Interfacial Properties and Emulsification of Biocompatible Liquid-Liquid Systems

Dziza, Katarzyna; Santini, Eva; Liggieri, Libero; Jarek, Ewelina; Krzan, Marcel; Fischer, Thilo C.; Ravera, Francesca

doi:10.3390/coatings10040397

Cited by 17 publications

(12 citation statements)

References 46 publications

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“…The surface activity of surfactant solutions can provide insight into their emulsifying and oil dispersing capabilities. For example, highly surface-active species will readily adsorb to an interface and reduce the interfacial tension (IFT) considerably, making them effective emulsifiers. ,, While zwitterionic surfactant DDAPS at a concentration of 0.05 mM lowers the IFT of hexadecane and water from ∼55 mN/m to 20.669 ± 1.021 mN/m (dashed horizontal line in Figure ), the presence of coadditives is expected to further reduce the IFT.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Kinetically stable oil droplets dispersed in water (i.e., nanoemulsions) can be created by ultrasonicating small amounts of oil into an aqueous solution of emulsifiers or surfactants. Nanoemulsions are generally ∼100s of nanometers in diameter, and the droplet distribution should have a polydispersity index <0.3 to be considered monodispersed and appropriate for applications. ,, Common surfactants such as SDS and DTAB are very effective emulsifiers and oil dispersants on their own. Interestingly, zwitterionic DDAPS alone (0.1–5 mM) does not form nanoemulsions.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Nanoemulsions are generally ∼100s of nanometers in diameter, and the droplet distribution should have a polydispersity index <0.3 to be considered monodispersed and appropriate for applications. 1,36,37 Common surfactants such as SDS and DTAB are very effective emulsifiers and oil dispersants on their own. Interestingly, zwitterionic DDAPS alone (0.1−5 mM) does not form nanoemulsions.…”

Section: Surface Activity Of Ddaps With Various Coadditivesmentioning

confidence: 99%

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Spectroscopic Studies of Zwitterionic DDAPS at Planar and Droplet Oil/Water Interfaces

et al. 2022

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Developing the knowledge on surfactant interfacial phenomena is highly valuable for the advancement of technological, commercial, and industrial products, as these applications often rely on interfacial and colloidal chemistry. Zwitterionic surfactants are a less toxic alternative to standard charged surfactants. With both positively charged quaternary ammonium and negatively charged sulfonate constituents, zwitterionic DDAPS can have diverse interfacial interactions with various coadditives. In this work, we investigate DDAPS adsorption to a planar oil/water interface and its stabilization of oil-in-water nanoemulsions. By studying both interfacial geometries with surface-specific, nonlinear spectroscopy, we gain deeper insights and a molecular perspective into DDAPS’s behavior in the presence of various salts and cosurfactants. From an application standpoint, zwitterionic surfactants are often mixed with other chemicals or used in an environment with pre-existing chemicals (e.g., ocean water during oil remediation). Thus, it is important to understand how such coadditives alter DDAPS’s behavior and its performance as an emulsifier. Our results show that DDAPS is nearly uninfluenced by coadditives at a planar oil/water interface, but the identical coadditives are crucial for DDAPS to form and stabilize nanoemulsions. Additionally, the surfactant packing properties vary between interfaces as well as coadditives, indicating that certain interactions with the DDAPS headgroup are stronger and play a greater role in tuning DDAPS’s interfacial behavior.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Surface Activity Of Ddaps With Various Coadditivesmentioning

confidence: 99%

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Spectroscopic Studies of Zwitterionic DDAPS at Planar and Droplet Oil/Water Interfaces

et al. 2022

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“…The energy used during the emulsification is lower if the interfacial tension and surface elasticity values are smaller. However, if the elasticity increases, the coalescence decreases. , Thus, there should be an optimum elasticity that does not require high energy to break the interfacial layer and, at the same time, prevents the drop coalescence. In this study, the optimum CNC-CTAB concentrations are dispersions that generate stable emulsions with low energy input emulsification methods.…”

Section: Resultsmentioning

confidence: 99%

Cellulose Nanocrystal Laden Oil–Water Interfaces: Interfacial Viscoelasticity, Emulsion Stability, and the Dynamics of Three-Phase Contact-Lines

Bazazi

Hejazi

2021

Ind. Eng. Chem. Res.

