Water in oil emulsions from hydrophobized metal membranes and characterization of dynamic interfacial tension in membrane emulsification

Silva, Pedro T. Santos; Morelli, Serena; Dragosavac, Marijana M.; Starov, Victor; Holdich, Richard

doi:10.1016/j.colsurfa.2017.06.051

Cited by 12 publications

(8 citation statements)

References 36 publications

(44 reference statements)

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“…Equation requires knowledge of the number of pores participating in the membrane emulsification process. It is well‐known that this is rarely the same number as the total number of pores present, as preferential flow through some pores occurs . For the validation work based on Equation , the number of active pores was modeled at 50 and 60%, values that appear reasonable based on recent work reported with this membrane type .…”

Section: Resultsmentioning

confidence: 99%

“…It is well‐known that this is rarely the same number as the total number of pores present, as preferential flow through some pores occurs . For the validation work based on Equation , the number of active pores was modeled at 50 and 60%, values that appear reasonable based on recent work reported with this membrane type . It is also logical that the number of pores participating in the emulsification increases with the injection flow rate, as the transmembrane pressure will increase.…”

Section: Resultsmentioning

confidence: 99%

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High throughput membrane emulsification using a single‐pass annular flow crossflow membrane

et al. 2020

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Membrane emulsification has the potential to revolutionize the energy-efficient production of uniform emulsions and dispersions, relevant to diverse fields from pharmaceutical active ingredient controlled release particles to Fast Moving Consumer Goods. A novel highly robust single-pass continuous phase crossflow system has been developed providing dispersed phase concentrations up to 40% vol/vol and dispersed phase fluxes up to 5,730 L m −2 hr −1 , from a single 100 mm long membrane tube. Extensive results of two oil-in-water systems (vegetable oil and PolyCaproLactone dissolved in DiC-hloroMethane) and one water-in-oil system (sodium silicate solution) are reported, using hydrophilic and hydrophobic membranes respectively. Mathematical models are validated enabling comprehensive engineering analysis of processes including predicted droplet size, membrane pressure drops, and energy requirement for dispersion production. Surfactant depletion, pore utilization, and droplet interaction at the membrane surface were investigated to provide a comprehensive analysis of the capabilities of novel annular-flow membrane emulsification for high throughput emulsion generation. K E Y W O R D S concentrated emulsion, energy-efficient emulsification, high throughput, modeling, surfactant positioning

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High throughput membrane emulsification using a single‐pass annular flow crossflow membrane

et al. 2020

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“…Both studies were performed at constant pressure and showed that an increase in viscosity led to a decrease in transmembrane flux and to smaller oil droplets due to increase of wall shear stress inside the membrane pores. Also, in DME, only few studies reported the production of W/O emulsions, mainly micron size emulsions with kerosene as the continuous phase with different types of membranes or surface modifications [18,19,20] or with toluene [21]. A study reported the production of W/O emulsions suitable for cosmetics or dermatological applications with mineral oil as the continuous phase [22].…”

Section: Introductionmentioning

confidence: 99%

Influence of viscosity for oil-in-water and water-in-oil nanoemulsions production by SPG premix membrane emulsification

Alliod

Messager

Fessi

et al. 2019

Chemical Engineering Research and Design

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Oil-in-water and water-in-oil nanoemulsions are interesting carriers for respectively oil soluble and water soluble actives. In this study, oil-in-water (O/W) and water-in-oil (W/O) nanoemulsions were prepared by premix membrane emulsification. A coarse emulsion (premix) was injected thanks to a high pressure pump through a Shirasu Porous Glass (SPG) membrane with pore size of 0.5 µm in order to reduce and homogenize the droplet size. The effect of viscosities on the pressure and droplet size was investigated: the water phase viscosity by increasing glycerol concentration, the oil phase viscosity with mineral oils of different viscosities and the overall emulsion viscosity by increasing the dispersed phase content of the emulsion. The pressure required to break up the droplets inside the membrane pores ∆P dis did not depend on viscosities, while the pressures generated by the flows through the pipe ∆P pipe and the membrane ∆P f low were proportional to the viscosity of the overall emulsion. W/O nanoemulsions were more difficult to produce and to characterize but thanks to the original setup working at pressures up to 65 bar and high flowrates, W/O mineral oil nanoemulsions were produced with mean droplets size around 600 nm and flow rate of 50 mL/min.

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“…Prior to use in ME, the SS membranes (both disc and tubular) and additional inner rod underwent a standard cleaning procedure. 26 Briefly, the items were immersed sequentially in an ultrasonic bath for 1 min in deionized water, 4 M NaOH, deionized water, 10 % wt citric acid, and finally deionized water. The items were soaked for 10 min in the acid and base solutions after sonication and were rinsed with tap water afterward, before being transferred to deionized water.…”

Section: Methodsmentioning

confidence: 99%

Keratin–Chitosan Microcapsules via Membrane Emulsification and Interfacial Complexation

Wilson

Ekanem

Mattia

et al. 2021

ACS Sustainable Chem. Eng.

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The continuous fabrication via membrane emulsification of stable microcapsules using renewable, biodegradable biopolymer wall materials keratin and chitosan is reported here for the first time. Microcapsule formation was based on opposite charge interactions between keratin and chitosan, which formed polyelectrolyte complexes when solutions were mixed at pH 5.5. Interfacial complexation was induced by transfer of keratin-stabilized primary emulsion droplets to chitosan solution, where the deposition of chitosan around droplets formed a core–shell structure. Capsule formation was demonstrated both in batch and continuous systems, with the latter showing a productivity up to 4.5 million capsules per minute. Keratin–chitosan microcapsules (in the 30–120 μm range) released less encapsulated nile red than the keratin-only emulsion, whereas microcapsules cross-linked with glutaraldehyde were stable for at least 6 months, and a greater amount of cross-linker was associated with enhanced dye release under the application of force due to increased shell brittleness. In light of recent bans involving microplastics in cosmetics, applications may be found in skin-pH formulas for the protection of oils or oil-soluble compounds, with a possible mechanical rupture release mechanism (e.g., rubbing on skin).

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Water in oil emulsions from hydrophobized metal membranes and characterization of dynamic interfacial tension in membrane emulsification

Cited by 12 publications

References 36 publications

High throughput membrane emulsification using a single‐pass annular flow crossflow membrane

High throughput membrane emulsification using a single‐pass annular flow crossflow membrane

Influence of viscosity for oil-in-water and water-in-oil nanoemulsions production by SPG premix membrane emulsification

Keratin–Chitosan Microcapsules via Membrane Emulsification and Interfacial Complexation

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