Water mass transfer in W/O emulsions

Koroleva, M. Yu.; Yurtov, E. V.

doi:10.1016/j.jcis.2005.10.046

Cited by 21 publications

(29 citation statements)

References 22 publications

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“…One striking feature here is the complexity of their surface. They appear rough and covered by small polymorphous objects with micrometric sizes that look similar to the ones already evidenced in previous works for high concentrated solutions 18,35 . Local inversion of surfactant supersaturated regions could therefore be one possible driving mechanism here 19,20 .…”

Section: Qualitative Study Of Water Transportsupporting

confidence: 85%

“…This is observable on the top of the largest droplet of Figure 3(a) (red arrow) and in Figure 4. Similar submicron particles are known to be formed in SE either by polymers precipitation, self-assembly of macromolecules or polyelectrolyte complexes 18,35,54 . Submicron water droplets seem to be only loosely attached to the interface.…”

Section: Qualitative Study Of Water Transportmentioning

confidence: 98%

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Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

et al. 2017

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An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial-resolution image recording. The kinetics of spontaneous emulsification is studied. It is shown to generate a darkening of the drops because of interface modification with a characteristic time that depends upon the SPAN80 concentration. For low concentrations, spontaneous emulsification is slow and produces micrometer-sized droplets, whereas for large concentrations, it is fast and bush-like microstructures are observed. These microstructures increase in size and progressively invade the complete water/PO interfaces, detach, and finally migrate into the PO phase. This transport phenomenon withdraws water from the drops and leads to a gradual shrinking of their volume. At the end of this process, they appear as deformed objects surrounded by a loose membrane.

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Section: Qualitative Study Of Water Transportsupporting

confidence: 85%

Section: Qualitative Study Of Water Transportmentioning

confidence: 98%

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

et al. 2017

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“…Unlike traditionally stable double emulsions, O/O/W double emulsions prepared in our work cannot maintain their original morphology because huge difference of osmotic pressure between the inner oil phase and the outer aqueous outer phase drives water transport and phase separation. The process not only leads to the formation of the newly formed aqueous phase inside the inner oil phase, but more significantly, disturbs the inner/middle oil phase interface continuously . As aforementioned, inner cores here are spatially adjacent and therefore coalescence between cores is triggered under interfacial disturbance.…”

Section: Resultsmentioning

confidence: 97%

“…The process not only leads to the formation of the newly formed aqueous phase inside the inner oil phase, but more significantly, disturbs the inner/middle oil phase interface continuously. [58] As aforementioned, inner cores here are spatially adjacent and therefore coalescence between cores is triggered under interfacial disturbance. Indeed, the arrested coalescence is a more complex process.…”

Section: Osmosis-driven Arrested Coalescence Of Dual-core O/o/w Doublmentioning

confidence: 91%

Creation of Nonspherical Microparticles through Osmosis‐Driven Arrested Coalescence of Microfluidic Emulsions

Feng

Gao

Zhang

et al. 2019

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Droplet‐based microfluidics enable the production of emulsions and microparticles with spherical shapes, but the high‐throughput fabrication of nonspherical emulsions and microparticles still remains challenging because interfacial tension plays a dominant role during preparation. Herein, ionic liquids (ILs) containing salts, which possess sufficient osmotic pressure to realize water transport and phase separation, are introduced as inner cores of oil‐in‐oil‐in‐water double emulsions and it is shown that nonspherical emulsions can be constructed by osmosis‐driven arrested coalescence of inner cores. Subsequently, ultraviolet polymerization of the nonspherical emulsions leads to nonspherical microparticles. By tailoring the number, composition, and size of inner cores as well as coalescence time, a variety of nonspherical shapes such as dumbbell, rod, spindle, snowman, tumbler, three‐pointed star, triangle, and scalene triangle are created. Importantly, benefitting from excellent solvency of ILs, this system can serve as a general platform to produce nonspherical microparticles made from different materials. Moreover, by controlling the osmotic pressure, programmed coalescence of inner cores in double emulsions is realizable, which indicates the potential to build microreactors. Thus, a simple and high‐throughput strategy to create nonspherical microparticles with arrested coalescence shapes is developed for the first time and can be further used to construct novel materials and microreactors.

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“…This water transportation is caused by the difference in curvature radius of the dispersed phase droplets, and consequently, the difference in chemical potential of substances within the droplets. 43 As a result, small droplets become smaller and large droplets become larger, leading to droplet size growth and interfacial area reduction. Ostwald ripening rate depends on the average radius of droplets and ripening slows down when drops get larger.…”

Section: Emulsion Formulationmentioning

confidence: 99%

Micro-confinement of bacteria into w/o emulsion droplets for rapid detection and enumeration

Marcoux

Dupoy

Mathey

et al. 2011

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Single-cell characterisation and rapid enumeration of E. coli was achieved by confining them into the picoliter droplets of a water-in-oil fuorinated emulsion. Micro-confinement of Bacteria into w/o Emulsion Droplets for Rapid Detection and Enumeration AbstractToday, rapid detection and identification of bacteria in microbiological diagnosis is a major issue. Reference methods usually rely on growth of micro-organisms, with the drawback of lengthy time-to-result. The method provides global information on a clonal population that is known to be inhomogeneous relative to metabolic states and activities. Therefore, there may be a significant advantage of methods that allow characterization of individual bacteria from a large population, both for test time reduction and the clinical value of the characterization. We report here a method for rapid detection and real-time monitoring of the metabolic activities of single bacteria. Water-in-oil emulsions were used to encapsulate single Escherichia coli cells into picolitre (pL)-sized microreactor droplets. The glucuronidase activity in each droplet was monitored using the fluorogenic reporter molecule MUG (4-Methylumbelliferyl β-D-glucuronide) coupled to time-lapse fluorescence imaging of the droplets. Such bacterial confinement provides several major advantages. 2 1) Enzymatic activities of a large number of single bacterium-containing droplet could be monitored simultaneously, allowing the full characterization of metabolic heterogeneity in a clonal population. We monitored glucuronidase enzymatic activity and growth over ~200 single bacteria over a 24h-period. 2) Micro-confinement of cells in small volumes allows rapid accumulation of the fluorescent metabolite, hence decreasing the detection time. Independent of the initial concentration of bacteria in the sample, detection of the presence of bacteria could be achieved in less than two hours. 3) Considering the random distribution of bacteria in droplets, this method allowed rapid and reliable enumeration of bacteria in the initial sample. Overall, the results of this study showed that confinement of bacterial cells increased the effective concentration of fluorescent metabolites leading to rapid (2 h) detection of the fluorescent metabolites, thus significantly reducing time to numeration.

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Water mass transfer in W/O emulsions

Cited by 21 publications

References 22 publications

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

Creation of Nonspherical Microparticles through Osmosis‐Driven Arrested Coalescence of Microfluidic Emulsions

Micro-confinement of bacteria into w/o emulsion droplets for rapid detection and enumeration

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