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enhancement of ostwald ripening by depletion flocculation

enhancement of ostwald ripening by depletion flocculation

Enhancement of Ostwald Ripening by Depletion

2008-6-21 · This depletion flocculation enhancement in ripening rates in the presence of SDS micelles provides another, alternative, and self-consistent mechanism for the effect of surfactant micelles on Ostwald ripening.

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Enhancement of Ostwald Ripening by Depletion

Therefore, it can be assumed that depletion flocculation is improbable pathway to Ostwald ripening in the investigated system as opposed to the surfactant-stabilized octane-and decane-in-water ...

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Enhancement of Ostwald Ripening by Depletion Flocculation

Langmuir 2008, 24, 7711-7717 7711 Enhancement of Ostwald Ripening by Depletion Flocculation Alex M. Djerdjev and James K. Beattie* School of Chemistry, UniVersity of Sydney, New South Wales 2006, Australia ReceiVed January 15, 2008.

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Okra extracts in pharmaceutical and food applications ...

2014-12-15 · Therefore, it can be assumed that depletion flocculation is improbable pathway to Ostwald ripening in the investigated system as opposed to the surfactant-stabilized octane- and decane-in-water emulsions (Djerdjev & Beattie, 2008). Moreover, in the absence of flocculation coalescence in emulsions leads to a reduction of their viscosity.

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Depletion Flocculation | Practical Solubility Science ...

Frustratingly, if we add a little too much polymer, we can de-stabilize the system via a non-intuitive effect called Depletion Flocculation. To get a feel for the effect, play with the radius of the particles, the radius ("radius of gyration") of the polymer, its concentration

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Self-Depletion Flocculation of Tetralin Oil-in-Water ...

2005-11-23 · Oil-in-water emulsions of slightly soluble oils such as tetralin prepared by high-pressure homogenization and stabilized by sodium dodecyl sulfate undergo depletion flocculation induced by an initially polydisperse droplet size distribution. The smaller droplets flocculate the larger ones; the flocculation can be reversed by gentle sonication. After aging, the flocs disappear because the ...

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乳状液稳定性表征方法及其在农药水乳剂研发中的应用

2015-1-2 · Verma S, Kumar S, Gokhale R, et al. Physical stability of nanosuspensions: investigation of the role of stabilizers on ostwald ripening[J]. Int J Pharm, 2011, 406(1-2): 145-152. [34] Meliana Y, Cala N A, Lin C T, et al. Ostwald ripening of two-component disperse

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Self-depletion flocculation of tetralin oil-in-water ...

2006-1-1 · The smaller droplets flocculate the larger ones; the flocculation can be reversed by gentle sonication. After aging, the flocs disappear because the smaller droplets dissolve through Ostwald ripening. These effects were observed by electroacoustic

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Influence of NaCl on the oil/water interfacial and ...

2017-11-1 · The flocculation usually cannot be detected by particle size measurement since dilution or any mechanical action would destroy the weak and reversible interactions between flocs (Djerdjev & Beattie, 2008). Commonly, microscopy is applied to directly show depletion flocculation in the emulsion.

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Influence of Alcohol on Stability of Oil-in-Water ...

Ostwald ripening is probably the main reason for the stepwise reduction in oil concentration in the serum phase of the stored alcohol-containing emulsions. Time-dependent rheology measurements of alcohol-rich emulsions showed an apparent shear viscosity increasing steadily over a matter of hours, suggesting that flocculation was not eliminated ...

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Aging of oil-in-water emulsions: the role of the oil

Further, we show that while Ostwald ripening is the dominant destabilisation mechanism, two distinct regimes are evident. Initially, we observed an enhanced Ostwald ripening regime due to the presence of oil-swollen micelles in the aqueous continuum, that is a depletion flocculation mechanism is followed.

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Okra extracts in pharmaceutical and food applications ...

2014-12-15 · Therefore, it can be assumed that depletion flocculation is improbable pathway to Ostwald ripening in the investigated system as opposed to the surfactant-stabilized octane- and decane-in-water emulsions (Djerdjev & Beattie, 2008). Moreover, in the absence of flocculation coalescence in emulsions leads to a reduction of their viscosity.

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Self-Depletion Flocculation of Tetralin Oil-in-Water ...

42 Flocculation was not observed, larger z-potentials were found, and Ostwald ripening was significantly suppressed. However, evaporation of the soluble oil component after 1 day was found for ...

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Depletion Flocculation | Practical Solubility Science ...

Frustratingly, if we add a little too much polymer, we can de-stabilize the system via a non-intuitive effect called Depletion Flocculation. To get a feel for the effect, play with the radius of the particles, the radius ("radius of gyration") of the polymer, its concentration

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Influence of Nanoemulsion Addition on the Stability of ...

2015-5-10 · Nevertheless, certain kinds of nanoparticles may also promote depletion flocculation in emulsions , with the depletion interaction depending of the nature of the particles . The rate of Ostwald ripening may also be accelerated in mixed colloidal dispersions containing small and large droplets.

