Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Zhao, Ya; Haward, Simon J.; Shen, Amy Q.

doi:10.1122/1.4928454

Cited by 34 publications

(41 citation statements)

References 138 publications

(186 reference statements)

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“…, which yields the zero shear rate viscosity Z 0 = 130 Pa s, the infinite shear rate viscosity Z N = 3 mPa s, characteristic shear rate for onset of shear thinning _ g* = 0.022 s À1 , transient control factor a = 1.5 and power law index in the shear thinning region n = 0.05, see Table 1. As shown in a previous publication, 75 the crossover frequency for G 0 and G 00 obtained from a small amplitude oscillatory shear sweep gives a longest relaxation time of l r = 50.3 s, which is reasonably consistent with the value of 1/_ g* = 45.5 s.…”

Section: Rheological Characterizationssupporting

confidence: 90%

“…This salt/surfactant concentration ratio falls within the semi-dilute regime containing entangled WLMs. 75 The strong hydrophobicity and naphthalene structure present in the SHNC enable strong non-covalent bonds (cation-p and p-p) between adjacent micelles, see schematics in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, micelles in this particular CTAB/SHNC system have shown persistent birefringence after the cessation of flow, 8,76 with stronger viscoelasticity when compared to other cationic surfactant-salt systems. 75 To highlight the hydrodynamic and structural instability in wormlike micellar solutions, we also prepared a Newtonian fluid that consists of 92 wt% glycerol mixed with DI water, with a constant viscosity of 0.15 Pa s at 25 1C. We chose proper flow rates for control experiments with the Newtonian solution in the microdevices to cover the same Re range as those resulting in subsequent experiments with the WLM solution.…”

Section: Methodsmentioning

confidence: 99%

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Flow of wormlike micellar solutions around confined microfluidic cylinders

2016

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Wormlike micellar (WLM) solutions are frequently used in enhanced oil and gas recovery applications in porous rock beds where complex microscopic geometries result in mixed flow kinematics with strong shear and extensional components. Experiments with WLM solutions through model microfluidic porous media have revealed a variety of complex flow phenomena, including the formation of stable gel-like structures known as a Flow-Induced Structured Phase (FISP), which undoubtedly play an important role in applications of WLM fluids, but are still poorly understood. A first step in understanding flows of WLM fluids through porous media can be made by examining the flow around a single micro-scale cylinder aligned on the flow axis. Here we study flow behavior of an aqueous WLM solution consisting of cationic surfactant cetyltrimethylammonium bromide (CTAB) and a stable hydrotropic salt 3-hydroxy naphthalene-2-carboxylate (SHNC) in microfluidic devices with three different cylinder blockage ratios, β. We observe a rich sequence of flow instabilities depending on β as the Weissenberg number (Wi) is increased to large values while the Reynolds number (Re) remains low. Instabilities upstream of the cylinder are associated with high stresses in fluid that accelerates into the narrow gap between the cylinder and the channel wall; vortex growth upstream is reminiscent of that seen in microfluidic contraction geometries. Instability downstream of the cylinder is associated with stresses generated at the trailing stagnation point and the resulting flow modification in the wake, coupled with the onset of time-dependent flow upstream and the asymmetric division of flow around the cylinder.

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Section: Rheological Characterizationssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Flow of wormlike micellar solutions around confined microfluidic cylinders

2016

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“…According to literature [38,39], it can be due to the interactions between the WLMs opposing their alignment induced by the strain. For instance, similar maximum was obtained for CTAB micelles with embedded hydrotrope ions [39]. This was attributed to the formation of connections between WLMs as a result of penetration of hydrotrope into two neighboring micellar chains.…”

Section: Viscoelasticity Of Wlm Network With Embedded Nanoclay Partimentioning

confidence: 99%

Injectable ultra-soft hydrogel with natural nanoclay

Молчанов¹,

Efremova²,

Kiseleva³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Soft hydrogels based on a transient network of wormlike surfactant micelles containing bentonite nanoclay tactoids as physical cross-links were developed. The network was composed of mixed micelles of nontoxic zwitterionic surfactant oleylamidopropyldimethylcarboxybetaine and an anionic surfactant sodium dodecyl sulfate. It was demonstrated that before nanoclay addition the solution has pronounced viscoelastic properties with zero-shear viscosity of 100 Pa s and plateau modulus around 7 Pa, which were attributed to the formation of an entangled micellar network. The solution demonstrated pronounced shear thinning behavior provided by the elongation of wormlike micellar chains in flow direction. Upon addition of non-exfoliated nanoclay particles, the zero-shear viscosity increases by an order of magnitude, while the useful property of shear-induced thinning is retained. Oscillation amplitude tests show that viscoelastic fluid becomes hydrogel upon addition of nanoclay, because elastic response was observed even at large stress amplitudes. This behavior was attributed to the formation of nanoclaywormlike micelles junctions. Prepared soft hydrogel is a promising candidate for injection applications, because of its self-assembled structure providing pronounced shear-thinning behavior and fast recovery of rheological properties at rest. In this nanocomposite material, nanoclay tactoids strengthen the hydrogels and can serve as reservoirs for the delivery of various substances.

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“…and Zhao et al (2015) stated that when temperature increases, the salt ions desorb from the micelles leading to a decline in surface charge and a promotion in viscoelasticity. Moreover, at high salinities, thermo-induced thickening behavior due to hydrogen bonding and thermal stability of the viscoelastic solution could increase viscosity (Zhang et al 2016).…”

Section: Effect Of Temperaturementioning

confidence: 99%

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

2018

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The basis of this study is to identify the versatility of N,N,N 0 -trimethyl-N 0 -tallow-1,3-diaminopropane (DTTM) surfactant in high saline environments. The surfactant was examined with sodium chloride, NaCl, to understand how triggers such as salt, pH, temperature, and surfactant concentration influences the viscoelastic response of the surfactant solution. The DTTM surfactant and salt (NaCl) concentrations used in steady-state shear viscosity analysis range from 0.2 wt% to 2 wt% and 5 wt% to 25 wt%, respectively. Along with DTTM results, three similar chemical structures are investigated to understand how viscosity changes with alterations in tail and head group composition. It was found that DTTM surfactant has the capability of transitioning from a foam-bearing to viscoelastic state at low surfactant concentrations under moderate to high saline conditions. A longer tail length promotes viscoelasticity and shear-thinning behavior. Terminals consisting of hydroxides or ethoxylates have a lower viscosity than that of methyl terminals. A head group consisting of two nitrogen atoms has a higher viscosity than those containing one nitrogen atom. The rheological characterization of DTTM presented in this paper is part of a larger study in determining the capability of this surfactant to foam CO 2 for improving mobility control in CO 2 enhanced oil recovery in high saline oil formations.

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Rheological characterizations of wormlike micellar solutions containing cationic surfactant and anionic hydrotropic salt

Cited by 34 publications

References 138 publications

Flow of wormlike micellar solutions around confined microfluidic cylinders

Flow of wormlike micellar solutions around confined microfluidic cylinders

Injectable ultra-soft hydrogel with natural nanoclay

A systematic rheological study of alkyl amine surfactants for fluid mobility control in hydrocarbon reservoirs

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