On the adsorption kinetics of an eco-friendly surfactant n-decyl-β-D-maltopyranoside

Wen Chi Tseng, Siam Hussain, Ruey Yug Tsay, Shi Yow Lin*, Thu Thi Yen Le, Tran Van Nho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Pages (from-to)645-653
Number of pages9
JournalJournal of Surfactants and Detergents
Volume26
Issue number5
DOIs
StatePublished - Sep 2023

Keywords

  • adsorption kinetics
  • alkyl polyglycoside
  • dynamic surface tension
  • eco-friendly surfactant
  • mixed control
  • β-CG

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