Quantitative effect of droplet size and emulsion viscosity on the storage stability of asphalt emulsion

Ouyang, Jian; Meng, Yan

doi:10.1016/j.conbuildmat.2022.127994

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…In order to illustrate the findings graphically, we consider the size of liquid droplets varying from several orders of nanometers to the order of micrometers. Such a size of droplet often appears in nano/microemulsion droplets − and in several other fields of microfluidic and nanofluidic operations − indicated earlier. We present the results considering a wide range of droplet viscosity to cover the case of gas bubbles, dielectric oil droplets, and rigid colloids (η d → ∞).…”

Section: Resultsmentioning

confidence: 72%

Dynamic Electrophoresis of a Hydrophobic and Dielectric Fluid Droplet

Chowdhury,

Mahapatra,

Ohshima

et al. 2023

Langmuir

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Dynamic electrophoresis is the foundation for electroacoustical measurements, in which the electroacoustical signals may be used to analyze the size and electrostatic charge of colloidal entities by means of the results for dynamic electrophoretic mobility. Thus, the electrophoresis under an alternating electric field is the key foundation for electroacoustic theory. In this article, we develop a tractable analytical theory for the dynamic electrophoresis of hydrophobic and dielectric fluid droplets possessing uniform surface charge density. The tiny fluid droplets possess charged mobile surfaces and have found widespread applications in our day-to-day life. For dielectric fluid droplets (e.g., oil–water emulsions), the tangential electric stress at the interface is nonzero, which significantly affects its electrohydrodynamics under an oscillatory electric field, which has, however, a negligible impact on the electrophoretic motion of conducting droplets (e.g., mercury droplets). Besides, the micro/nanoscale fluid droplets often show hydrophobicity when they are immersed in an aqueous medium, and the impact of the electric field on hydrophobic surfaces remains a research frontier in the chemical discipline. Whereas a number of approximate expressions for electrophoretic mobility have been derived for the conducting droplet, none of them are applicable to such generic hydrophobic fluid droplets with dielectric permittivity that is significantly lower than or comparable to that of an aqueous medium. In this work, within the Debye–Hückel electrostatic framework, we elaborate an original analytical expression of dynamic electrophoretic mobility for this generic dielectric fluid droplet with a hydrophobic surface considering that the droplet retains its spherical shape during its oscillatory motion. We further derived a set of simplified expressions for dynamic electrophoretic mobility deduced under several limiting cases. The results are further illustrated, indicating the impact of pertinent parameters.

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Section: Resultsmentioning

confidence: 72%

Dynamic Electrophoresis of a Hydrophobic and Dielectric Fluid Droplet

Chowdhury,

Mahapatra,

Ohshima

et al. 2023

Langmuir

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“…However, clarifying the stability mechanism of heavy oil-water emulsions is the foundation of the efficient separation of heavy-oil water. In addition, a large number of studies have shown that the oil-water interfacial films formed by the natural surface-active components (asphaltenes, resins, naphthenic acid, amphiphilic solid particles) at the oil-water interface plays a major role in stabilizing heavy oil-water emulsions [71][72][73][74]. Therefore, in the following sections, the structural characteristics of natural surface-active components and the interface properties of oil-water interfacial films will be reviewed and discussed.…”

Section: Structural Characteristics Of Natural Surfactantsmentioning

confidence: 99%

A Review of Oil–Solid Separation and Oil–Water Separation in Unconventional Heavy Oil Production Process

Xiao

Geng

et al. 2022

IJMS

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Unconventional heavy oil ores (UHO) have been considered an important part of petroleum resources and an alternative source of chemicals and energy supply. Due to the participation of water and extractants, oil–solid separation (OSS) and oil–water separation (OWS) processes are inevitable in the industrial separation processes of UHO. Therefore, this critical review systematically reviews the basic theories of OSS and OWS, including solid wettability, contact angle, oil–solid interactions, structural characteristics of natural surfactants and interface characteristics of interfacially active asphaltene film. With the basic theories in mind, the corresponding OSS and OWS mechanisms are discussed. Finally, the present challenges and future research considerations are touched on to provide insights and theoretical fundamentals for OSS and OWS. Additionally, this critical review might even be useful for the provision of a framework of research prospects to guide future research directions in laboratories and industries that focus on the OSS and OWS processes in this important heavy oil production field.

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“…Low-permeability reservoirs are usually developed by chemical displacement and seepage [3]. Despite the low viscosity of light crude oil and the low-colloidal asphaltene dosage, a significant number of polymer additives in the oilfield production process has increased emulsion stability, increasing the difficulty of demulsification [4,5]. Heat treatment, chemical demulsification, physical demulsification, and biological demulsification are frequent methods, with chemical demulsification technology being the most extensively utilized in oilfields.…”

Section: Introductionmentioning

confidence: 99%

Efficient Demulsification Performance of Emulsified Condensate Oil by Hyperbranched Low-Temperature Demulsifiers

Jiang,

Li,

et al. 2023

Molecules

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Focusing on the problem of poor demulsification performance of light crude oil emulsions in low-permeability oilfields at low temperatures, the composition of the emulsion samples, clay particle size distribution, and the viscosity–temperature relationship curve of samples were analyzed. Based on the results of emulsion composition analysis and characteristics, the bottle test method was used to analyze the demulsifying effect of different commercial types of demulsifiers, revealing the demulsification mechanism. The field tests confirm the demulsification capabilities of Polyoxyethylene polyoxypropylene quaternized polyoxyolefins surfactants (PR demulsifiers). The results reveal that PR demulsifiers combine the features of decreasing the interfacial tension between oil and water and adsorbing SiO2, allowing for quick demulsification and flocculation at low temperatures. This research serves as a theoretical and practical foundation for the study and advancement of low-temperature demulsification technology in oilfields.

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Quantitative effect of droplet size and emulsion viscosity on the storage stability of asphalt emulsion

Cited by 18 publications

References 22 publications

Dynamic Electrophoresis of a Hydrophobic and Dielectric Fluid Droplet

Dynamic Electrophoresis of a Hydrophobic and Dielectric Fluid Droplet

A Review of Oil–Solid Separation and Oil–Water Separation in Unconventional Heavy Oil Production Process

Efficient Demulsification Performance of Emulsified Condensate Oil by Hyperbranched Low-Temperature Demulsifiers

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