Controlling Oil-in-Oil Pickering-Type Emulsions Using 2D Materials as Surfactant

Rodier, Bradley J.; Leon, Al de; Hemmingsen, Christina M.; Pentzer, Emily

doi:10.1021/acsmacrolett.7b00648

Cited by 50 publications

(64 citation statements)

References 53 publications

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“…Pentzer and co‐workers recently studied oil‐in‐oil emulsions stabilized by 2D graphene oxide (GO) particles . Through their coordination to both the edges and basal plane of graphene oxide, various primary alkyl amines can be chosen to establish which liquid will serve as the continuous phase of oil‐in‐oil emulsions (i.e., nonpolar‐in‐polar or polar‐in‐nonpolar).…”

Section: Simple All‐liquid Devicesmentioning

confidence: 99%

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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imparts novel mechanical and functional properties to the macroscopic interface itself. These properties include size-and charge-selective pathways for molecules and particulates, shear and compressive moduli, and selective binding and reaction sites. Complex interfaces can then be used to generate complex, macroscopic, all-liquid materials with very high surface areas that have unique properties, such as compartmentalization, communication between compartments, and the ability to move and reconfigure. With the rapid growth in the study of complex materials made from interfacially structured liquids, there is a need to review the field from the funda-Liquid-fluid interfaces provide a platform both for structuring liquids into complex shapes and assembling dimensionally confined, functional nanomaterials. Historically, attention in this area has focused on simple emulsions and foams, in which surface-active materials such as surfactants or colloids stabilize structures against coalescence and alter the mechanical properties of the interface. In recent decades, however, a growing body of work has begun to demonstrate the full potential of the assembly of nanomaterials at liquid-fluid interfaces to generate functionally advanced, biomimetic systems. Here, a broad overview is given, from fundamentals to applications, of the use of liquid-fluid interfaces to generate complex, all-liquid devices with a myriad of potential applications. Figure 2.Interactions between particles attached to liquid-fluid interfaces. a) Dipole-dipole interactions between adsorbed particles due to asymmetric charge distributions near the surface of particles at interfaces. Reproduced with permission. [34] Copyright 1980, American Physical Society. b) Dipole-dipole interactions give rise to 2D colloidal crystals with large lattice spacings. Scale bar, 50 µm. Reproduced with permission. [36]

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Section: Simple All‐liquid Devicesmentioning

confidence: 99%

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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“…Emulsions are mixtures of two immiscible liquids that consist of droplets of a discontinuous phase dispersed in a continuous phase. These are most commonly oil-inwater or water-in-oil and surfactants are used to lower the surface energy of the system and prevent droplet coalescence, 1,2 thereby overcoming kinetic and thermodynamic instability of the phase-separated systems. Examples of surfactants are amphiphilic small molecules, polymers, and particles (including spherical particles and nanosheets).…”

Section: Introductionmentioning

confidence: 99%

Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Gaur

Edgehouse

Klemm

et al. 2021

Journal of Polymer Science

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Many ionic liquids (ILs) have good solubilities of CO 2 but the high viscosity of ILs makes them cumbersome and kinetically limits gas uptake. Encapsulation of ILs is an effective approach to overcoming these limitations. In capsules with a core of IL, the chemical composition of the shell impacts performance.Here, we report the preparation of capsules with a core of the IL [Bmim][PF 6 ] and polymer composite shell, then evaluate how the identity of the polymer impacts CO 2 uptake. IL-in-oil Pickering emulsions stabilized by nanosheets are used, with capsules formed by interfacial polymerization between different diamines and diisocyanates (e.g., shells are polyurea and nanosheets). The capsules contain 60-80 wt% IL and the composition was verified using Fourier transform infrared spectroscopy. Optical microscopy, scanning electron microscopy, and particle sizing data showed spherical, discrete capsules with 50-125 μm in diameter. All capsules are stable up to 250 C. Brunauer-Emmett-Teller analysis of CO 2 gas uptake data showed that different polymer compositions led to different CO 2 uptake properties, with capacity ranging from 0.065 to 0.025 moles of CO 2 /kg sorbent at 760 torr and 20 C. This work demonstrates that the polymer identity of the shell impacts gas uptake properties and supports that shell composition can tailor performance.

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“…Diverse particles have been applied to achieve Pickering emulsions, including graphene oxide, 9 silica, 10 and modified starch, 11 among others. However, most of these particles are either synthetic or chemically modified, undermining classification as green products.…”

Section: Introductionmentioning

confidence: 99%

Formulation and Stabilization of Concentrated Edible Oil-in-Water Emulsions Based on Electrostatic Complexes of a Food-Grade Cationic Surfactant (Ethyl Lauroyl Arginate) and Cellulose Nanocrystals

et al. 2018

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We report on high-internal-phase, oil-in-water Pickering emulsions that are stable against coalescence during storage. Viscous, edible oil (sunflower) was emulsified by combining naturally derived cellulose nanocrystals (CNCs) and a food-grade, biobased cationic surfactant obtained from lauric acid and L-arginine (ethyl lauroyl arginate, LAE). The interactions between CNC and LAE were elucidated by isothermal titration calorimetry (ITC) and supplementary techniques. LAE adsorption on CNC surfaces and its effect on nanoparticle electrostatic stabilization, aggregation state, and emulsifying ability was studied and related to the properties of resultant oil-in-water emulsions. Pickering systems with tunable droplet diameter and stability against oil coalescence during long-term storage were controllably achieved depending on LAE loading. The underlying stabilization mechanism was found to depend on the type of complex formed, the LAE structures adsorbed on the cellulose nanoparticles (as unimer or as adsorbed admicelles), the presence of free LAE in the aqueous phase, and the equivalent alkane number of the oil phase (sunflower and dodecane oils were compared). The results extend the potential of CNC in the formulation of high-quality and edible Pickering emulsions. The functional properties imparted by LAE, a highly effective molecule against food pathogens and spoilage organisms, open new opportunities in food, cosmetics, and pharmaceutical applications, where the presence of CNC plays a critical role in achieving synergistic effects with LAE.

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Controlling Oil-in-Oil Pickering-Type Emulsions Using 2D Materials as Surfactant

Cited by 50 publications

References 53 publications

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Capsules with polyurea shells and ionic liquid cores for CO₂ capture

Formulation and Stabilization of Concentrated Edible Oil-in-Water Emulsions Based on Electrostatic Complexes of a Food-Grade Cationic Surfactant (Ethyl Lauroyl Arginate) and Cellulose Nanocrystals

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Controlling Oil-in-Oil Pickering-Type Emulsions Using 2D Materials as Surfactant

Cited by 50 publications

References 53 publications

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

Capsules with polyurea shells and ionic liquid cores for CO2 capture

Formulation and Stabilization of Concentrated Edible Oil-in-Water Emulsions Based on Electrostatic Complexes of a Food-Grade Cationic Surfactant (Ethyl Lauroyl Arginate) and Cellulose Nanocrystals

Contact Info

Product

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About

Capsules with polyurea shells and ionic liquid cores for CO₂ capture