Studies on the formation and stability of perfluorodecalin nanoemulsions by ultrasound emulsification using novel surfactant systems

Syed, Usman Taqui; Dias, Ana M.A.; Crespo, João G.; Brazinha, Carla; Sousa, Hermínio C. de

doi:10.1016/j.colsurfa.2021.126315

Cited by 8 publications

(5 citation statements)

References 63 publications

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“…On the addition of sur factant (2% (w/w) Tween 80) to the corn oil (the continuous phase), the interfacial tension reduced significantly, showing an interfacial tension value of 0.58 ± 0.01 mN.m −1 . The re duction of the interfacial tension by emulsifiers can be attributed to the quick adsorption of the emulsifier onto the interface of immiscible liquids to promote their interaction [19,20]. There was a further reduction in the interfacial tension value to 0.11 ± 0.01 mN.m − between the dispersed phase and the continuous phase where the dispersed phase con sisted of water and 5% PEG 300.…”

Section: Interfacial Tension Studies Of the Two Phasesmentioning

confidence: 99%

“…While high-energy methods include those methods which use mechanical devices that are highly energy intensive, such as ultrasonicators, microfluidisers and high-pressure homogenisers, low-energy methods are those which form emulsions as a result of structural changes and processing conditions at the interfaces, such as by spontaneous emulsification, bubble bursting and phase inversion temperature methods [19]. Among the high-energy methods, ultrasound-assisted emulsification is preferred, as it comparatively consumes lower energy with a reduced risk of contamination by the experimental unit [20]. However, a technique that has garnered interest in recent years in the field of emulsification is membrane emulsification, a low-energy method performed at low shear stress and mild operating conditions [19].…”

Section: Introductionmentioning

confidence: 99%

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Design of Enzyme Loaded W/O Emulsions by Direct Membrane Emulsification for CO2 Capture

et al. 2022

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Membrane-based gas separation is a promising unit operation in a low-carbon economy due to its simplicity, ease of operation, reduced energy consumption and portability. A methodology is proposed to immobilise enzymes in stable water-in-oil (W/O) emulsions produced by direct membrane emulsification systems and thereafter impregnated them in the pores of a membrane producing emulsion-based supported liquid membranes. The selected case-study was for biogas (CO2 and CH4) purification. Upon initial CO2 sorption studies, corn oil was chosen as a low-cost and non-toxic bulk phase (oil phase). The emulsions were prepared with Nadir® UP150 P flat-sheet polymeric membranes. The optimised emulsions consisted of 2% Tween 80 (w/w) in corn oil as the continuous phase and 0.5 g.L−1 carbonic anhydrase enzyme with 5% PEG 300 (w/w) in aqueous solution as the dispersed phase. These emulsions were impregnated onto a porous hydrophobic PVDF membrane to prepare a supported liquid membrane for gas separation. Lastly, gas permeability studies indicated that the permeability of CO2 increased by ~15% and that of CH4 decreased by ~60% when compared to the membrane without carbonic anhydrase. Thus, a proof-of-concept for enhancement of CO2 capture using emulsion-based supported liquid membrane was established.

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Section: Interfacial Tension Studies Of the Two Phasesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Enzyme Loaded W/O Emulsions by Direct Membrane Emulsification for CO2 Capture

et al. 2022

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“…Nanoemulsion is a uniform and kinetically stable dispersion, typically with drop sizes of 20–200 nm, and it has become a popular carrier in recent years due to its novel properties including higher solubility to insoluble drugs, slower release, as well as better transdermal absorption ability, etc. − Generally, nanoemulsion can be prepared by low-energy emulsification methods and high-energy emulsification methods . High-energy emulsification methods, such as high-pressure homogenization, microfluidization, and ultrasonication, are widely used because the size of the droplets can be controlled easily and the amount of surfactant required for forming nanoemulsion is smaller . With the development of nanoemulsification technology, the nanoemulsion has been widely used in many fields including pharmaceuticals, cosmetics, food, materials, etc.…”

Section: Introductionmentioning

confidence: 99%

“…15−17 Generally, nanoemulsion can be prepared by low-energy emulsification methods 18 and high-energy emulsification methods. 19 High-energy emulsification methods, such as high-pressure homogenization, 20 microfluidization, 21 and ultrasonication, 19 are widely used because the size of the droplets can be controlled easily and the amount of surfactant required for forming nanoemulsion is smaller. 22 With the development of nanoemulsification technology, the nanoemulsion has been widely used in many fields including pharmaceuticals, cosmetics, food, materials, etc.…”

