Daily Applications of Systems with Wormlike Micelles

Ezrahi, S.; Aserin, Abraham; Garti, Nissim; Tuval, Eran

doi:10.1201/9781420007121.ch18

Cited by 6 publications

(6 citation statements)

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“…Correspondingly, the breakage time τ br is the shortest for C 12 OH and the longest for C 16 OH, see Eq. (15). The elastic modulus G 0 is also the greatest for C 12 OH and the smallest for C 16 OH.…”

Section: Systems With Standard Rheological Behavior: Numerical Resultsmentioning

confidence: 90%

“…We could attribute this effect to smaller rate constant of breakage, k 1 , in the presence of added salt; see Eq. (15). Indeed, the added salt suppresses the electrostatic repulsion between the surfactant headgroups at the micelle surface, which is charge-charge repulsion for the ionic surfactant and dipole-dipole repulsion for the zwitterionic one.…”

Section: Systems With Standard Rheological Behavior: Numerical Resultsmentioning

confidence: 99%

“…shampoos and liquid detergents), because they allow one to control the micelle growth and formulation's viscosity [13][14][15]. The highest viscosities are observed in the presence of giant wormlike surfactant micelles.…”

Section: Introductionmentioning

confidence: 99%

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Rheology of mixed solutions of sulfonated methyl esters and betaine in relation to the growth of giant micelles and shampoo applications

Yavrukova

Radulova

Danov

et al. 2020

Advances in Colloid and Interface Science

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This is a review article on the rheological properties of mixed solutions of sulfonated methyl esters (SME) and cocamidopropyl betaine (CAPB), which are related to the synergistic growth of giant micelles. Effects of additives, such as fatty alcohols, cocamide monoethanolamine (CMEA) and salt, which are expected to boost the growth of wormlike micelles, are studied. We report and systematize the most significant observed effects with an emphasis on the interpretation at molecular level and understanding the rheological behavior of these systems. The experiments show that the mixing of SME and CAPB produces a significant rise of viscosity, which is greater than in the mixed solutions of sodium dodecyl sulfate and CAPB. The addition of fatty alcohols, CMEA and cationic polymer, leads to broadening of the synergistic peak in viscosity without any pronounced effect on its height. The addition of NaCl leads to a typical salt curve with high maximum, but in the presence of dodecanol this maximum is much lower. At lower salt concentrations, the fatty alcohol acts as a thickener, whereas at higher salt concentrations -as a thinning agent. Depending on the shape of the frequency dependences of the measured storage and loss moduli, G' and G", the investigated micellar solutions behave as systems of standard or nonstandard rheological behavior. The systems with standard behavior obey the Maxwell viscoelastic model (at least) up to the crossover point (G' = G") and can be analyzed in terms of the Cates reptationreaction model. The systems with nonstandard rheological behavior obey the Maxwell model only in a restricted domain below the crossover frequency; they can be analyzed in the framework of an augmented version of the Maxwell model. The methodology for data analysis and interpretation could be applied to any other viscoelastic micellar system.

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Section: Systems With Standard Rheological Behavior: Numerical Resultsmentioning

confidence: 90%

Section: Systems With Standard Rheological Behavior: Numerical Resultsmentioning

confidence: 99%

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Rheology of mixed solutions of sulfonated methyl esters and betaine in relation to the growth of giant micelles and shampoo applications

Yavrukova

Radulova

Danov

et al. 2020

Advances in Colloid and Interface Science

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“…Another area where traditional WLMs are already present is consumer products for cleaning and personal care [46,47]. It is expected that smart micelles can advance the applicability of WLMs in cleaning processes, for instance in processes such as water treatment.…”

