Competitive adsorption of surfactants and hydrophilic silica particles at the oil–water interface: Interfacial tension and contact angle studies

Pichot, R.; Spyropoulos, Fotis; Norton, Ian T.

doi:10.1016/j.jcis.2012.01.065

Cited by 145 publications

(117 citation statements)

References 38 publications

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“…, that the formation of precipitates at the interface tend to slow down adsorption processes or the formation of a PL layer at the interface. The strong elastic behavior of lecithin at the air/water interface mentioned in Section 2.2 was also observed at the oil/water interface by Pichot et al [44]. As can be seen in Figure 4, adsorption of lecithin at the interface prevented two water droplets merging.…”

Section: Interfacial Properties Of Phospholipidssupporting

confidence: 64%

“…Consequently, changes in the dilational elasticity and viscosity are observed. The strong elastic character of phospholipids, in particular lecithin, was also reported by Norton and co-workers [43,44]. Figaszewski and co-workers, through a series of publications [37,39,45–47], have attempted to characterize surface behavior of phospholipids by measuring surface tension under various conditions of pH, PL mixtures and mixtures of PL and steroids such as cholesterol.…”

Section: Interfacial Properties Of Phospholipidsmentioning

confidence: 73%

“…From pictures ( a ) to ( c ), the needle is pushing down into the water droplet; on picture ( d ) the needle is pulling up out of the water droplet (the bar represents 2 mm). Reprinted with permission from Pichot et al [44], Copyright (2012) Elsevier.…”

Section: Figurementioning

confidence: 99%

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Phospholipids at the Interface: Current Trends and Challenges

Pichot

Watson

Norton

2013

IJMS

186

113

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Phospholipids are one of the major structural elements of biological membranes. Due to their amphiphilic character, they can adopt various molecular assemblies when dispersed in water, such as bilayer vesicles or micelles, which give them unique interfacial properties and render them very attractive in terms of foam or emulsion stabilization. This article aims at reviewing the properties of phospholipids at the air/water and oil/water interfaces, as well as the recent advances in using these natural components as stabilizers, alone or in combination with other compounds such as proteins. A discussion regarding the challenges and opportunities offered by phospholipids-stabilized structure concludes the review.

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Section: Interfacial Properties Of Phospholipidssupporting

confidence: 64%

Section: Interfacial Properties Of Phospholipidsmentioning

confidence: 73%

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Phospholipids at the Interface: Current Trends and Challenges

Pichot

Watson

Norton

2013

IJMS

186

113

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“…In emulsions stabilized by mixtures of particles and surfactants, the adsorption of surfactants is very fast at high surfactant concentrations and does not leave any room for the particles to adsorb to the interface. 167 As a result, such a system leads to solely surfactant-laden interfaces. In fact, if the concentration of a surfactant is increased in a particlestabilized system, it can lead to the desorption of particles from the interface.…”

Section: Phase Inversion Of Particle-stabilized Emulsionsmentioning

confidence: 99%

Recent Developments in Phase Inversion Emulsification

Kumar

Cheng

et al. 2015

Ind. Eng. Chem. Res.

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Emulsions are multiphasic fluid systems in which liquid droplets are dispersed in another immiscible liquid. The main components of an emulsion are the two liquid phases, typically oil and water, and the emulsifier, which stabilizes the interface between the two liquid phases. Emulsifiers can be a variety of molecules, such as polymers, amphiphilic surfactants, and proteins, and they can also be colloidal particles. Emulsion phase inversion is the process of interconversion between two types of simple emulsions: water-in-oil and oil-in-water emulsions. Phase inversion can be induced by shifting the emulsifier affinity from one phase to the other, which is called transitional phase inversion. It can also be triggered by a change in the water-to-oil ratio of the emulsion, which leads to a process known as catastrophic phase inversion. With recent advances in the stabilization of emulsions using colloidal particles and stimuli-responsive surfactants, numerous novel emulsion systems that undergo emulsion phase inversion by means of various mechanisms have been developed. In this review, we highlight the most recent developments in the field of emulsion phase inversion, focusing on transitional phase inversion, inversion of particle-stabilized emulsions, and flowand shear-induced phase inversion. We also discuss and compare state-of-the-art analytical methods that have been used to detect and understand the emulsion phase inversion process. Our coverage spans from the early concepts of Bancroft's rule through the concept of semiquantitative hydrophilic−lipophilic balance to the more recent theoretical models used to predict and control phase inversion phenomena. We conclude this review by presenting an outlook on the future directions and outstanding problems that warrant future investigations to fully understand the mechanism of emulsion phase inversion at the single-droplet level.

