Effect of Added Poly(oxyethylene)dodecyl Ether on the Phase and Rheological Behavior of Wormlike Micelles in Aqueous SDS Solutions

Acharya, Durga P.; Sato, Takaaki; Kaneko, Masaya; Singh, Yashveer; Kunieda, H.

doi:10.1021/jp054631x

Cited by 85 publications

(78 citation statements)

References 27 publications

(56 reference statements)

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“…The h 0 value of the aqueous CGT-n solution (at X=0) is almost same level as found for pure water. With the increase in X, h 0 increases dramatically above a certain value of X, which is usually observed in the systems of worm-like micellar solution 22,[25][26][27][29][30][31] . At n=1.5 and 2 for 10wt% of total surfactant concentration, h 0 reaches to a maximum value at X=0.5 and X=0.6, respectively.…”

Section: Phase Behavior Of Water/cgs-n and Water/cgt-n Systemsmentioning

confidence: 71%

“…Conventional surfactants such as CTAB or SDS are available for the hydrophilic surfactant. For hydrophobic cosurfactants, poly (oxyethylene) alkyl ethers, alkanolamides, glycerol monoalkanoates and middle-or long-chain alcohols with various hydrocarbon chain lengths can be used [22][23][24][25][26][27][28][29][30][31][32][33] . The variety of the choice of those surfactants allows controlling the viscosity of demanded surfactant aqueous solution systems and offers possible applications for such as shampoos, conditioners, and so on.…”

Section: Introductionmentioning

confidence: 99%

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Composition-Insensitive Highly Viscous Wormlike Micellar Solutions Formed in Anionic and Cationic Surfactant Systems

et al. 2010

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We investigated phase behavior and rheological properties of aqueous micellar phase formed in water/cocoyl glutamate neutralized with triethanol amine (CGT-n)/hexadecyl trimethylammonium salt (CTAB or CTAC) systems, where n is a degree of neutralization. Micellar phase appears in wide composition range with respect to the surfactant mixing fraction in ternary phase diagrams at 25˚C. At high mixing fraction of cationic surfactant in the water/CGT-n/CTAB systems, one can observe a highly viscous micellar phase in which worm-like micelles are expected to form. Contrary to conventional systems in which worm-like micelles are formed, the zero-shear viscosity of the micellar solution in the water/CGTn/CTAB system with n=1.2 increases with the addition of cationic cosurfactant and once decreases after a maximum, then increases again and decreases after the second maximum. At n=1.5 and 2, highly viscous solution is observed in the relatively wide range of surfactant mixing fraction instead of two maxima of the viscosity curve observed at n=1.2. In the case of CTAC instead of CTAB we can observe narrow composition range for the maximum viscosity. Frequency sweep measurements were performed on the highly viscous samples in the water/CGT-1.5/CTAB system. Typical viscoelastic behavior of worm-like micellar solutions is observed; i.e. the curves of storage (G') and loss (G") moduli make a crossover and the data points of G' and G" can be fitted to the Maxwell model. Relaxation time against the mixing fraction of two surfactants behaves similarly to the zero-shear viscosity change, whereas the plateau modulus continuously increases in the plateau region for the zero-shear viscosity curve.

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Section: Phase Behavior Of Water/cgs-n and Water/cgt-n Systemsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Composition-Insensitive Highly Viscous Wormlike Micellar Solutions Formed in Anionic and Cationic Surfactant Systems

et al. 2010

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“…Understanding the rheological properties of the mixed-surfactant aqueous solutions is essential for practical applications and, thus, there have been many studies on this issue (Mu et al, 2002). However, as far as we know, there are only a few studies which focus on the relationship between rheology and micellar structure (Acharya et al, 2006). This paper presents synchrotron small-angle X-ray scattering (SAXS) results for LES/AMPB dual-component aqueous solutions and explores the micellar structures and inter-micellar interactions as a function of the salt and surfactant concentrations.…”

Section: Introductionmentioning

confidence: 99%

Salt-concentration dependence of the structure and form factors for the wormlike micelle made from a dual surfactant in aqueous solutions

