Electrostatic attraction between overall neutral surfaces

Adar, R; Andelman, David; Diamant, Haim

doi:10.1103/physreve.94.022803

Cited by 16 publications

(15 citation statements)

References 47 publications

(111 reference statements)

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“…In recent years considerable theoretical interest has emerged in the effective interaction between two heterogeneously charged walls (which typically are the surfaces * Electronic address: mussotter@is.mpg.de † Electronic address: bier@is.mpg.de of colloidal particles) mediated by an electrolyte solution [16][17][18][19][20][21][22][23][24][25][26]. In contrast to uniform substrates, this effective interaction can lead to lateral forces, in addition to the common ones in normal direction.…”

Section: Introductionmentioning

confidence: 99%

Electrolyte solutions at heterogeneously charged substrates

2018

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The influence of a chemically or electrically heterogeneous distribution of interaction sites at a planar substrate on the number density of an adjacent fluid is studied by means of classical density functional theory (DFT). In the case of electrolyte solutions the effect of this heterogeneity is particularly long ranged, because the corresponding relevant length scale is set by the Debye length which is large compared to molecular sizes. The DFT used here takes the solvent particles explicitly into account and thus captures phenomena, inter alia, due to ion-solvent coupling. The present approach provides closed analytic expressions describing the influence of chemically and electrically nonuniform walls. The analysis of isolated δ-like interactions, isolated interaction patches, and hexagonal periodic distributions of interaction sites reveals a sensitive dependence of the fluid density profiles on the type of the interaction, as well as on the size and the lateral distribution of the interaction sites.

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Section: Introductionmentioning

confidence: 99%

Electrolyte solutions at heterogeneously charged substrates

2018

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“…The disorder in the surface charge can be quenched [2] or annealed [3]. While the interaction between surfaces in the annealed case mainly involves polarization effects somewhat similar to van der Waals interactions, the quenched case is very sensitive to counterion release [4]. Some theoretical efforts were devoted to quenched systems involving multivalent counterions [5] for which strong and unexpected effects were described [6].…”

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confidence: 99%

Direct Measurement of Lateral Correlations under Controlled Nanoconfinement

et al. 2018

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Lateral correlations along hydrophobic surfaces whose separation can be varied continuously are measured by x-ray scattering using a modified surface force apparatus coupled with synchrotron radiation, named SFAX. A weak isotropic diffuse scattering along the equatorial plane is revealed for mica surfaces rendered hydrophobic and charge neutral by immersion in cationic surfactant solutions at low concentrations. The peak corresponds to a lateral surface correlation length ξ≈12 nm, without long-range order. These findings are compatible with the atomic force microscopy imaging of a single surface, where adsorbed surfactant stripes appear surrounded by bare mica zones. Remarkably, the scattering patterns remain stable for gap widths D larger than the lateral period but change in intensity and shape (to a lesser extent) as soon as D<ξ. This evolution codes for a redistribution of counterions (counterion release from antagonistic patches) and the associated new x-ray labeling of the patterns. The redistribution of counterions is also the key mechanism to the long-range electrostatic attraction between similar, overall charge-neutral walls, reported earlier.

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“…Furthermore, we lift the constraint of overall charge neutral walls, as has been used in Refs. [17,21,23,27]. The present study addresses the open questions from Ref.…”

Section: Introductionmentioning

confidence: 84%

“…Over the last years, an increasing interest in these surfaces has developed, leading to a number of studies investigating the influence of heterogeneously charged walls, for example on the effective interaction between two substrates in contact with an electrolyte solution [17][18][19][20][21][22][23][24][25][26][27]. These studies revealed the effective interaction in case of nonuniform substrates to cause lateral forces in addition to the ones in normal direction, which are commonly known.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous surface charge confining an electrolyte solution

Mußotter,

Bier,

Dietrich

2020

Preprint

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The structure of dilute electrolyte solutions close to a surface carrying a spatially inhomogeneous surface charge distribution is investigated by means of classical density functional theory (DFT) within the approach of fundamental measure theory (FMT). For electrolyte solutions the influence of these inhomogeneities is particularly strong because the corresponding characteristic length scale is the Debye length, which is large compared to molecular sizes. Here a fully three-dimensional investigation is performed, which accounts explicitly for the solvent particles, and thus provides insight into effects caused by ion-solvent coupling. The present study introduces a versatile framework to analyze a broad range of types of surface charge heterogeneities even beyond the linear response regime. This reveals a sensitive dependence of the number density profiles of the fluid components and of the electrostatic potential on the magnitude of the charge as well as on details of the surface charge patterns at small scales.

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Electrostatic attraction between overall neutral surfaces

Cited by 16 publications

References 47 publications

Electrolyte solutions at heterogeneously charged substrates

Electrolyte solutions at heterogeneously charged substrates

Direct Measurement of Lateral Correlations under Controlled Nanoconfinement

Heterogeneous surface charge confining an electrolyte solution

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