Section: ■ Introductionmentioning

confidence: 99%

Construction and Properties of O/W Liquid Crystal Nanoemulsion

Wu,

Ye,

Zhou

et al. 2024

Langmuir

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Liquid crystal emulsion is a new type of emulsion, in which the emulsifier molecules are located at the oil/water (O/ W) interface and form a long-range ordered and short-range disordered lamellar liquid crystal. The lamellar liquid crystal formed by the emulsifier is similar to the skin stratum corneum lipid structure, which enables it to have a broad application prospect in the fields of cosmetics, pharmaceuticals, etc. In this work, a liquid crystal nanoemulsion was obtained by passing a liquid crystal emulsion stabilized by hydrogenated lecithin and phytosterol combination through a microfluidizer. The microstructure of the prepared liquid crystal nanoemulsion was investigated experimentally by dynamic light scattering, transmission electron microscopy, and small-angle X-ray scattering. The results have shown that the nanoemulsion inherited the liquid crystal emulsion property, namely, the long-range ordered and shortrange disordered lamellar structure still existed at the oil/water interface even though they underwent extrusion, friction, and acceleration. At the same time, the underlying mechanisms of the existence of lamellar liquid crystal between the oil phase and the water phase for the nanoemulsion were explored theoretically by molecular dynamics simulations. The simulation results elucidated that the hydrogenated lecithin and phytosterol combination improved the flexibility of the bilayer structure composed of emulsifiers. The bilayers were the basic structure units of lamellar liquid crystals, and thus, the improved flexibility of bilayers provided insurance for the existence of lamellar liquid crystals with larger curvature around the oil droplets. In addition, the applicable properties of liquid crystal nanoemulsion were studied, and the results have shown that the liquid crystal nanoemulsion presented better slowrelease and moisturizing properties than traditional nanoemulsions due to the existence of multilayers between oil and water phases. This work not only provides necessary information for the development and effective application of liquid crystal emulsions but also is helpful for in-depth understanding the inner properties of lamellar liquid crystal at molecular level.

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“…Recent studies by Syed et al demonstrated the efficiency of the process in producing smaller and stable emulsions along with enhanced energy savings of the membrane emulsification technique over the conventional ultrasound emulsification technique. Comparative studies evaluated the energy density to emulsions, whereby membrane-based process ensures a 99.5% reduction in energy expenditure to produce the same surface area by sonicators [ 18 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Membrane Emulsification—A Novel Solution for Treatment and Reuse of Produced Water from Oil Field

et al. 2022

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Produced water (PW) is, by volume, the largest waste product of the oil- and gas-exploration industry and contains pollutants such as hydrocarbons and heavy metals. To meet the stringent environmental regulations, PW must be treated before discharging into the environment. The current study proposes a novel treatment method where PW is used to prepare oil-in-water emulsion with potential applications within the oil-exploration industry. The emulsions are prepared by applying hollow fiber membrane emulsification (ME) on PW, which inherently contains oil, as to-be-dispersed phase. The results demonstrate that the average droplet size of the emulsions is a function of pressure applied on to-be-dispersed phase and could be customized from 0.24 to 0.65 µm by varying the pressure from 0.25 to 1 bar, respectively. Stability of the emulsions was verified under high pressure and a temperature and storage period of more than 24 h. The calculations showed that an ME unit with <100 kg weight and <1 m3 volume is appropriate to transform the daily average volume of PW from the Danish part of the North Sea into the emulsions. The study provides a novel route, which also complies well with the requirements (low-weight and small spatial footprints) of the offshore oil rigs, to treat and reuse PW within the oil production process and, therefore, eliminates its environmental footprint.

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Studies on the formation and stability of perfluorodecalin nanoemulsions by ultrasound emulsification using novel surfactant systems

Cited by 8 publications

References 63 publications

Design of Enzyme Loaded W/O Emulsions by Direct Membrane Emulsification for CO2 Capture

Design of Enzyme Loaded W/O Emulsions by Direct Membrane Emulsification for CO2 Capture

Construction and Properties of O/W Liquid Crystal Nanoemulsion

Membrane Emulsification—A Novel Solution for Treatment and Reuse of Produced Water from Oil Field

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