Effect of Additives on Surfactant Micelle Shape Transformation: Rheology and Molecular Dynamics Studies

Liu, Qi; Ji, Xiaoyu; Wang, Suxu; Zou, Wenjing; Li, Jing; Lv, Dongmei; Yin, Bo; Yan, Hui; Wei, Xilian

doi:10.1021/acs.jpcc.8b10495

Cited by 21 publications

(6 citation statements)

References 56 publications

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“…For instance, it is known that small amounts of the surfactant (or polymer) can reduce the friction losses in turbulent flows (the so-called “Toms effect” − however, the detailed mechanism has not yet been completely understood.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Janus Amphiphilic Wall on the Viscosity Behavior of Aqueous Surfactant Solutions

2020

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The effects of the chemical nature of an interface are one of the key parameters which can affect self-assembly and rheological behavior. To date, several studies have reported selfassembled structures and rheological behaviors in the development of various functional materials. In this study, we investigated the self-assembly and viscosity behavior of aqueous surfactant solutions confined in three types of Janus amphiphilic nanotubes (JANTs), which have two, four, and eight sequential domains, respectively, using molecular simulation. We found that the viscosity behavior depends on the surfactant concentration and the chemical nature of the wall surface. For instance, although the concentration levels of the surfactants are the same (c = 10%), completely different viscosity behaviors were observed in the two sequential domains (Newtonian-like) and the four and eight sequential domains (strong shear-thinning) of the JANTs. Our simulations demonstrated how the rheological properties of aqueous surfactant solutions, including viscosity and velocity profiles, can be controlled by the chemical nature of the JANT wall surface, effect of confinement, and their self-assembly structures. Considering the foregoing, we hope that our study offers new knowledge on nanofluid systems.

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Section: Introductionmentioning

confidence: 99%

Effect of the Janus Amphiphilic Wall on the Viscosity Behavior of Aqueous Surfactant Solutions

2020

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“…This also demonstrated the high sensitivity of the unique head groups of Di-C12-N2 to NaCl. The dissociated counter-ions greatly shielded the charges carried by the Di-C12-N2 head groups, 58 leading to reduced electrostatic interactions between molecules, and thus, facilitating aggregate growth. It is also observed from Fig.…”

Section: Resultsmentioning

confidence: 99%

Toroidal micelles formed in viscoelastic aqueous solutions of a double-tailed surfactant with two quaternary ammonium head groups

Lin,

Li,

Zhang

et al. 2024

Soft Matter

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“…Both the formation of wormlike micelles and how they are affected by nonpolar additives have been studied by molecular dynamics (MD) simulations − and theoretical tools − in the past. MD simulations provide structural information about the aggregates; however, their use in systematic studies is greatly hampered by the time and length scales involved in micellar aggregation.…”

Section: Introductionmentioning

confidence: 99%

Molecular Basis for the Morphological Transitions of Surfactant Wormlike Micelles Triggered by Encapsulated Nonpolar Molecules

2021

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Surfactant wormlike micelles are prone to experience morphological changes, including the transition to spherical micelles, upon the addition of nonpolar additives. These morphological transitions have profound implications in diverse technological areas, such as the oil and personal-care industries. In this work, additive-induced morphological transitions in wormlike micelles were studied using a molecular theory that predicts the equilibrium morphology and internal molecular organization of the micelles as a function of their composition and the molecular properties of their components. The model successfully captures the transition from wormlike to spherical micelles upon the addition of a nonpolar molecule. Moreover, the predicted effects of the concentration, molecular structure, and degree of hydrophobicity of the nonpolar additive on the wormlike-to-sphere transition are shown to be in good agreement with experimental trends in the literature. The theory predicts that the location of the additive in the micelle (core or hydrophobic–hydrophilic interface) depends on the additive hydrophobicity and content, and the morphology of the micelles. Based on the results of our model, simple molecular mechanisms were proposed to explain the morphological transitions of wormlike micelles upon the addition of nonpolar molecules of different polarities.

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Effect of Additives on Surfactant Micelle Shape Transformation: Rheology and Molecular Dynamics Studies

Cited by 21 publications

References 56 publications

Effect of the Janus Amphiphilic Wall on the Viscosity Behavior of Aqueous Surfactant Solutions

Effect of the Janus Amphiphilic Wall on the Viscosity Behavior of Aqueous Surfactant Solutions

Toroidal micelles formed in viscoelastic aqueous solutions of a double-tailed surfactant with two quaternary ammonium head groups

Molecular Basis for the Morphological Transitions of Surfactant Wormlike Micelles Triggered by Encapsulated Nonpolar Molecules

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