Wormlike micelles and microemulsions in aqueous mixtures of sucrose esters and nonionic cosurfactants

Rodríguez‐Abreu, Carlos; Aramaki, Kenji; Tanaka, Yusuke; López‐Quintela, M. Arturo; Ishitobi, Masahiko; Kunieda, H.

doi:10.1016/j.jcis.2005.05.018

Cited by 60 publications

(33 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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

et al. 2010

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…aggregation numbers of 161 were reported for sucrose hexadecanoate (C 16 SE)/cosurfactant/water systems in the presence of solubilized oil. 39 In contrast, anionic SDS micelles have an aggregation number between 60-70 40 and Brij-35, a polyoxyethylene lauryl ether has an aggregation number of approximately 40. 41 Fitzgerald and coworkers confirmed formation of spherical micelles in Gemini nonionic surfactants with ethoxylated chain lengths similar to ones used in this study with aggregation numbers ranging from 27 to 56 depending on the length of the alkyl and polyoxyethylene groups of the surfactants which is in good agreement with n=53 and n= 32 calculated for Surfynol® 465 and 485W, respectively.…”

Section: Discussionmentioning

confidence: 99%

Formulation and Characterization of Phytophenol-Carrying Antimicrobial Microemulsions

et al. 2007

View full text Add to dashboard Cite

Phytophenols were solubilized in nonionic surfactant micelles to form antimicrobially active and thermodynamically stable microemulsions. Formulation of phytophenols in microemulsions has previously been shown to improve their antimicrobial activity in model microbiological and food systems. Carvacrol and eugenol were incorporated in micellar solutions of two nonionic surfactants (Surfynol® 485W and Surfynol® 465) by mixing at room temperature. Particle size of formed microemulsions was determined by dynamic light scattering, and structural information about the mixed micellar system was obtained by nuclear magnetic resonance spectroscopy (NMR). Uptake of carvacrol and eugenol in surfactant micelles as determined by ultrasonic velocity measurements was very rapid, e.g., below the maximum additive concentration, the phytophenols were completely solubilized in the micelles in less than 30 min. Depending on the surfactant-phytophenol combination, the self-assembled surfactant-phytophenol aggregates had mean particle diameters between 3 and 17 nm. Elucidation of the structure of aggregates by 1H NMR studies indicated that micelles had a "bracket-like" structure with phytophenols being located inside the palisade layer of the micelle in direct contact with adjacent surfactant monomers. Encapsulation of phytophenols in surfactant micelles enables the incorporation of large amounts of hydrophobic antimicrobials in aqueous phases. Formulation of antimicrobial microemulsions may thus offer a means to deliver high concentrations of phytophenols to the bacterial surfaces of foodborne pathogens to affect kill.

show abstract

“…The formation of end caps in the cylindrical aggregates becomes unfavorable with increasing temperature because of high free-energy cost of the formation of hemispherical ends, and consequently one-dimensional growth is favored. However, at high temperatures, due to a decrease in solubility, a migration of C 14 EO 3 molecules towards the micellar core cannot be ruled out, which would contribute to the disruption of the long micelles 42) .…”

Section: Thermoresponsive Behaviormentioning

confidence: 99%

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Shrestha¹,

Rodríguez‐Abreu²,

Aramaki³

2009

J. Oleo Sci.

Self Cite

View full text Add to dashboard Cite

Wormlike micelles and microemulsions in aqueous mixtures of sucrose esters and nonionic cosurfactants

Cited by 60 publications

References 36 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

Formulation and Characterization of Phytophenol-Carrying Antimicrobial Microemulsions

Wormlike Micelles in Mixed Amino Acid Surfactant/Nonionic Surfactant Aqueous Systems and the Effect of Added Electrolytes

Contact Info

Product

Resources

About