Section: Cleaning Processesmentioning

confidence: 99%

Applications of Smart Wormlike Micelles

Feng¹,

Chu

Dreiss

2015

SpringerBriefs in Molecular Science

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The end purpose of formulating smart wormlike micelles is undoubtedly to use them for practical applications. Their micellar structure and reversibly switchable viscoelastic properties offer opportunities for uses where controllable encapsulation and thickening are needed. A series of potential applications are described in this chapter, including biomedicine, cleaning, as electrorheological and photorheological fluids, for templating, and drag reduction, amongst others. However, the only current success stories of SWLMs commercial applications come from oil well stimulation processes, including as clean fracturing fluids and for self-diverting acidizing, which are discussed at length in this chapter.Keywords Applications of SWLMs · Oil well stimulation · Clean fracturing fluids · Self-diverting acidizing · Drag reduction · Biomedicine · Electrorheological fluids · Photo-rheological fluidsThe field of stimuli-responsive materials, in particular applied to hydrogels, has grown considerably over the past decade [1]. A plethora of "intelligent" nanostructured systems has emerged and been proposed for a wide range of applications, for instance, in electronic devices, as "smart" optical systems [2], micro-electromechanical systems, in coatings, and quite significantly in the biomedical field for drug delivery, diagnostics, bioseparation, as biosensors, and artificial organs and tissues [1][2][3]. Traditionally, these materials have been based predominantly on polymers; however, as previous chapters have shown, smart WLMs can display properties of "soft" gels, as a result of their entanglements [4][5][6][7]. Their micellar nature provides an opportunity for encapsulation and release, particularly relevant to the areas of drug delivery, the liberation of perfumes or to cleaning processes.Being still a very young field, applications of SWLMs as such are still largely speculative. While many of the advances discussed in this book respond to specific needs and are driven by a final use, they have not yet reached commercialization. Perhaps the only success stories of scale-up applications originate from the oil industry, where SWLMs have been extensively used in the various stages of the process,

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“…Upon the variation of solution's composition, peaks in viscosity are often observed [14][15][16][17][18][19], which can be explained with the formation of giant entangled wormlike micelles and their size and shape transformations [9,20,21,22]. The prediction and control of micelle growth and viscosity of formulations from concentrated surfactant solutions is an issue of primary importance for the personal-care and house-hold detergency [23][24][25][26], as well as in oilfield industry [27]. A comprehensive review on wormlike micelles can be found in our recent article, Ref.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of micelle growth. 1. Chain-conformation free energy of binary mixed spherical, wormlike and lamellar micelles

Danov

Kralchevsky

Stoyanov

et al. 2019

Journal of Colloid and Interface Science

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Hypotheses:A quantitative molecular-thermodynamic theory of the growth of giant wormlike micelles of nonionic surfactants can be developed on the basis of a generalized model, which includes the classical 'phase separation' and 'mass action' models as special cases. The generalized model describes spherocylindrical micelles, which are simultaneously multicomponent and polydisperse in size. Theory: By analytical minimization of the free-energy functional we derived explicit expressions for the chain-extension and chain-end distribution functions in the hydrocarbon core of mixed micelles from two surfactants of different chainlengths. Findings:The hydrocarbon core of a two-component micelle is divided in two regions, outer and inner, where the ends of the shorter and longer chains are located. The derived analytical expression for the chain-conformation free energy implies that the mixing of surfactants with different chainlengths is always nonideal and synergistic, i.e. it leads to decrease of the micellar free energy and to enhancement of micellization and micelle growth. The derived expressions are applicable to surfactants with different headgroups (nonionic, ionic, zwitterionic) and to micelles of different shapes (spherical, wormlike, lamellar). The results can be incorporated in a quantitative theory of the growth of giant mixed micelles in formulations with practical applications in detergency.

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Daily Applications of Systems with Wormlike Micelles

Cited by 6 publications

References 0 publications

Rheology of mixed solutions of sulfonated methyl esters and betaine in relation to the growth of giant micelles and shampoo applications

Rheology of mixed solutions of sulfonated methyl esters and betaine in relation to the growth of giant micelles and shampoo applications

Applications of Smart Wormlike Micelles

Analytical modeling of micelle growth. 1. Chain-conformation free energy of binary mixed spherical, wormlike and lamellar micelles

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