Tuning particle–particle interactions to control Pickering emulsions constituents separation

Sabri, Faezeh; Berthomier, Kevin; Wang, Changsheng; Fradette, Louis; Tavares, Jason Robert; Virgilio, Nick

doi:10.1039/c8gc03007c

Cited by 16 publications

(8 citation statements)

References 38 publications

(44 reference statements)

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“…Emulsions are colloid dispersions that are utilized in a wide range of industrial and medical applications, such as encapsulation and controlled release, − polymerization, , catalysis, − and material fabrication. − This versatility results from the fact that many features of emulsions can easily be manipulated, including their composition, particle size, surface area, interfacial properties, and rheology. The functional performance of many emulsion-based products is governed by the nature of the emulsifier used to coat the droplets.…”

Section: Introductionmentioning

confidence: 99%

One-Step Dynamic Imine Chemistry for Preparation of Chitosan-Stabilized Emulsions Using a Natural Aldehyde: Acid Trigger Mechanism and Regulation and Gastric Delivery

Chen

Zhao

et al. 2020

J. Agric. Food Chem.

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Chitosan is a polysaccharide widely used as a structuring agent in foods and other materials because of its positive charge (amino groups). At present, however, it is difficult to form and stabilize emulsions using chitosan due to its high hydrophilicity. In this study, oil-in-water emulsions were prepared using a one-pot green-chemistry method. The chitosan and aldehyde molecules were in situ interfacially conjugated during homogenization, which promoted the adsorption of chitosan onto the oil droplet surfaces where they created a protective coating. The universality of this method was verified by using chitosan with different molecular weights and four kinds of natural aldehydes [cinnamaldehyde (CA), citral (CT), citronella (CN), and vanillin (VL)]. Chitosan with higher molecular weight facilitated the formation of emulsions. By harnessing the dynamic covalent nature of imine bonds, chitosan emulsions with an imine link display dynamic behavior with acid-catalyzed hydrolysis. The aldehyde structure could control the pH point of trigger for breakdown of emulsions, which was 1.0, 3.0, 4.0, and 4.0 for CA emulsion, CT emulsion, CN emulsion, and VL emulsion, respectively. At pH 6.5, aldehyde helped to decrease the interfacial tension of chitosan to about 10 mN/m, while this value would increase if the pH decreased by adding acid during the measurement. Chemical kinetics studies indicated that the hydrophobicity and conjugation effect of the aldehyde together determined the trigger points and properties of the emulsion. Finally, we used the optimized emulsions to encapsulate and control the release of curcumin. The gastric release behavior of the curcumin depended on aldehyde structure: VL > CN > CT ≈ CA. Hence, a tailor-made trigger release emulsion system can be achieved by rational selection and design of aldehyde structure to control hydrophobicity and conjugation effect of aldehydes.

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Section: Introductionmentioning

confidence: 99%

One-Step Dynamic Imine Chemistry for Preparation of Chitosan-Stabilized Emulsions Using a Natural Aldehyde: Acid Trigger Mechanism and Regulation and Gastric Delivery

Chen

Zhao

et al. 2020

J. Agric. Food Chem.

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“…22 However, small emulsifiers are difficult to separate from the reaction mixtures. 23 Different from traditional emulsions, Pickering emulsions (PEs) stabilized by colloidal particles are more advantageous because the particulate stabilizers are recyclable by many techniques, 24 e.g., filtration 25 and centrifugation. 26 Moreover, PEs are more stable, economical, and eco-friendly, which makes them appealing for a wide range of synthetic reactions, 27,28 such as oxidation, 29,30 reduction, 31,32 hydrogenolysis, [33][34][35] and even cascade reactions.…”

Section: Introductionmentioning

confidence: 99%

Pickering interfacial catalysts for asymmetric organocatalysis

Sun

Juřica

Hübner

et al. 2022

Catal. Sci. Technol.

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“…Most of the stimuli-responsive molecules previously reported in the literature would depend on reversible interactions, including hydrogen bonds, ion pairs, coordinate bonds, etc. Such stimuli-responsive molecules based on chemical interaction generally require sophisticated design and tedious synthesis. ,− In addition, the application scenarios are often quite complicated in terms of the chemical composition of emulsions and processing conditions, such as water quality, oil composition, and geographical and biological environment, which means that selecting the appropriate trigger based on actual conditions is quite important. ,, It ultimately hinges on a balance between the investment costs and the economic benefit of stimuli-responsive molecules. Thus, reducing chemical consumption, improving sustainability, and simplifying processes are extremely rewarding to meet various demands in different applications.…”

Section: Introductionmentioning

confidence: 99%

Novel Strategy of Polymers in Combination with Silica Particles for Reversible Control of Oil–Water Interface

Sun

et al. 2022

ACS Appl. Mater. Interfaces

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Hybrid smart emulsification systems are highly applicable in manipulating oil-in-water (O/W) droplets. Herein, novel switchable block polymers containing both zwitterionic and tertiary amine pendent groups were designed and synthesized to combine with charged silica particles to stabilize the O/W emulsion responsive to pH. This study was carried out in O/W emulsions stabilized with the polymer and silica particles under different pH conditions. The emulsion system was also simulated using molecular dynamics simulation to reveal the mechanism at molecular levels, thus gaining insight into the relationships between the emulsifying properties and the molecular interaction of the mixed system. Upon acidification of the continuous aqueous phase, protonated polymers with excellent hydrophilicity were induced by charged silica particles to cause rapid emulsion coalescence. In alkaline media, the mixed system conversely stabilized the O/ W emulsions, cutting polymer consumption by over three-quarters. The emulsification and demulsification can be switched alternately by tuning the pH conditions. The applications exhibited excellent efficiency in separating heavy oil/water emulsions and proved the high conversion rate in emulsion polymerization. Overall, with this novel strategy to relieve tedious modifications on particle surfaces and massive consumption of polymers, the designed responsive emulsification systems can impart intelligent and controllable chemical reactivity to emulsions on demand in a more affordable and sustainable way.

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Tuning particle–particle interactions to control Pickering emulsions constituents separation

Abstract: This work demonstrates how grafting natural polysaccharides, herein sodium alginate, on a particle surface enhances the separation of Pickering emulsion constituents.

Cited by 16 publications

References 38 publications

One-Step Dynamic Imine Chemistry for Preparation of Chitosan-Stabilized Emulsions Using a Natural Aldehyde: Acid Trigger Mechanism and Regulation and Gastric Delivery

One-Step Dynamic Imine Chemistry for Preparation of Chitosan-Stabilized Emulsions Using a Natural Aldehyde: Acid Trigger Mechanism and Regulation and Gastric Delivery

Pickering interfacial catalysts for asymmetric organocatalysis

Novel Strategy of Polymers in Combination with Silica Particles for Reversible Control of Oil–Water Interface

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