Adsorption and thermodynamic properties of dissymmetric gemini imidazolium surfactants with different spacer length. Issue 2 (1st February 2017)

• Record Type: Journal Article
• Authors: Zhao, Xiaohui; An, Dong; Ye, Zhiwen
• Is Part Of: Journal of dispersion science and technology. Volume 38:Issue 2(2017)
• Page Start: 296
• Page End: 302
• Publication Date: 2017-02-01
• Subjects: Gemini imidazolium surfactants -- surface activity -- thermodynamic parameters -- the dissymmetry -- the spacer length; Emulsions -- Periodicals; Suspensions (Chemistry) -- Periodicals; Emulsions; Suspensions; 541.34
• DOI: 10.1080/01932691.2016.1163721
• Languages: English
• ISSNs: 0193-2691

Abstract

ABSTRACT: A series of dissymmetric gemini imidazolium surfactants with different spacer length ([C m C s C n im]Br2, m + n = 24, m = 12, 14, 16, 18; s = 2, 4, 6) were synthesized and characterized by 1 H NMR and ESI-MS spectroscopy. Their adsorption and thermodynamic properties were investigated by the surface tension and electrical conductivity methods. Consequently, the surface activity parameters (cmc, γcmc, π cmc, p C 20, cmc/ C 20, Γ max, A min ) and thermodynamic parameters (Δ G m θ, Δ H m θ, Δ S m θ ) were obtained. The effects of the dissymmetry ( m / n ) and the spacer length ( s ) on the surface activity and micellization process of surfactants have been discussed in detail. GRAPHICAL ABSTRACT: