Droplet Coalescence and Spontaneous Emulsification in the Presence of Asphaltene Adsorption

Araujo, Simone Bochner de; Merola, Maria Consiglia; Vlassopoulos, Dimitris; Fuller, Gerald G.

doi:10.1021/acs.langmuir.7b02638

Cited by 76 publications

(89 citation statements)

References 43 publications

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“…Note, also, that the existence of a shear modulus is characteristic of the presence of quasi‐irreversibly adsorbed material at the interface. This shear modulus can be viscous or viscoelastic, as with lipids, or elastic‐dominated, as is often the case with particle assemblies; soluble surfactants, by contrast, possess negligible (possibly zero) shear viscosity …”

Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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imparts novel mechanical and functional properties to the macroscopic interface itself. These properties include size-and charge-selective pathways for molecules and particulates, shear and compressive moduli, and selective binding and reaction sites. Complex interfaces can then be used to generate complex, macroscopic, all-liquid materials with very high surface areas that have unique properties, such as compartmentalization, communication between compartments, and the ability to move and reconfigure. With the rapid growth in the study of complex materials made from interfacially structured liquids, there is a need to review the field from the funda-Liquid-fluid interfaces provide a platform both for structuring liquids into complex shapes and assembling dimensionally confined, functional nanomaterials. Historically, attention in this area has focused on simple emulsions and foams, in which surface-active materials such as surfactants or colloids stabilize structures against coalescence and alter the mechanical properties of the interface. In recent decades, however, a growing body of work has begun to demonstrate the full potential of the assembly of nanomaterials at liquid-fluid interfaces to generate functionally advanced, biomimetic systems. Here, a broad overview is given, from fundamentals to applications, of the use of liquid-fluid interfaces to generate complex, all-liquid devices with a myriad of potential applications. Figure 2.Interactions between particles attached to liquid-fluid interfaces. a) Dipole-dipole interactions between adsorbed particles due to asymmetric charge distributions near the surface of particles at interfaces. Reproduced with permission. [34] Copyright 1980, American Physical Society. b) Dipole-dipole interactions give rise to 2D colloidal crystals with large lattice spacings. Scale bar, 50 µm. Reproduced with permission. [36]

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Section: Quantitative Descriptions Of Complex Interfacesmentioning

confidence: 99%

Building Reconfigurable Devices Using Complex Liquid–Fluid Interfaces

et al. 2019

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“…Recently, S. Bochner de Araujo et al 9 , studying asphaltene solutions in toluene contacted to water, have presented the interfacial turbulence as being the main mechanism of formation of the micro-droplets of water inside the oil. They have studied the stability of water-inoil and oil-in-water emulsions and more particularly the coalescence phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Auto-Emulsification of Water at the Crude Oil/Water Interface: A Mechanism Driven by Osmotic Gradient

et al. 2019

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This work aims at studying the origin of spontaneous emulsification occurring at the oil/water interface. This phenomenon was observed for the five crude oils tested as well as at the interface of an asphaltene toluene mixture and water. The kinetics of appearance of water micro-droplets was slowed down for increasing salt concentrations and the micro-droplet formation ceases when the chemical potential of water they contain is equal to the one of the water in the bulk solution. Nucleation events occur at the oil-water interface and at the solid surface/liquid interface: some water microdroplets are stuck together close to the oil/water interface, others grow in oil and sediment or nucleate at the oil/solid surface. This suggests the following mechanism: water molecules diffuse from the water reservoir into the oil phase, and then create droplets. These droplets are simultaneously fed by hydrosoluble "osmogeneous" species increasing the osmotic pressure, inducing an osmotic pumping of water molecules into micro-droplets WATER OIL

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“…The first strain sweep in SSC1 showed values of G i 0 greater than any other interfacial gel aged in presence of NaCl (from time = 0 h), and, the presence of a slight overshoot in G i 00 (before the moduli crossover) indicating that the interfacial gel yields plastically, a phenomenon which is usually associated with an interconnected network structure. 40,41 The effective disruption of the network at larger strain was highlighted by a value of m = 1.7 and by a second amplitude sweep which did not recover a linear domain at low value of strains (g 0 o 1%). The moduli measured in the SSC2 segment performed after TS2 (Fig.…”

Section: Interfacial Shear Rheologymentioning

confidence: 99%

“…44 Similar phenomena have been recently observed for other oil-soluble surfactants across W/O interfaces. 40,45 This phenomenon is associated with a drastic decrease in g, compensating for the increase in surface area associated with droplet formation, which favours negative Gibbs free energy values leading to spontaneous droplet formation. 44 It is possible, qualitatively, to relate both g and |G i *| to the particle volume fractions at the interface (f i ) as g p 1/f i and, |G i *| p f i .…”

Section: Soft Matter Papermentioning

confidence: 99%