Salt effects on the dilational viscoelasticity of surfactant adsorption layers

Firouzi, Mahshid; Kovalchuk, V. I.; Loglio, G.; Miller, R.

doi:10.1016/j.cocis.2021.101538

Cited by 33 publications

(24 citation statements)

References 68 publications

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“…Figure 7). The origin of that effect is unclear, but it demonstrates that both counterions and coions can affect the dilatational moduli at liquid interfaces with ionic surfactants [45]. Specific ion effects relevant for foaming were described in the literature [46].…”

Section: Surface Tensionmentioning

confidence: 99%

The Effect of Electrolytes and Urea on the Ethyl Lauroyl Arginate and Cellulose Nanocrystals Foam Stability

Czakaj¹,

Krzan²,

Warszyński³

2022

Applied Sciences

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Carboxylated cellulose nanocrystals (cCNC) are highly dispersible particles useful in many industries. In particular, they can be applied to form Pickering emulsions and foams for “green” applications in the cosmetics, pharmaceutical industry or food processing. We demonstrated that carboxylated cellulose nanocrystals enhance foamability and foam stability when mixed with cationic surfactant ethyl lauroyl arginate (LAE), having superior properties over sulfated cellulose nanocrystals (sCNC) concerning surfactant concentration range and foam volume. Mixtures of LAE and cCNC were characterized for their hydrodynamic diameter, zeta potential, surface tension and surface rheological properties. The influence of electrolytes, namely, sodium chloride, guanidine hydrochloride and sodium salicylate, and the addition of concentrated urea to LAE-cCNC mixtures on foamability and foam stability were investigated. Electrolytes in the concentration of 5 mM showed a moderate effect on foam stability. In contrast, spectacular foam collapse was detected after adding concentrated urea. The preliminary rheological data from the pendant drop oscillations revealed low elastic modulus upon urea addition and the loss modulus that increased with the frequency, which suggested a viscous interfacial layer.

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Section: Surface Tensionmentioning

confidence: 99%

The Effect of Electrolytes and Urea on the Ethyl Lauroyl Arginate and Cellulose Nanocrystals Foam Stability

Czakaj¹,

Krzan²,

Warszyński³

2022

Applied Sciences

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“…Surface properties are imposed by the composition and structure of surfaceactive compounds at the interface and the inherent relaxation processes. Surface dilational rheology, demonstrating the dynamic surface response to variations in the surface area, while the shape is conserved, has been recognised as a powerful technique for investigating the dynamic surface behaviour of systems such as surfactant-adsorbed layers, the building block of foams, froths and emulsions [16].…”

Section: Introductionmentioning

confidence: 99%

“…The dilatational interfacial rheology is conducted by altering the interfacial area and measuring the interfacial response to the change in the area [16,22]. The dynamic variation in interfacial tension is a consequence of relaxation processes within the adsorption layer, which are comprised of two main processes: (i) exchange of surfactant molecules between the adsorption layer and bulk solution, (ii) rearrangements of the molecules at the interface, changes of the orientation or conformation of the molecules and their aggregation.…”

Section: Introductionmentioning

confidence: 99%

“…All of the abovementioned studies on the effect of salts on surface viscoelasticity of surfactant-adsorbed layers are limited to a specific surfactant or salt concentration. As demonstrated in our recent work [16,31], a wide range of surfactant and salt concentrations need to be considered for provision of a clear image of the role of salts in surfactant solutions. In our previous work [31], we illustrated that adding NaCl (0.01-0.3 M) to the sodium dodecylbenzene sulfonate (SDBS) solutions can both increase and decrease the viscoelasticity depending on the surfactant and salt concentration.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we aim to elaborate on the effect of adding different types and concentrations of salts on the surface properties of SDBS surfactant solutions at a wide range of surfactant concentrations. To the best of our knowledge, there is no such study showing the salt effect on the surface rheology of ionic surfactants [16]. Here, the effect of adding 0.001-0.1 M monovalent and divalent salts including NaCl, KCl, LiCl, CaCl 2 , and MgCl 2 on the surface dilational rheology of anionic SDBS solutions is investigated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Divalent and Monovalent Salts on Interfacial Dilational Rheology of Sodium Dodecylbenzene Sulfonate Solutions

Amani

Firouzi

2022

Colloids and Interfaces

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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.

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Interfacial properties of cationic and anionic Gemini surfactant mixtures

Zhang

et al. 2022

J Surfact & Detergents

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The possibility and the prospect of cationic/anionic (“catanionic”) surfactant mixtures based on sulfonate Gemini surfactant (SGS) and bisquaternary ammonium salt (BQAS) in the field of enhanced oil recovery was investigated. The critical micelle concentration (CMC) of SGS/BQAS surfactant mixtures was 5.0 × 10−6 mol/L, 1–2 orders of magnitude lower than neat BQAS or SGS. A solution of either neat SGS or BQAS, could not reach an ultra‐low interfacial tension (IFT); but 1:1 mol/mol mixtures of SGS/BQAS reduced the IFT to 1.0 × 10−3 mN/m at 100 mg/L. For the studied surfactant concentrations, all mixtures exhibited the lowest IFT when the molar fraction of SGS among the surfactant equaled 0.5, indicating optimal conditions for interfacial activity. The IFT between the 1:1 mol/mol SGS/BQAS mixtures and crude oil decreased and then increased with the NaCl and CaCl2 concentrations. When the total surfactant concentration was above 50 mg/L, the IFT of SGS/BQAS mixtures was below 0.01 mN/m at the studied NaCl concentrations. Adding inorganic salt reduced the charges of hydrophilic head groups, thereby making the interfacial arrangement more compact. At the NaCl concentration was above 40,000 mg/L, surfactant molecules moved from the liquid–liquid interface to the oil phase, thus resulting in low interfacial activity. In addition, inorganic salts decreased the attractive interactions of the SGS/BQAS micelles that form in water, decreasing the apparent hydrodynamic radius (DH, app) of surfactant aggregates. When the total concentration of surfactants was above 50 mg/L, the IFT between the SGS/BQAS mixtures and crude oil decreased first and then increased with time. At different surfactant concentrations, the IFT of the SGS/BQAS mixtures attained the lowest values at different times. A high surfactant concentration helped surfactant molecules diffuse from the water phase to the interfacial layer, rapidly reducing the IFT. In conclusion, the cationic‐anionic Gemini surfactant mixtures exhibit superior interfacial activity, which may promote the application of Gemini surfactant.

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Salt effects on the dilational viscoelasticity of surfactant adsorption layers

Cited by 33 publications

References 68 publications

The Effect of Electrolytes and Urea on the Ethyl Lauroyl Arginate and Cellulose Nanocrystals Foam Stability

The Effect of Electrolytes and Urea on the Ethyl Lauroyl Arginate and Cellulose Nanocrystals Foam Stability

Effect of Divalent and Monovalent Salts on Interfacial Dilational Rheology of Sodium Dodecylbenzene Sulfonate Solutions

Interfacial properties of cationic and anionic Gemini surfactant mixtures

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