Effect of electrolytes on the interfacial rheological behaviors of N-cocoyl glycinate. Issue 5 (7th April 2022)

• Record Type: Journal Article
• Authors: Ullah, Sana; Zhang, Pingping; Wang, Yuzhao; Chen, Zhenghong; Wang, Ce; Liu, Changyao; Xu, Baocai
• Is Part Of: Journal of dispersion science and technology. Volume 43:Issue 5(2022)
• Page Start: 649
• Page End: 657
• Publication Date: 2022-04-07
• Subjects: Amino acid surfactant -- interface -- interfacial dilational rheology -- interfacial tension -- interfacial viscoelasticity; Emulsions -- Periodicals; Suspensions (Chemistry) -- Periodicals; Emulsions; Suspensions; 541.34
• DOI: 10.1080/01932691.2020.1844736
• Languages: English
• ISSNs: 0193-2691

Abstract

Abstract: Amino acid surfactants have been applied to numerous areas of science and are often used in the presence of electrolytes. In this study, the interfacial rheological behaviors of potassium N-cocoyl glycinate (KCGl), an amino acid surfactant, with three kinds of electrolytes (KCl, CaCl2 and tetrabutylammonium bromide (TBABr)) have been investigated using the oscillating drop method. The interfacial tensions (IFTs) and dilational rheological parameters show that KCGl in conjunction with electrolytes has enhanced interfacial activity and stronger intermolecular interaction than pure KCGl, indicating that electrolytes contribute to denser molecular packing at the oil–aqueous interface. Interestingly, the butyl groups of TBA + hinder closer arrangement of molecules at the interface, hindering KCGl ability to form a tightly packed layer compared with K + and Ca 2+ electrolytes. The relaxation processes, such as diffusion exchange of surfactant molecules between the aqueous phase and interface, are more probable to occur. Therefore, more viscoelastic films are formed in the presence of TBABr. Graphical Abstract: UF0001