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Enhancement of physicochemical properties of

Ostwald ripening analysis. Figure 3 shows the Ostwald ripening effect, influenced by different storage temperature and nanoemulsion composition. Storage at 4°C for both nanoemulsions (Opt1 and Opt2) demonstrated excellent stability, with no significant changes in particle size at low Ostwald ripening rate (0.007 nm 3 /second and 0.0019 nm 3 ...

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De Gruyter Textbook

Reduction of flocculation by enhancing the repulsive forces. Chapter 10 Ostwald Ripening and its Reduction Factors responsible for Ostwald ripening : difference in solubility between small and large droplets and the Kelvin equation. Calculation of the rate of Ostwald ripening.

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Yacine Hemar-深圳大学高等研究院

2020-5-7 · Enhancement of coalescence by xanthan addition to oil-in-water emulsions formed with extensively hydrolysed whey proteins. Food Hydrocolloids, 18(5), 737-746. 18. Ye, A.*, Hemar, Y., & Singh, H. (2004). Flocculation and coalescence of droplets in oil-in-water

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乳状液稳定性表征方法及其在农药水乳剂研发中的应用

2015-1-2 · Verma S, Kumar S, Gokhale R, et al. Physical stability of nanosuspensions: investigation of the role of stabilizers on ostwald ripening[J]. Int J Pharm, 2011, 406(1-2): 145-152. [34] Meliana Y, Cala N A, Lin C T, et al. Ostwald ripening of two-component disperse

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Emulsion Formation and Stabilization by Biomolecules: The ...

2019-9-26 · Droplet aggregation (or flocculation) occurs when droplets attract each other, forming a loosely clumped mass of particles (“flocs”). Lastly, Ostwald ripening is caused by the difference in pressure inside large and small droplets, which leads to a

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Enhancement of physicochemical properties of

Ostwald ripening analysis. Figure 3 shows the Ostwald ripening effect, influenced by different storage temperature and nanoemulsion composition. Storage at 4°C for both nanoemulsions (Opt1 and Opt2) demonstrated excellent stability, with no significant changes in particle size at low Ostwald ripening rate (0.007 nm 3 /second and 0.0019 nm 3 ...

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(PDF) Self-Depletion Flocculation of Tetralin Oil-in-Water ...

The effects described appear a depletion mechanism due to nonadsorbing polymers, particles, to be general, however, for oils of moderate solubility in water; or micelles.1 we have observed similar behavior with emulsions of hexane Depletion flocculation is an entropic effect that occurs because (10 ppm), toluene (515 ppm), and p-cymene ...

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Emulsions - De Gruyter

2016-3-21 · Chapter 1 General Introduction Definition of emulsions and the role of the emulsifier. Classification based on the nature of the emulsifier. Classification based on the structure of the system. General instability problems with emulsions : creaming/sedimentation, flocculation, Ostwald ripening, coalescence and phase inversion. Importance of emulsions in various industrial applications. Chapter ...

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D. Julian McClements publications

2001-10-19 · D.J. McClements. (2000). Comments on viscosity enhancement and depletion flocculation by polysaccharides. Food Hydrocolloids, 14, 173-177. K. Demetriades and D.J. McClements (2000). Influence of sodium dodecyl sulfate on the physicochemical properties of whey protein stabilized emulsions. Colloids and Surfaces A. 161, 391-400.

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Super liquid repellent surfaces for anti-foaming and froth ...

2021-9-9 · Defoaming in bulk foams stems from a combination of (1) gravitational drainage of liquid, (2) Ostwald ripening, (3) interfacial force-driven film thinning, and (4) spontaneous film rupture.

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Polymeric Surfactants: Dispersion Stability and Industrial ...

6.4 Depletion flocculation|85 6.5 Bridging flocculation by polymers and polyelectrolytes|86 7 Polymeric surfactants for stabilization of emulsions and nanoemulsions|91 7.1 Introduction|91 7.2 Polymeric surfactants for prevention of emulsion and nanoemulsion flocculation|92 7.3 Polymeric surfactants for reduction of Ostwald ripening|94

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Journal of the American Ceramic Society: Vol 82, No 10

2004-12-21 · William G. (Bill) Fahrenholtz, JACerS editor-in-chief, is Curators’ Distinguished Professor of Ceramic Engineering at Missouri University of Science and Technology, specializing in processing, characterization, and thermodynamic analysis

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乳状液稳定性表征方法及其在农药水乳剂研发中的应用

2015-1-2 · Verma S, Kumar S, Gokhale R, et al. Physical stability of nanosuspensions: investigation of the role of stabilizers on ostwald ripening[J]. Int J Pharm, 2011, 406(1-2): 145-152. [34] Meliana Y, Cala N A, Lin C T, et al. Ostwald ripening of two-component disperse

Read More