Sedimentation of nanoparticles in nanoscale colloidal suspensions

Ganguly, Suvankar; Chakraborty, Suman

doi:10.1016/j.physleta.2011.04.018

Cited by 35 publications

(19 citation statements)

References 43 publications

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“…The stability of our nanofluid suspensions was examined via the analyses of size, zeta potential, and sedimentation rates of SiO 2 NPs. The high surface free energy of SiO 2 NPs often causes the formation of large nanoaggregates that cannot remain in suspension (Ganguly and Chakraborty 2011). When the SiO 2 NPs leave suspension, they cannot connect at the liquid-liquid interface and alter the IFT.…”

Section: Heavy Crude Oilmentioning

confidence: 99%

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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Section: Heavy Crude Oilmentioning

confidence: 99%

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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“…The newly created larger agglomerates have then a greater tendency towards sedimentation (Ganguly, Chakraborty 2011). As a result of this process, also viscosity (Novák 2006;Ehrlich et al 1973), which is generally dependent on the number and size of particles in a unit of capacity, is changed.…”

Section: Change In the Stability Of A Liquid Dispersionmentioning

confidence: 99%

Influence of the Age of Epoxy Dispersion on the Effectiveness of Protection of Concrete Surfaces

Stehlík

2012

Engineering Structures and Technologies

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The scope of this paper is to test stability and mechanical and chemical properties of a modern freshly mixed epoxy dispersion, and as a variant, of a dispersion which is two years old. During ageing, the dispersion particles probably agglomerate, which is tested by laser diffraction and by sedimentation in a cylinder. Physical-mechanical tests assess the appearance, drying speed and mechanical properties of the film. Chemical tests focus on assessing the resistance of films of dispersions of different ages to common chemicals and to chemical defrosting agents. It is possible to say that two years of dispersion storage lead to a considerable increase in the diameter of a certain number of dispersion particles with the subsequent effect of increasing the sedimentation speed. The hardened film of a two-year old dispersion dries faster, has a rougher surface, is softer, but on the other hand, is less elastic and its adhesive capacity to the substrate is worse. Its chemical resistance is decreased but its defrosting agent resistance remains good. Due to the two-year storage of the epoxy dispersion, most of the monitored parameters decrease, nevertheless, certain protection of concrete structures by a hardened film of such epoxy dispersions is possible.

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“…To support the physical validity of the interested simulation, the nanoparticles’ relative concentration and the mean square displacement of an individual nanoparticle is assessed. This validation step is accomplished by comparing the obtained results with the experimental results of Hwang and colleagues and numerical results of Ganguly and Chakraborty in the literature.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of the influence of Brownian and gravitational forces on the stability of CuO nanoparticles by the Eulerian–Lagrangian approach

Aminfar

Mohammadpourfard

Mortezazadeh

2017

Heat Trans. Asian Res.

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This study investigates the influence of Brownian and gravitational forces on the velocity and transport of induced CuO nanoparticles in oil. Moreover, the concept of gravitational sedimentation and colloidal stability have been taken into consideration to give more physical insight about how these forces influence on the particle's displacement. For this purpose, the Lagrangian method has been proposed to compute the instantaneous location of the interested nanoparticle while the continuous medium behaviors are reflected by an Eulerian description. The relative concentration of the nanoparticles is measured to support the physical validity of the numerical procedure. It is observed that the predictions of the present Euler-Lagrange model are in good agreement with the reported experimental data in the literature. In the absence of the gravitational force, the velocity magnitude of the nanoparticles is decreased and the Brownian motion keeps the dispersion stable. The velocity of nanoparticles Nomenclature:, Cunningham correction factor; , Brownian diffusion coefficient, (m 2 ∕s); , diameter of nanoparticle, (m); , force, ( ); , gravitational acceleration, (= 9.81 m∕s 2 ); , height of vessel, (m); mean free Path of base fluid, (m); , volume of a computational cell, (m 3 )

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Sedimentation of nanoparticles in nanoscale colloidal suspensions

Cited by 35 publications

References 43 publications

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

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

Influence of the Age of Epoxy Dispersion on the Effectiveness of Protection of Concrete Surfaces

Numerical simulations of the influence of Brownian and gravitational forces on the stability of CuO nanoparticles by the Eulerian–Lagrangian approach

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