Chapter 12. Applications of Wormlike Micelles in the Oilfield Industry

Sullivan, Philip F.; Panga, Mohan; Lafitte, Valerie

doi:10.1039/9781782629788-00330

Cited by 11 publications

(10 citation statements)

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“…40,41 WLMs that are responsive under acidic conditions are particularly attractive as they could have an important application in oil recovery (acid diversion in carbonate rocks). 17,42 Light as a stimulus to trigger changes in WLMs is advantageous in many ways. Compared to other stimuli, light is noninvasive and can be introduced without affecting the sample composition.…”

Section: Introductionmentioning

confidence: 99%

“…Because the chains are long and polymer-like, solutions of WLMs exhibit viscoelastic properties. Because of these viscoelastic properties, WLMs find application as drag reducing agents, in enhanced oil recovery, in home and personal care products, and more. − …”

Section: Introductionmentioning

confidence: 99%

“…There are several studies describing smart WLMs that are responsive to pH. The various strategies in these studies include the use of a pH-responsive surfactant, ,, the combination of a conventional surfactant and a pH-responsive organic compound such as oxalic acid, hydroxycinnamic acid, or benzenedioic acid, and the incorporation of CO 2 . ,− It is possible to formulate pH-responsive WLMs that can be triggered over any pH rangeacidic, , neutral, or basic. , WLMs that are responsive under acidic conditions are particularly attractive as they could have an important application in oil recovery (acid diversion in carbonate rocks). , …”

Section: Introductionmentioning

confidence: 99%

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Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

2020

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“Smart” fluids displaying large changes in their rheological properties in response to external stimuli have been of great interest in recent years. For example, “smart” wormlike micelles (WLMs) that respond to pH can be readily formulated by combining a cationic surfactant such as cetyltrimethylammonium bromide (CTAB) with an aromatic compound such as 1,2-dihydroxybenzene (DHB). Here, we show that a pH-responsive aqueous formulation as mentioned above can be simultaneously made responsive to ultraviolet (UV) light by incorporating a photoacid generator (PAG) into the system. A commercially available PAG, diphenyliodonium-2-carboxylate, is used here. Upon exposure to UV light, this PAG irreversibly photolyzes into iodobenzene (IB) and benzoic acid (BA), with the formation of BA, leading to a drop in pH. WLMs formed by mixtures of CTAB, DHB, and the PAG are systematically characterized before and after UV irradiation. As the PAG photolyzes, an increase in the viscosity of WLMs occurs by a factor of 1000. We show that the ratio of the zero-shear viscosity η0 (after UV/before UV) depends on the initial pH of the sample. The UV-induced increase in η0 can be attributed to the growth of WLMs in solution, which in turn is influenced by both the ionization state of DHB and the presence of IB and BA.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

2020

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“…Upon the variation of solution's composition, peaks in viscosity are often observed [14][15][16][17][18][19], which can be explained with the formation of giant entangled wormlike micelles and their size and shape transformations [9,20,21,22]. The prediction and control of micelle growth and viscosity of formulations from concentrated surfactant solutions is an issue of primary importance for the personal-care and house-hold detergency [23][24][25][26], as well as in oilfield industry [27]. A comprehensive review on wormlike micelles can be found in our recent article, Ref.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of micelle growth. 1. Chain-conformation free energy of binary mixed spherical, wormlike and lamellar micelles

Danov

Kralchevsky

Stoyanov

et al. 2019

Journal of Colloid and Interface Science

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Hypotheses:A quantitative molecular-thermodynamic theory of the growth of giant wormlike micelles of nonionic surfactants can be developed on the basis of a generalized model, which includes the classical 'phase separation' and 'mass action' models as special cases. The generalized model describes spherocylindrical micelles, which are simultaneously multicomponent and polydisperse in size. Theory: By analytical minimization of the free-energy functional we derived explicit expressions for the chain-extension and chain-end distribution functions in the hydrocarbon core of mixed micelles from two surfactants of different chainlengths. Findings:The hydrocarbon core of a two-component micelle is divided in two regions, outer and inner, where the ends of the shorter and longer chains are located. The derived analytical expression for the chain-conformation free energy implies that the mixing of surfactants with different chainlengths is always nonideal and synergistic, i.e. it leads to decrease of the micellar free energy and to enhancement of micellization and micelle growth. The derived expressions are applicable to surfactants with different headgroups (nonionic, ionic, zwitterionic) and to micelles of different shapes (spherical, wormlike, lamellar). The results can be incorporated in a quantitative theory of the growth of giant mixed micelles in formulations with practical applications in detergency.

