Effect of Surfactant‐Assisted Wettability Alteration on Immiscible Displacement: A Microfluidic Study

Yang, Weipeng; Brownlow, Joshua W.; Walker, Dustin; Lu, Jun

doi:10.1029/2020wr029522

Cited by 40 publications

(20 citation statements)

References 79 publications

(122 reference statements)

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“…Ligands and surfactants could bind to the surface of materials, typically via coordination bonds or charge interactions, thereby modifying the surface properties. They play a critical role in various fields such as biocompatibility [1,2], wetting treatment [3,4], anti-bacteria [5,6], and anti-corrosion [7,8]. For nanomaterials, high surface area is the basic characteristic, so that ligands are essential in reducing their surface energy.…”

Section: Introductionmentioning

confidence: 99%

Turning weak into strong: on the CTAB-induced active surface growth

et al. 2022

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Discovering new methods and principles in the inequivalent growth of equivalent facets is of great significance for going beyond symmetrical nanocrystals and for out-of-box exploration. In this work, we demonstrate that a middle ground exists between the traditional weak ligands and the strong ligands with unusual growth modes. By modifying the seed concentration during the growth of pentagonal Au nanorods, the typical weak ligand cetyltrimethylammonium bromide (CTAB) is made strong, leading to notches of restricted growth and even the active surface growth mode. In-depth investigation in the link between growth kinetics and ligand packing reveals the principle of their interplay --that the on-off dynamics of the ligands only allows for a certain limit of materials deposition rate. Beyond this limit, the growth materials build up and are then diverted elsewhere, leading to inequivalent growth. The fact that a freshly grown surface has few ligands promotes the active surface growth, focusing the growth materials onto a few sites. We believe that the knowhow of interfering ligand packing via growth kinetics would offer a powerful tool of synthetic control, where the facet-and curvature-dependent ligand packing is expected to be useful synthetic handles.

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Section: Introductionmentioning

confidence: 99%

Turning weak into strong: on the CTAB-induced active surface growth

et al. 2022

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“…In a word, the core became more hydrophilic after soaking with 0.4% GOBT. In other words, when injecting 0.4% GOBT into the tight reservoir, the surface of pore media changed to more hydrophilic and the adhesion force of pore surface to oil is reduced, which will be beneficial to the injection of viscoelastic fluid and the start-up and stripping of residual oil in pores, as well as the improvement of the recovery degree. − …”

Section: Resultsmentioning

confidence: 99%

CO₂-Low Interfacial Tension Viscoelastic Fluid Synergistic Flooding in Tight Reservoirs

Chen

Tang

et al. 2022

ACS Omega

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Tight oil reservoirs have poor physical properties, insufficient formation energy, and low natural productivity. CO 2 flooding is an important technical mean that enhances the oil recovery of dense reservoirs and achieves effective CO 2 sequestration, but strong heterogeneity of the tight oil reservoir usually results in gas channeling and poor enhanced oil recovery effect. The existing methods to prevent gas channeling are mainly to use the small-molecule amine system and the polymer gel system to plug fracture and high permeability channels. The smallmolecular amine system has low flash points and pollutes the environment and the polymer gel has poor injectivity and great damage to the formation, which limit their large-scale application. Therefore, a new viewpoint of CO 2 -low interfacial tension viscoelastic fluid synergistic flooding for enhanced oil recovery in a tight oil reservoir was made. The performance of low interfacial tension viscoelastic fluid (GOBT) was studied. The injectivity and oil displacement effect of CO 2 -GOBT synergistic flooding were evaluated, and the mechanism of CO 2 -GOBT synergistic flooding was discussed. The experimental results showed that 0.4% GOBT is a low interfacial tension viscoelastic fluid, which has strong adaptability to the salinity water of tight oil reservoirs (6788−80,000 mg/L), good viscosity stability at different pHs, excellent capacity to emulsify crude oil, and the ability to improve reservoir water wettability. CO 2 alternating 0.4% GOBT flooding has good injection ability in cores (K a = 0.249 mD), and injecting 0.4% GOBT can effectively increase the injection pressure of subsequent CO 2 flooding. CO 2 alternating 0.4% GOBT flooding can effectively improve water flooding recovery in tight sandstone reservoirs, which is better than CO 2 flooding and 0.4% GOBT flooding in both homogeneous and heterogeneous conditions. The mechanisms of CO 2 alternating 0.4% GOBT flooding to enhance the oil recovery include that GOBT and CO 2 foam block high permeability layers, shunt and sweep low permeability layers, and GOBT emulsify and wash oil. CO 2 partially dissolving in GOBT synergistically enhances the core water wettability, which improves GOBT injectability, emulsification, and stripping ability to residual oil.

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“…This review focuses on polymers as manufacturing material, because of their advantageous features for the manufacturing process. In general, the polymer surface should be altered to enhance wetting, and thereby reduce air bubble formation [ 114 ]. For affinity separation, the modification of the inert surface is essential to enable the binding of ligands.…”

Section: Microfluidics—how To Build An Affinity Exosome Separation Chipmentioning

confidence: 99%

Microfluidic Approaches for Affinity-Based Exosome Separation

Theel

Schwaminger²

2022

IJMS

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As a subspecies of extracellular vesicles (EVs), exosomes have provided promising results in diagnostic and theranostic applications in recent years. The nanometer-sized exosomes can be extracted by liquid biopsy from almost all body fluids, making them especially suitable for mainly non-invasive point-of-care (POC) applications. To achieve this, exosomes must first be separated from the respective biofluid. Impurities with similar properties, heterogeneity of exosome characteristics, and time-related biofouling complicate the separation. This practical review presents the state-of-the-art methods available for the separation of exosomes. Furthermore, it is shown how new separation methods can be developed. A particular focus lies on the fabrication and design of microfluidic devices using highly selective affinity separation. Due to their compactness, quick analysis time and portable form factor, these microfluidic devices are particularly suitable to deliver fast and reliable results for POC applications. For these devices, new manufacturing methods (e.g., laminating, replica molding and 3D printing) that use low-cost materials and do not require clean rooms are presented. Additionally, special flow routes and patterns that increase contact surfaces, as well as residence time, and thus improve affinity purification are displayed. Finally, various analyses are shown that can be used to evaluate the separation results of a newly developed device. Overall, this review paper provides a toolbox for developing new microfluidic affinity devices for exosome separation.

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Effect of Surfactant‐Assisted Wettability Alteration on Immiscible Displacement: A Microfluidic Study

Cited by 40 publications

References 79 publications

Turning weak into strong: on the CTAB-induced active surface growth

Turning weak into strong: on the CTAB-induced active surface growth

CO₂-Low Interfacial Tension Viscoelastic Fluid Synergistic Flooding in Tight Reservoirs

Microfluidic Approaches for Affinity-Based Exosome Separation

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Effect of Surfactant‐Assisted Wettability Alteration on Immiscible Displacement: A Microfluidic Study

Cited by 40 publications

References 79 publications

Turning weak into strong: on the CTAB-induced active surface growth

Turning weak into strong: on the CTAB-induced active surface growth

CO2-Low Interfacial Tension Viscoelastic Fluid Synergistic Flooding in Tight Reservoirs

Microfluidic Approaches for Affinity-Based Exosome Separation

Contact Info

Product

Resources

About

CO₂-Low Interfacial Tension Viscoelastic Fluid Synergistic Flooding in Tight Reservoirs