Interfacial Dynamic Properties and Dilational Rheology of Sulfonate Gemini Surfactant and its Mixtures with Quaternary Ammonium Bromides at the Air–Water Interface

Lai, Lu; Mei, Ping; Wang, Xiaomei; Cheng, Li; Zhao-hua, Ren; Liu, Yi

doi:10.1007/s11743-017-1954-8

Cited by 19 publications

(10 citation statements)

References 38 publications

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“…For low surfactant concentrations, the values of surface dilational modulus of LAE solutions were similar to those for DTAB [ 39 ]. However, for concentrations closer to CMC, they were much smaller, probably due to the neutralisation of the interfacial layer due to the presence of LAE-dodecanoate dimers.…”

Section: Resultsmentioning

confidence: 92%

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

et al. 2021

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Ethyl lauroyl arginate (LAE) is an amino acid-based cationic surfactant with low toxicity and antimicrobial activity. It is widely used as a food preservative and component for food packaging. When stored, LAE decomposes by hydrolysis into surface-active components Nα-lauroyl–l-arginine (LAS) or dodecanoic (lauric) acid. There are only a limited number of reports considering the mechanism of surface activity of LAE. Thus, we analysed the surface tension isotherm of LAE with analytical standard purity in relation to LAE after prolonged storage. We used quantum mechanical density functional theory (DFT) computations to determine the preferred hydrolysis path and discuss the possibility of forming highly surface-active heterodimers, LAE-dodecanoate anion, or LAE-LAS. Applying molecular dynamics simulations, we determined the stability of those dimers linked by electrostatic interactions and hydrogen bonds. We used the adsorption model of surfactant mixtures to successfully describe the experimental surface tension isotherms. The real part surface dilational modulus determined by the oscillation drop method follows a diffusional transport mechanism. However, the nonlinear response of the surface tension could be observed for LAE concentration close to and above Critical Micelle Concentration (CMC). Nonlinearity originates from the presence of micelles and the reorganisation of the interfacial layer.

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Section: Resultsmentioning

confidence: 92%

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

et al. 2021

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“…Patel et al () also examined the synergistic effect of cationic gemini surfactant (12‐5‐12) and SDES mixtures. Moreover, our groups investigated the interfacial dynamic properties and dilational rheology of surfactant mixtures of sulfonate gemini surfactant (carboxylate gemini surfactant [CGS12]) with bisquaternary ammonium dibromides (BQAS12 and BQAS16) and conventional single‐chain surfactants (DTAB, CTAB) at the air−water interface using the drop shape analysis (Lai et al, , ).…”

Section: Introductionmentioning

confidence: 99%

Equilibrium and Dynamic Surface Properties of Cationic/Anionic Surfactant Mixtures Based on Carboxylate Gemini Surfactant

Lai

Mei

et al. 2018

J Surfact & Detergents

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The equilibrium and dynamic surface properties of cationic/anionic surfactant mixtures of carboxylate gemini surfactant (CGS12) and quaternary ammonium salts with different alkyl chain lengths were investigated, and the synergistic properties and solubilization capacity toward phenanthrene of these mixtures were evaluated. Results show that all cationic/anionic surfactant mixtures exhibit negative interaction parameters, indicating the strong synergistic effects in the reduction of surface tension and the formation of micelles. When the mixing ratio is 1:1, the surface tension reaches the minimum value. Moreover, as the alkyl chain length increases, the interaction parameters become more negative. In addition, the thermodynamic parameters suggest that the formation of mixed micelles is exothermic with a positive change in entropy. The tendency of dynamic surface tension curves of these mixtures is similar to that of pure CGS12. At the same concentration, these mixtures exhibit a higher adsorption rate than pure surfactants, and a lower adsorption potential barrier than cationic surfactants. However, for the CGS12/stearyltrimethylammonium bromide mixture, the drop rate constant of surface tension is lower than that of either component. Compared with the pure surfactant solutions, the cationic/anionic surfactant mixtures exhibit higher solubilization capacity toward phenanthrene. As the length of the alkyl chain increases, the solubilization capacity of the mixed cationic/anionic surfactant increases.

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“…This contrasts with publications in which one may identify modulus synergism in binary surfactant systems. In those studies, dilatational moduli synergism could only be identified for either a fixed total concentration ,− or a fixed tension condition, but not both. Modulus synergism may be observed in either the storage modulus, the loss modulus, or perhaps both moduli.…”

Section: Resultsmentioning

confidence: 96%

“…It is of interest to establish a connection between interfacial tension synergism and the conditions that may yield synergistic increases in the magnitudes of the interfacial dilatational moduli. The literature pertaining to interfacial dilatational rheology in surfactant mixtures is limited and thus far is restricted to systems where all the surfactants were dissolved in a single fluid phase. ,− …”

Section: Introductionmentioning

confidence: 99%

pH-Dependent Interfacial Tension and Dilatational Modulus Synergism of Oil-Soluble Fatty Acid and Water-Soluble Cationic Surfactants at the Oil/Water Interface

et al. 2021

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While the concept of interfacial tension synergism in surfactant mixtures is well established, little attention has been paid to the possibility of synergistic effects on the interfacial rheology of mixed surfactant systems. Furthermore, interfacial tension synergism is most often investigated for mixtures of surfactants residing in a single phase. Here, we define dilatational modulus synergism and report a study of interfacial tension isotherms and complex dilatational moduli for a binary surfactant system with the two surfactants accessing the oil/water interface from opposite sides. Using an oil-soluble fatty acid surfactant (palmitic acid, PA) that may be ionized at the oil/water interface and a quaternary ammonium water-soluble cationic surfactant (tetradecyltrimethylammonium bromide, TTAB), the binary interfacial interaction was tuned by the aqueous phase pH. Interfacial tensions and dilatational moduli were measured by the pendant drop method for the binary surfactant system as well as the corresponding single-surfactant systems to identify synergistic effects. The possible occurrence of dilatational modulus synergism was probed from two perspectives: one for a fixed total surfactant concentration and the other for a fixed interfacial tension. The aqueous pH was found to have a controlling effect on both interfacial tension synergism and the dilatational modulus synergism. The conditions for interfacial tension synergism coincided with those for the storage modulus synergism: both tension and storage modulus synergisms were observed under all conditions tested at pH 7 where PA was mostly deprotonated, for both perspectives examined, but not for any conditions tested at pH 3 where PA is mostly protonated. The loss modulus synergism exhibited more complex behaviors, such as frequency and interfacial tension dependences, but again was only observed at pH 7. The tension and modulus synergism at pH 7 were attributed to the increased attraction between ionized PA and cationic TTAB and the formation of catanionic complexes at the oil/water interface.

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Interfacial Dynamic Properties and Dilational Rheology of Sulfonate Gemini Surfactant and its Mixtures with Quaternary Ammonium Bromides at the Air–Water Interface

Cited by 19 publications

References 38 publications

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

Equilibrium and Dynamic Surface Properties of Cationic/Anionic Surfactant Mixtures Based on Carboxylate Gemini Surfactant

pH-Dependent Interfacial Tension and Dilatational Modulus Synergism of Oil-Soluble Fatty Acid and Water-Soluble Cationic Surfactants at the Oil/Water Interface

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