High internal phase water/oil and oil/water gel emulsions formed using a glucose-based low-molecular-weight gelator

Ono, Fumiyasu; Shinkai, Seiji; Watanabe, Hisayuki

doi:10.1039/c7nj04508e

Cited by 9 publications

(13 citation statements)

References 20 publications

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“…The continuous phase is still water as determined by the drop dilution test; that is, one has O/W emulsions. In general, when the volume fraction of the dispersed phase is 74% or greater, the emulsion formed is termed as gel emulsions or high internal phase ratio emulsions. , Even for C w = 1 wt %, the emulsion is gel-like as long as the SDS concentration is high enough (0.52 M). Figure a,b demonstrates the decane-in-water and heptane-in-water gel emulsions formed by using 0.52 and 0.1 M anionic SDS surfactants for C w = 1 and 5 wt %, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In comparison to Figure c, the droplet shape is distorted from the spherical shape significantly, indicating densely packed droplets. Thus, the droplet motion is hindered because of a very small amount of the continuous phase. , The aforementioned stable O/W emulsions and gel emulsions were used to perform the oil–water separation experiments.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the droplet motion is hindered because of a very small amount of the continuous phase. 58,59 The aforementioned stable O/W emulsions and gel emulsions were used to perform the oil−water separation experiments.…”

Section: Characterization Of the Emulsion Typementioning

confidence: 99%

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Stress-Driven Separation of Surfactant-Stabilized Emulsions and Gel Emulsions by Superhydrophobic/Superoleophilic Meshes

et al. 2018

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Oil-in-water (O/W) emulsions and gel emulsions which are stabilized by surfactants for more than 5 months have been successfully separated by a simple gravity-driven agitation-assisted device. The device contains a rotating magnetic stir bar and a flexible superhydrophobic/superoleophilic Cu mesh which has been folded into the desired three-dimensional shape. The emulsions were prepared by mixing various fractions of alkane and water (99–1%) stabilized by a water-soluble surfactant. For low water fractions which contained higher concentrations of the surfactant, solid-like gel emulsions were obtained. The stress-driven process was found to effectively separate stable emulsions with a separation efficiency ≥ 98% and gel emulsions with a separation efficiency as high as 96%. The mechanism for oil recovery from stable emulsions by our stress-driven device is based on the momentary breakage of the water barrier layer (superhydrophobicity) and the enhancement of the oil–mesh contact leading to oil permeation (superoleophilicity). For gel emulsions, the additional function of the stress is to induce a temporary transformation from the solid-like gel into a liquid-like state. Our methodology can be employed for an efficient separation of highly stable O/W emulsions and gel emulsions that are often produced by industrial processes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Stress-Driven Separation of Surfactant-Stabilized Emulsions and Gel Emulsions by Superhydrophobic/Superoleophilic Meshes

et al. 2018

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“…The specific surface area of spherical porous poly (DVB-VBC) and immobilization with tris(2-aminoethyl)amine was obtained using the standard BET method. This rather low surface area suggested that the material possessed amount of mezo and micropores [34]. In the case of sample 5a (at a molar ratio of amine/chloromethyl groups 3/1) BET surface area was 8.26 m 2 g -1 .…”

Section: Potentiometric Measurementsmentioning

confidence: 94%

Preparation of PolyHIPE monolithic materials functionalization by tris(2-aminoethyl)amine

2021

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The developments of monolithic materials rapidly in nowadays hold an impressively strong position in separation science as well as in other areas of chemistry. In this research are presented functionalization of PolyHIPE monolithic materials by tris(2-aminoethyl) amine. Monolithic polymer supports and scavengers were synthesized via nucleophilic displacement of chlorine in poly(4-vinyl benzyl chloride-co-divinylbenzene) as PolyHIPE materials. Porous copolymers of DVB/DVB were prepared by emulsion templating using high internal phase emulsions (HIPEs) as precursors for monoliths. The properties of the final products synthesized were functionalized with an amino group, at a different ratio of amine/chloromethyl groups, in different time refluxed were explored. PolyHIPE functionalized with tris(2-aminoethyl)amine to yield a product with high degrees of conversion. The extent of the functionalization reactions was investigated by a range of qualitative and quantitative techniques: FTIR, CHN analysis, potentiometric measurements, and (BET) measurements have been performed.

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“…Recent work has shown that the stability of gel-in-gel W/O high internal phase emulsions (HIPEs) resulted from the combined presence of a highly-packed dispersed aqueous phase stabilized by carrageenan, glycerol monooleate at the oil-water interface, and a surrounding beeswax crystal network (Lee et al, 2019). Ono et al developed HIPEs that comprised silicone oil and water prepared with low concentrations of a glucose-based gelator that gelled both the dispersed and continuous phases, which resulted in HIPEs with tunable rigidity (Ono et al, 2018). Other work looked at the effect of xanthan gum in the aqueous phase of beeswax-stabilized W/Og systems, but no clear effect on overall properties was established (Öǧütcü et al, 2015).…”

Section: Structuring the Internal Water Phasementioning

confidence: 99%

Water-in-Oleogel Emulsions—From Structure Design to Functionality

Wijarnprecha

Vries

Sonwai

et al. 2021

Front. Sustain. Food Syst.

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The development of water-in-oleogel (W/Og) emulsions is highlighted, with focus placed on the key properties dictating the structuring ability of both the continuous oleogelled and dispersed phases present. The gelling ability of oleogelators is distinguished by the formation of crystalline structures, polymeric strands, or tubules. Once a dispersed aqueous phase is introduced, droplet stabilization may occur via oleogelator adsorption onto the surface of the dispersed droplets, the formation of a continuous gel network, or a combination of both. Surface-active species (added or endogenous) are also required for effective W/Og aqueous phase dispersion and stabilization. Processing conditions, namely temperature-time-shear regimes, are also discussed given their important role on dispersed droplet and oleogel network formation. The effects of many factors on W/Og emulsion formation, rheology, and stability remain virtually unknown, particularly the role of dispersed droplet size, gelation, and clustering as well as the applicability of the active filler concept to foods. This review explores some of these factors and briefly mentions possible applications of W/Og emulsions.

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High internal phase water/oil and oil/water gel emulsions formed using a glucose-based low-molecular-weight gelator

Abstract: High internal phase silicone-oil-containing water/oil and oil/water emulsions were prepared using low loadings of a glucose-based low-molecular-weight gelator.

Cited by 9 publications

References 20 publications

Stress-Driven Separation of Surfactant-Stabilized Emulsions and Gel Emulsions by Superhydrophobic/Superoleophilic Meshes

Stress-Driven Separation of Surfactant-Stabilized Emulsions and Gel Emulsions by Superhydrophobic/Superoleophilic Meshes

Preparation of PolyHIPE monolithic materials functionalization by tris(2-aminoethyl)amine

Water-in-Oleogel Emulsions—From Structure Design to Functionality

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