Eco-friendly surfactant alkyl polyglycosides (APGs) have garnered ample interest in the literature. However, the adsorption kinetics of APGs at an air-water interface has not been studied to date. Consequently, this study aimed at investigating the adsorption kinetics of the APG n-decyl-β-D-maltopyranoside (β-C₁₀G₂) at a freshly created air-water interface. The dynamic and equilibrium surface tension (ST) of the aqueous β-C₁₀G₂ solutions were experimentally measured at varying concentrations using a pendant bubble tensiometer and the ST data were examined via theoretical simulations using the Langmuir and Frumkin models. The fitting results revealed that the Frumkin model (with K = −2.9) well-predicted the equilibrium ST data; signifying a considerable cohesive intermolecular force amidst the adsorbed β-C₁₀G₂ molecules. The theoretical mixed-controlled ST profiles (predicted by the Frumkin model) described the dynamic ST data reasonably well, but the adsorption rate constant increased significantly at increasing concentration. A comparison on the ST data of β-C₁₀G₂ and β-C₁₂G₂ (n-dodecyl-β-D-maltopyranoside) was also conducted and a relatively greater surface-activity and lower cmc of the latter alkyl glycoside was observed.

中文翻译：

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环保型表面活性剂正癸基-β-D-吡喃麦芽糖苷的吸附动力学研究

环保型表面活性剂烷基多糖苷（APG）引起了文献的广泛关注。然而，迄今为止，APGs 在空气-水界面的吸附动力学尚未得到研究。_{因此，本研究旨在研究 APG n-癸基-β-D-吡喃麦芽糖苷 (β-C 10} G ₂ ) 在新创建的空气-水界面上的吸附动力学。使用悬垂气泡张力计在不同浓度下实验测量β-C ₁₀ G ₂水溶液的动态和平衡表面张力(ST) ，并使用Langmuir 和Frumkin 模型通过理论模拟检查ST 数据。拟合结果表明 Frumkin 模型（K = −2.9) 良好预测的平衡 ST 数据；_{表明吸附的 β-C 10} G ₂分子中有相当大的分子间内聚力。理论混合控制 ST 曲线（由 Frumkin 模型预测）相当好地描述了动态 ST 数据，但吸附速率常数随着浓度的增加而显着增加。_{还对β-C 10} G ₂和β-C ₁₂ G ₂ (正十二烷基-β-D-吡喃麦芽糖苷)的ST数据进行了比较，发现后者的烷基糖苷具有相对较高的表面活性和较低的cmc。观察到的。