Micelles as model systems for equilibrium polyelectrolytes: a light and neutron scattering study

Sommer, Cornelia; Cannavacciuolo, Luigi; Egelhaaf, Stefan U.; Pedersen, Jan Skov; Schurtenberger, Peter

doi:10.1007/3-540-46545-6_66

Cited by 13 publications

(22 citation statements)

References 25 publications

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“…We thus proposed to use mixed ionic and nonionic surfactant systems as suitable models for “equilibrium polyelectrolytes”. , On the basis of the data analysis approach developed for the interpretation of scattering data from semiflexible micelles and polymers, the actual value of the measured Kuhn length can be determined with very high precision for a given system due to the strong scattering of the micelles. This results in data of remarkable accuracy even at low concentrations, as has been demonstrated recently with solutions of wormlike micelles of the nonionic surfactant C 16 E 6 , which can be “doped” by adding a small amount of ionic surfactant. , …”

Section: Introductionsupporting

confidence: 62%

“…We have recently extended the approach of using analogies to polymers for an understanding of surfactant systems to charged systems. , There exists at present a challenge for clarifying important questions about the effect of electrostatic interactions on the flexibility of polyelectrolytes. We thus proposed to use mixed ionic and nonionic surfactant systems as suitable models for “equilibrium polyelectrolytes”. , On the basis of the data analysis approach developed for the interpretation of scattering data from semiflexible micelles and polymers, the actual value of the measured Kuhn length can be determined with very high precision for a given system due to the strong scattering of the micelles.…”

Section: Introductionmentioning

confidence: 99%

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Wormlike Micelles as “Equilibrium Polyelectrolytes”: Light and Neutron Scattering Experiments

et al. 2002

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We demonstrate that aqueous solutions of giant polymer-like nonionic micelles “doped” with small amounts of ionic surfactants serve as ideal model systems for “equilibrium polyelectrolytes”. We report systematic light and neutron scattering investigations of the effect of ionic strength, doping level, and total concentration on the static properties of dilute and semidilute micellar solutions. In dilute solutions, we observe a dramatic influence of (intramicellar) electrostatic interactions on the micellar flexibility, and the results are in close agreement with Monte Carlo simulations. We also analyze the effect of electrostatic contributions to intermicellar interactions and micellar growth. In the semidilute regime, strong long-range interactions between micelles occur at low ionic strength and induce liquidlike ordering, and the resulting structure factor peak exhibits the same concentration dependence as previously observed for polyelectrolytes.

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Wormlike Micelles as “Equilibrium Polyelectrolytes”: Light and Neutron Scattering Experiments

et al. 2002

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“…We note that if all monomers of DNA were charged, one obtains B 29 and the range of these experimentally realizable B values are similar to the ones considered in this study. Another system with a comparably high linear charge densities is solution of charged worm-like micelles [47][48][49] . We hope that experimentalists find it interesting to check the existence of different collapse regimes for different counterion valencies and sizes.…”

Section: Discussionmentioning

confidence: 99%

Regimes of electrostatic collapse of a highly charged polyelectrolyte in a poor solvent

et al. 2017

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We perform extensive molecular dynamics simulations of a highly charged, collapsed, flexible polyelectrolyte chain in a poor solvent for the case when the electrostatic interactions, characterized by the reduced Bjerrum length B , are strong. We find the existence of several sub-regimes in the dependence of the gyration radius of the chain R g on B characterized by R g ∼ −γ B . In contrast to a good solvent, the exponent γ for a poor solvent crucially depends on the size and valency of counterions. To explain the different sub-regimes, we generalize the existing counterion fluctuation theory by including a more complete account of all possible volume interactions in the free energy of the polyelectrolyte chain. We also show that the presence of the condensed counterions modifies the effective attraction among the chain monomers and modulates the sign of the second virial coefficient in poor solvent conditions.

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“…It is thus of particular interest to consider systems where the charge can be tuned, and even made to vanish, a limit where L tot and L 0 coincide. This is the case of the doped giant micelles studied in [9,66]. The comparison in Fig.…”

mentioning

confidence: 89%

Bending stiff charged polymers: The electrostatic persistence length

Trizac¹,

Shen²

2016

EPL

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Many charged polymers, including nucleic acids, are locally stiff. Their bending rigidity -quantified by the persistence length -, depends crucially on Coulombic features, such as the ionic strength of the solution which offers a convenient experimental route for tuning the rigidity. While the classic Odijk-Skolnick-Fixman treatment fails for realistic parameter values, we derive a simple analytical formula for the electrostatic persistence length. It is shown to be in remarkable agreement with numerically obtained Poisson-Boltzmann theory results, thereby fully accounting for non-linearities, among which counter-ion condensation effects. Specified to double-stranded DNA, our work reveals that the widely used bare persistence length of 500Å is overestimated by some 20%.

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Micelles as model systems for equilibrium polyelectrolytes: a light and neutron scattering study

Cited by 13 publications

References 25 publications

Wormlike Micelles as “Equilibrium Polyelectrolytes”: Light and Neutron Scattering Experiments

Wormlike Micelles as “Equilibrium Polyelectrolytes”: Light and Neutron Scattering Experiments

Regimes of electrostatic collapse of a highly charged polyelectrolyte in a poor solvent

Bending stiff charged polymers: The electrostatic persistence length

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