Viscoelastic interfaces comprising of cellulose nanocrystals and lauroyl ethyl arginate for enhanced foam stability

Czakaj, Agnieszka; Kannan, Aadithya; Wiśniewska, Agnieszka; Grześ, Gabriela; Krzan, Marcel; Warszyński, Piotr; Fuller, Gerald G.

doi:10.1039/c9sm02392e

Cited by 17 publications

(35 citation statements)

References 52 publications

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“…Bai et al used Mirenat-G containing 10.5% LAE in glycerol, measured the surface tension isotherm and established the CMC value at 0.1%wt (2.4 mM), and the σ CMC around 26 mN/m [ 13 ]. In our recent work, we determined the surface tension isotherm of LAE surfactant (commercial name Mirenat-P/100) with about 90% surfactant content and obtained similar results [ 12 ]. Other authors presented CMC and σ CMC values without reporting the isotherms.…”

Section: Introductionmentioning

confidence: 84%

“…Strong binding of LAE to the surface of negatively charged nanoparticles can be used to modify their surface properties for particular applications. For example, ethyl lauroyl arginate was used to modify the cellulose nanocrystals (CNC) for the improvement of foamability and foam stability [ 12 ] or stability of emulsions [ 13 ]. Three types of LAE-CNC interactions were recognised: the electrostatic attraction at low surfactant concentrations, followed by the hydrophobic interaction, and polymer-induced micellisation [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

et al. 2021

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“…Foaming experiments carried out with the double syringe for a commercial brand of LAE (85% purity) showed that at concentrations below 0.35 mM, its solution did not form foams surviving more than several minutes. On the contrary, when mixed with hydrophilic sulfated cellulose nanocrystals, foams could be stable for up to 4 h [21]. Nanometric sCNC with sulfate hydrophilic groups moderately interact with LAE at low surfactant concentrations, and particle zeta potential and hydrodynamic diameter do not change significantly.…”

Section: Of 13mentioning

confidence: 96%

“…Foaming experiments were carried out with the double syringe technique [19][20][21]with two single-use medical syringes of 60 mL volume connected by a narrow tube. First, 20 mL of LAE-CNC solution and 40 mL of air were mixed, and the solution passed from one syringe to the other ten times.…”

Section: Foamingmentioning

confidence: 99%

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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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Emergent hybrid mesophases in ternary mixtures of cellulose nanocrystals ‐ Pluronic micelles‐water

Cohen

Attia

Levi‐Kalisman

et al. 2022

Polymers for Advanced Techs

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Mixtures of nanometric rods and spherical micelles that are dominated by excluded volume (entropic) interactions tend to de-mix into sphere-and rod-rich mesophases.Here we report the observation of hybrid mesophases formed by mixtures of polymer-decorated sulfuric-acid-hydrolyzed cellulose nanocrystals (CNCs, rod-like particles), at high CNCs concentrations (7 wt%) where the native CNCs suspensions are at the bi-phasic (isotropic-chiral nematic) regime, and spherical micelles of the triblock-copolymers Pluronic F127 (and F108) in aqueous suspension. The polymers adsorb onto the CNCs particles, and at F127 concentrations above (10-18 wt%) the macroscopic phases of the hybrid mixture are transformed into mesoscopic droplets with a nanostructure that differs from that of the CNCs or the native Pluronics, as indicated by small-angle X-ray scattering. The observed phases preserve the chiral nematic nature of the CNCs phases with a shortened pitch, suggesting that coassembly of CNCs and self-assembling polymers may be used for engineering of emergent phases with emergent structures and properties.

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Viscoelastic interfaces comprising of cellulose nanocrystals and lauroyl ethyl arginate for enhanced foam stability

Abstract: At submillimolar concentrations of lauroyl ethyl arginate, cellulose nanocrystals aggregate and form elongated fibres. This interfacial assembly efficiently stabilises foams.

Cited by 17 publications

References 52 publications

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

Ethyl Lauroyl Arginate, an Inherently Multicomponent Surfactant System

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

Emergent hybrid mesophases in ternary mixtures of cellulose nanocrystals ‐ Pluronic micelles‐water

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