Micellar chain model for the origin of the visoelasticity in dilute surfactant solutions

Rao, U. R. K.; Manohar, C.; Valaulikar, B. S.; Iyer, R.M.

doi:10.1021/j100296a036

Cited by 187 publications

(186 citation statements)

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“…A similar increase in viscosity is observed with addition of KCl, KBr or NaCl with five times higher concentration [12]. The mechanism responsible for this large change in viscosity is expected to be different in two cases [13,14]. Like all other surfactants CTAB also shows a rapid change in viscosity when the physical and chemical compositions of the solution are changed.…”

Section: Introductionsupporting

confidence: 52%

Determination of critical micelle concentration of cetyltrimethylammonium bromide in presence and absence of KCl and NaCl in aqueous media at room temperature by viscosity measurement

2014

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Viscosity measurement of cetyltrimethylammonium bromide in presence and in absence of KCl and NaCl in aqueous media is done. The results showed a sharp increase in viscosity with increase in concentration of cetyltrimethylammonium bromide. Also, the viscosity increases with addition of salts. The viscosity of cetyltrimethylammonium bromide is found more in presence of KCl than NaCl in aqueous media. In presence of monovalent salts, the critical micelle concentration (cmc) value decreases which is explained on the basis of nature and ionic strength of the added ion. The graphs of viscosity versus concentration are used in determining the critical micelle concentration (cmc).

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Section: Introductionsupporting

confidence: 52%

Determination of critical micelle concentration of cetyltrimethylammonium bromide in presence and absence of KCl and NaCl in aqueous media at room temperature by viscosity measurement

2014

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“…The aqueous solution exhibited similar phase behavior and viscoelasticity as those in the mixture of CTAB/NaSal, which remains aqueous in a wide range of salt concentrations [Brown et al (1989); Hartmann and Cressely (1997); Shikata et al (1987)]. It was proposed that the combination of the naphthalene structure and the strong hydrophobicity of HNC À was responsible for the unique phase behavior in SHNC-cationic surfactant mixtures [Abdel-Rahem (2008); Rao et al (1987)]. …”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Haward

Shen

2015

Journal of Rheology

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Determination of characteristic lengths and times for wormlike micelle solutions from rheology using a mesoscopic simulation method Journal of Rheology 59, 903 (2015) AbstractAqueous micellar solutions of cationic surfactant cetyltrimethylammonium bromide (CTAB) and organic hydrotropic salt 3-hydroxy naphthalene-2-carboxylate (SHNC) in the semidilute regime have been characterized by linear and nonlinear rheology, and dynamic light scattering. The strong hydrophobicity and naphthalene structure present in the SHNC induces significant growth of CTAB wormlike micelles and promotes stable micellar network formation. Focusing primarily on 75 mM CTAB/SHNC solution, we correlate the rich rheological behavior with structural transitions of the micellar network under different deformation histories with temperatures in the range of 20 C < T < 40 C. Viscous dissipation dominates at low temperature, while short range interactions among micellar head groups, reorganization of micellar networks play important roles at higher temperatures, leading to complex stress responses under large deformations. The influence of double benzene rings on the response of transient and large amplitude oscillatory shear flows in the system was further elucidated by comparing the rheological behavior of CTAB/SHNC with CTAB/NaSal at the same salt and surfactant concentrations. Our studies distinguished SHNC as a stable hydrotrope in a semidilute cationic surfactant system under thermal variations, with potential applications such as drag reduction and fracturing fluids in oil recovery.

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“…An important parameter is the orientation of the counterion at the micellar surface. A correlation was suggested (35) between this orientation and the worm-inducing efficiency.…”

Section: Counterions Which Are Able To Induce Viscoelasticity In Surfmentioning

confidence: 91%

Effect of Counterion Structure on Micellar Growth of Alkylpyridinium Surfactants in Aqueous Solution

Bijma

Rank

Engberts³

1998

Journal of Colloid and Interface Science

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Effect of counterion structure on micellar growth of alkylpyridinium surfactants in aqueous solution Bijma, K; Rank, E.; Engberts, J.B.F.N. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. This paper describes the influence of counterions on the unidirectional growth of micelles formed by alkylpyridinium surfactants in aqueous solution. It is shown that the growth of spherical micelles to form wormlike micelles is strongly dependent on counterion structure. More hydrophobic counterions induce the formation of wormlike micelles at lower surfactant concentrations. Next to hydrophobicity and the type of substituent, the substitution pattern of the aromatic ring plays the most important role in micellar growth. The formation of a network of entangled, elongated wormlike micelles by alkylpyridinium surfactants with o-hydroxybenzoate and p-chlorobenzoate counterions is discussed in terms of surfactant structure. It is concluded that, next to counterion structure, the microenvironment of the counterion (substituent) in the Stern region and the structure of the surfactant monomer (i.e., the surfactant cation) play the most important role in the formation of these elongated wormlike micelles. Headgroup effects are proposed to be the main driving force for this phenomenon.

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Micellar chain model for the origin of the visoelasticity in dilute surfactant solutions

Cited by 187 publications

References 0 publications

Determination of critical micelle concentration of cetyltrimethylammonium bromide in presence and absence of KCl and NaCl in aqueous media at room temperature by viscosity measurement

Determination of critical micelle concentration of cetyltrimethylammonium bromide in presence and absence of KCl and NaCl in aqueous media at room temperature by viscosity measurement

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

Effect of Counterion Structure on Micellar Growth of Alkylpyridinium Surfactants in Aqueous Solution

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