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“…Finally, the increased interaction between NPs from the large SiO 2 NP concentrations generates a strong capillary force at the interface that can withstand the distortion at the interface, and thus increase the IFT. Competition between SiO 2 NPs and surfactant for adsorption at the interface of oil-water system has also been reported by Pichot et al (2012).…”

Section: Effects Of Sio 2 Nanoparticles On Nonionic Surfactant Propermentioning

confidence: 57%

Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

Bai

Korte

et al. 2017

Appl Nanosci

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Any efficient exploitation of new petroleum reservoirs necessitates developing methods to mobilize the crude oils from such reservoirs. Here silicon dioxide nanoparticles (SiO 2 NPs) were used to improve the efficiency of the chemical-enhanced oil recovery process that uses surfactant flooding. Specifically, SiO 2 NPs (i.e., 0, 0.001, 0.005, 0.01, 0.05, and 0.1 wt%) and Tween Ò 20, a nonionic surfactant, at 0, 0.5, and 2 critical micelle concentration (CMC) were varied to determine their effect on the stability of nanofluids and the interfacial tension (IFT) at the oil-aqueous interface for 5 wt% brine-surfactantSiO 2 nanofluid-oil systems for West Texas Intermediate light crude oil, Prudhoe Bay medium crude oil, and Lloydminster heavy crude oil. Our study demonstrates that SiO 2 NPs may either decrease, increase the IFT of the brinesurfactant-oil systems, or exhibit no effects at all. For the brine-surfactant-oil systems, the constituents of the oil and aqueous substances affected the IFT behavior, with the nanoparticles causing a contrast in IFT trends according to the type of crude oil. For the light oil system (0.5 and 2 CMC Tween threshold concentration resulted in a decrease in IFT, and concentrations above this threshold resulted in an increase in IFT. The IFT decreased until the NP concentration reached a threshold concentration where synergetic effects between nonionic surfactants and SiO 2 NPs are the opposite and result in antagonistic effects. Adsorption of both SiO 2 NPs and surfactants at an interface caused a synergistic effect and an increased reduction in IFT. The effectiveness of the brine-surfactant-SiO 2 nanofluids in decreasing the IFT between the oil-aqueous phase for the three tested crude oils were ranked as follows: (1) Prudhoe Bay [ (2) Lloydminster [ and (3) West Texas Intermediate. The level of asphaltenes and resins in these crude oil samples reflected these rankings. A decrease in the IFT also indicated the potential of the SiO 2 NPs to decrease capillary pressure and induce the movement and recovery of oil in original water-wet reservoirs. Conversely, an increase in IFT indicated the potential of SiO 2 NPs to increase capillary pressure and oil recovery in reservoirs subject to wettability reversal under water-wet conditions. Raspberrylike morphology particles were discovered in 5 wt% brinesurfactant-SiO 2 nanofluid-oil systems. The development of raspberry-like particles material with high surface area, high salt stability, and high capability of interfaces alteration and therefore wettability changes offers a wide range of applications in the fields of applied nanoscience, environmental engineering, and petroleum engineering.

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Competitive adsorption of surfactants and hydrophilic silica particles at the oil–water interface: Interfacial tension and contact angle studies

Cited by 145 publications

References 38 publications

Phospholipids at the Interface: Current Trends and Challenges

Phospholipids at the Interface: Current Trends and Challenges

Recent Developments in Phase Inversion Emulsification

Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

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