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

Shrestha, Rekha Goswami; Rodríguez‐Abreu, Carlos; Aramaki, Kenji

doi:10.5650/jos.58.243

Cited by 25 publications

(22 citation statements)

References 39 publications

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“…For example, the quaternary ammonium surfactant cetyltrimethylammonium bromide (CTAB) bears a permanently positive headgroup, and therefore the self-assembly of the CTAB is highly dependent on the intrinsic geometry of the surfactant without being critically affected. [ 27 ] The self-assembly of anionic surfactants is dependent on the electrostatic repulsive interactions between the headgroups, as proved by the effect of the counterions or co-surfactants, [45][46][47][48][49][50][51] and this could be manipulated by controlling the ionization degree of the surfactant. When the ionization degree is high, anionic surfactants are highly charged and self-assemble into globular micelles, having a high hydrophobic/hydrophilic interface curvature.…”

Section: Control Of Organic/inorganic Interface Curvature By Ionizatimentioning

confidence: 99%

Organically Functionalized Mesoporous Silica by Co‐structure‐Directing Route

Gao

Che

2010

Adv Funct Materials

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This article provides a brief overview of functional mesoporous silica materials synthesized by the co‐structure‐directing route, which is distinct from conventional synthesis strategies. In these systems, organosilane serves as the co‐structure‐directing agent (CSDA), which provides critical interactions between the template and organic part of the organosilane to form mesostructures, thus retaining the organic groups on the pore surface after removal of the template by extraction. i) The formation of anionic‐surfactant‐templated mesoporous silicas (AMSs) has been achieved by the co‐structure‐directing route, which leads to a variety of mesostructures, porous properties and morphologies. ii) Other co‐structure‐directing systems for synthesizing mesoporous silicas have also been achieved, including systems using cationic surfactants and non‐surfactants, and systems using DNA for constructing nanofibers and DNA–silica liquid crystalline complexes. iii) Evidence for the regular arrangement of functional groups on the pore surface resulted from the co‐structure‐directing effect has been discussed. Also included is a brief description of the application, future requirements, and trends in the development of mesoporous materials by the co‐structure‐directing route.

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Section: Control Of Organic/inorganic Interface Curvature By Ionizatimentioning

confidence: 99%

Organically Functionalized Mesoporous Silica by Co‐structure‐Directing Route

Gao

Che

2010

Adv Funct Materials

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“…molecules self-structure into spherical micelle, which may grow into cylinder or wormlike (entangled networks) under a certain condition of temperature, composition, salinity, or addition of cosurfactants. [5][6][7][8][9] In the recent years fabrication of smart nanomaterials via reverse micelles templating have grown up tremendously [10][11][12][13][14][15][16][17][18] in which reverse micelles have been utilized as a nanoreactor for materials synthesis. As a matter of fact that the structure of micelles determines the structure of the materials 19 20 in depth knowledge of free structure control of reverse micelles is essentially required in the material synthesis.…”

Section: Introductionmentioning

confidence: 99%

Reverse Micelle Microstructural Transformations Induced by Surfactant Molecular Structure, Concentration, and Temperature

Shrestha

Ariga

et al. 2011

J. Nanosci. Nanotech.

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We have investigated the microstructural transformations of nonionic surfactant reverse micelles induced by surfactant molecular architecture, surfactant concentration, and temperature in nonaqueous media. The investigations were based on small-angle X-ray scattering (SAXS) and rheometry techniques. Polyglycerol polyoleic acid esters spontaneously self-assembled into reverse micelle in n-decane under ambient conditions, whose shape, size, and internal structure could be controlled by the surfactant molecular architecture, concentration, and temperature. The maximum size of the micelles was found to increase with an increase in the hydrophilic headgroup size of the surfactant. On the other hand, an opposite trend was observed with an increase in the number of oleate chain per surfactant molecules, which was well supported by rheology data; viscosity decreased with the number of oleate chain per surfactant molecule. The SAXS and rheology data have shown a clear evidence of one dimensional micellar growth with increase in the surfactant concentration. The relative viscosity, eta(r), of the reverse micelle exhibited steeper concentration dependence behavior than those predicted for a dispersion of spherical particles based on the Krieger-Dougherty relation which provided a clear evidence of the presence of elongated micelles at higher concentration. An ellipsoidal prolate-to-sphere type transition was observed upon heating.

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“…37,38 However, and in spite of the huge amount of experimental data, it is still difficult to clearly explain the ionspecific effects, mainly because they simultaneously result from several interactions such as dielectric, steric, and dispersion forces, and also from specific hydration of ions at interfaces. 39 It is noteworthy that recently, Shrestha et al 40 reported that the linear viscoelastic properties of wormlike micelles composed of mixed amino acid surfactant/nonionic surfactant follow the Hofmeister series. Fig.…”

Section: à4mentioning

confidence: 99%

Effect of ionic strength on rheological behavior of polymer-like cetyltrimethylammonium tosylate micellar solutions

et al. 2011

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The influence of ionic strength on the rheological properties of polymer-like aqueous micellar solutions of cetyltrimethylammonium tosylate (CTAT) containing different salts (KCl, KBr, (COONa) 2 , K 2 SO 4 or K 3 PO 4 ) is investigated. The rheological behavior of the solutions is analyzed above the concentration where a micellar entanglement network is formed, varying surfactant and salt concentration, salt counterion valency and temperature. A master curve of the linear viscoelastic properties is obtained by multiple superposition of time, temperature, salt type, and surfactant and salt concentration. Application of the existent kinetic theory provides information suggesting that the micellar solutions are in the fast breaking regime (i.e., the relaxation is kinetically controlled) regardless of salt type and concentration. Moreover, these solutions exhibit shear-banding flow with a reduced stress plateau (s/G 0 , being s and G 0 the shear stress and the plateau modulus, respectively) that increases with salt content and counterion valency. The zero-shear viscosity (h 0 ) and the main relaxation time (s C ) diminish with increasing salt content according to a step-like function, in which the number of steps increases with the salt counterion valence. In contrast, G 0 only increases slightly with increasing salt content for the five salts employed. These results are discussed in terms of ionic strength and screening of the electrostatic-interactions caused by the addition of salt. In addition, it was found that the influence of anions on the viscoelastic properties of the polymer-like micelles follows the Hofmeister series commonly encountered in macromolecular and biological systems. This finding opens a challenge for scientists in the experimental and theoretical fields.

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

Cited by 25 publications

References 39 publications

Organically Functionalized Mesoporous Silica by Co‐structure‐Directing Route

Organically Functionalized Mesoporous Silica by Co‐structure‐Directing Route

Reverse Micelle Microstructural Transformations Induced by Surfactant Molecular Structure, Concentration, and Temperature

Effect of ionic strength on rheological behavior of polymer-like cetyltrimethylammonium tosylate micellar solutions

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