Light scattering investigations of the behavior of semidilute aqueous micellar solutions of cetyltrimethylammonium bromide: Analogy with semidilute polymer solutions

Candau, S. J.; Hirsch, Ernest; Zana, R.

doi:10.1016/0021-9797(85)90327-3

Cited by 167 publications

(102 citation statements)

References 37 publications

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“…Upon further increasing the concentrations of Na 2 CO 3 and OTAB, the viscosity is increased rapidly and a maximum viscosity is reached at [Na 2 CO 3 ]=2.54 wt.% and [OTAB]=1.2 wt.% for the NaOA/Na 2 CO 3 and NaOA/OTAB systems, respectively. Such a rapid growth in viscosity can be attributed to the long and entangled wormlike micelles formation, which is commonly observed in similar wormlike micelle systems [16,27,28]. However, further increasing [Na 2 CO 3 ] and [OTAB] would result in the viscosity decrease, because excessive salt could adsorb on the micelle surface and reduce the net charge of wormlike micelles, which might cause wormlike micelles becoming huddled [27][28][29].…”

Section: Effects Of Inorganic and Organic Additivesmentioning

confidence: 94%

“…Such a rapid growth in viscosity can be attributed to the long and entangled wormlike micelles formation, which is commonly observed in similar wormlike micelle systems [16,27,28]. However, further increasing [Na 2 CO 3 ] and [OTAB] would result in the viscosity decrease, because excessive salt could adsorb on the micelle surface and reduce the net charge of wormlike micelles, which might cause wormlike micelles becoming huddled [27][28][29]. Thus, the wormlike micelles would undergo a transition from linear to branched threefold junctions [1,11].…”

Section: Effects Of Inorganic and Organic Additivesmentioning

confidence: 98%

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Nanoparticles induced micellar growth in sodium oleate wormlike micelles solutions

Fan

Li²,

Zhang³

et al. 2015

Colloid Polym Sci

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The rheological behavior of anionic surfactant sodium oleate (NaOA) in the presence of inorganic salt of sodiu m c a r b o n a t e ( N a 2 C O 3 ) , o r g a n i c s a l t o f nOctyltrimethylammonium bromide (OTAB) and nano-sized silica particles (nano SiO 2 ) was studied in detail. Regardless of the surfactant concentration (NaOA), OTAB was stronger than that of Na 2 CO 3 in promoting the rapid growth of NaOA micelles, resulting in higher viscosity of NaOA aqueous solutions. It was found that nano SiO 2 nearly not affects solution viscosity in the NaOA/Na 2 CO 3 system. However, results of NaOA/OTAB system in the presence of nano SiO 2 show that nano SiO 2 promoted wormlike micelles formation and enhanced the bulk viscosity. Simultaneously, the presence of nano SiO 2 also facilitated the branched wormlike micelles formation as confirmed by viscosity and cryo-TEM measurements because of the electrostatic interactions between wormlike micelles and nano SiO 2 .

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Section: Effects Of Inorganic and Organic Additivesmentioning

confidence: 94%

Section: Effects Of Inorganic and Organic Additivesmentioning

confidence: 98%

Nanoparticles induced micellar growth in sodium oleate wormlike micelles solutions

Fan

Li²,

Zhang³

et al. 2015

Colloid Polym Sci

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“…7 However, unlike covalent chemical bonding polymers, self-assembled wormlike micelles are in dynamic equilibrium with their monomers, which are called "living polymers" owing to their ability to break and recombine rapidly. 8,9 The viscoelastic wormlike micelles often show relaxation behavior that can be described by a Maxwell model with a single relaxation time, a living polymer model proposed by Cates et al 9À11 Viscoelastic wormlike micelles formed by ionic surfactants, especially cationic surfactants, upon addition of various additives have been studied extensively. 12À18 The additives are either simple inorganic salts or structure-forming benzyl hydrotropes, with the molar ratio of salt to surfactant typically above 1 for the former while much lower for the latter.…”

mentioning

confidence: 99%

A Dually Effective Inorganic Salt at Inducing Obvious Viscoelastic Behavior of both Cationic and Anionic Surfactant Solutions

