Universal reduction of pressure between charged surfaces by long-wavelength surface charge modulation

Lukatsky, D. B.; Safran, S. A.

doi:10.1209/epl/i2002-00264-2

Cited by 37 publications

(46 citation statements)

References 23 publications

(50 reference statements)

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“…For the case of two discretely charged surfaces of the same sign, most of the counterions crowd near the surfaces and the attraction between the surfaces is stronger compared to the case of uniformly charged surfaces [19]. The same differences have also been observed in the weak coupling limit [23,24].…”

Section: Introductionmentioning

confidence: 56%

Distribution of counterions and interaction between two similarly charged dielectric slabs: Roles of charge discreteness and dielectric inhomogeneity

et al. 2012

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The distribution of counterions and the electrostatic interaction between two similarly charged dielectric slabs is studied in the strong coupling limit. Dielectric inhomogeneities and discreteness of charge on the slabs have been taken into account. It is found that the amount of dielectric constant difference between the slabs and the environment, and the discreteness of charge on the slabs have opposing effects on the equilibrium distribution of the counterions. At small inter-slab separations, increasing the amount of dielectric constant difference increases the tendency of the counterions toward the middle of the intersurface space between the slabs and the discreteness of charge pushes them to the surfaces of the slabs. In the limit of point charges, independent of the strength of dielectric inhomogeneity, counterions distribute near the surfaces of the slabs. The interaction between the slabs is attractive at low temperatures and its strength increases with the dielectric constant difference. At room temperature, the slabs may completely attract each other, reach to an equilibrium separation or have two equilibrium separations with a barrier in between, depending on the system parameters.

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Section: Introductionmentioning

confidence: 56%

Distribution of counterions and interaction between two similarly charged dielectric slabs: Roles of charge discreteness and dielectric inhomogeneity

et al. 2012

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“…Collapse of counterions and surface ions is prevented by a truncated Lennard-Jones term acting between all particles. The model we consider includes the combined effects of discrete surface charges, surface corrugations, and counterion excluded volume [123], which are all neglected in the classical mean-field approaches but have been considered quite recently [54,124,125,91,126,127,128,129,130,131,132,133]. We employ Browniandynamics simulations where the velocity of all particles follows from the position Langevin equation.…”

Section: Charged Structured Surfacesmentioning

confidence: 99%

Statics and dynamics of strongly charged soft matter

Boroudjerdi¹,

Kim²,

Naji³

et al. 2005

Physics Reports

343

523

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Soft matter materials, such as polymers, membranes, proteins, are often electrically charged. This makes them water soluble, which is of great importance in technological application and a prerequisite for biological function. We discuss a few static and dynamic systems that are dominated by charge effects. One class comprises complexation between oppositely charged objects, for example the adsorption of charged ions or charged polymers on oppositely charged substrates of different geometry. Here the main questions are whether adsorption occurs and what the effective charge of the resulting complex is. We explicitly discuss the adsorption behavior of polyelectrolytes on substrates of planar, cylindrical and spherical geometry with specific reference to DNA adsorption on supported charged lipid layers, DNA adsorption on oppositely charged cylindrical dendro-polymers, and DNA binding on globular histone proteins, respectively. In all these systems salt plays an important role, and some of the important features can already be obtained on the linear Debye-Hückel level. The second class comprises effective interactions between similarly charged objects. Here the main theme is to understand the experimental finding that similarly and highly charged bodies attract each other in the presence of multi-valent counterions. This is demonstrated using field-theoretic arguments as well as Monte-Carlo simulations for the case of two homogeneously charged bodies. Realistic surfaces, on the other hand, are corrugated and also exhibit modulated charge distributions, which is important for static properties such as the counterion-density distribution, but has even more pronounced consequences for dynamic properties such as the counterion mobility. More pronounced dynamic effects are obtained with highly condensed charged systems in strong electric fields. Likewise, an electrostatically collapsed highly charged polymer is unfolded and oriented in strong electric fields. All charged systems occur in water, and water by itself is not a very well understood material. At the end of this review, we give a very brief and incomplete account of the behavior of water at planar surfaces. The coupling between water structure and charge effects is largely unexplored, and a few directions for future research are sketched. On an even more nanoscopic level, we demonstrate using ab-initio methods that specific interactions between oppositely charged groups (which occur when their electron orbitals start to overlap) are important and cause ion-specific effects that have recently moved into the focus of interest.

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“…This has been a recurrent topic in the statistical mechanics of interfaces. Already in the 1970s, Nelson [29][30][31][32] have revisited the problem, finding that discrete charges add to relatively minor corrections to an approximation where the interface is treated as a smooth background. The crucial aspect between the interaction of interfacial charges and ions is that it describes a strong correlation 20 ͑see also Ref.…”

Section: The Journal Of Chemical Physics 131 185102 ͑2009͒mentioning

confidence: 99%

Electrostatic correlations at the Stern layer: Physics or chemistry?

Travesset

Vangaveti

2009

The Journal of Chemical Physics

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We introduce a minimal free energy describing the interaction of charged groups and counterions including both classical electrostatic and specific interactions. The predictions of the model are compared against the standard model for describing ions next to charged interfaces, consisting of Poisson-Boltzmann theory with additional constants describing ion binding, which are specific to the counterion and the interfacial charge ("chemical binding"). It is shown that the "chemical" model can be appropriately described by an underlying "physical" model over several decades in concentration, but the extracted binding constants are not uniquely defined, as they differ depending on the particular observable quantity being studied. It is also shown that electrostatic correlations for divalent (or higher valence) ions enhance the surface charge by increasing deprotonation, an effect not properly accounted within chemical models. The charged phospholipid phosphatidylserine is analyzed as a concrete example with good agreement with experimental results. We conclude with a detailed discussion on the limitations of chemical or physical models for describing the rich phenomenology of charged interfaces in aqueous media and its relevance to different systems with a particular emphasis on phospholipids. Keywords Equilibrium constants, Free energy, Electrostatics, Statistical mechanics models, Protons Disciplines Bioinformatics | Biological and Chemical Physics CommentsThe following article appeared in J. Chem. Phys. 131, 185102 (2009) We introduce a minimal free energy describing the interaction of charged groups and counterions including both classical electrostatic and specific interactions. The predictions of the model are compared against the standard model for describing ions next to charged interfaces, consisting of Poisson-Boltzmann theory with additional constants describing ion binding, which are specific to the counterion and the interfacial charge ͑"chemical binding"͒. It is shown that the "chemical" model can be appropriately described by an underlying "physical" model over several decades in concentration, but the extracted binding constants are not uniquely defined, as they differ depending on the particular observable quantity being studied. It is also shown that electrostatic correlations for divalent ͑or higher valence͒ ions enhance the surface charge by increasing deprotonation, an effect not properly accounted within chemical models. The charged phospholipid phosphatidylserine is analyzed as a concrete example with good agreement with experimental results. We conclude with a detailed discussion on the limitations of chemical or physical models for describing the rich phenomenology of charged interfaces in aqueous media and its relevance to different systems with a particular emphasis on phospholipids.

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Universal reduction of pressure between charged surfaces by long-wavelength surface charge modulation

Cited by 37 publications

References 23 publications

Distribution of counterions and interaction between two similarly charged dielectric slabs: Roles of charge discreteness and dielectric inhomogeneity

Distribution of counterions and interaction between two similarly charged dielectric slabs: Roles of charge discreteness and dielectric inhomogeneity

Statics and dynamics of strongly charged soft matter

Electrostatic correlations at the Stern layer: Physics or chemistry?

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