pH-switchable wormlike micelles with high viscoelasticity formed by pseudo-oligomeric surfactants

Performance Evaluation and Mechanism Study of Seawater-Based Circulatory Fracturing Fluid Based on pH-Regulated WormLike Micelles

“…The η 0 increases slowly with the concentration, which indicates that the branching point of the wormlike micelles of the system may occur and the branching behavior is strengthened. The appearance of the branching wormlike micelles is mainly due to the strong electrostatic shielding effect of CTAB in the system ( Liu et al, 2021a ).…”

“…Therefore, it is a critical problem to realize reversible gel breaking with controllable time, complete gel breaking, and low cost for constructing a clean fracturing fluid system. To solve this problem, this article aims to realize the reversible gel breaking of clean fracturing fluid by introducing intelligent control switch, compared with intelligent control switch such as light, oxidation, CO 2 , and temperature; pH switches are time-controlled, thoroughly regulated and cost-effective, with good biocompatibility and high surface activity, so pH-sensitive surfactant is suitable as thickeners for clean fracturing fluids ( Liu et al, 2021a ; Yu et al, 2021 ; Mu et al, 2022 ).…”

Imparting pH and temperature dual-responsiveness in a micellar solution of cationic surfactants by introducing a hydrotrope

“…37 Pei et al prepared a pH-responsive pseudo-oligomer surfactant solution using N -(3-(dimethylamine) propyl) stearamide and phthalic acid. 38 The results show that the pseudo-oligomeric surfactant readily formed viscoelastic wormlike micelles and showed remarkable thickening ability, and the viscoelastic fluid was highly sensitive to pH, and the viscosity decreased rapidly by adding a small amount of acid or alkali. Kang et al demonstrated the pH- and temperature-responsive behaviors of a mixed solution of N -erucamidopropyl- N , N -dimethylamine (UC 22 AMPM) and isomers of phthalic acid.…”

“…Several studies have suggested that the addition of sodium hydrogen phthalate (SHP) to cationic surfactant solutions can invoke pH- or temperature-responsiveness in mixed micelle solutions, which is fascinating due to the reversible molecular recognition properties of such solutions. 37–40 Huang et al proved that potassium phthalic acid can promote the growth of cetyltrimethylammonium bromide (CTAB) micelles into entangled structures in aqueous media, and they proposed a facile route to design pH-responsive viscoelastic fluids by adjusting the interaction between the surfactant and the additive. 37 Pei et al prepared a pH-responsive pseudo-oligomer surfactant solution using N -(3-(dimethylamine) propyl) stearamide and phthalic acid.…”

Rheological behavior of thread-like fiber solutions formed from a rosin-based surfactant with two head groups

“…14 The viscoelasticity of the solutions originates from the interactions of aggregates formed by surfactants. Variations in solution pH, [15][16][17] ionic strength, 18,19 or temperature 20,21 have tremendous effects on the aggregate morphology as well as the molecular interactions, which further leads to the variations in solution viscoelasticity. By introducing suitable functional components, the physicochemical properties of these systems can be modulated or even switched by external triggers, showing the potential feasibility of smart soft materials.…”