Abstract
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.
Original language | English |
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Pages (from-to) | 645-653 |
Number of pages | 9 |
Journal | Journal of Surfactants and Detergents |
Volume | 26 |
Issue number | 5 |
DOIs | |
State | Published - Sep 2023 |
Keywords
- adsorption kinetics
- alkyl polyglycoside
- dynamic surface tension
- eco-friendly surfactant
- mixed control
- β-CG