Rheological behavior of mixed system of ionic liquid [C<sub>8</sub>mim]Br and sodium oleate in water

doi:10.1007/s11705-015-1511-9

Front. Chem. Sci. Eng.

2015, Vol. 9

Issue (2) : 232-241 https://doi.org/10.1007/s11705-015-1511-9

RESEARCH ARTICLE

Rheological behavior of mixed system of ionic liquid [C₈mim]Br and sodium oleate in water

Zimeng HE,Ling YUE,Meng LI,Yazhuo SHANG(

),Honglai LIU

State Key Laboratory of Chemical Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China

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Abstract

We report on the rheological behavior of wormlike micelles constructed by ionic liquid surfactant [C₈mim]Br (1-octyl-3-methylimidazolium bromide) and anionic surfactant sodium oleate (NaOA) in aqueous solution. The effects of surfactant composition, total surfactant concentration, added salts, and temperature were investigated. The prevailing surfactant effect at lower concentration and the leading cosolvent effect at higher concentration of [C₈mim]Br may be the main reasons for appearance of well-established maximum in key rheological parameters with variation of surfactant composition and total surfactant concentration. The Cole-Cole plots demonstrate that the systems (total surfactant concentration falls within 0.17–0.35 mol·L^-1 and molar ratio 0.33≤R≤0.50) fit the Maxwell’s mechanical model as linear viscoelastic fluid. The addition of NaBr or sodium salicylate decreases significantly the viscosity and the relaxation time of the wormlike micelle solution but cannot change the value of plateau modulus G₀. The present system has low rheological tolerance to temperature. The increase of temperature decreases the average contour length and viscosity of wormlike micelles and thus strengthens the relaxation progress of diffusion and weakens the relaxation progress of reptation. Increasing the temperature also decreases the value of plateau modulus G₀ and shifts the minimum value of the loss modulus G^″_min to higher frequencies.

Keywords rheological behavior ionic liquid surfactant sodium oleate wormlike micelles viscoelasticity

Corresponding Author(s): Yazhuo SHANG

Online First Date: 26 May 2015 Issue Date: 14 July 2015

Cite this article:

Zimeng HE,Ling YUE,Meng LI, et al. Rheological behavior of mixed system of ionic liquid [C₈mim]Br and sodium oleate in water[J]. Front. Chem. Sci. Eng., 2015, 9(2): 232-241.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-015-1511-9
https://academic.hep.com.cn/fcse/EN/Y2015/V9/I2/232

Fig.1 Chemical structures of NaOA and [C₈mim]Br

(A) NaOA (B) [C8mim]Br

Fig.2 Steady rheological behaviors for [C₈mim]Br/NaOA aqueous solutions. (A) The molar ratio of [C₈mim]Br to NaOA is varied from 0.10 to 0.80. The insert shows the zero-shear viscosity as a function of [C₈mim]Br/NaOA ratio (the lines are simply to guide the eye). (B) Steady rheological behaviors for pure NaOA, and pure [C₈mim]Br as well as the mixed systems with different molar ratios (0.10, 0.60, 0.80). The total surfactant concentration is kept constant at 0.2 mol·L^-1 (40 °C).

Fig.3 Effect of varying the ratio of [C₈mim]Br to NaOA on the dynamic frequency response. The total surfactant concentration is kept constant at 0.2 mol·L^-1 (40 °C). Storage modulus G′ are shown by open symbols; loss modulus G′′ are shown by filled symbols

Fig.4 Cole-Cole plots for [C₈mim]Br/NaOA solutions with different molar ratios at 40 °C. The total surfactant concentration is kept constant at 0.2 mol·L^-1.

Fig.5 Steady rheological behavior for [C₈mim]Br/NaOA aqueous solutions. Total surfactant concentration is varied from 0.12 to 0.40 mol·L^-1. The insert shows the zero-shear viscosity as a function of total surfactant concentration (The lines are simply to guide the eye). The molar ratio of [C₈mim]Br/NaOA solutions is kept constant at 0.36 (40 °C).

Fig.6 Effect of total surfactant concentration on the dynamic frequency response. The molar ratio of [C₈ mim]Br/NaOA is kept constant at 0.36 (40 °C). Storage modulus G′ are shown by open symbols; loss modulus G′′ are shown by filled symbols

Fig.7 Cole-Cole plots for [C₈ mim]Br/NaOA solutions with different total surfactant concentrations at 40 °C. The molar ratio of [C₈mim]Br/NaOA solutions is kept constant at 0.36

Fig.8 Zero shear viscosity as a function of the concentration of added salts in 0.2 mol·L^-1 [C₈mim]Br/NaOA solutions at 40 °C. The molar ratio of [C₈mim]Br to NaOA was 0.36

Fig.9 Effect of salt concentration (A: NaBr, B: NaSal) on the dynamic frequency spectra of 0.2 mol·L^-1 [C₈mim]Br/NaOA system (R = 0.36, 40 °C). Storage modulus G′ are shown by open symbols; loss modulus G′′ are shown by filled symbols

Fig.10 η₀versus 1/T for the 0.2 mol·L^-1 [C₈mim]Br/NaOA solutions. The molar ratio of [C₈mim]Br to NaOA was 0.36

Fig.11 Steady rheological behavior for 0.2 mol·L^-1 [C₈mim]Br/NaOA solutions at different temperature. The molar ratio of [C₈mim]Br to NaOA was 0.36

Fig.12 Effect of temperature on the dynamic frequency response. The total surfactant concentration is kept constant at 0.2 mol·L^-1. The molar ratio of [C₈mim]Br to NaOA was 0.36. Storage modulus G′ are shown by open symbols; loss modulus G′′ are shown by filled symbols

Fig.13 The ratio of G₀to G m i n ' ' as a function of temperature for 0.2 mol·L^-1 [C₈mim]Br/NaOA solutions. The molar ratio of [C₈mim]Br to NaOA was 0.36.

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