Preparation and mechanism of pH and temperature stimulus-responsive wormlike micelles

Fu, Haoran; Duan, Wengui; Zhang, Tailiang; Xu, Ke; Zhao, Hanfeng; Yang, Long; Zheng, Cunchuan

doi:10.1016/j.colsurfa.2021.126788

Cited by 18 publications

(18 citation statements)

References 29 publications

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“…Since WLMs are “living” objects that continuously break and reassemble, they easily change their structure to adapt to the variation of the external conditions. This makes their viscoelastic properties easily tunable by many triggers including temperature, shear, and different additives [ 4 , 5 , 6 , 7 , 8 ]. Responsive viscoelasticity of WLM solutions is widely used in a diverse range of applications from personal care products to oil recovery [ 1 , 2 , 3 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Dual Transient Networks of Polymer and Micellar Chains: Structure and Viscoelastic Synergy

et al. 2021

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Dual transient networks were prepared by mixing highly charged long wormlike micelles of surfactants with polysaccharide chains of hydroxypropyl guar above the entanglement concentration for each of the components. The wormlike micelles were composed of two oppositely charged surfactants potassium oleate and n-octyltrimethylammonium bromide with a large excess of anionic surfactant. The system is macroscopically homogeneous over a wide range of polymer and surfactant concentrations, which is attributed to a stabilizing effect of surfactants counterions that try to occupy as much volume as possible in order to gain in translational entropy. At the same time, by small-angle neutron scattering (SANS) combined with ultrasmall-angle neutron scattering (USANS), a microphase separation with the formation of polymer-rich and surfactant-rich domains was detected. Rheological studies in the linear viscoelastic regime revealed a synergistic 180-fold enhancement of viscosity and 65-fold increase of the longest relaxation time in comparison with the individual components. This effect was attributed to the local increase in concentration of both components trying to avoid contact with each other, which makes the micelles longer and increases the number of intermicellar and interpolymer entanglements. The enhanced rheological properties of this novel system based on industrially important polymer hold great potential for applications in personal care products, oil recovery and many other fields.

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Section: Introductionmentioning

confidence: 99%

Dual Transient Networks of Polymer and Micellar Chains: Structure and Viscoelastic Synergy

et al. 2021

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“…The solution will then exhibit the crimson colour of the Fe 2+ and Fe 3+ aqueous solutions. On the other hand, excessive H + leads to an increase in the repulsive force between the head groups of the OTAC molecule and destroys the WLM network structure, which results in large settlement of NCs [ 51 , 52 ]. From the results, when pH = 1, the settlement rate decreases, which does not mean that the settlement stability of the NC-VES becomes better, but that more NCs have been dissolved in the solution.…”

Section: Resultsmentioning

confidence: 99%

Experimental Study on the Stability of a Novel Nanocomposite-Enhanced Viscoelastic Surfactant Solution as a Fracturing Fluid under Unconventional Reservoir Stimulation

Ma³

et al. 2022

Nanomaterials

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Fe3O4@ZnO nanocomposites (NCs) were synthesized to improve the stability of the wormlike micelle (WLM) network structure of viscoelastic surfactant (VES) fracturing fluid and were characterized by Fourier transform infrared spectrometry (FT-IR), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). Then, an NC-enhanced viscoelastic surfactant solution as a fracturing fluid (NC-VES) was prepared, and its properties, including settlement stability, interactions between NCs and WLMs, proppant-transporting performance and gel-breaking properties, were systematically studied. More importantly, the influences of the NC concentration, shear rate, temperature and pH level on the stability of NC-VES were systematically investigated. The experimental results show that the NC-VES with a suitable content of NCs (0.1 wt.%) shows superior stability at 95 °C or at a high shear rate. Meanwhile, the NC-VES has an acceptable wide pH stability range of 6–9. In addition, the NC-VES possesses good sand-carrying performance and gel-breaking properties, while the NCs can be easily separated and recycled by applying a magnetic field. The temperature-resistant, stable and environmentally friendly fracturing fluid opens an opportunity for the future hydraulic fracturing of unconventional reservoirs.

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“…1A, we found that the enhancement of the viscosity is consistent with the elevation of the persistent length l p as the temperature increased, that is, the high viscosity is caused by the long l p . Note that Fu et al 41 developed a viscoelastic wormlike micellar system, including a quaternary ammonium surfactant (C 16 MIMBr) as the main agent and KBr as the counterion salt. This binary system showed obvious thermal responsiveness, that is, the system is a milky white low viscosity liquid when at low temperatures (<45 °C), but colorless transparent high viscoelastic solution when higher than 55 °C.…”

Section: Resultsmentioning

confidence: 99%

An insight into the thermo-thickening behavior of wormlike micellar solutions based on ultra-long-chain surfactants

Yin

Tian

Doutch

et al. 2022

Phys. Chem. Chem. Phys.

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Preparation and mechanism of pH and temperature stimulus-responsive wormlike micelles

Cited by 18 publications

References 29 publications

Dual Transient Networks of Polymer and Micellar Chains: Structure and Viscoelastic Synergy

Dual Transient Networks of Polymer and Micellar Chains: Structure and Viscoelastic Synergy

Experimental Study on the Stability of a Novel Nanocomposite-Enhanced Viscoelastic Surfactant Solution as a Fracturing Fluid under Unconventional Reservoir Stimulation

An insight into the thermo-thickening behavior of wormlike micellar solutions based on ultra-long-chain surfactants

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