italy;

    CNR - Istituto per l'Energetica e le Interfasi IENI - UOS Genova, via De Marini, 6 Genova, Italy;

    Institute of Biomedical Engineering, National Yang-Ming University, 155 Li-Nung St., Sec. 2, Taipei 112, Taiwan;

    Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Sec. 4, Taipei 106, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Adsorption kinetics; Ionic surfactant; Dynamic surface tension; Diffusion coefficient; Decanoic acid;

    机译：吸附动力学;离子表面活性剂;动态表面张力;扩散系数癸酸;

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