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We study the influence of cellulose nanocrystals on the oil−water interfacial viscoelasticity and consequently on the emulsification and the three-phase (oil−water−solid) contact-line movement. Cellulose nanocrystals (CNCs) are used in combination with hexadecyl trimethyl ammonium bromide (CTAB) as the source of nanoparticle-surfactant dispersion. We use two samples of oils (i) heptane (representing a low viscosity system) and (ii) mineral oil (representing a high viscosity system). The emulsification stability map is developed for the heptane-water systems at various CNC-CTAB concentrations. The map displays stable emulsion formations when dilatational interfacial viscoelasticity is above ∼ 40 mN/m. The coupled interfacial rheology and microscale characterization analysis show that CNCs become surface active by the adsorption of surfactants, migrate to the oil−water interface, and create a viscoelastic interface. The CNC-CTAB interfacial layer prevents the drop coalescence, creating highly stable medium internal phase emulsions. The emulsification experiments are further performed with a high viscosity mineral oil sample, where similar stability trends as heptane emulsions are obtained. Furthermore, it is shown that the CNC-CTAB-laden drops wet a hydrophilic solid surface, submerged in the mineral oil, with a wetting radius growing according to r ∼ t α . Similar to the spreading of the surfactant (CTAB-laden) drops, three regimes are identified, an initial retardation regime (α ≤ 0.5), a second earlytime viscous-dominated regime (α ∼ 1), and the late-time Tanner regime (α = 0.1). However, the CNC-CTAB viscoelastic interfacial layer increases the duration of the early-time spreading regime by one order of magnitude.

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“…Interfacial properties of liquid–vapor systems play an important role in a wide range of natural processes as well as industrial applications where liquid–vapor and liquid–liquid interfaces are of interest . Some examples of engineering applications in which interfacial tension (IFT) plays a key role include painting and cosmetics, emulsification, laundry detergents, separation scrubbers, and internal combustion engines . Interfacial tension also has an important function in the oil and gas industry since it affects capillary pressures, relative permeabilities, and residual saturations in underground reservoirs .…”

Section: Introductionmentioning

confidence: 99%

Liquid–Vapor Interfacial Tension in Alkane Mixtures: Improving Predictive Capabilities of Molecular Dynamics Simulations

2022

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The liquid−vapor interfacial properties of hydrocarbons and their mixtures are important factors in a wide range of industrial processes and applications. Determining these properties experimentally, however, is not only practically demanding, but many important properties, such as phase densities and compositions are not directly experimentally accessible, thus requiring the development of theoretical models. Molecular dynamics (MD) simulations, by contrast, are relatively straightforward even for the most complex of mixtures and directly provide all of the microscopic quantities for the studied systems. We have previously applied MD simulations to study the liquid−vapor equilibria of mixtures of hydrocarbons and CO 2 that are particularly relevant to hydrocarbon recovery from geologic formations. In this study, we explore in more detail the robustness of the simulation methods with respect to the choice of the model system parameters, investigate the accuracy of the simulations in determining the key quantities: system pressure and interfacial tension (IFT), and, finally, devise a simple correction for achieving a much closer agreement between the simulated and experimental quantities. We perform extensive MD simulations for three mixtures, propane/n-pentane, propane/n-hexane, and CO 2 /n-pentane, using model systems from 1000 up to 100 000 molecules, and different simulation box dimensions to test for the sensitivity to finite-size effects. The results show that changing the system size and box dimensions does not significantly impact the accuracy of the simulations. Subsequently, we examine the accuracy of the MD simulations in determining the pressure and IFT for two pure hydrocarbon systems, n-pentane and n-heptane. Finally, we propose a simple linear correction formula for the pressures and IFTs obtained from the MD simulations that closely reproduce the experimental values for single components and mixtures of hydrocarbons. Our results enable the MD simulations to provide more accurate and reliable predictions of the interfacial properties, thereby reducing the need for challenging laboratory experiments.

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Interfacial Properties and Emulsification of Biocompatible Liquid-Liquid Systems

Cited by 17 publications

References 46 publications

Spectroscopic Studies of Zwitterionic DDAPS at Planar and Droplet Oil/Water Interfaces

Spectroscopic Studies of Zwitterionic DDAPS at Planar and Droplet Oil/Water Interfaces

Cellulose Nanocrystal Laden Oil–Water Interfaces: Interfacial Viscoelasticity, Emulsion Stability, and the Dynamics of Three-Phase Contact-Lines

Liquid–Vapor Interfacial Tension in Alkane Mixtures: Improving Predictive Capabilities of Molecular Dynamics Simulations

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