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“…Wormlike micelles constructed with surfactants have attracted great interest of scientists due to their unique rheological behavior and extensive applications. − Based on the excellent and adjustable viscoelastic properties, the response of stimuli-responsive wormlike micelles to external triggers such as pH, CO 2 , , temperature, light, − redox reactions, or magnetic field has attracted great attention in the field of soft materials. − Among them, the photoresponsive viscoelastic fluids composed of wormlike micelles are of particular interest because the UV light is easily accessible, clean and pollution free, noninterfering, and controllable. , These viscoelastic fluids with light-tunable rheology can find wide applications in microscale or nanoscale devices such as microflow sensors, drag-reducing fluids, rheology control, drug release, and so on.…”

Section: Introductionmentioning

confidence: 99%

Photoresponsive Behavior of Wormlike Micelles Constructed by Gemini Surfactant 12-3-12·2Br^– and Different Cinnamate Derivatives

et al. 2019

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The photoresponsive wormlike micelles constructed by Gemini surfactants and cinnamate derivatives play a great role in the field of smart materials. However, how the structure of cinnamate derivatives affects the photoresponsive behavior of micelles is still a hotspot for scientists to research. Here, three kinds of aromatic salts with different ortho-substituted groups including trans-o-methoxy cinnamate (trans-OMCA), trans-o-hydroxy cinnamate (trans-OHCA), and trans-cinnamate (trans-CA) were introduced into Gemini surfactant 12-3-12·2Br– aqueous solutions to construct photoresponsive wormlike micelles through their noncovalent interactions. Their properties were researched using the rheological method, cryo-transmission electron microscopy, and 1H NMR and two-dimensional nuclear Overhauser effect spectra. The results show that these cinnamate derivatives could well construct wormlike micelles with 12-3-12·2Br–. Furthermore, subtle differences in the ortho substituents’ structure have a significant effect on the photoresponsive behavior of formed wormlike micelles. Specifically, the zero viscosity (η0) of 40 mM 12-3-12·2Br–/24 mM trans-OHCA mixed solution decreases from 26.72 to 2.6 Pa·s with the shortening of the length of wormlike micelles after UV irradiation. Correspondingly, the η0 for the same ratio of 12-3-12·2Br–/trans-OMCA decreases from 2.42 to 0.06 Pa·s and the wormlike micelles are transited into rodlike micelles and even spherical micelles after the same UV irradiation time. However, the variation of wormlike micelles in the 12-3-12·2Br–/trans-CA system induced by UV light is not obvious with η0 being maintained at around 2.89 Pa·s. This study will help us better understand the effects of chemical groups on macrophenomena and microinteraction for micellar systems. It provides a theoretical basis for the construction of photoresponsive micelles, thus widening their application in the field of soft materials.

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Chapter 12. Applications of Wormlike Micelles in the Oilfield Industry

Cited by 11 publications

References 0 publications

Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

Analytical modeling of micelle growth. 1. Chain-conformation free energy of binary mixed spherical, wormlike and lamellar micelles

Photoresponsive Behavior of Wormlike Micelles Constructed by Gemini Surfactant 12-3-12·2Br^– and Different Cinnamate Derivatives

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Chapter 12. Applications of Wormlike Micelles in the Oilfield Industry

Cited by 11 publications

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Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

Light-Triggered Rheological Changes in a System of Cationic Wormlike Micelles Formulated with a Photoacid Generator

Analytical modeling of micelle growth. 1. Chain-conformation free energy of binary mixed spherical, wormlike and lamellar micelles

Photoresponsive Behavior of Wormlike Micelles Constructed by Gemini Surfactant 12-3-12·2Br– and Different Cinnamate Derivatives

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Product

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Photoresponsive Behavior of Wormlike Micelles Constructed by Gemini Surfactant 12-3-12·2Br^– and Different Cinnamate Derivatives