Xia

Wang

et al. 2011

Langmuir

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Viscoelasticity, induced by the entanglement of wormlike or threadlike micelles, has been observed in various surfactant systems and drawn considerable interest in both fundamental and applied science owing to the systems' special rheological properties. 1À6 The rheology of these viscoelastic surfactant fluids is similar to that of the solutions of flexible polymers. 7 However, unlike covalent chemical bonding polymers, self-assembled wormlike micelles are in dynamic equilibrium with their monomers, which are called "living polymers" owing to their ability to break and recombine rapidly. 8,9 The viscoelastic wormlike micelles often show relaxation behavior that can be described by a Maxwell model with a single relaxation time, a living polymer model proposed by Cates et al. 9À11 Viscoelastic wormlike micelles formed by ionic surfactants, especially cationic surfactants, upon addition of various additives have been studied extensively. 12À18 The additives are either simple inorganic salts or structure-forming benzyl hydrotropes, with the molar ratio of salt to surfactant typically above 1 for the former while much lower for the latter. The most interesting features of wormlike micellar solutions are their fascinating microstructural evolution and their linear and nonlinear viscoelastic behavior, depending on the interaction between the surfactant and additive molecules. Inorganic counterions (e.g., F À , Cl À , Br À , NO 3 À ) bind moderately to cationic micelles and thus lead to gradual micellar growth by screening the repulsion between the charged headgroups, 19À22 but for the same charged surfactants, i.e., anionic surfactants, the inorganic salts only play a role in regulating the ionic strength of the solutions. 23 Moreover, at high concentrations of surfactant and salt, phase separation often occurs due to the formation of precipitate, which is generally called the salting-out effect. 24À26 Compared with inorganic salts, organic counterions or hydrotropic salts that strongly bind to the micellar surface are highly efficient in promoting micellar growth 16,22,27 and inducing wormlike micelles at a significantly low ratio of salt to surfactant. However, similar to inorganic salts, only the oppositely charged hydrotropic salts can induce such microstructure transition and viscoelastic behavior in surfactant systems. On the whole, these additives induce complicated viscoelastic responses which are strongly dependent on the electric properties of the additives, and only the oppositely charged additives can show strong interaction with the surfactants, regardless of whether they are inorganic salts or hydrotropic salts.Although simple additive effects for ionic surfactants have been studied extensively, there are few reports of the abovementioned effects induced only by one salt for both cationic and anionic surfactants. It is believed that the present study is the first example that inorganic salt induces micellar growth and viscoelastic behavior significantly in both cationic and anionic surfactant soluti...

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“…Although micelles are usually spherical in shape, under certain conditions, e.g., concentration, salinity or in the presence of hydrophobic counter ions, etc., they may undergo uniaxial growth. This subsequently results in the formation of significantly long (100 -500 µm) yet highly flexible aggregates referred to as 1* Prof. Swapan K. Saha, (March 22-23, 2014) Biratnagar, Nepal "worm-like micelles (WLM)" [4][5][6]. The research of WLM has drawn considerable interest as its rheology is very challenging due to the presence of multiple pertinent length scales and stress relaxation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Weak interactions-Strong effects: Key role of hydrophobic interaction in the formation of stimuli-responsive viscoelastic gel of worm-like micelles

Saha

2014

BIBECHANA

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Among all the weak interactions, which are operative in the domain of chemistry, hydrophobic effect is one that leads to new structural motifs like molecular self-assemblies viz., micelles, vesicles etc. Worm-like micelles are polymer like aggregates which have been formed in aqueous surfactant solutions in the presence of additives. These are relatively new materials with exciting material properties. These stimuli-responsive viscoelastic materials are interesting from both fundamental understanding as well as application points of view. The physico-chemical properties of worm-like micelles are studied and the morphological transitions to vesicle as functions of various parameters have been investigated.

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Light scattering investigations of the behavior of semidilute aqueous micellar solutions of cetyltrimethylammonium bromide: Analogy with semidilute polymer solutions

Cited by 167 publications

References 37 publications

Nanoparticles induced micellar growth in sodium oleate wormlike micelles solutions

Nanoparticles induced micellar growth in sodium oleate wormlike micelles solutions

A Dually Effective Inorganic Salt at Inducing Obvious Viscoelastic Behavior of both Cationic and Anionic Surfactant Solutions

Weak interactions-Strong effects: Key role of hydrophobic interaction in the formation of stimuli-responsive viscoelastic gel of worm-like micelles

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