Eguchi

Kaneda²,

Hiwatari³

et al. 2007

J Appl Cryst

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Small-angle X-ray scattering (SAXS) from dual-surfactant aqueous solutions made from sodium lauryl ether sulfate and coconut fatty acid amido propyl betaine was systematically measured as a function of the net sodium cation concentration, [Na + ]*, and the surfactant concentration, C D . The SAXS intensity [I(q)] was normalized to C D and the resultant I(q)/C D was extrapolated to C D = 0 to give a form factor P(q) for each [Na + ]* [where q = 4 sin( /2)/ is the magnitude of the scattering vector, is the wavelength and 2 is the scattering angle]. The low-q behaviour of P(q) was consistent with long rigid cylinders. The middle-and high-q profiles fitted well with a core-shell cylinder model for all [Na + ]*. The core and total radii (R c and R s ) did not depend on [Na + ]* at all: R c = 1.2 AE 0.05 and R s = 3.1 AE 0.05 nm for [Na + ]* = 0.42-1.5 mol l À1 , indicating that the salt concentration changes did not induce any structural changes and reassembling of the surfactants comprising the micelles. This fact is in contrast to the rheological behaviour where the relaxation mode strongly depends on [Na + ]*. The structure factor [S(q)] was obtained by dividing I(q)/C D by P(q) for each C D and the mean distance (d m ) between the micelles was obtained from the first maximum of S(q) versus q plots. The d m value decreased with increasing C D and [Na + ]*, which is in good agreement with the theoretical prediction and experimental results for charged wormlike micelle solutions.

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“…14) On the other hand, micelle structures of surfactants depend on the conditions such as temperature and solution compositions. In the system with SDS, transition of micelle structure from spherical to rod or wormlike is frequently observed by adding various components, such as cationic surfactants, 15) neutral surfactants with ethylene oxide chain, 16) organic salts, 17),18) urea 19) and inorganic aluminum nitrate salt, 20) in aqueous solution of SDS. Such change occurs as a result of modification of hydrophilic characters of SDS by the additives.…”

Section: Micelle Structures Of Sodium Dodecyl Sulfate In Aqueous Solumentioning

confidence: 99%

Phase separation in the system with sodium silicate and sodium dodecyl sulfate under acidic conditions

Takahashi

Sato

Kojima

et al. 2010

J. Ceram. Soc. Japan

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Phase separation in an acidic aqueous solution with sodium silicate and sodium dodecyl sulfate (SDS) was investigated. The solution separated into silica-rich and SDS-rich phases during condensation of silica components. During the phase separation, the transition structure was fixed by gelation, resulting in mutually continuous morphology. The addition of a small amount of water-miscible organic solvents, such as methanol, ethanol, 1-propanol, and 1-butanol, into the reacting solution greatly decreases both viscosity and phase separation tendency of the solution. In the system with high concentration of strong acid, SDS molecules form wormlike micelles, which not only increase viscosity of the solution but also play an important role in the phase separation in the solution because the formation of wormlike micelles increases apparent molecular weight of SDS and decreases mixing entropy. The decrease in the viscosity by the addition of organic solvents suggests that wormlike micelles become small in the presence of organic solvent molecules. Consequently, the addition of appropriate amount of organic solvent is effective for controlling phase separation tendency and size of the resulted macropores in the system with SDS through the change in the structure of the micelles.

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Effect of Added Poly(oxyethylene)dodecyl Ether on the Phase and Rheological Behavior of Wormlike Micelles in Aqueous SDS Solutions

Cited by 85 publications

References 27 publications

Composition-Insensitive Highly Viscous Wormlike Micellar Solutions Formed in Anionic and Cationic Surfactant Systems

Composition-Insensitive Highly Viscous Wormlike Micellar Solutions Formed in Anionic and Cationic Surfactant Systems

Salt-concentration dependence of the structure and form factors for the wormlike micelle made from a dual surfactant in aqueous solutions

Phase separation in the system with sodium silicate and sodium dodecyl sulfate under acidic conditions

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