- Title
- Effect of divalent and monovalent salts on interfacial dilational rheology of Sodium dodecylbenzene sulfonate solutions
- Creator
- Amani, Pouria; Firouzi, Mahshid
- Relation
- ARC.LP170100659 http://purl.org/au-research/grants/arc/LP170100659
- Relation
- Colloids and Interfaces Vol. 6, Issue 3, no. 41
- Publisher Link
- http://dx.doi.org/10.3390/colloids6030041
- Publisher
- MDPI AG
- Resource Type
- journal article
- Date
- 2022
- Description
- This study presents the equilibrium surface tension (ST), critical micelle concentration (CMC) and the dilational viscoelasticity of sodium dodecylbenzene sulfonate (SDBS)-adsorbed layers in the presence of NaCl, KCl, LiCl, CaCl2 and MgCl2 at 0.001–0.1 M salt concentration. The ST and surface dilational viscoelasticity were determined using bubble-shape analysis technique. To capture the complete profile of dilational viscoelastic properties of SDBS-adsorbed layers, experiments were conducted within a wide range of SDBS concentrations at a fixed oscillating frequency of 0.01 Hz. Salts were found to lower the ST and induce micellar formation at all concentrations. However, the addition of salts increased dilational viscoelastic modulus only at a certain range of SDBS concentration (below 0.01–0.02 mM SDBS). Above this concentration range, salts decreased dilational viscoelasticity due to the domination of the induced molecular exchange dampening the ST gradient. The dilational viscoelasticity of the salts of interest were in the order CaCl2 > MgCl2 > KCl > NaCl > LiCl. The charge density of ions was found as the corresponding factor for the higher impact of divalent ions compared to monovalent ions, while the impact of monovalent ions was assigned to the degree of matching in water affinities, and thereby the tendency for ion-pairing between SDBS head groups and monovalent ions.
- Subject
- dilational viscoelasticity; on-specific effect; matching in water affinities; ion valency; surface tension; surfactant solutions
- Identifier
- http://hdl.handle.net/1959.13/1443068
- Identifier
- uon:41875
- Identifier
- ISSN:2504-5377
- Rights
- © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
- Language
- eng
- Full Text
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